ISO INTERNATIONAL STANDARD 16540 First edition 2015-10-01 Corrosion of metals and alloys Methodology for determining the resistance of metals to stress corrosion cracking using the four- point bend method Corrosiondesmétauxetalliages-Methodologiededetermination de larésistancedesmetauxa lafissurationparcorrosion sous contrainteaumoyen dela methodedeflexion quatrepoints Reference number ISO16540:2015(E) ISO Intermational Organization for Standardization rdization5956617 IS02015 IS016540:2015(E) COPYRIGHTPROTECTEDDOCUMENT IS02015,Published inSwitzerland 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. ISOcopyrightoffice 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 Intematinaibr PrganizationfoStandardization networking permited without license from IHS Notfor Resale, 2015/11/30 07:14:16 IS016540:2015(E) Contents Page Foreword ..iv Introduction.. ..V 1 Scope. 2 Normative references ..1. 3 Terms and definitions ..1 4 Principle ..1 5 Loading jig design. .2 6 Specimenpreparation .3 6.1 General .3 6.2 Parent material specimens .3 6.3 Welded specimens .4 6.4 Clad product specimens ..5 7 Strain gauging .5 8 Loading ..6 8.1 Strain level .6 8.2 Setting the total strain value .6 8.3 Testing at elevated temperature ..8 9 Test environment .8 9.1 General .8 10 Procedure forfour-point bend testing 11 Failure appraisal .10 11.1Carbon steel .10 11.2 Corrosionresistant alloys .10 12 Testreport .11 AnnexA (informative) Surfacepreparation (seealsoIo7539-1) ..12 Annex B (informative) Procedure for strain gauging and determining uniaxial stress-strain calibration curve .16 Bibliography .18 iii Jardization5956617 thout license from IHS