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1 INTERNATIONAL STANDARD ISO Second edition 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
2 ISO 683-2:2016(E) 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 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 of the requester. ISO copyright office Ch. de Blandonnet 8 CP 401 CH-1214 Vernier, Geneva, Switzerland Tel Fax ii ISO 2016 All rights reserved
3 ISO 683-2:2016(E) Contents Page Foreword...v 1 Scope Normative references Terms and definitions Classification and designation Classification Designation Information to be supplied by the purchaser Mandatory information Options and/or supplementary or special requirements Ordering example Manufacturing process General Deoxidation Heat-treatment condition and surface condition at delivery Heat-treatment condition Particular surface conditions Traceability of the cast Requirements Chemical composition, mechanical properties and hardenability General Chemical composition Mechanical properties Hardenability Surface hardness Machinability Cold shearability Grain size Non-metallic inclusions Microscopic inclusions Macroscopic inclusions Internal soundness Surface quality Decarburization Shape, dimensions and tolerances Inspection Testing procedures and types of documents Frequency of testing Specific inspection and testing Verification of the hardenability, hardness and mechanical properties Visual and dimensional inspection Test methods Chemical analysis Mechanical tests Tensile test Impact test Hardness and hardenability tests Hardness in treatment conditions +A and +S Verification of hardenability Surface hardness Retests... 9 ISO 2016 All rights reserved iii
4 ISO 683-2:2016(E) 10 Marking... 9 Annex A (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 grades covered in various designation systems...37 Annex D (informative) Dimensional standards applicable to products complying with this part of ISO Bibliography...40 iv ISO 2016 All rights reserved
5 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 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 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 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 editorial rules of the ISO/IEC Directives, Part 2 (see 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 during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see 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 meaning of ISO specific terms and expressions related to conformity 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: 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), of 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
7 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 This part of ISO 683 specifies the technical delivery requirements for 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 direct hardening alloy steels and the alloy flame- and induction-hardening steels listed in Table 3 and supplied in one of the heat-treatment conditions 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 quenched and tempered or austempered (see 3.2 and Note 2) and flame- or induction-hardened machine parts (see 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. 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 For the purposes of simplification, the term quenched and tempered is, unless otherwise indicated, used in the following also for the austempered condition. NOTE 3 For International Standards relating to steels complying with the requirements for the chemical composition in Table 3, however, supplied in other product forms or treatment conditions than given above or intended for special applications, and for other related International Standards, see the Bibliography. NOTE 4 This part of ISO 683 does not apply to bright products and bars and wire rod for cold heading. For such products, see ISO and ISO In special cases, variations in these technical delivery requirements or additions to them can form the subject of an agreement at the time of enquiry and order (see 5.2 and Annex B). 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 for its application. 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 ISO 2016 All rights reserved 1
8 ISO 683-2:2016(E) 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 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 , Steels Classification Part 1: Classification of steels into unalloyed and alloy steels based on chemical composition ISO , 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 , Metallic materials Brinell hardness test Part 1: Test method ISO , Metallic materials Rockwell hardness test Part 1: Test method (scales A, B, C, D, E, F, G, H, K, N, T) ISO , 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 purposes of this document, the definitions in ISO 377, ISO 4885, ISO , ISO , ISO 6929, ISO 14284, and the following apply. NOTE For deviations from these terms and definitions, see Notes 1 and 2 of Clause ruling section section for which the specified mechanical properties shall 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 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: ISO 2016 All rights reserved
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