INTERNATIONAL
STANDARD

ISO
683-2
Second edition
2016-07-01

Heat-treatable steels, alloy steels and
free-cutting steels —

Part 2:

Alloy steels for quenching and
tempering
Aciers pour traitement thermique, aciers alliés et aciers pour
décolletage —
Partie 2: Aciers alliés pour trempe et revenu

Reference number
ISO 683-2:2016(E)
© ISO 2016


ISO 683-2:2016(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, Published in Switzerland

All rights reserved. Unless otherwise specified, no part o f this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior

written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country o f

the requester.

ISO copyright o ffice

Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47

www.iso.org

ii

© ISO 2016 – All rights reserved


ISO 683-2:2016(E)

Page

Contents

Foreword .......................................................................................................................................................................................................................................... v
1
2

3
4


Scope ................................................................................................................................................................................................................................. 1
Normative references ...................................................................................................................................................................................... 1

Terms and definitions ..................................................................................................................................................................................... 2
Classification and designation ............................................................................................................................................................... 3
4. 1

4.2
5

6

7

............................................................................................................................................................................................. 3
Designation ................................................................................................................................................................................................ 3
C las s ificatio n

Information to be supplied by the purchaser......................................................................................................................... 3

................................................................................................................................................................... 3
.................................................................................. 3
5.3 Ordering example ................................................................................................................................................................................. 4
Manufacturing process .................................................................................................................................................................................. 4
6.1 General ........................................................................................................................................................................................................... 4
6.2 Deoxidation ................................................................................................................................................................................................ 4
f
......................................................................... 4
6.3.1 Heat-treatment condition ........................................................................................................................................ 4

6.3.2 Particular surface conditions ................................................................................................................................ 4
f
..................................................................................................................................................................... 4
Requirements .......................................................................................................................................................................................................... 5
............................................................. 5
7.1.1 General...................................................................................................................................................................................... 5
7.1.2 Chemical composition ................................................................................................................................................. 5
7.1.3 Mechanical properties ................................................................................................................................................ 5
...................................................................................................................................................................... 5
7.1.5 Surface hardness .............................................................................................................................................................. 5
............................................................................................................................................................................................ 5
.................................................................................................................................................................................... 5
7.4 Grain size ...................................................................................................................................................................................................... 6
7.5 Non-metallic inclusions ................................................................................................................................................................... 6
7.5.1 Microscopic inclusions ............................................................................................................................................... 6
7.5.2 Macroscopic inclusions .............................................................................................................................................. 6
7.6 Internal soundness .............................................................................................................................................................................. 6
f
......................................................................................................................................................................................... 6
7.8 Decarburization ..................................................................................................................................................................................... 7
7.9 Shape, dimensions and tolerances ......................................................................................................................................... 7
Inspection .................................................................................................................................................................................................................... 7
f
................................................................................................................ 7
f
........................................................................................................................................................................... 7
.................................................................................................................................................. 8
f
.......................... 8
8.3.2 Visual and dimensional inspection .................................................................................................................. 8

Test methods ............................................................................................................................................................................................................. 8
.................................................................................................................................................................................. 8
9.2 Mechanical tests ..................................................................................................................................................................................... 8
9.2.1 Tensile test ............................................................................................................................................................................ 8
9.2.2 Impact test............................................................................................................................................................................. 8
........................................................................................................................................... 8
9.3.1 Hardness in treatment conditions +A and +S ......................................................................................... 8
f
.................................................................................................................................. 9
9.3.3 Surface hardness .............................................................................................................................................................. 9
9.4 Retests ............................................................................................................................................................................................................ 9
5 .1

M andato ry in fo rmatio n

5 .2

O p tio ns and/o r s up p lementary o r s p ecial requirements

6.3

H eat- treatment co nditio n and s ur ace co nditio n at delivery

6.4

Traceab ility o

7.1

C hemical co mp o s itio n, mechanical p ro p erties and hardenab ility


7.1 .4

8

H ardenab ility

7.2

M achinab ility

7.3

C o ld s hearab ility

7.7

S ur ace quality

8.1

Tes ting p ro cedures and typ es o

8.2

Frequency o

8.3

S p ecific ins p ectio n and tes ting

8.3 .1

9

the cas t

do cuments

tes ting

Verificatio n o

the hardenab ility, hardnes s and mechanical p ro p erties

9.1

C hemical analys is

9.3

H ardnes s and hardenab ility tes ts

9.3 .2

Verificatio n o

© ISO 2016 – All rights reserved

hardenab ility


iii


ISO 683-2:2016(E)

10

Marking .......................................................................................................................................................................................................................... 9

(normative) Ruling sections for mechanical properties ....................................................................................... 31
Annex B (normative) Supplementary or special requirements ............................................................................................ 35
Annex C (informative) Designation of steels given in this part of ISO 683 and of comparable

Annex A

grades covered in various designation systems ................................................................................................................ 37

(informative)

Annex D
Dimensional standards applicable to products complying with this
part of ISO 683 ..................................................................................................................................................................................................... 39
Bibliography ............................................................................................................................................................................................................................. 40

iv

© ISO 2016 – All rights reserved


ISO 683-2:2016(E)


Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work o f preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters o f
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
di fferent types o f ISO documents should be noted. This document was dra fted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some o f the elements o f this document may be the subject o f
patent rights. ISO shall not be held responsible for identi fying any or all such patent rights. Details o f
any patent rights identified during the development o f the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is in formation given for the convenience o f users and does not

constitute an endorsement.

For an explanation on the meaning o f ISO specific terms and expressions related to con formity assessment,

as well as information about ISO’s adherence to the World Trade Organization (WTO) principles in the

Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.
The committee responsible for this document is ISO/TC 17, Steel, Subcommittee SC 4, Heat treatable and
alloy steels.
This second edition cancels and replaces the first edition (ISO 683-2:2012), o f which it constitutes a

minor revision.
ISO 683 consists of the following parts, under the general title Heat-treatable steels, alloy steels and freecutting steels:
— Part 1: Non-alloy steels for quenching and tempering
— Part 2: Alloy steels for quenching and tempering
— Part 3: Case-hardening steels
— Part 4: Free-cutting steels
— Part 5: Nitriding steels
— Part 14: Hot-rolled steels for quenched and tempered springs
— Part 15: Valve steels for internal combustion engines
— Part 17: Ball and roller bearing steels
— Part 18: Bright steel products

© ISO 2016 – All rights reserved

v



INTERNATIONAL STANDARD

ISO 683-2:2016(E)

Heat-treatable steels, alloy steels and free-cutting steels —

Part 2:


Alloy steels for quenching and tempering
1 Scope
T h i s p a r t o f I S O 6 8 3 s p e ci fie s the te ch n ic a l del iver y re qu i rements

—

s em i-fi ni s he d pro duc ts , ho t

forme d,

for

e . g. blo om s , bi l le ts , s lab s (s e e No te 1) ,

— bars (see Note 1),
— wire rod,
—

fi n i she d fl at pro duc ts , a nd

— hammer or drop forgings (see Note 1)
manu fac tu re d

from

the d i re c t h arden i ng a l loy s te el s a nd the a l loy flame - and i nduc tion-ha rden i ng

f
f

ff
steels listed in Table 3
of products in Table 1 and in one of the surface conditions given in Table 2.
The steels are, in general, intended for the manufacture of quenched and tempered or austempered
(see 3.2
Tables 8 and 9).
The requirements for mechanical properties given in this part of ISO 683 are restricted to the sizes
given in the relevant Table 8.
and s uppl ie d i n one o

the he at-tre atment cond ition s given

or the d i

erent typ e s

and No te 2 ) and flame - or i nduc tion-h ardene d mach i ne p ar ts (s e e

NO TE 1

H a m mer- forge d

s em i-fi n i s he d

h a m mer- forge d b a rs a re i n the

“hammer and drop forgings”.

fol lowi n g


pro duc ts

( b lo om s ,

bi l le ts ,

s l ab s ,

e tc .) ,

s e a m le s s

ro l le d

r i ngs

a nd

co vere d u nder s em i-fi n i s he d p ro duc ts or b a rs a nd no t u nder the ter m

NO TE 2

Fo r the p u r p o s e s o f s i mp l i fic atio n , the ter m “quenche d a nd temp ere d” i s , u n le s s o ther wi s e i nd ic ate d ,

NO TE 3

Fo r I nter n atio n a l S ta nd a rd s

used in the following also for the austempered condition.
rel ati n g to


s te el s

compl yi ng with the re qu i rements

fo r

the chem ic a l

composition in Table 3, however, supplied in other product forms or treatment conditions than given above or

i ntende d

NO TE 4

fo r

s p e c i a l ap p l ic atio n s , a nd

fo r

o ther rel ate d I ntern ation a l S ta nda rd s , s e e the B ib l io grap hy.

