1、Heat treatable steels, alloy steels and free-cutting steelsPart 5: Nitriding steelsBS ISO 6835:2017BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06 ISO 2017Heat treatable steels, alloy steels and free-cutting steels Part 5:Nitriding steelsAciers pour traitement therm
2、ique, aciers allis et aciers pour dcolletage Partie 5: Aciers pour nitrurationINTERNATIONALSTANDARDISO683-5Second edition2017-07Reference numberISO 683-5:2017(E)National forewordThis British Standard is the UK implementation of ISO 6835:2017. It supersedes BS ISO 6835:2014, which is withdrawn.The UK
3、 participation in its preparation was entrusted to Technical Committee ISE/105, Steels for Heat Treatment, Alloy Steels, FreeCutting Steels and Stainless Steels.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to incl
4、ude all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2017 Published by BSI Standards Limited 2017ISBN 978 0 580 97837 1ICS 77.140.20; 77.140.10Compliance with a British Standard cannot confer immunity from legal obligati
5、ons.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2017.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS ISO 6835:2017 ISO 2017Heat treatable steels, alloy steels and free-cutting steels Part 5: Nitr
6、iding steelsAciers pour traitement thermique, aciers allis et aciers pour dcolletage Partie 5: Aciers pour nitrurationINTERNATIONAL STANDARDISO683-5Second edition2017-07Reference numberISO 683-5:2017(E)BS ISO 6835:2017ISO 683-5:2017(E)ii ISO 2017 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2
7、017, Published in SwitzerlandAll 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 intranet, without prior written permission
8、. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 6835:2017ISO 683-5:2017(
9、E)ii ISO 2017 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2017, Published in SwitzerlandAll 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 posti
10、ng 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 officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22
11、749 09 47copyrightiso.orgwww.iso.orgISO 683-5:2017(E)Foreword v1 Scope . 12 Normative references 13 Terms and definitions . 24 Classification and designation . 34.1 Classification . 34.2 Designation 35 Information to be supplied by the purchaser. 35.1 Mandatory information . 35.2 Options/supplementa
12、ry or special requirements 35.3 Ordering example . 46 Manufacturing process 46.1 General . 46.2 Deoxidization . 46.3 Heat treatment and surface condition at delivery 46.3.1 Normal condition at delivery 46.3.2 Particular heat-treatment condition . 46.3.3 Particular surface conditions 46.4 Traceabilit
13、y of the cast . 47 Requirements 47.1 Chemical composition, hardness and mechanical properties 47.1.1 General 47.1.2 Chemical composition . 57.1.3 Mechanical properties 57.2 Machinability 57.3 Cold shearability 57.4 Grain size 57.5 Non-metallic inclusions . 57.5.1 Microscopic inclusions . 57.5.2 Macr
14、oscopic inclusions 57.6 Internal soundness 57.7 Surface quality . 57.8 Decarburization . 67.9 Shape, dimensions and tolerances . 68 Inspection 68.1 Testing procedures and types of documents 68.2 Frequency of testing . 78.3 Specific inspection and testing 78.3.1 Verification of the hardness and mecha
15、nical properties 78.3.2 Visual and dimensional inspection 79 Test methods . 79.1 Chemical analysis 79.2 Hardness and mechanical tests 79.2.1 Hardness . 79.2.2 Mechanical tests . 79.2.3 Impact test . 79.3 Retests 810 Marking 8Annex A (normative) Ruling sections for mechanical properties .18Annex B (n
16、ormative) Supplementary or special requirements 22 ISO 2017 All rights reserved iiiContents PageBS ISO 6835:2017ISO 683-5:2017(E)Annex C (informative) Designation of steels given in this document and of comparable grades covered in various designation systems24Annex D (informative) Dimensional stand
17、ards applicable to products complying with this document .25Bibliography .26iv ISO 2017 All rights reservedBS ISO 6835:2017ISO 683-5:2017(E)Annex C (informative) Designation of steels given in this document and of comparable grades covered in various designation systems24Annex D (informative) Dimens
18、ional standards applicable to products complying with this document .25Bibliography .26iv ISO 2017 All rights reserved ISO 683-5:2017(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing I
19、nternational 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
20、 with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directi
21、ves, 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 editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).Attention is drawn to the possibility that so
22、me 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 during the development of the document will be in the Introduction and/or on the ISO list of patent declar
23、ations received (see www .iso .org/ patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity
24、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 .iso .org/ iso/ foreword .html.This document was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 4, Heat trea
25、table 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 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
26、 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 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
27、 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 vBS ISO 6835:2017BS ISO 6835:2017Heat treatable steels, alloy steels and free-cutting steels Part 5: Nitriding steels1 ScopeThis document gives the technical delivery requirements for se
