ISO INTERNATIONAL STANDARD 4955 Fourthedition 2016-05-01 Heat-resistant steels Aciers réfractaires Referencenumber IS04955:2016(E) ISO Intemational Organization for Standardization 90=ZHEJIANG INST OF STANDARDIZATION C1 5956617 @IS02016 Not for Resale, 2016/7/20 08:16:16 No reproduction or networking permitted without license from IHS IS0 4955:2016(E) COPYRIGHTPROTECTEDDOCUMENT IS02016,PublishedinSwitzerland 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. +41 22 749 01 11 Fax+412274909 47 [email protected] www.iso.org Intenationai br PrganizationforStandardization icensee-ZHEJIANG INST OF STANDARDIZoISQ s.6 - All rights reserved I by IHS unde etworking permitted without license from IHS IS0 4955:2016(E) Contents Page Foreword ..iv 1 Scope 2 Normative references .1 3 Terms and definitions 4 Designation ..2 5 Information to be supplied by the purchaser ..2 6 Classification of grades .3 7 Requirements. .3 7.1 Manufacturing process ..3 7.2 Delivery condition .3 7.3 Chemical composition 4 7.4 Mechanical properties. .4 7.4.1 Mechanical properties at room temperature 4 7.4.2 Mechanical properties at elevated temperatures ..4 7.5 Surface quality. 4 7.6 Internalsoundness .5 7.7 Dimensions and tolerances on dimensions and shape .5 8 Inspection, testing and conformance of products .5 8.1 General .5 8.2 Inspection procedures and types of inspection documents. .6 8.3 Specific inspection and testing .6 8.3.1 Extent oftesting 8.3.2 Selection and preparation of samples and test pieces .6 8.4 Testmethods. .6 8.5 Retest ..7 9 Marking .7 Annex A (informative) Technical information on heat- and creep-resistant steels 21 Annex B (informative) Data for creep strength to 1 % plastic strain and creep rupture strength...28 Annex C (informative) Designations of the steels given in Table 2 and of comparable grades covered in various designation systems .33 Annex D (informative) Applicable dimensional International Standards. ..36 Bibliography .37 iii HEJIANG INST OF STANDARDIZATION C15956617 thout license from IHS