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 • CP 401 CH-1214 Vernier, Geneva, Switzerland Tel +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org ii © ISO 2016 – All rights reserved ISO 683-2:2016(E) Page Contents Foreword v Scope Normative references Terms and definitions Classification and designation 4.2 Designation C las s ificatio n Information to be supplied by the purchaser 5.3 Ordering example Manufacturing process 6.1 General 6.2 Deoxidation f 6.3.1 Heat-treatment condition 6.3.2 Particular surface conditions f Requirements 7.1.1 General 7.1.2 Chemical composition 7.1.3 Mechanical properties 7.1.5 Surface hardness 7.4 Grain size 7.5 Non-metallic inclusions 7.5.1 Microscopic inclusions 7.5.2 Macroscopic inclusions 7.6 Internal soundness f 7.8 Decarburization 7.9 Shape, dimensions and tolerances Inspection f f f 8.3.2 Visual and dimensional inspection Test methods 9.2 Mechanical tests 9.2.1 Tensile test 9.2.2 Impact test 9.3.1 Hardness in treatment conditions +A and +S f 9.3.3 Surface hardness 9.4 Retests M andato ry in fo rmatio n 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 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 the cas t 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 Verificatio n o © ISO 2016 – All rights reserved hardenab ility iii ISO 683-2:2016(E) 10 Marking (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 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 (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 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 Scope T h i s p a r t o f I S O 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 of products in Table and in one of the surface conditions given in Table The steels are, in general, intended for the manufacture of quenched and tempered or austempered (see 3.2 Tables and 9) The requirements for mechanical properties given in this part of ISO 683 are restricted to the sizes given in the relevant Table 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 ) and flame - or i nduc tion-h ardene d mach i ne p ar ts (s e e NO TE 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 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 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 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 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 , the genera l te ch n ic a l del iver y re qu i rements o f I S O 4 are appl ic able Normative references T he fol lowi ng i nd i s p en s able c u ments , i n whole or i n p ar t, are normatively re ference d i n th i s 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 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 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 Terms and definitions For the pu rp o s e s o f th i s c ument, I S O 69 9, I S O 142 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 7, ISO 48 85 , ISO 49 -1 , ISO 49 -2 , apply the s e ter m s a nd de fi n ition s , s e e N o te s a nd o f Clause 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 l l apply N o te 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 © 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 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 C 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 5.1 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 ; f ) the symbol for the required heat-treatment condition (see Table , 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 ) 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 ISO 683-2:2016(E) b) any requirement for the hardenability (+H, +HH, +HL) for special steels (see 7.1.4 and Tables to ); 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 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 ), product analysis/option B.4 with an inspection certificate 3.1 according to ISO 10474: 50 round bars ISO 1035 – 40,0S × 000L2 ISO 683-2 – 42CrMo4+S +BC option B.4 ISO 10474 – 3.1 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 to 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 to 6.4 Traceability of the cast Each product shall be traceable to the cast (see Clause 10) © ISO 2016 – All rights reserved ISO 683-2:2016(E) Dimensions in millimetres Key A B C a b c sample rough specimen test piece tensile test piece notched bar impact test piece round and similar shaped sections rectangular and square sections For small products (d or w ≤ mm) , the tes t p iece s hall, i f p o s s ib le, co ns is t o f an un- machined p art o f the b ar Fo r ro und b ars , the lo ngitudinal axis o f the no tch s hall b e ap p roximately p arallel to the directio n o f a diameter For rectangular bars, the longitudinal axis of the notch shall be perpendicular to