28、mi-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)manufactured from the nitriding steels listed in Table 3 and supplied in one of the heat-treatment conditions given for the different t
29、ypes 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 and tempered and, subsequently, nitriding machine parts.The requirements for mechanical properties given in this document are restricted t
30、o 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 following covered under semi-finished products or bars and not under the term “hammer and drop forgings”.NOTE 2 The term “plate” includes i
31、n the following also wide flats unless otherwise stated.In special cases, variations in these technical delivery requirements or additions to these requirements 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 techn
32、ical delivery requirements of ISO 404 are applicable.2 Normative referencesThe following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the
33、latest edition of the referenced document (including any amendments) applies.ISO 148-1, Metallic materials Charpy pendulum impact test Part 1: Test methodISO 377, Steel and steel products Location and preparation of samples and test pieces for mechanical testingISO 404:2013, Steel and steel products
34、 General technical delivery requirementsISO 643, Steels Micrographic determination of the apparent grain sizeISO 3887, Steels Determination of depth of decarburizationISO 4885, Ferrous materials Heat treatments VocabularyINTERNATIONAL STANDARD ISO 683-5:2017(E) ISO 2017 All rights reserved 1BS ISO 6
35、835:2017ISO 683-5:2017(E)ISO 4948-1, Steels Classification Part 1: Classification of steels into unalloyed and alloy steels based on chemical compositionISO 4948-2, Steels Classification Part 2: Classification of unalloyed and alloy steels according to main quality classes and main property or appli
36、cation characteristicsISO/TS 4949, Steel names based on letter symbolsISO 4967, Steel Determination of content of non-metallic inclusions Micrographic method using standard diagramsISO 6506-1, Metallic materials Brinell hardness test Part 1: Test methodISO 6892-1, Metallic materials Tensile testing
37、Part 1: Method of test at room temperatureISO 6929, Steel products VocabularyISO 7788, Steel Surface finish of hot-rolled plates and wide flats Delivery requirementsISO 9443, Heat-treatable and alloy steels Surface quality classes for hot-rolled round bars and wire rods Technical delivery conditions
38、ISO/TR 9769, Steel and iron Review of available methods of analysisISO 10474, Steel and steel products Inspection documentsISO 14284, Steel and iron Sampling and preparation of samples for the determination of chemical composition3 Terms and definitionsFor the purposes of this document, the terms an
39、d 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 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
40、platform: available at h t t p :/ www .iso .org/ obp3.1ruling sectionsection for which the specified mechanical properties shall applyNote 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. Thi
41、s corresponds to the diameter of an “equivalent round bar”. That 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.3.2nitriding steelheat-treatable ste
42、el containing controlled amounts of the nitride forming elements, aluminium, chromium, molybdenum and/or vanadium and are particularly suited for nitriding3.3nitridingheat treatment characterized by keeping a steel product for a sufficiently long time at temperatures below the transformation tempera
43、ture AC1 in a nitrogen providing gaseous or liquid salt environment to achieve diffusion of the nitrogen into the steel surfaceNote 1 to entry: An increase in surface hardness, wear resistance and fatigue properties is attained with this treatment.2 ISO 2017 All rights reservedBS ISO 6835:2017ISO 68
44、3-5:2017(E)ISO 4948-1, Steels Classification Part 1: Classification of steels into unalloyed and alloy steels based on chemical compositionISO 4948-2, Steels Classification Part 2: Classification of unalloyed and alloy steels according to main quality classes and main property or application charact
45、eristicsISO/TS 4949, Steel names based on letter symbolsISO 4967, Steel Determination of content of non-metallic inclusions Micrographic method using standard diagramsISO 6506-1, Metallic materials Brinell hardness test Part 1: Test methodISO 6892-1, Metallic materials Tensile testing Part 1: Method
46、 of test at room temperatureISO 6929, Steel products VocabularyISO 7788, Steel Surface finish of hot-rolled plates and wide flats Delivery requirementsISO 9443, Heat-treatable and alloy steels Surface quality classes for hot-rolled round bars and wire rods Technical delivery conditionsISO/TR 9769, S
47、teel and iron Review of available methods of analysisISO 10474, Steel and steel products Inspection documentsISO 14284, Steel and iron Sampling and preparation of samples for the determination of chemical composition3 Terms and definitionsFor the purposes of this document, the terms and definitions
48、given in ISO 377, ISO 4885, ISO 4948-1, ISO 4948-2, ISO 6929 and ISO 14284 and the following apply.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: avai
49、lable at h t t p :/ www .iso .org/ obp3.1ruling sectionsection for which the specified mechanical properties shall applyNote 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 actual ru
