1、BRITISH STANDARD AEROSPACE SERIES CONFIRMED SEPTEMBER 1994 BS 2L 99:1972 (Superseding BS L 99 and D.T.D. 5028) Incorporating Amendment Nos. 1 and 2 Specification for Ingots and castings of aluminium-silicon- magnesium alloy (Solution treated and precipitation treated) (Si 7, Mg 0.3) UDC 629.7:669.71
2、5782721-412-14BS2L 99:1972 This British Standard, having been approved by the Aerospace Industry Standards Committee, was published under the authorityof the Executive Boardof the Institution on 30March1972 BSI 01-2000 The following BSI references relate to the work on this standard: Committee refer
3、ence ACE/27 Draft for comment 70/16281 ISBN 0 580 07080 8 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 le
4、gal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 and 2 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 fr
5、ont cover. Amendments issued since publication Amd. No. Date of issue Comments 3739 September 1981 6543 March 1991 Indicated by a sideline in the marginBS2L 99:1972 BSI 01-2000 i Contents Page 1 Inspection and testing procedure 1 2 Chemical composition 1 3 Heat treatment 1 4 Mechanical properties 2i
6、i blankBS2L 99:1972 BSI 01-2000 1 1 Inspection and testing procedure The ingots and castings shall be inspected and tested in accordance with the relevant requirements of BS L101 as follows: 2 Chemical composition 2.1 Ingots 2.1.1 The chemical composition of the ingots shall be: 2.1.2 The ingot shal
7、l be grain refined with titanium or with titanium and boron. The ingot maker shall declare the grain refining element(s) used. 2.2 Castings. The chemical composition of the castings shall be: NOTESpecific modifying elements may be added in sufficient quantities to provide the necessary casting mater
8、ial quality. 3 Heat treatment 3.1 The castings and test samples shall be heat treated together as follows: 1) Heat at a temperature of540 5 C for not less than12 hours. 2) Quench into water at a temperature of not less than65 C or in a polymer quenchant at a temperature not greater than30 C. NOTE Th
9、e use of a polymer quenchant as an alternative to water should be agreed by the purchaser. 3) Re-heat at a temperature of155 5 C for not less than4 hours. 4) Cool in air. 3.2 Where a polymer quenchant has been used in3.1 2) the nature of the quenchant shall be defined on the certificate of conformit
10、y for the castings. 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 % min. max. Copper 0.10 Magnesium 0.25 0.45 Silicon 6.5 7.5 Iron 0.15 Manganese 0.10 Nickel 0.10 Zinc 0.10 Lead 0.05 Tin 0.05 Titanium 0.20
11、Others each 0.05 Others total 0.15 Aluminium The remainder Element % min. max. Copper 0.10 Magnesium 0.20 0.45 Silicon 6.5 7.5 Iron 0.20 Manganese a 0.10 Nickel a 0.10 Zinc a 0.10 Lead a 0.05 Tin a 0.05 Titanium a 0.20 Aluminium The remainder a The proportion of casts in which this element is determ
12、ined may be reduced, subject to the discretion of the Inspecting Authority, to not less than one in five of those analysed.BS2L 99:1972 2 BSI 01-2000 4 Mechanical properties 4.1 Tensile test NOTEThe tensile test values specified for test pieces machined from separately cast test samples may not be r
13、ealized in certain portions of castings. 4.1.1 Separately cast test samples. The mechanical properties obtained from separately cast test samples, selected and prepared in accordance with the relevant requirements of BSL101, shall be not less than the following values: 4.1.2 Cut-up test samples. Unl
14、ess otherwise agreed between the supplier and the purchaser and stated in the Inspection Schedule in accordance with BS L101, the mechanical properties obtained from cut-up test samples, selected and prepared in accordance with the relevant requirements of BS L 101, shall be not less than the follow
15、ing values: 4.2 Hardness test. The hardness of castings heat treated with unrelated test samples, in accordance with clause3, shall be not less than the following values: Test sample 0.2 % proof stress Tensile strength Elongation N/mm 2 N/mm 2 % Sand cast 185 230 2 Chill cast 200 280 5 Position of t
16、est samples 0.2 % proof stress Tensile strength Elongation N/mm 2 N/mm 2 % Designated locations 200 260 5 Other locations 180 225 3 NOTE 1N/mm 2= 1 MN/m 2= 0.102kgf/mm 2= 0.1hbar = 0.065tonf/in 2 . Information on SI units is given in BS3763, “TheInternational System of units (SI)”; see also BS350, “
17、Conversion factors and tables”. Sand cast 75 HB Chill cast 80 HBblankBS 2L 99:1972 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the intern
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