the wider rolling surface Figure — Location of the test pieces in bars, seamless rolled rings and rods 28 © ISO 2016 – All rights reserved ISO 683-2:2016(E) Dimensions in millimetres Key a principal direction of rolling I n the cas e o f s teel grades in the quenched and temp ered co nditio n with requirements width o f the s amp le s hall b e s u fficient NO TE fo r I n c a s e o f d i ffic u lty ta ki n g the te s t pie ce of it is getting as close as possible to w/4 fo r imp act energy, the Figure w/4, take the sample from the position where the centre lo ngitudinal imp act tes t p ieces to b e taken as s p ecified in from Figure — Location o f the samples (A and B) in flat products in relation to the product width © ISO 2016 – All rights reserved 29 ISO 683-2:2016(E) Type of test Product thickness Location of the test piece a for a product width of mm Distance of the test piece from the rolled surface mm w < 600 mm w longitudinal transverse longitudinal longitudinal ≥ 60 mm ≤30 Tensile testb, e >30 Impact testc >12 d Location of the longitudinal axis of the test piece with respect to the principal rolling direction a b c d T he te s t p ie ce s h a l l co mp l y wi th I S O -1 The longitudinal axis of the notch shall be perpendicular to the rolled surface I f a gre e d at the ti me o f o rde r i n g , the te s t p ie ce from 1/4 product thickness e If me ch a n ic a l p ro p e r tie s a re de te r m i ne d T he a xi s o f the te s t p ie ce s h a l l b e i n t/2 fo r in fro m the p ro duc ts wi th a th ickne s s e xce e d i n g de l i ver y co nd i tio n + QT, ro u nd te s t th ickne s s e s ≤ m m a nd , m m b elo w the s u r face m m m ay b e ta ke n p ie ce s fo r shall be ta ken th ickne s s e s > m m Key rolled surface alternatives F 30 i g u r e — L o c a t i o n o f t h e t e s t p i e c e f r o m f l a t p r o d u c t s i n r e l a t i o n t o p r o d u c t t h i c k n e s s a n d principal direction of rolling © ISO 2016 – All rights reserved ISO 683-2:2016(E) Annex A (normative) Ruling sections for mechanical properties A D e f i n i t i o n See 3.1 A.2 Determination of the diameter of the equivalent ruling section A.2.1 If the test pieces are taken from products with simple cross-sections and from positions with A.2.1.1 to A.2.1.3 quas i- two - dimens io nal heat flo w, s hall ap p ly For rounds, the nominal diameter of the product (not comprising the machining allowance) shall be taken as the diameter of the ruling section A.2.1.1 A.2.1.2 For hexagons and octagons, the nominal distance between two opposite sides of the crosssection shall be taken as the diameter of the ruling section A.2.1.3 For square and rectangular bars, the diameter of the ruling section shall be determined in accordance with the example shown in Figure A.1 © ISO 2016 – All rights reserved 31 ISO 683-2:2016(E) Dimensions in millimetres Key X Y EXAMPLE width thickness diameter of the ruling cross section For a rectangular bar with a section of 40 mm × 60 mm, the diameter of the ruling section is 50 mm Figure A.1 — Diameter of the equivalent ruling section for square and rectangular sections for quenching in oil or water A.2.2 Fo r o ther p ro duct fo rms , the ruling s ectio n s hall b e agreed at the time o f enquiry and o rder NOTE For this purpose, the following procedure can serve as a guideline The product is hardened in accordance with usual practice It is then cut so that the hardness and structure at the position of the ruling s e c tio n p rovide d for ta ki ng te s t p ie ce s c a n b e de ter m i ne d From a no ther p ro duc t o f the typ e u nder s ideration a nd o f the s a me c a s t, a n end quench p ie ce i s ta ken from the pre s c r ib e d p o s itio n a nd te s te d i n the u s u a l way T hen , the distance is determined at which the end quench test piece shows the same hardness and structure as the ruling section at the position provided for taking test pieces On the basis of this distance, the diameter of the ruling section is then estimated using Figure A.2 and Figure A.3 32 © ISO 2016 – All rights reserved ISO 683-2:2016(E) Dimensions in millimetres Key X distance from the quenched end Y bar diameter surface three-quarter radius centre NOTE Source: Reference [13] Figure A.2 — Relationship between the cooling rates in end quench test pieces (Jominy test pieces) and in quenched round bars in mildly agitated water © ISO 2016 – All rights reserved 33 ISO 683-2:2016(E) Dimensions in millimetres Key X distance from the quenched end Y bar diameter surface three-quarter radius centre NOTE Source: Reference [13] Figure A.3 — Relationship between the cooling rates in end quench test pieces (Jominy test pieces) and in quenched round bars