1、BRITISH STANDARD BSENISO 2626:1995 Copper Hydrogen embrittlement test The European Standard EN ISO 2626:1995 has the status of a British StandardBSENISO2626:1995 This British Standard, having been prepared under the directionof the Engineering Sector Board, was published underthe authority of the St
2、andards Board and comes intoeffect on 15September1995 BSI 08-1999 The following BSI references relate to the work on this standard: Committee reference NFE/34 Draft for comment 94/715244 DC ISBN 0 580 24477 6 Committees responsible for this British Standard The preparation of this British Standard w
3、as entrusted to Technical Committee NFE/34, Copper and copper alloys, upon which the following bodies were represented: British Bathroom Council British Cable Makers Confederation British Non-ferrous Metals Federation British Refrigeration Association British Valve and Actuator Manufacturers Associa
4、tion Copper Development Association London Metal Exchange Non-ferrous Metal Stockists Transmission and Distribution Association (BEAMA Limited) Coopted members The following bodies were also represented in the drafting of the standard, through subcommittees and panels: British Plumbing Fittings Manu
5、facturers Association British Railways Board British Turned-parts Manufacturers Association Institution of Incorporated Executive Engineers London Regional Transport National Association of Plumbing, Heating and Mechanical Services Contractors Power Generation Contractors Association (PGCA) (BEAMA L
6、td.) Spring Research and Manufacturers Association Amendments issued since publication Amd. No. Date CommentsBSENISO2626:1995 BSI 08-1999 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 1 Scope and field of application 3 2 References 3 3 Principle 3 4 Test p
7、ieces 3 5 Procedure 3 Figure Close-bend test 4BSENISO2626:1995 ii BSI 08-1999 National foreword This British Standard has been prepared by Technical Committee NFE/34 and is the English language version of ENISO2626:1995 Copper Hydrogen embrittlement test, published by the European Committee for Stan
8、dardization (CEN). It supersedes BS5899:1980 which is withdrawn. ENISO2626 is identical with ISO2626:1973, published by the International Organization for Standardization (ISO). It should be noted that, in view of the safety hazard which could arise when hydrogen is mixed with other gases at high te
9、mperatures, the UnitedKingdom voted negatively at the CEN PQ stage and at the CEN Formal Vote stage. The UK also proposed a replacement text for subclause5.1 which, the UK considered, would have overcome the problem, as follows. “5.1 Exposure in hydrogen Suitably prepared test pieces (see4.1 and4.2)
10、 shall be placed in a tube furnace containing an atmosphere of100% hydrogen. The test pieces shall be quickly heated to a temperature between825 C and875 C for a minimum period of30min. The heating shall be turned off and the samples cooled to ambient temperature whilst still remaining in the hydrog
11、en atmosphere. WARNING. Hydrogen gas, if mixed with other gases, may form an explosive/flammable mixture. A positive pressure of hydrogen shall be maintained and the exhaust gas passed through a water trap, so that it can then be disposed of safely.” A British Standard does not purport to include al
12、l the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andi
13、i, theEN ISO title page, pages2 to4 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 2626 May1995 ICS 77.040
14、.30 Descriptors: Copper, tests, embrittlement, hydrogen embrittlement, bend tests English version Copper Hydrogen embrittlement test (ISO 2626:1973) Cuivre Essai de fragilisation par chauffage dans lhydrogne (ISO 2626:1973) Kupfer Wasserstoff-Versprdungsversuch (ISO 2626:1973) This European Standard
15、 was approved by CEN on1995-02-26. 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 concerning such nati
16、onal standards may be obtained on application to the Central Secretariat 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 language and no
17、tified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingd
18、om. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1995 All rights of reproduction and communication in any form and by any means reserved in all countries to CEN and its members Ref. N
19、o. ENISO2626:1995EENISO2626:1995 BSI 08-1999 2 Foreword The text of the International Standard from ISO/TC26, Copper and copper alloys, of the International Organization for Standardization (ISO) has been taken over as a European Standard by CEN/TC133, Copper and copper alloys. This European Standar
20、d shall be given the status of a national standard either by publication of an identical text or by endorsement, at the latest by November1995, and conflicting national standards shall be withdrawn at the latest by November1995. According to the CEN/CENELEC Internal Regulations, the following countr
21、ies are bound to implement this European Standard:Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, UnitedKingdom.ENISO2626:1995 BSI 08-1999 3 1 Scope and field of application This Internationa
22、l Standard specifies the procedure for the hydrogen embrittlement testing of deoxidized and oxygen free high conductivity coppers. 2 References ISO/R398, Bend test for copper and copper alloys. ISO2625, Copper and copper alloys Reverse bend testing of wire. 3 Principal Preparation of a test piece an
23、d heating in an atmosphere containing hydrogen. If oxygen is present in the metal, reaction occurs which causes embrittlement. Cooling of the test piece out of contact with air. Embrittlement is then revealed by close bending or reverse bending, or by microscopic examination. 4 Test Pieces 4.1 Close
24、-bend test piece This shall be of a convenient length and either of the full section or of a convenient thickness or diameter not greater than12mm (0.5in). Any edges shall be rounded and smoothed. Test pieces not of the full section shall contain some part of the original surface of the material. 4.
25、2 Reverse bend test piece This shall be of convenient length, with a thickness or diameter not exceeding2,5mm(0.1in). Any edges shall be rounded and smoothed. Test pieces not of the full section shall contain some part of the original surface of the material. 4.3 Test piece for microscopic examinati
26、on This shall be of convenient size and shall include an outside surface of the material on at least one face. 5 Procedure 5.1 Exposure in hydrogen Heat the test piece, prepared as above, in a furnace with an atmosphere containing not less than10% of hydrogen, maintained at a temperature between825
27、and875 C for a period of30min, and cool in the furnace atmosphere or quench in water. 5.2 Testing for embrittlement 5.2.1 Close-bend test Carry out the close-bend test at ambient temperature. Bend the test piece, AB in the Figure, by steady pressure applied at right angles to the length, until the e
28、nd A takes the position indicated by C. The original surface of the material shall be at the outside of the bend (seeFigure). Bending will normally be carried out in two stages. For the first stage, either of the methods shown in ISO/R398 may be used to bend the test piece to a V-shape. The choice o
29、f method will determine the minimum length of the test piece. In the second stage, bring the two legs of the test piece into contact by steady pressure applied across the open end of the V, for example by closing in a vice. After bending, inspect the stressed surface visually for the presence of cra
30、cks. 5.2.2 Reverse bend test Carry out the reverse bend test according to ISO2625. Subject the test piece to10reverse bends. Subject the original surface of the material to the maximum stress. After bending, inspect the stressed surface with the unaided eye, corrected for normal vision, for the pres
31、ence of cracks. 5.2.3 Microscopic examination Section the test piece so that an outside surface is intersected at right angles. Polish the section, etch if desired, and examine under a microscope at a magnification of200X, for evidence of gassing or open grain structure characteristic of embrittleme
32、nt.ENISO2626:1995 4 BSI 08-1999 Figure Close-bend test5 blankBSENISO 2626:1995 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the internatio
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