2626 NTERNATIONAL STANDARD TSO Copper -- Hydrogen embrittlement test First edition - 1973-11-15 ISO 2626-1973 (E) UDC 669.3 : 539.56 Ref.No. ISO 2626-1973 (E) Descriptors : copper, tests, embrittiement, hydrogen embrittlement, bend tests. Price based on 2 pages FOREWORD Iso (the International Organization for Standardization) is a worldwidefederation of national standards institutes (isO Member Bodies).The work of developing International Standardsiscarriedout throughIsoTechnical Committees.Every Member Body interested in a subject for which a Technical Committee has been set up has the right to be represented on that Committee. international organizations, governmental and non-governmental, in liaison with iso, also take part in the work. Draft International Standards adopted by the Technical Committees are circulated to the Member Bodies for approval before their acceptance as International Standards by the ISo Council. International Standard ISO2626 was drawn up by Technical Committee ISO/Tc26,Copper and copper alloys, and circulated to the Member Bodies in November 1971. It has been approved by the Member Bodies of the following countries : Austria India Spain Belgium Japan Sweden Canada Netherlands Switzerland Chile NewZealand Thailand Czechoslovakia Norway Turkey Egypt, Arab Rep. of Portugal United Kingdom France Romania U.S.A. Hungary South Africa, Rep. of U.S.S.R. No Member Body expressed disapproval of the document. @ International Organization for Standardization, 1973. Printedin Switzerland ISO2626-1973 (E) INTERNATIONALSTANDARD Copper -- Hydrogen embrittlement test 1 SCOPEANDFIELDOFAPPLICATION 4.3Testpieceformicroscopicexamination This International Standard specifies the procedure for the This shall be of convenient size and shall include an outside hydrogen embrittlement testing of deoxidized and oxygen surface of the material on at least one face. free high conductivity coppers. 2REFERENCES ISO/R398,Bendtestforcopperandcopperalloys. 5PROCEDURE ISo2625,Copper andcopper alloys-Reverse bend testing ofwire. 5.1 Exposure in hydrogen Heat the test piece, prepared as above,in a furnace with an 3 PRINCIPLE atmosphere containing not less than 10% of hydrogen, maintained at a temperature between 825 and 875°c for a Preparation of a test piece and heating in an atmosphere period of 30 min, and cool in the furnace atmosphere or containing hydrogen. if oxygen is present in the metal, quench in water. reaction occurs which causes embrittlement.Cooling of the test piece out of contact with air. Embrittlement is then revealed by close bending or reverse 5.2 Testingfor embrittlement bending,orby microscopic examination. 5.2.1 Close-bend test 4TESTPIECES Carry out the close-bend test at ambienttemperature.Bend the test piece, AB in the figure, by steady pressure applied at right angles to the length, until the end A takes the 4.1 Close-bend test piece position indicated by C.Theoriginal surface ofthe material This shall be of a convenient length and either of the full shall be at the outside of the bend (see Figure). section or ofaconvenientthicknessordiameternotgreater than 12 mm (0.5 in). Any edges shall be rounded and Bending will normally be carried out in two stages. For the smoothed. Test pieces not of the full section shall contain first stage, either of the methods shown in ISO/R 398 may some part of the original surface of the material. be used to bend the test piecetoa V-shape.The choiceof method will determine the minimum length of the test 4.2 Reverse bend test piece piece. Thisshallbeofconvenientlength,withathicknessor In the second stage, bring the two legs of the test piece into diameter not exceeding 2,5 mm (0.1 in). Any edges shall be rounded and smoothed. Test pieces not of the full section the V, for example by closing in a vice. After bending, shall contain some part of the original surface of the inspect the stressed surface visually for the presence of material. cracks. 1