T h i s p a r t o f I S O 6 8 3 do e s no t app l y to b r ight p ro duc ts a nd b a rs a nd wi re ro d

such products, see ISO 683-18 and ISO 4954.

for

cold he ad i ng. For


I n s p e c i a l c a s e s , va ri ation s i n the s e te ch n ic a l del iver y re qui rements or add ition s to them c an
s ubj e c t o f an agre ement at the ti me o f enqui r y and order (s e e

5.2 and Annex B).

form

the

I n add ition to th i s p ar t o f I S O 6 8 3 , the genera l te ch n ic a l del iver y re qu i rements o f I S O 4 0 4 are appl ic able .

2 Normative references
T he

fol lowi ng

i nd i s p en s able

do c u ments , i n whole or i n p ar t, are normatively re ference d i n th i s do c u ment a nd are

for

its

appl ic ation .

For date d re ference s ,

on ly the


e d ition

cite d appl ie s .

For u ndate d

re ference s , the late s t e d ition o f the re ference d do c u ment (i nclud i ng any amend ments) appl ie s .

ISO 148-1, Metallic materials — Charpy pendulum impact test — Part 1: Test method
© ISO 2016 – All rights reserved

1


ISO 683-2:2016(E)

ISO 377, Steel and steel products — Location and preparation ofsamples and test pieces for mechanical testing
ISO 404:2013, Steel and steel products — General technical delivery requirements
ISO 642, Steel — Hardenability test by end quenching (Jominy test)
ISO 643, Steels — Micrographic determination of the apparent grain size
ISO 3887, Steels — Determination of depth of decarburization
ISO 4885:—1) , Ferrous products — Heat treatments — Vocabulary
ISO 4948-1, Steels  —  Classification  —  Part  1:  Classification  of  steels  into  unalloyed  and  alloy  steels  based 
on chemical composition

ISO 4948-2, Steels  —  Classification  —  Part  2:  Classification  of  unalloyed  and  alloy  steels  according  to  main 
quality classes and main property or application characteristics

ISO/TS 4949, Steel names based on letter symbols

ISO 4967, Steel — Determination of content of non-metallic inclusions — Micrographic method using
standard diagrams

ISO 6506-1, Metallic materials — Brinell hardness test — Part 1: Test method
ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1: Test method (scales A, B, C, D, E, F, G, H,

K, N, T)

ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
ISO 6929, Steel products — Vocabulary
ISO 7788, Steel  —  Surface  finish  of  hot-rolled  plates  and  wide  flats  —  Delivery  requirements
ISO 9443, Heat-treatable and alloy steels — Surface quality classes for hot-rolled round bars and wire

rods — Technical delivery conditions

ISO 10474, Steel and steel products — Inspection documents
ISO 14284, Steel and iron — Sampling and preparation of samples for the determination of chemical

composition

3 Terms and definitions
For the

pu rp o s e s

o f th i s

do c ument,

I S O 69 2 9, I S O 142 8 4, a nd the


NO TE

Fo r de vi atio n s

from

the

fol lowi ng

defi n ition s

in I SO

3 7 7,

ISO

48 85 ,

ISO

49 4 8 -1 ,

ISO

49 4 8 -2 ,

apply.


the s e ter m s a nd de fi n ition s , s e e N o te s 1 a nd 2 o f

Clause 1.

3.1
ruling section
s e c tion

for

wh ich the s p e ci fie d me ch an ic a l prop er tie s s ha l l apply

N o te 1 to entr y: I ndep endent o f the ac tu a l s h ap e a nd d i men s io n s o f the c ro s s - s e c tio n o f the pro duc t, the s i z e o f its
r u l i n g s e c tio n i s a l ways given b y a d i a me ter. T h i s cor re s p ond s to the d ia me ter o f a n “e qu iva lent rou nd b a r ”. T h at

is a round bar which will show the same cooling rate as the actual ruling section of the product concerned at its
position for taking the test pieces, when being cooled from austenitizing temperature.

1) Under preparation. Stage at the time of publication: ISO/DIS 4885:2016.
2

© ISO 2016 – All rights reserved


ISO 683-2:2016(E)

3.2
austempering


isothermal heat treatment for producing bainitic or ausferritic structure of a work piece
Note 1 to entry: The final cooling to ambient temperature is not at a specific rate.
[SOURCE: ISO 4885:—2) , 3.11]
3.3
alloy steel

as defined in ISO 4948-1:1982, 3.1.3
4

4



.

C

1



l

a

C

s

l


s

a

i

s

f
i

s

i

c

f
i

a

c

t
i

a


o

t
i

n

o



a

n

d



d

e

s

i

g

n


a

t
i

o

n

n

The classification o f the relevant steel grades is according to ISO 4948-1 and ISO 4948-2. All steel grades
covered by this part o f ISO 683 are alloy special steels.
4.2

Designation

For the steel grades covered by this part o f ISO 683, the steel names as given in the relevant tables are

allocated in accordance with ISO/TS 4949.
5
5.1

Information to be supplied by the purchaser
Mandatory information

The manu facturer shall obtain the following in formation from the purchaser at the time o f enquiry

and order:


a) quantity to be delivered;
b) designation o f the product form (slab, bloom, billet, round bar, wire rod, wide flat, sheet, plate, strip,
forging, etc.);

c) either the designation of the dimensional standard and the dimensions and tolerances selected
from this (see 7.9) or, for example in the case of drop forgings, the designation of the drawing or any
other document covering the dimensions and tolerances required for the product;

d) re ference to this part o f ISO 683, i.e. ISO 683-2;

e) the designation of the steel grade given in Table 3 ;
f

) the symbol for the required heat-treatment condition (see Table 1 , column 2);

g) standard designation for a test report 2.2 or, i f required any other type o f inspection document in

accordance with ISO 10474 or according to another regional standard, e.g. EN 10204 or JIS G 0415.

5.2

Options and/or supplementary or special requirements

Several options are specified in this part o f ISO 683 and listed below. I f the purchaser does not indicate
any o f these options, the products will be supplied in accordance with the basic specifications o f this

part of ISO 683 (see 5.1):

a) i f another sur face condition than “hot worked” or a special sur face quality is required, the sur face

condition (see Table 2 ) and the sur face quality (see 7.7 );

2) Under preparation. Stage at the time of publication: ISO/DIS 4885:2016.
© ISO 2016 – All rights reserved

3


ISO 683-2:2016(E)
b) any requirement for the hardenability (+H, +HH, +HL) for special steels (see 7.1.4 and Tables 5 to 7 );
c) any supplementary requirement that shall be complied with, the symbol and, where necessary, the
details o f this supplementary requirement (see Annex B );
d) any requirement for the verification o f non-metallic inclusion content (see 7.5 );

e) verification o f hardenability and, i f agreed, the in formation about calculation o f the hardenability
(see 9.3.2 );
f

) any requirement regarding the permissible depth o f decarburization (see 7.8 );

g) suitability o f bars and rod for bright drawing (see 7.7.4);

h) any requirement relating to the removal o f sur face de fects (see 7.7.5).

