1、BS EN ISO3506-2:2009ICS 21.060.20NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDMechanical pro ertiesof corrosion-restistantstainless steelfastenersPart 2: NutspThis British Standardwas published under theauthority of the StandardsPolicy and StrategyCommittee o
2、n 31 December2009. BSI 2009ISBN 978 0 580 58917 1Amendments/corrigenda issued since publicationDate CommentsBS EN ISO 3506-2:2009National forewordThis British Standard is the UK implementation of EN ISO 3506-2:2009.It supersedes BS EN ISO 3506-2:1998 which is withdrawn.The UK participation in its pr
3、eparation 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 responsible for
4、 its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 3506-2 November 2009 ICS 21.060.20 Supersedes EN ISO 3506-2:1997English Version Mechanical properties of corrosion-resistant stainless ste
5、el fasteners - Part 2: Nuts (ISO 3506-2:2009) Caractristiques mcaniques des lments de fixation en acier inoxydable rsistant la corrosion - Partie 2: crous (ISO 3506-2:2009) Mechanische Eigenschaften von Verbindungselementen aus nichtrostenden Sthlen - Teil 2: Muttern (ISO 3506-2:2009) This European
6、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 bibliographical references concer
7、ning 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 of a CEN member into its own
8、 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, Ireland, Italy, Latvia, Lithuan
9、ia, 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 17, B-1000 Brussels 2009 CEN
10、 All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 3506-2:2009: EBS EN ISO 3506-2:2009EN ISO 3506-2:2009 (E) 3 Foreword This document (EN ISO 3506-2:2009) has been prepared by Technical Committee ISO/TC 2 “Fasteners“ in collaboration
11、 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 be wit
12、hdrawn 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 3506-2:1997. Accordi
13、ng 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, Latvia,
14、 Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 3506-2:2009 has been approved by CEN as a EN ISO 3506-2:2009 without any modification. BS EN ISO 3506-2:2009ISO 350
15、6-2:2009(E) ISO 2009 All rights reserved iiiContents Page Foreword iv Introduction.v 1 Scope1 2 Normative references2 3 Symbols2 4 Designation, marking and finish3 4.1 Designation 3 4.2 Marking.4 4.3 Finish 6 5 Chemical composition 6 6 Mechanical properties.7 7 Test methods .8 7.1 Hardness HB, HRC o
16、r HV8 7.2 Proof load.8 Annex A (informative) Description of the groups and grades of stainless steels .9 Annex B (informative) Stainless steel composition specifications .12 Annex C (informative) Stainless steels for cold heading and extruding.15 Annex D (informative) Austenitic stainless steels wit
17、h particular resistance to chloride induced stress corrosion 17 Annex E (informative) Mechanical properties at elevated temperatures; application at low temperatures18 Annex F (informative) Time-temperature diagram of intergranular corrosion in austenitic stainless steels, grade A2 (18/8 steels) .19
18、 Annex G (informative) Magnetic properties for austenitic stainless steels20 Bibliography21 BS EN ISO 3506-2:2009ISO 3506-2:2009(E) iv ISO 2009 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodi
19、es). The work 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
20、non-governmental, 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, P
21、art 2. The 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 casti
22、ng 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. ISO 3506-2 was prepared by Technical Committee ISO/TC 2, Fasteners, Subcommittee SC 1, Mec
23、hanical properties of fasteners. This second edition cancels and replaces the first edition (ISO 3506-2:1997), 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,
24、screws and studs Part 2: Nuts Part 3: Set screws and similar fasteners not under tensile stress Part 4: Tapping screws BS EN ISO 3506-2:2009ISO 3506-2:2009(E) ISO 2009 All rights reserved vIntroduction In the preparation of this part of ISO 3506, special attention has been given to the fundamentally
25、 different 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 prop
26、erties as hardened and tempered parts. These special features have been recognized in the elaboration of the property classes and the test procedures for mechanical properties. The latter differ from the carbon steel and low-alloy steel fastener test procedures with regard to the measurement of the
27、stress at 0,2 % permanent strain (yield stress) and ductility (total elongation after fracture). BS EN ISO 3506-2:2009BS EN ISO 3506-2:2009INTERNATIONAL STANDARD ISO 3506-2:2009(E) ISO 2009 All rights reserved 1Mechanical properties of corrosion-resistant stainless steel fasteners Part 2: Nuts 1 Sco
28、pe This part of ISO 3506 specifies the mechanical properties of nuts made of austenitic, martensitic and ferritic 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. This part of ISO 350
29、6 applies to nuts: with nominal thread diameter D u 39 mm; of triangular ISO metric threads with diameters and pitches in accordance with ISO 68-1, ISO 261 and ISO 262; of any shape; with width across flats as specified in ISO 272; with nominal heights m W 0,5D. It does not apply to nuts requiring p
30、roperties such as locking abilities, and 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 39 mm), provided that all applicable mechanical and physical requirements of the property classes are met. This part of ISO
