1、BS EN 12421:2017Magnesium and magnesiumalloys Unalloyed magnesiumBSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS EN 12421:2017 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 12421:2017. It supersedes BS EN 12421:1998 which is
2、 withdrawn.The UK participation in its preparation was entrusted to Technical Committee ISE/111, Steel Castings and Forgings.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of
3、a contract. Users are responsible for its correct application. The British Standards Institution 2017 .Published by BSI Standards Limited 2017ISBN 978 0 580 91095 1 ICS 77.120.20 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published unde
4、r the authority of the Standards Policy and Strategy Committee on 31 March 2017.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS EN 12421:2017EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12421 March 2017 ICS 77.120.20 Supersedes EN 12421:1998English Version Magnes
5、ium and magnesium alloys - Unalloyed magnesiumMagnsium et alliages de magnsium - Magnsium non alli Magnesium und Magnesiumlegierungen - Reinmagnesium This European Standard was approved by CEN on 6 January 2017. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulat
6、e 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 CEN-CENELEC Management Centre or to any CEN member. This European Stan
7、dard 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 CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the nat
8、ional standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Se
9、rbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and b
10、y any means reserved worldwide for CEN national Members. Ref. No. EN 12421:2017 EBS EN 12421:2017EN 12421:2017 (E) 2 Contents Page European foreword . 3 Introduction 4 1 Scope 5 2 Normative references 5 3 Terms and definitions . 5 4 Designations 5 5 Order information 5 6 Manufacture 6 7 Requirements
11、 . 6 7.1 Chemical composition . 6 7.2 General condition of the product 6 8 Sampling . 6 8.1 General 6 8.2 Frequency and number of tests . 6 9 Testing . 6 9.1 Determination of the chemical composition . 6 9.2 Rounding of results of chemical analysis . 6 10 Inspection documentation . 8 11 Marking . 8
12、12 Packaging and surface protection . 8 13 Complaints . 8 Annex A (informative) Comparison of cast unalloyed magnesium material designations according to EN 12421 and ISO 8287 3 9 Annex B (informative) Significant technical changes between this European Standard and the previous edition 10 Bibliogra
13、phy . 11 BS EN 12421:2017EN 12421:2017 (E) 3 European foreword This document (EN 12421:2017) has been prepared by Technical Committee CEN/TC 190 “Foundry Technology”, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publicati
14、on of an identical text or by endorsement, at the latest by September 2017, and conflicting national standards shall be withdrawn at the latest by September 2017. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be he
15、ld responsible for identifying any or all such patent rights. This document supersedes EN 12421:1998. Within its programme of work, Technical Committee CEN/TC 190 requested CEN/TC 190/WG 9 “Cast magnesium” to revise: EN 12421:1998, Magnesium and magnesium alloys Unalloyed magnesium Annex B provides
16、details of significant technical changes between this European Standard and the previous edition. According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyp
17、rus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and t
18、he United Kingdom. BS EN 12421:2017EN 12421:2017 (E) 4 Introduction This European Standard classifies cast unalloyed magnesium into a number of grades suitable for the applications for which they might be used. Four new grades of cast unalloyed magnesium, as specified in ISO 8287:2011 3, has been ad
19、ded. In this European Standard a new designation system by number, as established in EN 1754 1, is given. NOTE This designation system by number is based on the structure and rules of EN 100272 2 and so corresponds with the European numbering system for steel and other materials. BS EN 12421:2017EN