5.3 Ordering example
EXAMPLE

Fi fty hot-rolled round bars according to ISO 1035-1 with a nominal diameter o f 40 mm and a

nominal length of 8 000 mm with diameter tolerance according to class S and with length tolerance according to

class L2 of ISO 1035-4 made of steel grade ISO 683-2, 42CrMo4 (see Table 3) in the heat-treatment condition +S
(see Table 1), surface blast cleaned (+BC) (see Table 2 ), product analysis/option B.4 with an inspection certificate
3.1 according to ISO 10474:
50 round bars ISO 1035 – 40,0S × 8 000L2
ISO 683-2 – 42CrMo4+S +BC option B.4
ISO 10474 – 3.1

6 Manufacturing process
6.1 General
The manu facturing process o f the steel and o f the products is, with the restrictions given by the

requirements in 6.2 to 6.4, left to the discretion of the manufacturer.
For minimum reduction ratio or minimum thickness deformation ratio of rolled and forged products,
see B.5.
6.2 Deoxidation

All steels shall be deoxidized.
6.3 Heat-treatment condition and surface condition at delivery
6.3.1 Heat-treatment condition

The products shall be delivered in one of the heat-treatment conditions given in Table 1, lines 2 to 6 as
agreed during time o f enquiry and order.

6.3.2 Particular surface conditions
I f so agreed at the time o f enquiry and order, the products shall be delivered in one o f the particular

surface conditions given in Table 2, lines 3 to 6.
6.4 Traceability of the cast

Each product shall be traceable to the cast (see Clause 10).

4

© ISO 2016 – All rights reserved


ISO 683-2:2016(E)

7 Requirements
7.1 Chemical composition, mechanical properties and hardenability
7.1.1 General

Table 1

shows the combinations o f usual heat-treatment conditions at delivery, product forms and
requirements, as specified in Tables 3 to 9.

Except where steels are ordered in the quenched and tempered condition, this part of ISO 683 makes
for the alloyed steels provisions to be supplied with or without hardenability requirements (see Table 1,
columns 8 and 9).
7.1.2 Chemical composition
The chemical composition determined by cast analysis shall comply with the values in Table 3.
Permissible deviations between the limiting values for cast analysis and the values for product analysis

are given in Table 4.

The product analysis shall be carried out when specified at the time o f the enquiry and order (see B.4).

7.1.3 Mechanical properties
Where the steel is ordered without hardenability requirements, the requirements for mechanical
properties specified in Tables 7 or 8 apply as appropriate for the particular heat treatment condition.


In this case, the hardenability values given in Table 5 are for guidance purposes only.

Table 8 apply to test pieces in the quenched and tempered
condition, which have been taken and prepared in accordance with Figure 2 or Figures 3 and 4 (see also
footnote a to Table 1).
The mechanical property values given in

7.1.4 Hardenability

Where the steel is ordered using the designations given in Table 5 or 6 to normal (see Table 5) or to
narrowed (see Table 6) hardenability requirements, the values of hardenability given in Table 5 or 6,
respectively apply in addition to the requirements cited in Table 1, columns 9.1 and 9.2. (see footnote b
to Table 3).
7.1.5 Surface hardness
For the sur face hardness o f alloy steels a fter flame or induction hardening, the specifications in
Table 9 apply.

7.2 Machinability
All steels are machinable in the condition “so ft annealed”. Where improved machinability is required,
grades with a specified sul fur range and/or with a specific treatment should be ordered to improve
machinability (see also Table 1, line 6).

7.3 Cold shearability
7.3.1 Under suitable shearing conditions (avoiding local stress peaks, preheating, application of blades
with a profile adapted to that o f the product, etc.) all steels are cold shearable in the so ft annealed (+A)

condition.

© ISO 2016 – All rights reserved


5


ISO 683-2:2016(E)

Steel grades 34Cr4, 37Cr4, 41Cr4, 25CrMo4, 34CrMo4, 42CrMo4 and 41CrNiMo2 with maximum
corresponding +H, +HH and +HL grades (see Tables 3 and 5 to 7) are, under suitable conditions, also cold
shearable when being delivered in the condition “treated to improve shearability (+S)” with the hardness
requirements given in Table 7.
7.3.2

and specified range S-content, boron-alloy steel grades 33MnCrB5-2 and 39MnCrB6-2 and the

Under suitable conditions, steel grades 20MnB5, 30MnB5, 39MnB5 and 27MnCrB5-2, and
are cold shearable in the
untreated condition.
7.3.3

the corresponding grades with requirements on hardenability (see Table 5),
7.4 Grain size

All steels shall have a fine grain structure with an austenite grain size o f 5 or finer when tested in
accordance with ISO 643. For verification, see B.2.
7.5
7.5.1

Non-metallic inclusions
Microscopic inclusions


The special steels shall have a certain degree o f cleanness; however, verification o f the non-metallic
inclusion content requires a special agreement. I f there is such an agreement at the time o f enquiry

and order, the microscopic non-metallic inclusion content shall be determined to an agreed procedure
and within agreed limits in accordance with ISO 4967 or another standard, e.g. regional standards
EN 10247 or JIS G 0555.
For grades with specified minimum sul fur content, the agreement should not include sulfides.
7.5.2

Macroscopic inclusions

This requirement is applicable to the verification o f the macroscopic inclusions in special steels. I f
verification is agreed, the method and acceptance limits shall be agreed at the time o f enquiry and order.
7.6 Internal soundness

Where appropriate, requirements relating to the internal soundness of the products shall be agreed at
the time o f enquiry and order (see B.3).
7.7

Surface quality

7.7.1

All products shall have a smooth surface finish appropriate to the manu facturing process applied.

7.7.2

Minor surface imperfections, which may occur also under normal manu facturing conditions,

7.7.3


Bars and wire rod shall be delivered with surface class 1za2 according to ISO 9443 and hot-rolled

such as prints originating from rolled-in scale, are not to be regarded as defects.

plates and wide flats are delivered with a surface according ISO 7788 unless otherwise agreed at the time
o f enquiry and order.
Where no International Standard on the sur face quality o f steel products exists, detailed requirements
re ferring to this characteristic shall, where appropriate, be agreed at the time o f enquiry and order.

It is more di fficult to detect and eliminate sur face discontinuities from coiled products than from cut
lengths. This should be taken into account when agreements on sur face quality are made.
I f suitability o f bars and rod for bright drawing is required, this shall be agreed at the time o f
enquiry and order.

7.7.4

6

© ISO 2016 – All rights reserved


ISO 683-2:2016(E)

7.7.5

The removal o f s ur face de fects by welding s hall o nly b e p ermitted with the ap p roval o f the

customer or his/her representative.
If surface discontinuities are repaired, the method and maximum depth of removal shall be agreed at


the ti me o f enqui r y and order.

7.8 Decarburization
Re qu i rements relati ng to the p erm i s s ible dep th o f de c arbu ri z ation may b e agre e d at the ti me o f enqu i r y

and order.
The depth of decarburization shall be determined in accordance with the micrographic method
s p e ci fie d i n I S O 3 8 8 7.

7.9

Shape, dimensions and tolerances

T he s hap e, d i men s ion s a nd tolerance s o f the pro duc ts sh a l l comply with the re qu i rements agre e d at
the ti me o f enqu i r y a nd order. T he agre ements s ha l l, as

International Standards (see Annex D

far

as p o s s ible, b e b as e d on corre s p ond i ng

) ; o ther wi s e on s uitable nationa l s tandard s .

