1、 ISO 2016 Heat-treatable steels, alloy steels and free-cutting steels Part 3: Case-hardening steels Aciers pour traitement thermique, aciers allis et aciers pour dcolletage Partie 3: Aciers pour cmentation INTERNATIONAL STANDARD ISO 683-3 Second edition 2016-07-15 Reference number ISO 683-3:2016(E)
2、ISO 683-3:2016(E)ii ISO 2016 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2016, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photo
3、copying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22
4、 749 01 11 Fax +41 22 749 09 47 copyrightiso.org www.iso.org ISO 683-3:2016(E)Foreword v 1 Scope . 1 2 Normative references 1 3 T erms and definitions . 2 4 Classification and designation . 2 4.1 Classification . 2 4.2 Designation 3 5 Information to be supplied by the purchaser. 3 5.1 Mandatory info
5、rmation . 3 5.2 Options and/or supplementary or special requirements 3 5.3 Ordering example . 3 6 Manufacturing process 4 6.1 General . 4 6.2 Deoxidation 4 6.3 Heat-treatment condition and surface condition at delivery . 4 6.3.1 Normal condition at delivery 4 6.3.2 Particular heat-treatment conditio
6、n . 4 6.3.3 Particular surface conditions 4 6.4 Traceability of the cast . 4 7 Requirements 4 7.1 Chemical composition, hardness and hardenability 4 7.1.1 General 4 7.1.2 Chemical composition . 5 7.2 Machinability 5 7.3 Cold shearability 5 7.4 Grain size 5 7.5 Non-metallic inclusions . 5 7.5.1 Micro
7、scopic inclusions . 5 7.5.2 Macroscopic inclusions 5 7.6 Internal soundness 6 7.7 Surface condition 6 7.8 Shape, dimensions and tolerances . 6 8 Inspection 6 8.1 Testing procedures and types of documents 6 8.2 Frequency of testing . 7 8.3 Tests to be carried out for specific inspection . 7 8.3.1 Gen
8、eral 7 8.3.2 Visual and dimensional inspection 7 9 Test methods . 7 9.1 Chemical analysis 7 9.2 Hardness and hardenability tests . 7 9.2.1 Verification of hardness . 7 9.2.2 Verification of hardenability 7 9.3 Retests 8 10 Marking 8 Annex A (normative) Supplementary or special requirements 29 Annex
9、B (informative) Designation of steels given in this part of ISO 683 and of comparable grades covered in various designation systems31 ISO 2016 All rights reserved iii Contents Page ISO 683-3:2016(E)Annex C (informative) Dimensional standards applicable to products complying with this part of ISO 683
10、 .33 Annex D (informative) Classification of st eel gr ades ac c or ding t o minimum t ensile str ength as a function of diameter after hardening and tempering at 200 C .34 Bibliography .35 iv ISO 2016 All rights reserved ISO 683-3:2016(E) Foreword ISO (the International Organization for Standardiza
11、tion) is a worldwide federation of national standards bodies (ISO member bodies). The work of 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
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14、e ISO/IEC Directives, Part 2 (see www.iso.org/directives). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified du
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17、his document is ISO/TC 17, Steel, Subcommittee SC 4, Heat-treatable and alloy steels. This second edition cancels and replaces the first edition (ISO 683-3:2014), of which it constitutes a minor revision. ISO 683 consists of the following parts, under the general title Heat-treatable steels, alloy s
18、teels and free- cutting 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
19、for internal combustion engines Part 17: Ball and roller bearing steels Part 18: Bright steel products ISO 2016 All rights reserved v Heat-treatable steels, alloy steels and free-cutting steels Part 3: Case-hardening steels 1 Scope This part of ISO 683 specifies the technical delivery requirements f
20、or semi-finished products, hot formed, e.g. blooms, billets, slabs (see Note 1), bars (see Note 1), wire rod, finished flat products, and hammer or drop forgings (see Note 1) manufactured from the case-hardening non-alloy or alloy steels listed in Table 3 and supplied in one of the heat-treatment co
21、nditions given for the different types 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 case-hardened (see 3.1) machine parts. NOTE 1 Hammer-forged semi-finished products (blooms, billets, slabs, etc.), seamless
22、 rolled rings and hammer-forged bars are covered under semi-finished products or bars and not under the term “hammer and drop forgings”. NOTE 2 For International Standards relating to steels complying with the requirements for the chemical composition in Table 3, however, supplied in other product f
23、orms or treatment conditions than given above or intended for special applications, and for other related International Standards, see the Bibliography. In special cases, variations in these technical delivery requirements or additions to them can form the subject of an agreement at the time of enqu
24、iry and order (see 5.2 and Annex A). In addition to this part of ISO 683, the general technical delivery requirements of ISO 404 are applicable. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable to its application.