20、12421:2017 (E) 5 1 Scope This European Standard specifies the grades and corresponding requirements for cast unalloyed magnesium. This European Standard specifies the chemical composition, designation, testing, marking and inspection documentation. 2 Normative references The following documents, in
21、whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 10204, Metallic products - Types
22、 of inspection documents EN ISO 80000-1:2013, Quantities and units - Part 1: General (ISO 80000-1:2009 + Cor 1:2011) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 unalloyed magnesium material where the minimum magnesium content is 99,0 % (m
23、ass fraction) 3.2 cast unalloyed magnesium unalloyed magnesium processed in various moulds 4 Designations The material shall be designated either by symbol or by number, as given in Table 1. NOTE The comparison of EN 12421 grade designations with the designations from the ISO standard for unalloyed
24、magnesium, ISO 8287 3, is given in Annex A. 5 Order information The following information shall be supplied by the purchaser: a) the number of this European Standard;b) the designation of the material;c) product shape;d) quantity (e.g. number, mass, etc.);e) any special requirements.All requirements
25、 shall be agreed between the manufacturer and the purchaser by the time of acceptance of the order. BS EN 12421:2017EN 12421:2017 (E) 6 6 Manufacture The manufacturing process shall be left to the discretion of the manufacturer unless otherwise agreed at the time of ordering. NOTE The manufacturing
26、process covers all operations up to the delivery of the product. 7 Requirements 7.1 Chemical composition The chemical composition of cast unalloyed magnesium shall be in accordance with the requirements as given in Table 1. If not otherwise specified in the enquiry and order, the chemical compositio
27、n of the cast unalloyed magnesium shall relate to that of the samples taken from the melt at the time of pouring. 7.2 General condition of the product The product shall have a clean surface, in accordance with an agreement between the manufacturer and the purchaser, and shall be free from visible an
28、d internal imperfections to a level also agreed between the manufacturer and the purchaser. 8 Sampling 8.1 General Samples for chemical analysis shall be made from the same material as that used to produce the material which they represent. All samples shall be adequately marked to guarantee full tr
29、aceability to the material which they represent. The samples for the determination of the chemical composition shall be cast in a manner which ensures accurate results. 8.2 Frequency and number of tests Samples, representative of the material, shall be produced at a frequency in accordance with the
30、process quality assurance procedures adopted by the manufacturer or as agreed with the purchaser. The quality assurance procedures for sampling should be based on appropriate and recognized statistical principles. 9 Testing 9.1 Determination of the chemical composition The methods used to determine
31、the chemical composition of the material shall be in accordance with standardized methods or validated procedures. 9.2 Rounding of results of chemical analysis In recording the result obtained for any value specified in this European Standard, it shall be expressed to the same number of decimal plac
32、es as the corresponding value in this European Standard. Rounding shall be carried out as specified in EN ISO 80000-1:2013, B.2 and B.3. In B.3, it is left to the discretion of the manufacturer as to whether to use Rule A or B, unless the use of one of the rules has been agreed at the time of accept
33、ance of the order. BS EN 12421:2017Table1 Chemicalcompositionofcastunalloyed magnesiumMaterialdesignationChemicalcomposition%(mass fraction)SymbolNumberElementAlMnSiFeCuNiPbSnNaCaZnOtherseachMg aEN-MB99,53.5201min.max.0,10,10,10,10,10,010,010,010,0599,5EN-MB99,80-A3.5202min.max.0,050,050,050,050,020
34、,0010,010,010,0030,0030,050,0599,80EN-MB99,80-B3.5203min.max.0,050,050,050,050,020,0020,010,010,050,0599,80EN-MB99,80-C3.5204min.max.0,050,10,020,0040,0050,0010,0199,80EN-MB99,903.5205min.max.0,020,030,030,0040,0040,0010,0199,90EN-MB99,95-A3.5206min.max.0,010,0060,0060,0030,0050,0010,0050,0050,0030,