in mildly agitated oil 34 © ISO 2016 – All rights reserved ISO 683-2:2016(E) Annex B (normative) Supplementary or special requirements NO TE I t i s i ntende d th at one or more o f the fo l lowi ng s upp lementa r y or s p e c i a l re qu i rements b e app l ie d , b ut on l y where s p e c i fie d i n the enqu i r y a nd o rder I t i s i ntende d th at, where ne ce s s a r y, de ta i l s o f the s e re qu i rements b e agre e d up o n b y the m a nu fac tu rer a nd pu rch a s er at the ti me o f enqu i r y a nd order B.1 Mechanical properties of reference test pieces in the quenched and tempered condition For deliveries in a condition other than quenched and tempered or normalized, the requirements for the mechanical prop erties in the quenched and temp ered condition shal l b e veri fied on a re ference tes t piece In the case of bars and rods, the sample to be quenched and tempered shall, unless otherwise agreed, have the cross-section of the product In all other cases, the dimensions and the manufacture of f consideration the indications for the determination of the ruling section given in Annex A The samples shall be quenched and tempered in accordance with the conditions given in the relevant table for f f treatment shall be given in the inspection document The test pieces shall, unless otherwise agreed, be taken in accordance with Figure for bars and rods and in accordance with Figures and f products the s a mple sha l l b e agre e d at the ti me o enqu i r y and order, where appropri ate, wh i le ta ki ng i nto the he at-tre atment cond ition s or as agre e d at the ti me o enqui r y and order T he de tai l s o the he at or flat B.2 Fine grain steel T h i s s upplementa r y re qui rement concern s on ly the veri fic ation o f the fi ne grai n s i ze When te s te d i n accordance with I S O 43 , the s te el s l l h ave an au s ten ite grai n s i z e o f or fi ner I f s p e ci fic te s ti ng i s ordere d, it s l l a l s o b e agre e d whe ther th i s gra i n s i z e re qu i rement i s to b e veri fie d b y de term i n i ng the a lu m i n iu m content or m icro graph ic a l ly I n the fi rs t c as e, the a lu m i n iu m content shall also be agreed upon In the second case, one test piece shall be inspected per cast for the determination of the austenitic gra i n s i ze S ampl i ng a nd s a mple prep a ration s l l b e as s p e ci fie d i n I S O 43 Un le s s o ther wi s e agre e d at the ti me o f enqui r y and order, the quenche d grai n s i z e s l l b e de term i ne d Hardening shall be carried out under the following conditions for the purposes of determining the quenched grain size: — for s te el s with a c a rb on content l i m it < , % : (8 ±10) ° C , m i n/water; — for s te el s with a c a rb on content l i m it ≥ , % : (8 ±10) ° C , m i n/water I n ca s e s o f d i s pute, pre -tre atment at 1 ° C uniform starting condition for m i n/ai r sha l l b e c a rrie d out i n order to pro duce a B.3 Non-destructive tests T he pro duc ts sh a l l b e non- de s truc tively te s te d u nder cond ition s and to an accep ta nce s tandard agre e d at the ti me o f enqu i r y and order © ISO 2016 – All rights reserved 35 ISO 683-2:2016(E) B.4 Product analysis O ne pro duc t ana lys i s s l l b e c arrie d out p er c a s t are s p e c i fie d for T he cond ition s for the de term i nation o f a l l elements for wh ich va lue s the c as t ana lys i s o f the s te el typ e concerne d for s a mpl i ng sha l l b e i n accordance with I S O 142 I n c a s e s o f d i s pute, the a na lys i s s l l be carried out, if possible, in accordance with a reference method taken from one of the International Standards listed in ISO/TR 9769 B.5 Reduction ratio and deformation ratio If the central soundness of the hot-rolled or forged products is important, the purchaser shall be aware that a minimum reduction ratio (referred to the cross-section) for long products or a minimum th ickne s s de formation ratio (re ferre d to the th ickne s s) for flat pro duc ts i s ne ce s s ar y I n th i s c as e, a m i n i mum re duc tion ratio or a m i n i mu m th ickne s s de formation ratio o f 4: may b e agre e d at the ti me o f enqu i r y a nd order B.6 Special agreements for marking T he pro duc ts s l l b e ma rke d i n a way s p e c ia l ly agre e d at the ti me o f enqu i r y and order 36 © ISO 2016 – All rights reserved ISO 683-2:2016(E) Annex C (informative) Designation of steels given in this part of ISO 683 and of comparable grades covered in various designation systems Table C.1 — Designation of steels given in this part of ISO 683 and of comparable grades covered in various designation systems Steel designations according to a ISO name (ISO 683-2) ISO