8 Inspection
8.1

Testing procedures and types of documents


8.1.1

Pro ducts co mp lying with this p art o f I S O 6 8 3 s hall b e o rdered and delivered with o ne o f the

ins p ectio n do cuments as s p ecified in I S O 1 0 47 4 o r ano ther s tandard, e. g. regio nal s tandards E N 1 0 2 0 4
o r J I S G 0 41 5 . The typ e o f do cument s hall b e agreed up o n at the time o f enquiry and o rder. I f the o rder
do es no t co ntain any s p ecificatio n o f this typ e, a tes t rep o rt 2 . 2 s hall b e is s ued.

8.1.2

I f, in acco rdance with the agreements made at the time o f enquiry and o rder, a tes t rep o rt 2 . 2 is

to be provided, this shall cover the following information:
a)

con fi rmation that the materi a l compl ie s with the re qu i rements o f the order;

b)

re s u lts o f the c a s t a na lys i s

8.1.3

for

a l l elements s p e ci fie d i n

Table 3 for the steel grade concerned.

I f, in acco rdance with the agreements in the o rder, an ins p ectio n certificate 3 . 1 o r 3 . 2 , is to b e


p rovided, the s p ecific ins p ectio ns and tes ts des crib ed in

8.3 and Clause 9 shall be carried out and the

res ults s hall b e co nfirmed in the ins p ectio n certificate.

I n add ition, the i n s p e c tion cer ti fic ate s ha l l cover:

a)

con fi rmation that the materi a l compl ie s with the re qu i rements o f the order;

b)

re s u lts o f the c a s t a na lys i s

c)

re s u lts o f a l l i n s p e c tion s and te s ts ordere d b y s upplementa r y re qu i rements (s e e

d)

the s ymb o l , le tters o r nu mb ers rel ati ng the i n s p e c tio n cer ti fic ate , te s t p ie ce s a nd p ro duc ts to

8.2

for

a l l elements s p e ci fie d i n


Table 3 f

or the s te el grade concerne d;

Annex B

);

each other.

Frequency of testing

T he amou nt o f te s ti ng , the s a mp l i ng cond ition s and the te s t me tho d s to b e appl ie d

the requirements shall be in accordance with the prescriptions of Table 10.
© ISO 2016 – All rights reserved

for the

veri fication o f

7


ISO 683-2:2016(E)
8.3 Specific inspection and testing
8.3.1

Verification o f the hardenability, hardness and mechanical properties


For steels being ordered without hardenability requirements, i.e. without the symbol, +H, +HH or +HL

in the designation, the hardness requirements or mechanical properties given for the relevant heattreatment condition in Table 1 , column 8, subcolumn 8.2, shall, with the following exception, be verified.
The requirements given in footnote of Table 1 (mechanical properties of reference test pieces), shall
only be verified i f supplementary requirement specified in B.1 is ordered.
For steels being ordered with the symbol +H, +HH or +HL in the designation (see Tables 5 and 6), unless
otherwise agreed, only the hardenability requirements according to Table 5 or 6 are to be verified.
8.3.2 Visual and dimensional inspection
A su fficient number o f products shall be inspected to ensure the compliance with the specification.

9 Test methods
9.1 Chemical analysis
The choice o f a suitable physical or chemical analytical method for the analysis shall be at the discretion
o f the manu facturer. In cases o f dispute, the method for product analysis used shall be agreed taking

into account the relevant existing International Standards.
NOTE

The list o f available International Standards on chemical analysis is given in ISO/TR 9769.

9.2 Mechanical tests
9.2.1 Tensile test

The tensile test shall be carried out in accordance with ISO 6892-1.
For the specified yield strength in the tables on mechanical properties in this part o f ISO 683, the upper
yield strength, ReH , shall be determined.
I f a yield phenomenon is not present, the 0,2 % proo f strength, Rp0,2 , shall be determined.

9.2.2 Impact test


The impact test shall be carried out in accordance with ISO 148-1.
At the time o f enquiry and order, additional requirements concerning the impact energy and the
verification at temperatures other than room temperature (0 °C, –20 °C and –40 °C) can be agreed.

NOTE

Impact values at lower temperatures cannot be achieved for all steel grades.

The average values o f a set o f three test pieces shall be equal to or greater than the specified value. One
individual value may be below the specified value, provided it is not less than 70 % o f that value.
I f these conditions are not satisfied, additional tests can be done according to ISO 404:2013, 8.3.4.2.

9.3 Hardness and hardenability tests
9.3.1 Hardness in treatment conditions +A and +S
For products in treatment conditions +A (so ft annealed) and +S (treated to improve shearability), the

hardness shall be measured in accordance with ISO 6506-1.
8

© ISO 2016 – All rights reserved


ISO 683-2:2016(E)

9.3.2

Verification o f hardenability

Whenever avai lable , the manu fac tu rer ha s the op tion to veri fy the hardenabi l ity b y c a lc u l ation . T he

c a lc u lation me tho d i s le ft to the d i s c re tion o f the ma nu fac tu rer. I f agre e d at the ti me o f enqu i r y a nd
order, the manu fac tu rer sha l l give s u ffic ient i n formation ab out the c a lc u lation

for

the c u s tomer to

con fi rm the re s u lt.
I f a c a lc u lation

formu la

i s no t ava i lable or i n the c a s e o f d i s pute , a n end quench ha rdenabi l ity te s t

sh a l l b e c arrie d out i n accordance with I S O 6 42 . T he temp eratu re

for

quench i ng sh a l l comply with the

relevant tables in this part of ISO 683. The hardness values shall be determined in accordance with
ISO 6508-1, scale C.
9.3.3

Surface hardness

T he s ur face h ard ne s s o f s te el s a fter fl ame a nd i nduc tion ha rden i ng (s e e

accordance with ISO 6508-1, scale C.


Table 9) shall be determined in

9.4 Retests
Re te s ts

for

s te el s

for

quench i ng a nd temp eri ng and criteri a a re s p e c i fie d i n I S O 4 0 4.

10 Marking

The manufacturer shall mark the products or the bundles or boxes containing the products in a suitable
f
f
(see B.6).
way, s o that the identi fic ation o

© ISO 2016 – All rights reserved

the c a s t, the s te el typ e and the origi n o

the del iver y i s p o s s ible

9



ISO 683-2:2016(E)
Table 1 — Combinations of usual heat-treatment conditions at delivery, product forms and
requirements according to Tables 3 to 9
No.

1

1

2

Heattreatment
condition Symbol
at
delivery

3

4

5

6

7

x indicates applicable to
Semi-

finished


products

Bars Wire
rod

Flat
products

Hammer
and
drop
forgings

x

x

none
2 Untreated or
+U

x

Treated to
3 improve
sheara-

+S


x

x

—

—

—

4 Soft
annealed

+A

x

x

x

x

x

Quenched
5 and
tempered

+QT


—

x

—

x

x

x

x

bility

6 Others
a

T he

O the r tre atme nt c o nd i tio n s ,

fo r

8
9
Applicable requirements if the steel is ordered
with the designation given in

Table 3
Table 5 or 6
8.1

8.2

9.1 9.2

9.3

—a
HardenTable 7
values
column
accordMaximum +S a
ing
As in
hardness
Chemical according
to
column
composiTable
5,
8.1
and
to
tion
6
or
Table

7
8.2
(see
according
column footnote
to Tables 3
+A a
b of
and 4
Table 3)
ab i l i t y

Mechanical
properties Table 8
according
to

Not
applicable

e xa mp le c e r ta i n a n ne a l i n g c o nd i tio n s to ach ie ve a c e r ta i n s tr uc tu re , m ay b e

ag re e d at the ti me o f e nqu i r y a nd o rde r. T he co nd i tio n “a n ne a le d to ach i e ve a s p he ro id i z atio n o f the c a rb ide s ”,

as required for cold heading and cold extrusion, is covered in ISO 4954.

me ch a n ic a l

p ro p e r tie s


s p e c i fie d

in

Table 8 for the quenched and tempered condition shall be achievable after
B.1).

ap p ro p r i ate he at tre atme nt, i f s o ag re e d at the ti me o f e nqu i r y a nd o rde r (fo r re fe re nc e te s t p ie ce s , s e e

10

© ISO 2016 – All rights reserved


ISO 683-2:2016(E)
Table 2 — Surface condition at delivery
No.