25、For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 377, Steel and steel products Location and preparation of samples and test pieces for mechanical testing ISO 404, Steel and steel produc
26、ts General technical delivery requirements ISO 642:1999, Steel Hardenability test by end quenching (Jominy test) ISO 643, Steels Micrographic determination of the apparent grain size ISO 4885, Ferrous products Heat treatments Vocabulary ISO 4948-1, Steels Classification Part 1: Classification of ste
27、els into unalloyed and alloy steels based on chemical composition INTERNATIONAL ST ANDARD ISO 683-3:2016(E) ISO 2016 All rights reserved 1 ISO 683-3:2016(E) ISO 4948-2, Steels Classification Part 2: Classification of unalloyed and alloy steels according to main quality classes and main property or a
28、pplication characteristics 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,
29、C, D, E, F, G, H, K, N, T) 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, S
30、teel and steel products Inspection documents ISO 14284, Steel and iron Sampling and preparation of samples for the determination of chemical composition ISO/TR 9769, Steel and iron Review of available methods of analysis ISO/TS 4949, Steel names based on letter symbols 3 T erms a nd definiti ons For
31、 the purposes of this document, the definitions of ISO 377, ISO 4885, ISO 4948-1, ISO 4948-2, ISO 6929, ISO 14284 and the following apply. NOTE For deviations from these terms and definitions, see Note 1 of the Scope and footnote a of Table 2. 3.1 case-hardening steels structural steels with a relat
32、ively low carbon content, which are carburized or carbonitrided on their surface and subsequently hardened Note 1 to entry: These steels, after hardening, have a high degree of hardness in the surface zone and good resistance to wear, while the core material is characterized principally by extreme t
33、oughness. Note 2 to entry: Further, possibilities for heat treatment of case-hardening steels are, for example, nitrocarburizing and nitriding. 3.2 non-alloy steel as defined in ISO 4948-1 3.3 alloy steel as defined in ISO 4948-1 4 Classific ation and designation 4.1 Classification The classificatio
34、n of the relevant steel grades is according to ISO 4948-1 and ISO 4948-2. Steel grades C10E, C10R, C15E, C15R, C16E, C16R and 22Mn6 are non-alloy special steels. All other steel grades covered by this part of ISO 683 are alloy special steels.2 ISO 2016 All rights reserved ISO 683-3:2016(E) 4.2 Desig
35、nation For the steel grades covered by this part of ISO 683, the steel names as given in the relevant tables are allocated in accordance with ISO/TS 4949. 5 Information to be supplied by the purchaser 5.1 Mandatory information The following information shall be supplied by the purchaser at the time
36、of enquiry and order: a) quantity to be delivered; b) designation of the product form (slab, bloom, billet, round bar or square bar, wire rod, wide flats, sheet, plate, strip, forging, etc.); c) either the designation of the dimensional standard and the dimensions and tolerances selected from this (
37、see 7.8) 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) a reference to this part of ISO 683, i.e. ISO 683-3; e) the designation of the steel type given in Table 3; f) standard des
38、ignation for a test report 2.2 or, if required, any other type of 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 A number of options are specified in this Internationa
39、l Standard and listed below. If the purchaser does not indicate the wish to implement any of these options, the products will be supplied in accordance with the basic specifications of this part of ISO 683 (see 5.1): a) if a heat-treatment condition other than the untreated condition is required, th
40、e symbol for this other condition (see Table 1, column 2); b) if a surface condition other than “hot worked” or a special surface quality is required, the surface condition (see Table 2) and the surface quality (see 7.7.3); c) any requirement for restricted hardenability scatter bands for alloy stee
41、ls (+HH, +HL; see 7.1.1, Table 6 and Figure 1); d) if any supplementary requirement shall be complied with, the symbol and, where necessary, the details of this supplementary requirement (see Annex A); e) any requirement for the verification of non-metallic inclusion content (see 7.5); f) verificati
42、on of hardenability and, if agreed, the information about calculation of the hardenability (see 9.2.2); g) any requirement concerning suitability of bars and rod for bright drawing (see 7.7.4); h) any requirement relating to removal of surface defects (see 7.7.5). 5.3 Ordering example EXAMPLE 50 hot
43、-rolled round bars in accordance with ISO 1035-1 with a nominal diameter of 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 683-3, 20MnCr5 (see Table 3) in the heat-treatment con
44、dition annealed (+A), surface blast cleaned (+BC) (see Table 2), product analysis/option A.3 with an inspection certificate 3.1 in accordance with ISO 10474. ISO 2016 All rights reserved 3 ISO 683-3:2016(E)50 Round bars ISO 1035 40,0S 8 000L2ISO 683-3 20MnCr5+A+BC, Option A.3ISO 10474 3.1 6 Manufact
45、uring process 6.1 General The manufacturing process of the steel and of 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 A.
46、4. 6.2 Deoxidation All steels shall be deoxidized. 6.3 Heat-treatment condition and surface condition at delivery 6.3.1 Normal condition at delivery Unless otherwise agreed at the time of enquiry and order, the products shall be delivered in the untreated condition, i.e. hot-worked condition. 6.3.2
47、Particular heat-treatment condition If so agreed at the time of enquiry and order, the products shall be delivered in one of the heat-treatment conditions given in Table 1, lines 3 to 8. 6.3.3 Particular surface conditions If so agreed at the time of enquiry and order, the products shall be delivere
48、d in one of the particular surface conditions given in Table 2, lines 3 to 6. 6.4 Traceability of the cast The products shall be traceable to the cast, see Clause 10. 7 Requirements 7.1 Chemical composition, hardness and hardenability 7.1.1 General Table 1 gives a survey on combinations of usual hea
49、t-treatment conditions at delivery, product forms and requirements as specified in Tables 3 to 7 (chemical composition, hardenability, maximum hardness and hardness range). Unless otherwise agreed for alloy steels, the hardenability requirements given in Table 5 apply. If agreed at the time of enquiry and order, alloy steels with restricted hardenability scatter bands given in Table 6 or shown in Figure 1 shall be supplied.4 ISO 2016 All rights reserved ISO 683-3:
