1、BRITISH STANDARD BS EN ISO 196:1995 Wrought copper and copper alloys Detection of residual stress Mercury(I) nitrate test The European Standard EN ISO196:1995 has the status of a British StandardBSENISO196:1995 This British Standard, having been prepared under the directionof the Engineering SectorB
2、oard, was published underthe authority of the Standards Board and comesintoeffect on 15September1995 BSI 09-1999 The following BSI references relate to the work on this standard: Committee reference NFE/34 Draft for comment 94/715244 DC ISBN 0 580 24478 4 Committees responsible for this British Stan
3、dard The preparation of this British Standard was 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 B
4、ritish Valve and Actuator Manufacturers Association 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 subcommit
5、tees and panels: British Plumbing Fittings Manufacturers 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 Gen
6、eration Contractors Association PGCA (BEAMA Ltd.) Spring Research and Manufacturers Association Amendments issued since publication Amd. No. Date CommentsBSENISO196:1995 BSI 09-1999 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 1 Scope and field of applica
7、tion 3 2 Definitions 3 3 Test solution 3 4 Test piece 3 5 Procedure 3 6 Test requirements 3BSENISO196:1995 ii BSI 09-1999 National foreword This British Standard has been prepared by Technical Committee NFE/34 and is the English language version of EN ISO196:1995 Wrought copper and copper alloys Det
8、ection of residual stress Mercury(I) nitrate test, published by the European Committee for Standardization (CEN). EN ISO196 is identical with ISO196:1978, published by the International Organization for Standardization (ISO). It was produced as a result of international discussions in which the Unit
9、ed Kingdom took an active part. A British Standard does not purport to include all 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 o
10、f pages This document comprises a front cover, an inside front cover, pages i and ii, the EN ISO title page, pages 2 and 3 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
11、 cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 196 May 1995 ICS 77.040.30 Descriptors: Non-ferrous alloys, copper, copper alloys, rolled products, chemical tests, stress-corrosion tests, corrosion tests, accelerated tests, mercury nitrates English version Wrought copper and copper a
12、lloys Detection of residual stress Mercury(I) nitrate test (ISO 196:1978) Cuivre et alliages de cuivre corroys Dtection des contraintes rsiduelles Essai au nitrate de mercure(I) (ISO 196:1978) Kupfer-und Kupfer-Knetlegierungen Auffinden von Restspannungen Quecksilber(I) Nitratversuch (ISO 196:1978)
13、This European Standard was approved by CEN on1995-02-06. 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 reference
14、s concerning such national 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 i
15、ts own language and notified 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, Switz
16、erland and United Kingdom. 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
17、 and its members Ref. No. EN ISO 196:1995 EENISO196:1995 BSI 09-1999 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 alloy
18、s. The 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 November1995, and conflicting national standards shall be withdrawn at the latest by November1995. According to the CEN/CENELEC Internal Regulation
19、s, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom.ENISO196:1995 BSI 09-1999 3 1 Scope and field of appli
20、cation This International Standard specifies an accelerated test, using mercury(I) nitrate, for the purpose of detecting the presence of residual (internal) stresses in wrought copper and copper alloy products that might bring about failure of the material in service or storage through stress corros
21、ion cracking. While this method has also been used for testing assemblies and partial assemblies, it is not intended for that purpose, and some modification may be required for such use. 2 Definitions 2.1 stress corrosion cracking spontaneous failure of metals by cracking under combined action of co
22、rrosion and stress, residual or applied 2.2 applied stress stress that is set up and exists in a body during application of an external load 2.3 residual stress stress that remains within a body as the result of plastic deformation 3 Test solution The test solution is an aqueous solution containing1
23、0g of mercury(I) nitrate and10ml of nitric acid per litre of solution. This solution shall be prepared by the following procedure. WARNING Mercury(I) nitrate crystals should be handled with caution because of their highly toxic effects. Dissolve11,4g of mercury(I) nitrate dihydrate (HgNO 3 .2H 2 O)
24、or10,7g of mercury(I) nitrate monohydrate (HgNO 3 .H 2 O) in approximately40ml of distilled water acidified with10ml of nitric acid( 20 1,40 to1,42g/ml). After the crystals are completely dissolved, dilute the solution with distilled water to1000ml. NOTEIf heating is used for preparing the mercury(I
25、) nitrate solution, care should be exercised to prevent loss of nitric acid. 4 Test piece 4.1 The length of the test piece shall be at least150mm for products of diameter less than or equal to75mm. For products of diameter greater than75mm, the length shall be subject to agreement. 4.2 Test pieces f
26、or the mercury(I) nitrate test shall not be marked for identification by stamping. 5 Procedure 5.1 First degrease the test piece. Then totally immerse it in an aqueous solution of sulphuric acid15% (V/V) or in a mixture containing60 parts by volume of distilled water and40 parts by volume of concent
27、rated nitric acid for a period not exceeding30s, to remove all traces of carbonaceous matter and oxide films. Remove the test piece from the pickling solution and wash it immediately in running water. Then drain the test piece free of excess water and totally immerse it in the test solution (clause3
28、). Use at least1,5ml of test solution per square centimetre of exposed surface of the test piece. 5.2 After30 min, remove the test piece from the test solution and wash it in running water. Wipe off any excess mercury from the surface of the test piece. Examine the test piece at once, unless otherwi
29、se specified in the material specification. The material specification may permit a lapse of time before examination, which may vary with the alloy being tested. In cases of doubt regarding the presence of cracks, volatilize (with caution) the mercury on the surface of the test piece by the applicat
30、ion of heat on a hot-plate or in an oven. Then examine the specimen for cracks under suitable magnifying equipment at a magnification of10 to18X. WARNING Mercury is a definite health hazard and therefore equipment for the detection and removal of mercury vapour produced in volatilization is recommen
31、ded. The use of rubber gloves is advisable. 5.3 A solution the concentration of which is not in accord with that specified in clause3 must not be used. 6 Test requirements The interpretation of the visual appearance of the test pieces after testing is a matter for the material specification.BS EN IS
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