豆丁网：http:/www.docin.com/kmust1BRITISH STANDARDMagnesium and magnesium alloys Unalloyed magnesiumThe European Standard EN 12421:1998 has the status of aBritish StandardICS 77.120.20| BS EN12421:1998|NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS EN 12421:1998National forewordThis British Standard is the English language version of EN 12421:1998.The UK participation in its preparation was entrusted by Technical Committee NFE/35, Light metals and their alloys, to Subcommittee NFE/35/4, Magnesium and magnesium alloys, which has the responsibility to: aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK.A list of organizations represented on this subcommittee can be obtained on request to its secretary.Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled International Standards Correspondence Index, or by using theFind facility of the BSI Standards Electronic Catalogue.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 of pagesThis document comprises a front cover, an inside front cover, the EN title page, pages 2 to 5 and a back cover.Amd. No.DateText affectedThis British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 November 1998BSI 1998ISBN 0 580 29992 9Amendments issued since publicationEUROPEAN STANDARDEN 12421NORME EUROPE ENNEEUROPA ISCHE NORMApril 1998ICS 77.120.20Descriptors: Magnesium, chemical composition, designation, quality, classification, marking, testsEnglish versionMagnesium and magnesium alloys Unalloyed magnesiumMagne sium et alliages de magne sium Magne sium non allieMagnesium und Magnesiumlegierungen ReinmagnesiumThis European Standard was approved by CEN on 25 March 1998.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 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 its 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, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.CENEuropean Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r NormungCentral Secretariat: rue de Stassart 36, B-1050 Brussels1998 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN nationalMembers.Ref. No. EN 12421:1998 EPage 2EN 12421:1998ForewordThis European Standard has been prepared byTechnical Committee CEN/TC 190, Foundry technology,ContentsPagethe secretariat of which is held by DIN.Within its programme of work, Technical Committee CEN/TC 190 requested CEN/TC 190/WG 3.10, Cast magnesium, to prepare the following standard:EN 12421, Magnesium and magnesium alloys Unalloyed magnesium.This European Standard shall be given the status of a national standard, either by publication of an identica