number (ISO 683-2) Steels without boron ASTM A 830/ UNS b — i/n/wf – EN 10083 3:2006 numberc — i/n/wf — SCr435/ SCr435H — — — SCr440 SCr440H — SCM425/ SCM425H — SCM435/ SCM435H — SCM440/ SCM440H — — SNCM240 — — — — — 34Cr4 — — — 34Cr4 1.7033 n 34CrS4 37Cr4 37CrS4 41Cr4 — — — — — — — — — — — — 34CrS4 37Cr4 37CrS4 41Cr4 1.7037 1.7034 1.7038 1.7035 n n n n 41CrS4 25CrMo4 — — — — — — 41CrS4 25CrMo4 1.7039 1.7218 n n 25CrMoS4 34CrMo4 — — — 4135 — n 25CrMoS4 34CrMo4 1.7213 1.7220 n n 34CrMoS4 42CrMo4 — — — 4142 — n 34CrMoS4 42CrMo4 1.7226 1.7225 n n 42CrMoS4 50CrMo4 41CrNiMo2 41CrNiMoS2 51CrV4 36CrNiMo4 34CrNiMo6 30CrNiMo8 — — — — — — — — — 4150 8640 — 6150 — — — — n n — n — — — 42CrMoS4 1.7227 50CrMo4 1.7228 41CrNiMo2 (1.6584) 41CrNiMoS2 (1.6588) 51CrV4 1.8159 36CrNiMo4 (1.6511) 34CrNiMo6 1.6582 30CrNiMo8 1.6580 n n i i n i n n a b GB/XXXXX/ 200X/ISC e JIS d i/n/w f — i/n/w f n — — — — — n — — — — — — — — — n — — — — — n — — — — — n — — — — — — n — — — — — — — — — — — — — — — — — — — — — See the sources in Bibliography US steel listed in ASTM A 830 and in UNS (i f the steel number is given in brackets, then the steel has only a UNS number) c European steel listed in EN 10083–3 and in the “Stahl-Eisen-Liste” (if the steel number is given in parentheses/brackets, the steel is only listed in the “Stahl-Eisen-Liste”) d Japanese Industrial Standard e Chinese National Standard f i = identical steel to ISO steel grade; n = steel grade with closer match o f composition, but not identical; w = wider match © ISO 2016 – All rights reserved 37 ISO 683-2:2016(E) Table C.1 (continued) Steel designations according to a ISO name (ISO 683-2) ISO number (ISO 683-2) Steels with boron 20MnB5 30MnB5 39MnB5 27MnCrB5–2 33MnCrB5–2 39MnCrB6–2 a b — — — — — — ASTM A 830/ UNS b — i/n/wf — — — — — — — — — — — — – EN 10083 3:2006 numberc — 20MnB5 30MnB5 38MnB5 27MnCrB5–2 33MnCrB5–2 39MnCrB6–2 1.5530 1.5531 1.5532 1.7182 1.7185 1.7189 GB/XXXXX/ 200X/ISC e JIS d i/n/w f — i/n/wf — i i i i i i SWRCHB620 — — — — — n — — — — — — — — — — — i/n/wf — — — — — — See the sources in Bibliography US steel listed in ASTM A 830 and in UNS (i f the steel number is given in brackets, then the steel has only a UNS number) c European steel listed in EN 10083–3 and in the “Stahl-Eisen-Liste” (if the steel number is given in parentheses/brackets, the steel is only listed in the “Stahl-Eisen-Liste”) d Japanese Industrial Standard e Chinese National Standard f i = identical steel to ISO steel grade; n = steel grade with closer match o f composition, but not identical; w = wider match 38 © ISO 2016 – All rights reserved ISO 683-2:2016(E) Annex D (informative) Dimensional standards applicable to products complying with this part of ISO 683 a) b) c) d) e) f) g) ISO 1035-1, Hot-rolled steel bars — Part 1: Dimensions of round bars ISO 1035-2, Hot-rolled steel bars — Part 2: Dimensions of square bars ISO 1035-3, Hot-rolled steel bars — Part 3: Dimensions of flat bars ISO 1035-4, Hot-rolled steel bars — Part 4: Tolerances ISO 7452, Hot-rolled steel plates — Tolerances on dimensions and shape ISO 16124, Steel wire rod — Dimensions and tolerances ISO 16160, Continuously hot-rolled steel sheet products — Dimensional and shape tolerances © ISO 2016 – All rights reserved 39 ISO 683-2:2016(E) Bibliography [1] ISO 683-1, Heat-treatable steels, alloy steels and free-cutting steels — Part 1: Non alloy steels for [2] [3] [4] [5] ISO 683-3, Heat-treatable steels, alloy steels and free-cutting steels — Part 3: Case-hardening steels ISO 683-4, Heat-treatable steels, alloy steels and free-cutting steels — Part 4: Free-cutting steels ISO 683-5, Heat treatable steels, alloy steels and free-cutting steels — Part 5: Nitriding steels ISO 683-14, Heat-treatable steels, alloy steels and free-cutting steels — Part 14: Hot-rolled steels for [6] ISO 683-18, [7] [8] [8] [9] [10] ISO 4954, Steels for cold heading and cold extruding ISO 4960, Cold-reduced carbon steel strip with a mass fraction of carbon over 0, 25 % ISO/TR 9769, Steel and iron — Review of available methods of analysis EN 10204, Metallic products — Types of inspection documents EN 10247, Micrographic examination of the non-metallic inclusion content of steels using standard quenching and tempering quenched and tempered springs products Heat-treatable steels, alloy steels and free-cutting steels — Part 18: Bright steel pictures [11] JIS G 0415, Steel and steel products — Inspection documents [12] JIS G 0555, Microscopic testing method for the non-metallic inclusions in steel [13] SAE J406c, Methods of Determining Hardenability of Steels 40 © ISO 2016 – All rights reserved ISO 683 -2 : 01 6(E) I C S 7 ; 7 Price based on 40 pages © ISO 2016 – All rights reserved ; 7