35、0030,0050,00599,95EN-MB99,95-B3.5207min.max.0,010,010,010,0050,0050,0010,0050,0050,010,00599,95EN-MB99,983.5208min.max.0,0040,0020,0030,0020,00050,00050,0010,0040,0040,00599,98EN-MB99,993.5209min.max.0,0020,0020,0030,0020,00030,00030,0020,0020,0030,00399,99NOTEThematerialdesignationisinaccordancewit
36、hEN17541.aBalanceBS EN 12421:2017 EN 12421:2017 (E) 7BS EN 12421:2017EN 12421:2017 (E) 8 10 Inspection documentation When requested by the purchaser and agreed with the manufacturer, the manufacturer shall issue for the products the appropriate inspection documentation according to EN 10204. The mat
37、erial manufacturer is responsible for affirming conformity with the specification for the material ordered. 11 Marking Unless otherwise agreed, each product, or bundle of products, shall be clearly marked with the following: manufacturers identification; material designation; melt identification; un
38、it weight (mass). The method of marking is left to the discretion of the manufacturer. Markings shall be indelible and shall not be a source of contamination. 12 Packaging and surface protection Packaging and/or surface protection, if any, for the transport or storage of the products, shall be at th
39、e discretion of the manufacturer unless a specific agreement has been made by the time of acceptance of the order. The packaging method should ensure the full protection of the products until their final destination. 13 Complaints In case of any complaint, the manufacturer shall be able to examine t
40、he validity of the complaint within a reasonable time. If applicable, the sampling conditions and the test methods used to evaluate the disputed characteristic shall be in accordance with the requirements given in Clause 8 and Clause 9. Unless otherwise agreed, complaints on technical matters may on
41、ly be made when the specified requirements are not met. BS EN 12421:2017EN 12421:2017 (E) 9 Annex A (informative) Comparison of cast unalloyed magnesium material designations according to EN 12421 and ISO 8287 3 This informative annex compares the material designation of the standardized grades of c
42、ast unalloyed magnesium based on the EN and ISO designations, see Table A.1. Table A.1 Material designations of cast unalloyed magnesium EN 12421:2017 EN 12421:1998 ISO 8287:2011 symbol number symbol number EN-MB99,5 3.5201 EN-MB99,5 EN-MB10010 ISO Mg 99,5 EN-MB99,80-A 3.5202 EN-MB99,80-A EN-MB10020
43、 ISO Mg 99,80A EN-MB99,80-B 3.5203 EN-MB99,80-B EN-MB10021 ISO Mg 99,80B EN-MB99,80-C 3.5204 a aISO Mg 99,80C EN-MB99,90 3.5205 a aISO Mg 99,90 EN-MB99,95-A 3.5206 EN-MB99,95-A EN-MB10030 ISO Mg 99,95A EN-MB99,95-B 3.5207 EN-MB99,95-B EN-MB10031 ISO Mg 99,95B EN-MB99,98 3.5208 a aISO Mg 99,98 EN-MB9
44、9,99 3.5209 a aISO Mg 99,99 aNot included in EN 12421:1998. BS EN 12421:2017EN 12421:2017 (E) 10 Annex B (informative) Significant technical changes between this European Standard and the previous edition Table B.1 Significant technical changes between this European Standard and the previous edition
45、 Clause/Paragraph/Table/Figure Change Clause 8 Requirements regarding sampling added. Clause 12 Requirements regarding packaging and surface protection added. Table 1 Addition of 4 new grades of cast unalloyed magnesium. Structure of designation by numbers has been changed. Annex A Informative Annex
46、 A for the comparison of cast unalloyed magnesium material designations according to EN 12421 and ISO designation added. NOTE The technical changes referred include the significant technical changes from the EN revised but is not an exhaustive list of all modifications from the previous version. BS
47、EN 12421:2017EN 12421:2017 (E) 11 Bibliography 1 EN 1754, Magnesium and magnesium alloys - Designation system for anodes, ingots and castings - Material symbols and material numbers 2 EN 10027-2, Designation systems for steels - Part 2: Numerical system 3 ISO 8287:2011, Magnesium and magnesium alloy
48、s Unalloyed magnesium Chemical composition This page deliberately left blankThis page deliberately left blankBSI is the national body responsible for preparing British Standards and other standards-related publications, information and services.BSI is incorporated by Royal Charter. British Standards
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