1

2
3
4
5
6

1

2


3

4

5
6
7
x indicates in general applicable to

SemiSurface condition at Symbol
products
delivery
(as
blooms,
billets)
f
i

Unless
otherwise
agreed
Particular
conditions
supplied
by
agreement

as hot
worked
HW + pickled

HW + blast
cleaned
HW + rough
machined
others

n

i

s

h

e

d



Bars

8

9

Hammer
and drop
forgings
Flat

Wire rod products
(see
Note 1 to
Clause 1)

None or
+HW

xa

x

x

x

x

+PI

x

x

x

x

x


+BC

x

x

x

x

x

+RM b
—

—
—

x
x

x
x

—
x

x
x


Notes

—

—c

a The term “hot worked” also includes the continuously cast condition (+CC) in the case o f semi-finished products.
b Until the term “rough machined” is defined by, for example machining allowances, the details are to be agreed at the
time o f enquiry and order.
c In addition, it may be agreed that the products be oiled or, where appropriate, limed or phosphated.

Table 3 — Steel grades and chemical composition (applicable to cast analysis) a, b
Steel name

34Cr4
34CrS4
37Cr4
37CrS4
41Cr4
41CrS4
25CrMo4
25CrMoS4

C

Si

Mass fractionc (%)
Mn
P

S
Cr
Mo
Steels without boron

0,035
0,30 to 0,10 to 0,60 to 0,025 0,020
to
0,37 0,40 d 0,90
0,040
0,035
0,34 to 0,10 to 0,60 to 0,025 0,020
to
0,41 0,40 d 0,90
0,040
0,035
0,38 to 0,10 to 0,60 to 0,025 0,020
to
0,45 0,40 d 0,90
0,040
0,035
0,22 to 0,10 to 0,60 to 0,025 0,020
to
0,29 0,40 d 0,90
0,040

Ni

Cu


Others

0,90 to
1,20

—

—

0,40

—

0,90 to
1,20

—

—

0,40

—

0,90 to
1,20

—

—


0,40

—

—

0,40

—

0,90 to 0,15 to
1,20 0,30

NOTE Elements not quoted shall not be intentionally added to the steel without the agreement o f the purchaser, other than
for the purpose o f finishing the heat. All reasonable precautions should be taken to prevent the addition, from scrap or other
material used in manu facture, o f such elements, which a ffect the hardenability, mechanical properties and applicability.
a In the case o f grades with specified hardenability requirements (see Tables 5 and 6), except for phosphorus and sulfur,
insignificant deviations from the limits for cast analysis are permissible; these deviations shall, however, not exceed in the
case o f carbon ±0,01 % and in all other cases, the values according to Table 4.
b Steels with improved machinability either by higher sul fur levels up to about 0,10 % S (including controlled sulfide
morphology) or lead additions may be available on request. In the first case, the upper limit o f the Mn-content may be
increased by 0,15 %.
c Maximum values unless otherwise stated.
d Steels may be supplied with a lower silicon content. In this case, alternative means o f deoxidation shall be used.

© ISO 2016 – All rights reserved

11



ISO 683-2:2016(E)

Table 3 (continued)
Steel name

34CrMo4
34CrMoS4
42CrMo4
42CrMoS4

Mass fraction c (%)
C

Si

Mn

P

S

0,035
0,30 to 0,10 to 0,60 to 0,025 0,020
to
0,37 0,40 d 0,90
0,040
0,035
0,38 to 0,10 to 0,60 to 0,025 0,020
to

0,45 0,40 d 0,90
0,040
to 0,10 to 0,50 to
50CrMo4 0,46
0,54 0,40 d 0,80 0,025 0,035
41CrNiMo2 0,37 to 0,10 to 0,70 to
0,035
0,025
0,020 to
41CrNiMoS2 0,44 0,40 d 1,00
0,040
0,47 to 0,10 to 0,60 to 0,025 0,025
51CrV4
0,55 0,40 d 1,00
to 0,10 to 0,50 to
36CrNiMo4 0,32
0,40 0,40 d 0,80 0,025 0,035
to 0,10 to 0,50 to
34CrNiMo6 0,30
0,38 0,40 d 0,80 0,025 0,035
to 0,10 to 0,50 to
30CrNiMo8 0,26
0,34 0,40 d 0,80 0,025 0,035
0,17 to
0,23
0,27
to
30MnB5
0,33
to

39MnB5 0,36
0,42
to
27MnCrB5-2 0,24
0,30
to
33MnCrB5-2 0,30
0,36
to
39MnCrB6-2 0,36
0,42
20MnB5

0,40
0,40
0,40
0,40
0,40
0,40

1,10 to
1,40
1,15 to
1,45
1,15 to
1,45
1,10 to
1,40
1,20 to
1,50

1,40 to
1,70

Cr

Mo

Ni

Cu

Others

—

0,40

—

0,15 to — 0,40
0,30
0,15 to — 0,40
0,30
0,15 to 0,40 to 0,40
0,30 0,70

—

0,90 to 0,15 to
1,20 0,30

0,90 to
1,20
0,90 to
1,20
0,40 to
0,60
0,80 to
1,10
0,90 to
1,20
1,30 to
1,70
1,80 to
2,20

—
0,15 to
0,30
0,15 to
0,30
0,30 to
0,50

—

0,40

0,90 to 0,40
1,20
1,30 to 0,40

1,70
1,80 to 0,40
2,20

Steels with boron

0,025

0,035

—

—

—

0,025

0,035

—

—

—

0,025

0,035


—

—

0,025

0,035

—

—

0,025

0,035

—

—

0,025

0,035

—
0,30 to
0,60
0,30 to
0,60
0,30 to

0,60

—

—

—
—
V: 0,10 to
0,25
—
—
—
—

to
0,40 B: 0,0008
0,0050
to
0,40 B: 0,0008
0,0050
to
0,40 B: 0,0008
0,0050
to
0,40 B: 0,0008
0,0050
to
0,40 B: 0,0008
0,0050

to
0,40 B: 0,0008
0,0050

NOTE Elements not quoted shall not be intentionally added to the steel without the agreement o f the purchaser, other than
for the purpose o f finishing the heat. All reasonable precautions should be taken to prevent the addition, from scrap or other
material used in manu facture, o f such elements, which a ffect the hardenability, mechanical properties and applicability.
a In the case o f grades with specified hardenability requirements (see Tables 5 and 6), except for phosphorus and sulfur,
insignificant deviations from the limits for cast analysis are permissible; these deviations shall, however, not exceed in the
case o f carbon ±0,01 % and in all other cases, the values according to Table 4.
b Steels with improved machinability either by higher sul fur levels up to about 0,10 % S (including controlled sulfide
morphology) or lead additions may be available on request. In the first case, the upper limit o f the Mn-content may be
increased by 0,15 %.
c Maximum values unless otherwise stated.
d Steels may be supplied with a lower silicon content. In this case, alternative means o f deoxidation shall be used.