31、 3506 does not define corrosion or oxidation resistance in particular environments. However, some information on materials for particular environments is given in Annex D. Regarding definitions of corrosion and corrosion resistance, see ISO 8044. The aim of this part of ISO 3506 is the classificatio
32、n of corrosion-resistant stainless steel nuts into property classes. Some materials can be used at temperatures down to 200 C, some can be used at temperatures up to + 800 C in air. Information on the influence of temperature on mechanical properties is found in Annex E. Corrosion and oxidation perf
33、ormances 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 F shows how the risk of intergranular corrosion at elevated temperatures depends on the carbon content. BS EN ISO 3506-2:2009ISO 3506-
34、2:2009(E) 2 ISO 2009 All rights reservedAll austenitic stainless steel fasteners are normally non-magnetic in the annealed condition; after cold working, some magnetic properties can be evident (see Annex G). 2 Normative references The following referenced documents are indispensable for the applica
35、tion 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 68-1, ISO general purpose screw threads Basic profile Part 1: Metric screw threads ISO 261, ISO general purpose m
36、etric screw threads General plan ISO 262, ISO general purpose metric screw threads Selected sizes for screws, bolts and nuts ISO 272, Fasteners Hexagon products Widths across flats ISO 898-2, Mechanical properties of fasteners Part 2: Nuts with specified proof load values Coarse thread ISO 898-6, Me
37、chanical properties of fasteners Part 6: Nuts with specified proof load values Fine pitch thread ISO 3651-1, Determination of resistance to intergranular corrosion of stainless steels Part 1: Austenitic and ferritic-austenitic (duplex) stainless steels Corrosion test in nitric acid medium by measure
38、ment of loss in mass (Huey test) ISO 3651-2, Determination of resistance to intergranular corrosion of stainless steels Part 2: Ferritic, austenitic and ferritic-austenitic (duplex) stainless steels Corrosion test in media containing sulfuric acid ISO 6506-1, Metallic materials Brinell hardness test
39、 Part 1: Test method ISO 6507-1, Metallic materials Vickers hardness test Part 1: Test method ISO 6508-1, Metallic materials Rockwell hardness test Part 1: Test method (scales A, B, C, D, E, F, G, H, K, N, T) ISO 16048, Passivation of corrosion-resistant stainless-steel fasteners ISO 16426, Fastener
40、s Quality assurance system 3 Symbols D nominal thread diameter m height of the nut (nominal value) P pitch of the thread ReLlower yield stress Rp0,2stress at 0,2 % permanent strain s width across flats Spstress under proof load rpermeability value in a magnetic field BS EN ISO 3506-2:2009ISO 3506-2:
41、2009(E) ISO 2009 All rights reserved 34 Designation, marking and finish 4.1 Designation The designation system for stainless steel grades and property classes for nuts is given in Figure 1. The designation of the material consists of two blocks, which are separated by a hyphen. The first block desig
42、nates the steel grade and the second block, the property class. The designation of the steel grade (first block) consists 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 indicates a range of chemical compos
43、itions within this steel group (see Table 1). The designation of the property class (second block) consists of two digits for nuts with height m W 0,8D (style 1 or style 2 or hexagon flange nuts), representing 1/10 of the stress under proof load, and three digits for nuts with height 0,5D u m 0,8D (
44、thin nuts/style 0), the first digit “0” indicating that the nut has a reduced loadability and the following digits representing 1/10 of the stress under proof load. The following are examples for the designation of material. EXAMPLE 1 A2-70 indicates: austenitic steel, cold worked, minimum 700 MPa s
45、tress under proof load (nut with m W 0,8D). EXAMPLE 2 C4-70 indicates: martensitic steel, hardened and tempered, minimum 700 MPa stress under proof load (nut with m W 0,8D). EXAMPLE 3 A2-035 indicates: austenitic steel, cold worked, minimum 350 MPa stress under proof load (nut with 0,5D u m 0,8D). B
46、S EN ISO 3506-2:2009ISO 3506-2:2009(E) 4 ISO 2009 All rights reservedaThe steel groups and steel grades classified in Figure 1 are described in Annex A and specified by the chemical composition given in Table 1. bLow carbon austenitic stainless steels with carbon content not exceeding 0,03 % may add
47、itionally be marked with an “L”. EXAMPLE A4L-80 cNuts passivated in accordance with ISO 16048 may additionally be marked with a “P”. EXAMPLE A4-80P Figure 1 Designation system for stainless steel grades and property classes for nuts 4.2 Marking 4.2.1 General Nuts manufactured according to the requir
48、ements of this part of ISO 3506 shall be designated in accordance with the designation system described in 4.1 and marked in accordance with 4.2.2 and 4.2.3. However, the designation system described in 4.1 and the provisions for marking according to 4.2.3 shall be used only if all relevant requirem
49、ents of this part of ISO 3506 are met. NOTE For marking of left-hand threads, see ISO 898-2. 4.2.2 Manufacturers identification mark A manufacturers identification mark shall be included during the manufacturing process on all nuts which are marked with a property class symbol, provided this is possible for technical reasons. Manufacturers identification marking is also recommended on nuts which are not marked with a property class symbol. 4.2.3 Nuts All nuts o
