ISO INTERNATIONAL STANDARD 683-4 Second edition 2016-07-15 Heat-treatable steels, alloy steels and free-cutting steels - Part 4: Free-cutting steels Aciers pour traitement thermique, aciers alliés et aciers pour décolletage - Partie 4: Aciers pour décolletage Reference number IS0 683-4:2016(E) ISO @ISO2016 IS0 683-4:2016(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2016, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form 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 copyrightoffice Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 [email protected] www.iso.org ii @ IS0 2016 - All rights reserved IS0 683-4:2016(E) Contents Page Foreword ..iv 1 Scope .1 2 Normative references ..1 3 Terms and definitions 4 Classification and designation .2 4.1 Classification .2 4.2 Designation .2 5 Information to be supplied by the purchaser .2 5.1 Mandatory information. 2 5.2 Options/supplementary or special requirements. .3 5.3 Ordering example. 3 6 Manufacturing process .3 6.1 General 3 6.2 Heat treatment and surface condition at delivery 3 6.2.1 Normal conditionatdelivery .3 6.2.2 Particular heat-treatment condition 3 6.3 Traceability of the cast. 3 7 Requirements .4 7.1 Chemical composition, hardness, and mechanical properties 4 7.1.1 General .4 7.1.2 Chemical composition .4 7.1.3 Mechanical properties .4 7.2 Machinability ..4 7.3 Weldability .4 7.4 Grain size. .4 7.5 Internal soundness 4 7.6 Surface quality. 7.7 Shape, dimensions, and tolerances ..5 8 Inspection .5 8.1 Testing procedures and types of documents ..5 8.2 Frequency of testing .6 8.3 Specific inspection and testing .6 8.3.1 Verification of the hardness and mechanical properties .6 8.3.2 Visual and dimensional inspection .6 9 Test methods. .6 9.1 Chemical analysis. .6 9.2 Hardness and mechanical tests .6 9.2.1 Hardness. .6 9.2.2 Mechanical tests .6 9.3 Retests ..6 10 Marking Annex A (normative) Ruling sections for mechanical properties ..14 Annex B (normative) Supplementary or special requirements .17 Annex C (informative) Designation of steels given in this part of Is0 683 and of comparable grades covered in various designation systems. 19 Annex D (informative) Dimensional standards applicable to products complying with this part of Is0 683 .20 Bibliography .21 @ IS0 2016 - All rights reserved iii