12

© ISO 2016 – All rights reserved


ISO 683-2:2016(E)
Table 4 — Permissible deviations between the product analysis and the limiting values given
in Table 3 for the cast analysis
Element

Permissible maximum content
according to cast analysis

Permissible deviation a


mass fraction

mass fraction

%

%

C
Si
Mn
P
S
Cr
Cu
Mo

≤ 0 ,4 0
≤1 ,0 0
1 , 0 0 < M n ≤ 1 ,70
≤ 0 , 0 45
≤ 0 , 0 45
≤2 ,00
2 ,00 < Cr ≤ 2 , 20
≤ 0 ,4 0
≤0,30
0, 3 0 < Mo ≤ 0, 5 0
≤1 ,00


Ni

1 , 0 0 < Ni ≤ 2 , 0 0
2 , 0 0 < Ni ≤ 2 , 2 0

V
B

a

≤0, 25
≤ 0,005 0

± me a n s th at i n o ne c a s t the de vi atio n m ay o cc u r o ver the up p er va lue o r u nder the lo we r va lue o f

the s p e c i fie d ra n ge i n

T

a

b

l

e



5


±0,02
±0,03
±0,03
±0,04
±0,06
+0,005
±0,005
±0,05
±0,10
+0,05
±0,03
±0,04
±0,03
±0,05
±0,07
±0,02
±0,000 3

≤0, 30
0, 30 < C ≤ 0, 55



—



H


a

r

d

n

e

s

s



l

i

Table 3, but not both at the same time.

m

i

t

s




f

o

r



s

t

e

e

l



g

r

a

d


e

see 7.1.4)

s



w

i

t

h



s

p

e

c

i

f
i


e

d



(
n

o

r

m

a

l

)



h

a

r


d

e

n

a

b

i

l

i

t

y


(
+

H



g


r

a

d

e

s

;



Limits Hardness HRC at a distance, in millimetres, from quenched end of test
piece of
Symbol of
range 1,5 3 5 7 9 11 13 15 20 25 30 35 40 45 50
Steels without boron
Steel
name

34Cr4
34CrS4
37Cr4
37CrS4
41Cr4
41CrS4
25CrMo4
25CrMoS4

34CrMo4
34CrMoS4
42CrMo4
42CrMoS4

+H
+H
+H
+H
+H
+H

50CrMo4

+H

41CrNiMo2
41CrNiMoS2

+H

max.
min.
max.
min.
max.
min.
max.
min.
max.

min.
max.
min.
max.
min.
max.
min.

© ISO 2016 – All rights reserved

57
49
59
51
61
53
52
44
57
49
61
53
65
58
60
53

57
48
59

50
61
52
52
43
57
49
61
53
65
58
60
53

56
45
58
48
60
50
51
40
57
48
61
52
64
57
60
52


54
41
57
44
59
47
50
37
56
45
60
51
64
55
59
50

52
35
55
39
58
41
48
34
55
42
60
49

63
54
58
47

49
32
52
36
56
37
46
32
54
39
59
43
63
53
57
42

46
29
50
33
54
34
43
29

53
36
59
40
63
51
55
38

44
27
48
31
52
32
41
27
52
34
58
37
62
48
54
35

39
23
42
26

46
29
37
23
48
30
56
34
61
45
48
30

37
21
39
24
42
26
35
21
45
28
53
32
60
41
42
28


35
20
37
22
40
23
33
20
43
27
51
31
58
39
40
26

34
—
36
20
38
21
32
—
41
26
48
30
57

38
38
25

33
—
35
—
37
—
31
—
40
25
47
30
55
37
37
24

32
—
34
—
36
—
31
—
40

24
46
29
54
36
37
24

31
—
33
—
35
—
31
—
39
24
45
29
54
36
36
23

13


ISO 683-2:2016(E)
Table 5 (continued)

Steel
name

Symbol

51CrV4

+H

36CrNiMo4

+H

34CrNiMo6

+H

30CrNiMo8

+H

Limits Hardness HRC at a distance, in millimetres, from quenched end of test
piece of
of
range 1,5 3 5 7 9 11 13 15 20 25 30 35 40 45 50

max.
min.
max.
min.

max.
min.
max.
min.

Steels with boron

20MnB5

+H

30MnB5

+H

39MnB5

+H

27MnCrB5-2

+H

33MnCrB5-2

+H

39MnCrB6-2

+H


65
57
59
51
58
50
56
48

65
56
59
50
58
50
56
48

64
55
58
49
58
50
56
48

64
54

58
49
58
50
56
48

63
53
57
48
57
49
55
47

62
52
57
47
57
48
55
47

62
50
57
46
57

48
55
47

61
48
56
45
57
48
55
46

60
44
55
43
57
48
55
46

58
41
54
41
57
47
54
45


57
37
53
39
57
47
54
45

55
35
52
38
57
47
54
44

54
34
51
36
57
46
54
44

53
33

50
34
57
45
54
43

53
32
49
33
57
44
54
43

max. 50 49 49 49 47 45 43 41 33 27 — —
min. 42 41 40 37 30 22 — — — — — —
max. 56 55 55 54 53 51 50 47 40 37 33 —
min. 47 46 45 44 42 39 36 31 22 — — —
max. 60 60 59 58 57 57 55 53 48 41 37 33
min. 52 51 50 49 47 44 41 35 28 24 20 —
max. 55 55 55 54 54 53 52 51 47 44 40 37
min. 47 46 45 44 43 41 39 36 30 24 20 —
max. 57 57 57 57 57 56 55 54 53 50 47 45
min. 48 47 47 46 45 44 43 41 36 31 25 20
max. 59 59 59 59 58 58 58 58 57 57 56 55
min. 51 51 51 51 50 50 50 49 47 45 40 35

—

—
—
—
31
—
—
—
—
—
54
32

—
—
—
—
—
—
—
—
—
—
—
—

—
—
—
—
—

—
—
—
—
—
—
—

Table 6 — Hardness limits for steels with narrowed hardenability scatterbands (+HH and
+HL grades)
Steel
name

34Cr4
34CrS4
37Cr4
37CrS4
41Cr4
41CrS4

14

Lim- Hardness HRC at a distance, in millimetres, from quenched end of test piece of
Symbol its
of 1,5 3 5 7 9 11 13 15 20 25 30 35 40 45 50
range

+HH
+HL
+HH

+HL
+HH
+HL

max.
min.
max.
min.
max.
min.
max.
min.
max.
min.
max.
min.

57
52
54
49
59
54
56
51
61
56
58
53


57
51
54
48
59
53
56
50
61
55
58
52

56
49
52
45
58
51
55
48
60
53
57
50

54
45
50
41

57
48
53
44
59
51
55
47

52
41
46
35
55
44
50
39
58
47
52
41

49
38
43
32
52
41
47
36

56
43
50
37

46
35
40
29
50
39
44
33
54
41
47
34

44
33
38
27
48
37
42
31
52
39
45
32


39
28
34
23
42
31
37
26
46
35
40
29

37
26
32
21
39
29
34
24
42
31
37
26

35
25
30

20
37
27
32
22
40
29
34
23

34
24
29
—
36
25
31
20
38
27
32
21

33
23
28
—
35
24
30

—
37
26
31
—

32
22
27
—
34
23
29
—
36
25
30
—

31
21
26
—
33
22
28
—
35
24
29

—

© ISO 2016 – All rights reserved


ISO 683-2:2016(E)
Table 6 (continued)
Steel
name

25CrMo4
25CrMoS4
34CrMo4
34CrMoS4
42CrMo4
42CrMoS4
50CrMo4
41CrNiMo2
41CrNiMoS2
51CrV4
36CrNiMo4
34CrNiMo6
30CrNiMo8

Lim- Hardness HRC at a distance, in millimetres, from quenched end of test piece of
Symbol its
of 1,5 3
5 7 9 11 13 15 20 25 30 35 40 45 50
range


+HH
+HL
+HH
+HL
+HH
+HL
+HH
+HL
+HH
+HL
+HH
+HL
+HH
+HL
+HH
+HL
+HH
+HL

max.
min.
max.
min.
max.
min.
max.
min.
max.
min.
max.

min.
max.
min.
max.
min.
max.
min.
max.
min.
max.
min.
max.
min.
max.
min.
max.
min.
max.
min.
max.
min.
max.
min.
max.
min.

