ISO INTERNATIONAL STANDARD 3506-6 First edition 2020-04 Fasteners Mechanical properties of corrosion-resistant stainless steel fasteners Part 6: General rules for the selection of stainless steels and nickel alloys for fasteners Fixations-Caracteristiquesmecaniques des fixations en acier inoxydablerésistantala corrosion- Partie 6: Regles generales pour la selection des aciers inoxydables et desalliagesdenickel pourlesfixations Reference number IS0 3506-6:2020(E) ISO @ISO 2020 IS03506-6:2020(E) COPYRIGHTPROTECTEDDOCUMENT IS02020 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:+4122749 0111 Fax: +41 22 749 09 47 Email: copyright@iso.org Website: www.iso.org Published in Switzerland ii @ IS0 2020 - All rights reserved IS0 3506-6:2020(E) Contents Page Foreword ..iv Introduction .. 1 Scope. 2 Normativereferences 3 Termsanddefinitions 4 Groups and grades of stainless steels .2 4.1 .2 General 4.2 Stainless steel group A (austenitic structure) .2 4.2.1 General. 2 4.2.2 Grade A1 .3 4.2.3 Grade A2 3 4.2.4 Grade A3. .3 4.2.5 Grade A4. 3 4.2.6 Grade A5 .3 4.2.7 Grade A8 .3 4.3 Stainless steel group C (martensitic structure) .4 4.3.1 General .4 4.3.2 Grade C1 4 4.3.3 Grade C3 ..4 4.3.4 Grade C4 4 4.4 Stainless steel group F (ferritic structure) Grade F1 .4 4.5 StainlesssteelgroupD (austenitic-ferriticstructure) 4 4.5.1 .4 General. 4.5.2 Grades D2 and D4 .5 4.5.3 Grades D6 and D8. .5 4.6 Stainless steels andnickelalloysforelevated and hightemperatures. .5 5 Chemical composition specificationsforstainless steels and nickel alloys .5 6 Resistancetostresscorrosioncracking .8 7 Resistancetopittingand crevice corrosion .9 8 Resistance to intergranular corrosion .9 9 Susceptibilitytoformationofintermetalliccompounds ..11 10 Magnetic permeability properties of stainless steels .12 Annex A (informative) Commondesignations of stainless steels and nickelalloys used for fasteners .13 Bibliography .20 @ IS0 2020 - All rights reserved ili