1、BS EN ISO3506-4:2009ICS 21.060.10NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDMechanical propertiesof corrosion-resistantstainless steelfastenersPart 4: Tapping screwsThis British Standardwas published under theauthority of the StandardsPolicy and StrategyCom
2、mittee on 31 December2009. BSI 2009ISBN 978 0 580 65932 4Amendments/corrigenda issued since publicationDate CommentsBS EN ISO 3506-4:2009National forewordThis British Standard is the UK implementation of EN ISO 3506-4:2009.It supersedes BS EN ISO 3506-4:2003 which is withdrawn.The UK participation i
3、n its preparation was entrusted to TechnicalCommittee FME/9/1, Mechanical properties of fasteners.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are respons
4、ible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 3506-4 November 2009 ICS 21.060.10 Supersedes EN ISO 3506-4:2003English Version Mechanical properties of corrosion-resistant stain
5、less steel fasteners - Part 4: Tapping screws (ISO 3506-4:2009) Caractristiques mcaniques des lments de fixation en acier inoxydable rsistant la corrosion - Partie 4: Vis tle (ISO 3506-4:2009) Mechanische Eigenschaften von Verbindungselementen aus nichtrostenden Sthlen - Teil 4: Blechschrauben (ISO
6、3506-4:2009) This European Standard was approved by CEN on 24 October 2009. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and biblio
7、graphical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility o
8、f a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Irel
9、and, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 1
10、7, B-1000 Brussels 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 3506-4:2009: EEN ISO 3506-4:2009 (E) 3 Foreword This document (EN ISO 3506-4:2009) has been prepared by Technical Committee ISO/TC 2 “Fasteners“ in collabo
11、ration with Technical Committee CEN/TC 185 “Fasteners”, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 2010, and conflicting national standards shall
12、be withdrawn at the latest by May 2010. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 3506-4:2003. A
13、ccording to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, L
14、atvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 3506-4:2009 has been approved by CEN as a EN ISO 3506-4:2009 without any modification. BS EN ISO 3506-4:2009I
15、SO 3506-4:2009(E) ISO 2009 All rights reserved iiiContents Page Foreword iv Introduction.v 1 Scope1 2 Normative references1 3 Designation, marking and finish2 3.1 Designation 2 3.2 Marking.3 3.3 Finish 4 4 Chemical composition 4 5 Mechanical properties.5 5.1 General .5 5.2 Surface hardness 5 5.3 Cor
16、e hardness .6 5.4 Torsional strength .6 5.5 Thread forming capability.6 6 Test methods .6 6.1 Surface hardness test.6 6.2 Core hardness test 6 6.3 Torsional strength test6 6.4 Drive test 8 Annex A (normative) Description of the groups and grades of stainless steels .9 Annex B (informative) Stainless
17、 steel for cold heading and extruding.12 Annex C (informative) Austenitic stainless steels with particular resistance to chloride induced stress corrosion 14 Annex D (informative) Time-temperature diagram of intergranular corrosion in austenitic stainless steels, grade A2 (18/8 steels).15 Annex E (i
18、nformative) Magnetic properties for austenitic stainless steels 16 Bibliography17 BS EN ISO 3506-4:2009ISO 3506-4:2009(E) iv ISO 2009 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The w
19、ork of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-govern
20、mental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The
21、 main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
22、 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. ISO 3506-4 was prepared by Technical Committee ISO/TC 2, Fasteners, Subcommittee SC 1, Mechanical pr
23、operties of fasteners. 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 stainless steel fasteners: Part 1: Bolts, screws and
24、 studs Part 2: Nuts Part 3: Set screws and similar fasteners not under tensile stress Part 4: Tapping screws BS EN ISO 3506-4:2009ISO 3506-4:2009(E) ISO 2009 All rights reserved vIntroduction In the preparation of this part of ISO 3506, special attention has been given to the fundamentally different
25、 property characteristics of the stainless steel fastener grades compared with those of carbon steel and low-alloy steel fasteners. Ferritic and austenitic stainless steels are strengthened only by cold working and consequently, the components do not have as homogeneous local material properties as
26、hardened and tempered parts. These special features have been recognized in the elaboration of the hardness classes and the test procedures for mechanical properties. The primary objective of this part of ISO 3506 is to ensure that corrosion-resistant austenitic, martensitic and ferritic stainless s
27、teel tapping screws will form mating threads in materials such as aluminium into which they are normally driven without deforming their own thread and without breaking during assembly or service. Selection of the steel group is based on the intended application. BS EN ISO 3506-4:2009BS EN ISO 3506-4
28、:2009INTERNATIONAL STANDARD ISO 3506-4:2009(E) ISO 2009 All rights reserved 1Mechanical properties of corrosion-resistant stainless steel fasteners Part 4: Tapping screws 1 Scope This part of ISO 3506 specifies the mechanical properties of tapping screws made of austenitic, martensitic and ferritic
29、steel grades of corrosion-resistant stainless steels, when tested over an ambient temperature range of 10 C to 35 C. Properties vary at higher or lower temperatures. It applies to tapping screws with threads from ST2,2 up to and including ST8, in accordance with ISO 1478. It does not apply to screws
30、 with special properties, such as weldability. NOTE The designation system of this part of ISO 3506 can be used for sizes outside the limits given in this clause (e.g. d ST8), provided that all applicable mechanical and physical requirements of the hardness classes are met. This part of ISO 3506 doe
