1、Heat treatable steels, alloy steels and free-cutting steels Part 5: Nitriding steels BS ISO 6835:2017 BSI Standards Publication WB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06 ISO 2017 Heat treatable steels, alloy steels and free-cutting steels Part 5: Nitriding steels Aciers pour traitemen
2、t thermique, aciers allis et aciers pour dcolletage Partie 5: Aciers pour nitruration INTERNATIONAL STANDARD ISO 683-5 Second edition 2017-07 Reference number ISO 683-5:2017(E) National foreword This British Standard is the UK implementation of ISO 6835:2017. It supersedes BS ISO 6835:2014, which is
3、 withdrawn. The UK participation in its preparation was entrusted to Technical Committee ISE/105, Steels for Heat Treatment, Alloy Steels, Free Cutting Steels and Stainless Steels. A list of organizations represented on this committee can be obtained on request to its secretary. This publication doe
4、s not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2017 Published by BSI Standards Limited 2017 ISBN 978 0 580 97837 1 ICS 77.140.20; 77.140.10 Compliance with a British Standard cannot confer immu
5、nity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2017. Amendments/corrigenda issued since publication Date Text affected BRITISH STANDARD BS ISO 6835:2017 ISO 2017 Heat treatable steels, alloy steels and fr
6、ee-cutting steels Part 5: Nitriding steels Aciers pour traitement thermique, aciers allis et aciers pour dcolletage Partie 5: Aciers pour nitruration INTERNATIONAL STANDARD ISO 683-5 Second edition 2017-07 Reference number ISO 683-5:2017(E) BS ISO 6835:2017 ISO 683-5:2017(E)ii ISO 2017 All rights re
7、served COPYRIGHT PROTECTED DOCUMENT ISO 2017, 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 photocopying, or posting on the internet or an
8、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 22 749 01 11 Fax +41 22 749 09 47 copyrighti
9、so.org www.iso.org BS ISO 6835:2017 ISO 683-5:2017(E)ii ISO 2017 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2017, 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, elect
10、ronic 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 ISOs member body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 CP 401 CH-1214 Vern
11、ier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyrightiso.org www.iso.orgISO 683-5:2017(E)Foreword v 1 Scope . 1 2 Normative references 1 3 T erms and definitions . 2 4 Classification and designation . 3 4.1 Classification . 3 4.2 Designation 3 5 Information to be supplied by
12、the purchaser. 3 5.1 Mandatory information . 3 5.2 Options/supplementary or special requirements 3 5.3 Ordering example . 4 6 Manufacturing process 4 6.1 General . 4 6.2 Deoxidization . 4 6.3 Heat treatment and surface condition at delivery 4 6.3.1 Normal condition at delivery 4 6.3.2 Particular hea
13、t-treatment condition . 4 6.3.3 Particular surface conditions 4 6.4 Traceability of the cast . 4 7 Requirements 4 7.1 Chemical composition, hardness and mechanical properties 4 7.1.1 General 4 7.1.2 Chemical composition . 5 7.1.3 Mechanical properties 5 7.2 Machinability 5 7.3 Cold shearability 5 7.
14、4 Grain size 5 7.5 Non-metallic inclusions . 5 7.5.1 Microscopic inclusions . 5 7.5.2 Macroscopic inclusions 5 7.6 Internal soundness 5 7.7 Surface quality . 5 7.8 Decarburization . 6 7.9 Shape, dimensions and tolerances . 6 8 Inspection 6 8.1 Testing procedures and types of documents 6 8.2 Frequenc
15、y of testing . 7 8.3 Specific inspection and testing 7 8.3.1 Verification of the hardness and mechanical properties 7 8.3.2 Visual and dimensional inspection 7 9 Test methods . 7 9.1 Chemical analysis 7 9.2 Hardness and mechanical tests 7 9.2.1 Hardness . 7 9.2.2 Mechanical tests . 7 9.2.3 Impact te
16、st . 7 9.3 Retests 8 10 Marking 8 Annex A (normative) Ruling sections for mechanical properties .18 Annex B (normative) Supplementary or special requirements 22 ISO 2017 All rights reserved iii Contents Page BS ISO 6835:2017 ISO 683-5:2017(E)Annex C (informative) Designation of steels given in this
17、document and of comparable grades covered in various designation systems24 Annex D (informative) Dimensional standards applicable to products complying with this document .25 Bibliography .26 iv ISO 2017 All rights reserved BS ISO 6835:2017 ISO 683-5:2017(E)Annex C (informative) Designation of steel
18、s given in this document and of comparable grades covered in various designation systems24 Annex D (informative) Dimensional standards applicable to products complying with this document .25 Bibliography .26 iv ISO 2017 All rights reserved ISO 683-5:2017(E) Foreword ISO (the International Organizati
19、on for Standardization) 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 ha
20、s 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 of electrotechnical standardization. The
21、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 different types of ISO documents should be noted. This document was drafted in accordance with the edi
22、torial rules of the 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
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24、r an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www
25、.iso .org/ iso/ foreword .html. This document was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 4, Heat treatable and alloy steels. This second edition cancels and replaces the first edition (ISO 683-5:2014), of which it constitutes a minor revision. The main changes compared to
26、the previous edition are as follows: in the Scope, “see 5.2” has been added as a cross reference; in 3.1, note 1 to entry has been revised; in 5.2, the ordering example has been moved into a new subclause, as 5.3; in 7.7.3, the surface class given has been changed from A to 1z2; in 9.2.3, the option
27、 for retesting has been revised; Figure 3 has been renamed as Table 9; in A.2.1, the cross references have been corrected to A.2.2 to A.2.4. A list of all parts in the ISO 683 series can be found on the ISO website. ISO 2017 All rights reserved v BS ISO 6835:2017BS ISO 6835:2017 Heat treatable steel
28、s, alloy steels and free-cutting steels Part 5: Nitriding steels 1 Scope This document gives the technical delivery requirements for semi-finished products, e.g. blooms, billets, slabs (see note 1), bars (see note 1), wire rod, hot-rolled plates (see note 2), and hammer or drop forgings (see note 1)
29、 manufactured from the nitriding steels listed in Table 3 and supplied in one of the heat-treatment conditions given for the different types of products in Table 1, rows 2 to 5, and in one of the surface conditions given in Table 2. The steels are generally intended for the fabrication of quenched a
30、nd tempered and, subsequently, nitriding machine parts. The requirements for mechanical properties given in this document are restricted to the sizes given in Table 6. NOTE 1 Hammer-forged semi-finished products (blooms, billets, slabs, etc.), seamless rolled rings and hammer-forged bars are in the
31、following covered under semi-finished products or bars and not under the term “hammer and drop forgings”. NOTE 2 The term “plate” includes in the following also wide flats unless otherwise stated. In special cases, variations in these technical delivery requirements or additions to these requirement
32、s can form the subject of an agreement at the time of enquiry and order (see 5.2 and Annex B). In addition to this document, the general technical delivery requirements of ISO 404 are applicable. 2 Normative references The following documents are referred to in the text in such a way that some or al
33、l of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 148-1, Metallic materials Charpy pendulum impact test Part 1: Test method
34、ISO 377, Steel and steel products Location and preparation of samples and test pieces for mechanical testing ISO 404:2013, Steel and steel products General technical delivery requirements ISO 643, Steels Micrographic determination of the apparent grain size ISO 3887, Steels Determination of depth of
35、 decarburization ISO 4885, Ferrous materials Heat treatments Vocabulary INTERNATIONAL ST ANDARD ISO 683-5:2017(E) ISO 2017 All rights reserved 1 BS ISO 6835:2017 ISO 683-5:2017(E) ISO 4948-1, Steels Classification Part 1: Classification of steels into unalloyed and alloy steels based on chemical com
36、position 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 Micr
37、ographic method using standard diagrams ISO 6506-1, Metallic materials Brinell hardness test Part 1: Test method 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
38、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/TR 9769, Steel and iron Review of available methods of analysis ISO 10474, Steel and steel products Inspection documents ISO 14284,
39、Steel and iron Sampling and preparation of samples for the determination of chemical composition 3 T erms an d definiti ons For the purposes of this document, the terms and definitions given in ISO 377, ISO 4885, ISO 4948-1, ISO 4948-2, ISO 6929 and ISO 14284 and the following apply. ISO and IEC mai
40、ntain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at h t t p :/ www .electropedia .org/ ISO Online browsing platform: available at h t t p :/ www .iso .org/ obp 3.1 ruling section section for which the specified mechanical properties sh
41、all apply Note 1 to entry: Independent of the actual shape and dimensions of the cross-section of the product, the size of its ruling section is always given by a diameter. This corresponds to the diameter of an “equivalent round bar”. That is a round bar which will show the same cooling rate as the
42、 actual ruling section of the product concerned at its position for taking the test pieces when being cooled from austenitizing temperature. 3.2 nitriding steel heat-treatable steel containing controlled amounts of the nitride forming elements, aluminium, chromium, molybdenum and/or vanadium and are
43、 particularly suited for nitriding 3.3 nitriding heat treatment characterized by keeping a steel product for a sufficiently long time at temperatures below the transformation temperature AC1 in a nitrogen providing gaseous or liquid salt environment to achieve diffusion of the nitrogen into the stee
44、l surface Note 1 to entry: An increase in surface hardness, wear resistance and fatigue properties is attained with this treatment.2 ISO 2017 All rights reserved BS ISO 6835:2017 ISO 683-5:2017(E) ISO 4948-1, Steels Classification Part 1: Classification of steels into unalloyed and alloy steels base
45、d 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-metalli
46、c inclusions Micrographic method using standard diagrams ISO 6506-1, Metallic materials Brinell hardness test Part 1: Test method 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
47、 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/TR 9769, Steel and iron Review of available methods of analysis ISO 10474, Steel and steel products Inspection docu
48、ments ISO 14284, Steel and iron Sampling and preparation of samples for the determination of chemical composition 3 T erms an d definiti ons For the purposes of this document, the terms and definitions given in ISO 377, ISO 4885, ISO 4948-1, ISO 4948-2, ISO 6929 and ISO 14284 and the following apply
49、. ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at h t t p :/ www .electropedia .org/ ISO Online browsing platform: available at h t t p :/ www .iso .org/ obp 3.1 ruling section section for which the specified mechanical properties shall apply Note 1 to entry: Independent of the actual shape and dimensions of the cro