52
47
49
44

57
52
54
49
61
56
58
53
65
60
63
58
60
55
58
53
65
60
62
57
59
54
56
51
58
53
55
50
56
51

53
48

© ISO 2016 – All rights reserved

52
46
49
43
57
52
54
49
61
56
58
53
65
60
63
58
60
55
58
53
65
59
62
56
59

53
56
50
58
53
55
50
56
51
53
48

51
44
47
40
57
51
54
48
61
55
58
52
64
59
62
57
60
55

57
52
64
58
61
55
58
52
55
49
58
53
55
50
56
51
53
48

50
41
46
37
56
49
52
45
60
54
57

51
64
58
61
55
59
53
56
50
64
57
61
54
58
52
55
49
58
53
55
50
56
51
53
48

48
39
43
34

55
46
51
42
60
52
56
49
63
57
60
54
58
51
54
47
63
56
60
53
57
51
54
48
57
52
54
49
55
50

52
47

46
37
41
32
54
44
49
39
59
48
54
43
63
56
60
53
57
47
52
42
62
55
59
52
57
50
54

47
57
51
54
48
55
50
52
47

43
34
38
29
53
42
47
36
59
46
53
40
63
55
59
51
55
44
49
38

62
54
58
50
57
50
53
46
57
51
54
48
55
50
52
47

41
32
36
27
52
40
46
34
58
44
51
37
62

53
57
48
54
41
48
35
61
52
57
48
56
49
52
45
57
51
54
48
55
49
52
46

37
28
32
23
48
36

42
30
56
41
49
34
61
50
56
45
48
36
42
30
60
49
55
44
55
47
51
43
57
51
54
48
55
49
52
46


35
26
30
21
45
34
39
28
53
39
46
32
60
47
54
41
42
33
37
28
58
47
52
41
54
45
50
41
57

50
54
47
54
48
51
45

33
24
29
20
43
32
38
27
51
38
44
31
58
45
52
39
40
31
35
26
57
44

50
37
53
44
48
39
57
50
54
47
54
48
51
45

32
23
28
—
41
31
36
26
48
36
42
30
57
44
51

38
38
29
34
25
55
42
48
35
52
43
47
38
57
50
54
47
54
47
51
44

31
22
27
—
40
30
35
25

47
36
41
30
55
43
49
37
37
28
33
24
54
41
47
34
51
41
46
36
57
50
53
46
54
47
51
44

31

22
27
—
40
29
35
24
46
35
40
29
54
42
48
36
37
28
33
24
53
40
46
33
50
39
45
34
57
49
53

45
54
47
50
43

31
22
27
—
39
29
34
24
45
34
40
29
54
42
48
36
36
27
32
23
53
39
46
32

49
38
44
33
57
48
53
44
54
47
50
43

15


ISO 683-2:2016(E)
Table 7 — Maximum hardness for products delivered in the conditions “treated to improve
shearability” (+S) or “soft annealed” (+A)
Steel name a

+S

34Cr4, 34CrS4
37Cr4, 37CrS4
41Cr4, 41CrS4
25CrMo4, 25CrMoS4
34CrMo4, 34CrMoS4
42CrMo4, 42CrMoS4
50CrMo4

41CrNiMo2, 41CrNiMoS2
51CrV4
36CrNiMo4
34CrNiMo6
30CrNiMo8
20MnB5
30MnB5
39MnB5
27MnCrB5-2
33MnCrB5-2
39MnCrB6-2
a

255
255
255 c
255
255
255 c
—d
255
—d
—d
—d
—d
—e
—e
—e
—e
255

255

+A

223
235
241
212
223
241
248
217
248
248
248
248
—f
—f
—f
—f
—f
—f

T he va lue s ap p l y a l s o to the va r io u s h a rden ab i l i t y (+H , +H H a nd +H L) g rade s co vere d i n

and 6

b
c


HBW max. in conditionb

; see

fo o tno te

d

fo r

Tables 5

co nd i tio n s .

T he va lue s a re no t ap p l ic ab le to co nti nuo u s l y c a s t a nd no t

fu r ther

de fo r me d s l ab s .

D ep end i n g o n chem ic a l co mp o s i tio n a nd o n d i men s io n s , p a r tic u l a rl y i n the c a s e o f the +H H g rade s ,

s o ft a n ne a l i n g m ay b e ne ce s s a r y.

d

W he re

the


s he a rab i l i ty

is

o f i mp o r ta nce ,

th i s

annealed”.
e Shearable in the untreated condition.
f Condition +A is not applicable to boron steels.

16

s te e l

s ho u ld

be

o rdere d

in

the

co nd itio n

“s o ft


© ISO 2016 – All rights reserved


© ISO 2016 – All rights reserved

Table 8 — Mechanical properties in the quenched and tempered condition a

Mechanical properties for ruling sections (see Annex A) with a diameter, d
16 mm < d
40 mm < d
8 mm < t
20 mm < t

, or

d ≤ 16 mm
t ≤ 8 mm
Steel name

R P0,2

min.
MPac

Rm

≤ 40 mm

Zb


%

%

min. min.

KV2

min.
J

R P0,2

min.
MPac

min.

Zb
min.

%

%

A

Rm

fl at p r o duc ts w i th th i c kn e s s ,


100 mm < d
60 mm < t

≤ 10 0 mm

≤ 2 0 mm

A

fo r

≤ 60 mm

KV2

min.
J

R P0,2

min.
MPa c

Rm

A

Zb


%

%

min. min.

KV2

min.
J

t, of

160 mm < d
100 mm < t

≤ 160 mm

≤ 10 0 mm

R P0,2

Rm
min.
MPac

A

Zb


min.

min.

%

%

KV2

min.
J

R P0,2

Rm
min.
MPa c

≤ 2 50 mm
≤ 160 mm

A

Zb

min.

min.


%

%

KV2

min.
J

34Cr4
34CrS4

to
700 900
1 100

12

35

—d

to
590 800
950

14

40


40 d

460

700 to
850

15

45

40 d

—

—

—

—

—

—

—

—

—


—

37Cr4
37CrS4

to
750 950
1 150

11

35

—d

to
630 850
1 000

13

40

35 d

510

750 to
900


14

40

35 d

—

—

—

—

—

—

—

—

—

—

41Cr4
41CrS4


to
800 1 1000
200 11

30

—d

to
660 900
1 100

12

35

35 d

560

800 to
950

14

40

35 d

—


—

—

—

—

—

—

—

—

—

25CrMo4
25CrMoS4

to
700 900
1 100

12

50


—d

to
600 800
950

14

55

50 d

450

700 to
850

15

60

50 d

to
400 650
800

16

60


45 d

—

—

—

—

—

34CrMo4
34CrMoS4

to
800 1 1000
200 11

45

—d

to
650 900
1 100

12


50

40 d

550

800 to
950

14

55

45 d

to
500 750
900

15

55

45 d

to
450 700
850

15


60

45 d

42CrMo4
42CrMoS4

to
900 1 1100
300 10

40

—d

to
750 1 1000
200

11

45

35 d

650

900 to
1 100


12

50

35 d

to
550 800
950

13

50

35 d

to
500 750
900

14

55

35 d

a

R P0,2 : 0 , 2 % - p ro o f s tre s s ;

R m : te n s i l e s tre n g th ; A is the percentage elongation after fracture ( L

= 5 , 65

S

0

; see

Table 10

, c o l u m n 7a , l i n e T4) ;

Z is the reduction in cross-section on fracture.

T h e s e va lue s a re o p ti o n a l a nd c a n b e a g re e d at th e ti m e o f e n qu i r y a n d o rde r.

1 MPa = 1 N/mm 2 .
I f te s ti n g o f C h a r p y- U - no tc h i m p ac t te s t p i e c e s i s re qu i re d , th e m i n i mu m i mp ac t s tre n g th va l ue s h a l l b e a g re e d .

Up to d

≤ 6 3 m m d i a me te r a n d

t ≤ 35 mm.