31、s not define corrosion or oxidation resistance in particular environments. However, some information on materials for particular environments is given in Annex C. Regarding definitions of corrosion and corrosion resistance, see ISO 8044. The aim of this part of ISO 3506 is the classification of corr
32、osion-resistant stainless steel tapping screws into hardness classes. Corrosion and oxidation performances and mechanical properties for use at elevated or sub-zero temperatures can be agreed on between the user and the manufacturer in each particular case. Annex D shows how the risk of intergranula
33、r corrosion at elevated temperatures depends on the carbon content. All austenitic stainless steel fasteners are normally non-magnetic in the annealed condition; after cold working, some magnetic properties can be evident (see Annex E). 2 Normative references The following referenced documents are i
34、ndispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 1478, Tapping screws thread ISO 3651-1, Determination of resistance to intergranular
35、corrosion of stainless steels Part 1: Austenitic and ferritic-austenitic (duplex) stainless steels Corrosion test in nitric acid medium by measurement of loss in mass (Huey test) ISO 3651-2, Determination of resistance to intergranular corrosion of stainless steels Part 2: Ferritic, austenitic and f
36、erritic-austenitic (duplex) stainless steels Corrosion test in media containing sulfuric acid BS EN ISO 3506-4:2009ISO 3506-4:2009(E) 2 ISO 2009 All rights reservedISO 6507-1, Metallic materials Vickers hardness test Part 1: Test method ISO 16048, Passivation of corrosion-resistant stainless-steel f
37、asteners ISO 16426, Fasteners Quality assurance system 3 Designation, marking and finish 3.1 Designation The designation system for stainless steel grades and hardness classes for tapping screws is given in Figure 1. The designation of the material consists of two blocks, which are separated by a hy
38、phen. The first block designates the steel grade and the second block, the hardness class. The designation of the steel grade (first block) consists of one of the letters A for austenitic steel, C for martensitic steel, or F for ferritic steel which indicates the group of steel and a digit, which in
39、dicates a range of chemical compositions within this steel group (see Table 2). The designation of the hardness class (second block) consists of two digits representing 1/10 of the minimum Vickers hardness and the letter H, referring to hardness (see Table 1). Table 1 Designations of hardness classe
40、s in relation to Vickers hardness Hardness class 20H 25H 30H 40H Vickers hardness, HV min. 200 250 300 400 EXAMPLE 1 A4-25H indicates: austenitic steel of steel grade A4, cold worked, minimum hardness 250 HV. EXAMPLE 2 C3-40H indicates: martensitic steel of steel grade C3, hardened and tempered, min
41、imum hardness 400 HV. BS EN ISO 3506-4:2009ISO 3506-4:2009(E) ISO 2009 All rights reserved 3aThe steel groups and steel grades classified in Figure 1 are described in Annex A and specified by the chemical composition given in Table 2. bLow-carbon austenitic stainless steels with carbon content not e
42、xceeding 0,03 % may additionally be marked with an “L”. EXAMPLE A4L-25H cTapping screws passivated in accordance with ISO 16048 may additionally be marked with a “P”. EXAMPLE A4-25HP Figure 1 Designation system for stainless steel grades and hardness classes for tapping screws 3.2 Marking 3.2.1 Gene
43、ral Marking of tapping screws is not mandatory. When tapping screws manufactured according to the requirements of this part of ISO 3506 are designated and marked, they shall be designated in accordance with the designation system described in 3.1 and marked in accordance with 3.2.2 and 3.2.3. Howeve
44、r, the designation system described in 3.1 and the provisions for marking according to 3.2.3 shall be used only if all relevant requirements of this part of ISO 3506 are met. 3.2.2 Manufacturers identification mark A manufacturers identification mark shall be included during the manufacturing proces
45、s on all tapping screws which are marked with a hardness class symbol, provided this is possible for technical reasons. Manufacturers identification marking is also recommended on tapping screws which are not marked with a hardness class symbol. 3.2.3 Tapping screws When tapping screws are marked, t
46、hey shall be clearly marked in accordance with 3.1. The marking should include the steel grade and hardness class. BS EN ISO 3506-4:2009ISO 3506-4:2009(E) 4 ISO 2009 All rights reserved3.2.4 Packages All packages for all types of tapping screws of all sizes shall be marked (e.g. through labelling).
47、The marking shall include the manufacturers and/or distributors identification and the marking symbol for the steel grade and hardness class according to Figure 1 and the manufacturing lot number, as defined in ISO 16426. 3.3 Finish Unless otherwise specified, tapping screws in accordance with this
48、part of ISO 3506 shall be supplied clean and bright. For maximum corrosion resistance, passivation is recommended. When passivation is required, it shall be performed in accordance with ISO 16048. Tapping screws that are passivated may additionally be marked with the symbol “P” after the symbols for
49、 steel grade and hardness class (see footnote c of Figure 1). For tapping screws manufactured to a specific order, the additional marking should be applied to both the fastener and the label. For tapping screws delivered from stock, the additional marking should be applied to the label. 4 Chemical composition The chemical compositions of stainless steels suitable for tapping screws in accordance with this part of ISO 3506 are given in Table 2. NOTE The chemical compositions given in Table 2 correspond wit
