ISO/TR TECHNICAL REPORT 20172 Third edition 2021-04 Welding Grouping systems for materials European materials Soudage - Systemes de groupement des matériaux - Matériaux europeens Reference number IS0/TR 20172:2021(E) so Copyright International Organization for Standardization @IS02021 IS0/TR 20172:2021(E) COPYRIGHTPROTECTEDDOCUMENT IS02021 All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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 below or Iso's member body in the country of the requester. IsO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Email: [email protected] Website: www.iso.org Published in Switzerland Copyigh ileratinal Organization for Standardization @ IS0 2021 - All rights reserved