1、BRITISH STANDARD AEROSPACE SERIES CONFIRMED SEPTEMBER 1980 BS 3L 122:1970 (Superseding BS2L122) Specification for Ingots and castings of magnesium 8 % aluminium-zinc- manganese alloy (Solution treated) (Al 8, Zn 0.5, Mn 0.3) UDC 629.7:669.721.571574-4-14BS3L122:1970 This British Standard, having bee
2、n approved by the AerospaceIndustry StandardsCommittee, was published underthe authorityofthe Executive Boardof the Institutionon 26March1970 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference ACE/27 Draft for comment 69/20612 ISBN 0 580 05868 9 A Briti
3、sh 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 pages This document comprises a front
4、 cover, an inside front cover, pagesi andii, pages 1and2 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. Amendments issued since publication Amd. No. Date Comments
5、BS3L122:1970 BSI 01-2000 i Contents Page 1 Inspection and testing procedure 1 2 Chemical composition 1 3 Heat treatment 1 4 Mechanical properties 2 5 Protection against corrosion 2ii blankBS3L122:1970 BSI 01-2000 1 1 Inspection and testing procedure The ingots and castings shall be inspected and tes
6、ted in accordance with the relevant requirements of BSL101 as follows: 2 Chemical composition 2.1 Ingots. The chemical composition of the ingots shall be: 2.2 Castings. The chemical composition of the castings shall be: 3 Heat treatment 3.1 The castings and test samples shall be heat-treated togethe
7、r as follows: 1) Heat at a temperature not exceeding435 C for not less than12hours. 2) Cool in air or quench in oil or water, at the option of the manufacturer. Ingots Sections 1 and 2 Castings not subject to cut-up testing Sections 1 and 3 Castings subject to cut-up testing Sections 1 and 4 Element
8、 Per cent min. max. Aluminium 7.5 8.5 Zinc 0.3 1.0 Manganese 0.2 0.4 Copper 0.15 Silicon 0.2 Iron 0.03 Nickel 0.01 Total of copper, silicon, iron and nickel 0.35 Tin 0.1 Magnesium The remainder Element Per cent min. max. Aluminium 7.5 9.0 Zinc 0.3 1.0 Manganese 0.15 0.4 Copper 0.15 Silicon 0.3 Iron
9、0.05 Nickel 0.01 Total of copper, silicon, iron and nickel 0.40 Tin 0.1 Magnesium The remainderBS3L122:1970 2 BSI 01-2000 4 Mechanical properties NOTEThe tensile test values specified for test pieces machined from separately cast test samples may not be realized in certain portions of castings. The
10、mechanical properties obtained from separately cast test samples, selected and prepared in accordance with the relevant requirements of BS L 101, shall be not less than the following values: 5 Protection against corrosion The material shall be protected before despatch by one of the methods given in
11、 Ministry of Technology aircraft process specification D.T.D. 911. The method to be used shall be selected by the purchaser in accordance with the recommendations of DGQA Technical Memorandum M.6 and shall be stated on the order. Test sample 0.2 % proof stress Tensile strength Elongation MN/m 2 MN/m
12、 2 % Sand cast 80 200 7 Chill cast 80 230 10 NOTE1 MN/m 2= 0.102 kgf/mm 2= 0.1 hbar = 0.065 tonf/in 2 . Information on SI units is given in BS350, “Conversion factors and tables”, and PD5686, “The use of SI units”.blankBS 3L 122:1970 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstit
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