17

ISO 683-2:2016(E)


b
c
d
e

0

KV2 : i mp ac t s tre n g th o f lo n g i tud i n a l C h a r p y V- n o tc h te s t p i e c e s w i th s tr i ke r rad i u s 2 m m ; ave ra ge o f 3 i n d i v i du a l va lue s , n o i n d i vi du a l va lue s h a l l b e lo we r th a n 70 % o f th e m i n i mu m ave ra ge va lue .


Mechanical properties for ruling sections (see Annex A) with a diameter, d
16 mm < d
40 mm < d
8 mm < t
20 mm < t

, or

d ≤ 16 mm
t ≤ 8 mm
Steel name

R P0,2

min.
MPac

Rm


≤ 40 mm

Zb

%

%

min. min.

KV2

min.
J

R P0,2

min.
MPac

min.

Zb
min.

%

%

A


Rm

fl at p r o duc ts w i th th i c kn e s s ,

100 mm < d
60 mm < t

≤ 10 0 mm

≤ 2 0 mm

A

fo r

≤ 60 mm

KV2

min.
J

R P0,2

min.
MPa c

Rm


A

Zb

%

%

min. min.

KV2

min.
J

t, of

160 mm < d
100 mm < t

≤ 160 mm

≤ 10 0 mm

R P0,2

min.
MPac

Rm


A

Zb

min.

min.

%

%

KV2

min.
J

R P0,2

min.
MPa c

Rm

≤ 2 50 mm
≤ 160 mm

A


Zb

min.

min.

%

%

KV2

min.
J

50CrMo4

to
900 1 1100
300

9

40

—d

to
780 1 1000
200


10

45

30 d

700

900 to
1 100

12

50

30 d

to
650 850
1 000

13

50

30 d

to
550 800

950

13

50

30 d

41CrNiMo2
41CrNiMoS2

to
840 1 1000
200 10

—

—d

to
740 900
1 100

11

—

—d

640


800 to
950

12

—

—d

to
540 750
900

13

—

—d

—

—

—

—

51CrV4


to
900 1 1100
300

9

40

—d

to
800 1 1000
200

10

45

30 d

700

900 to
1 100

12

50

30 d


to
650 850
1 000

13

50

30 d

to
600 800
950

13

50

30 d

36CrNiMo4

to
900 1 1100
300 10

—

—d


to
800 1 1000
200

11

—

—d

700

900 to
1 100

12

—

—d

to
600 800
950

13

—


—d

to
550 750
900

14

—

—d

34CrNiMo6

to
1 000 1 1200
400

9

40

—d

to
900 1 1100
300

10


45

45 d

800

1 000
to
1 200

11

50

45 d

to
700 900
1 100

12

55

45 d

to
600 800
950


13

55

45 d

30CrNiMo8

to
850 1 1030
230 12

40

—d

to
850 1 1030
230

12

40

30 d

800

980 to
1 180


12

45

35 d

to
800 980
1 180

12

50

45 d

to
750 930
1 130

12

50

45 d

a

© ISO 2016 – All rights reserved


R P0,2 : 0 , 2 % - p ro o f s tre s s ;
R m : te n s i l e s tre n g th ; A is the percentage elongation after fracture ( L

b
c
d
e

—

0

= 5 , 65

S

0

; see

Table 10

, c o l u m n 7a , l i n e T4) ;

Z is the reduction in cross-section on fracture.

KV2 : i mp ac t s tre n g th o f lo n g i tud i n a l C h a r p y V- n o tc h te s t p i e c e s w i th s tr i ke r rad i u s 2 m m ; ave ra ge o f 3 i n d i v i du a l va lue s , n o i n d i vi du a l va lue s h a l l b e lo we r th a n 70 % o f th e m i n i mu m ave ra ge va lue .
T h e s e va lue s a re o p ti o n a l a nd c a n b e a g re e d at th e ti m e o f e n qu i r y a n d o rde r.


1 MPa = 1 N/mm 2 .
I f te s ti n g o f C h a r p y- U - no tc h i m p ac t te s t p i e c e s i s re qu i re d , th e m i n i mu m i mp ac t s tre n g th va l ue s h a l l b e a g re e d .

Up to d

≤ 6 3 m m d i a me te r a n d

t ≤ 35 mm.

ISO 683-2:2016(E)

18

Table 8 (continued)


© ISO 2016 – All rights reserved

Table 8 (continued)

Mechanical properties for ruling sections (see Annex A) with a diameter, d
16 mm < d
40 mm < d
8 mm < t
20 mm < t

, or

d ≤ 16 mm
t ≤ 8 mm

Steel name

R P0,2

min.
MPac

Rm

≤ 40 mm

Zb

%

%

min. min.

KV2

min.
J

R P0,2

min.
MPac

min.


Zb
min.

%

%

A

Rm

fl at p r o duc ts w i th th i c kn e s s ,

100 mm < d
60 mm < t

≤ 10 0 mm

≤ 2 0 mm

A

fo r

≤ 60 mm

KV2

min.

J

R P0,2

min.
MPa c

Rm

A

Zb

%

%

min. min.

KV2

min.
J

t, of

160 mm < d
100 mm < t

≤ 160 mm


≤ 10 0 mm

R P0,2

min.
MPac

Rm

A

Zb

min.

min.

%

%

KV2

min.
J

R P0,2

min.

MPa c

Rm

≤ 2 50 mm
≤ 160 mm

A

Zb

min.

min.

%

%

KV2

min.
J

20MnB5

to
700 900
1 050


14

55

—d

to
600 750
900

15

55

60 d

—

—

—

—

—

—

—


—

—

—

—

—

—

—

—

30MnB5

to
800 950
1 150

13

50

—d

to
650 800

950

13

50

60 d

—

—

—

—

—

—

—

—

—

—

—


—

—

—

—

39MnB5

to
900 1 1050
250 12

50

—d

to
700 850
1050

12

50

60 d

—


—

—

—

—

—

—

—

—

—

—

—

—

—

—

27MnCrB5-2


to
800 1 1000
250 14

55

—d

to
750 900
1 150

14

55

60 d

to
700 e 1800
000 e 15 e

55 e

65 d,e

—

—


—

—

—

—

—

—

—

—

33MnCrB5-2

to
850 1 1050
300 13

50

—d

to
800 950
1 200


13

50

50 d

to
750 e 1900
100 e

13 e

50 e

50 d,e

—

—

—

—

—

—

—


—

—

—

39MnCrB6-2

to
900 1 1100
350 12

50

—d

to
850 1 1050
250

12

50

40 d

800 e

1 000
12 e

to
1 200 e

50 e

40 d,e

—

—

—

—

—

—

—

—

—

—

a

R P0,2 : 0 , 2 % - p ro o f s tre s s ;

R m : te n s i l e s tre n g th ; A is the percentage elongation after fracture ( L

= 5 , 65

S

0

; see

Table 10

, c o l u m n 7a , l i n e T4) ;

Z is the reduction in cross-section on fracture.

T h e s e va lue s a re o p ti o n a l a nd c a n b e a g re e d at th e ti m e o f e n qu i r y a n d o rde r.

1 MPa = 1 N/mm 2 .
I f te s ti n g o f C h a r p y- U - no tc h i m p ac t te s t p i e c e s i s re qu i re d , th e m i n i mu m i mp ac t s tre n g th va l ue s h a l l b e a g re e d .

Up to d

≤ 6 3 m m d i a me te r a n d

t ≤ 35 mm.

19

ISO 683-2:2016(E)


b
c
d
e

0

KV2 : i mp ac t s tre n g th o f lo n g i tud i n a l C h a r p y V- n o tc h te s t p i e c e s w i th s tr i ke r rad i u s 2 m m ; ave ra ge o f 3 i n d i v i du a l va lue s , n o i n d i vi du a l va lue s h a l l b e lo we r th a n 70 % o f th e m i n i mu m ave ra ge va lue .