ISO INTERNATIONAL STANDARD 3506-4 Second edition 2009-11-15 Mechanical properties of corrosion- resistant stainless steel fasteners Part 4: Tapping screws Caracteristiques mecaniques des élementsdefixation en acier inoxydablerésistantalacorrosion- Partie 4: Vis a tole Reference number ISO 3506-4:2009(E) @ISO 2009 Copyright Intemational Organization for Standardization 25:04 MST ISO3506-4:2009(E) PDFdisclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHTPROTECTEDDOCUMENT ISO2009 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, Iso's member body in the country of the requester. ISO copyright office Case postale 56· CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ ISO 2009 - All rights reserved ISO3506-4:2009(E) Contents Page Foreword iv Introductior 1 Scope 2 Normative reference 3 Designation, marking and finish... 3.1 Designation. 3.2 Marking. 3.3 Finish... 4 Chemical composition 5 Mechanicalproperties 5.1 General 5.2 Surface hardness 5.3 Core hardness 5.4 Torsional strength 5.5 Thread forming capability... 6 Testmethods... 6.1 Surface hardness test. 6.2 6 6.3 Torsional strength test. 6.4 Drive test... Annex A (normative)Description of the groups and grades of stainless steels .... AnnexB (informative)Stainless steel for cold heading and extruding... 12 Annex C (informative)Austenitic stainless steelswithparticular resistance to chloride induced stresscorrosion...... 14 Annex D (informative)Time-temperature diagram of intergranular corrosion in austenitic stainless stels, grade A2 (1..8 stels............. AnnexE(informative)Magneticpropertiesforaustenitic stainlesssteels 16 Bibliography. ii Bodies ISO3506-4:2009(E) Foreword ISso (the International Organization for Standardization) is a worldwide federation of national standards bodies (isOmemberbodies).TheworkofpreparingInternationalStandardsisnormallycarriedoutthroughISo International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2. adoptedbythetechnical committees arecirculatedtothememberbodiesfor voting.Publicationas an International Standard requires approval by at least 75% of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. IsO shall not be held responsible for identifying any or all such patent rights. ISO3506-4wasprepared byTechnicalCommitteeISO/TC2,Fasteners,SubcommitteeSC1,Mechanical properties offasteners. This second edition cancels and replaces the first edition (isO 3506-4:2003), which has been technically revised. Iso 3506 consists of the following parts, under the general title Mechanical properties of corrosion-resistant stainlesssteelfasteners Part1:Bolts, screws andstuds Part 2: Nuts Part 3:Set screws and similarfasteners notundertensile stress Part 4:Tapping screws @ ISo 2009 All rights reserved ational Organization for Standardizatior ISO 3506-4:2009(E) Introduction property characteristics of the stainless steel fastener grades compared with those of carbon steel and consequently,the components do not have as homogeneous local material properties as hardened and the test procedures fo