1、BRITISH STANDARD AEROSPACE SERIES BS 2L 169:2002 Ingots (as cast) and castings (solution treated and artificially aged) of aluminium- silicon-magnesium alloy (Si 7, Mg 0.6) ICS 49.025.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS 2L 169:2002 This British Standard, havin
2、g been prepared under the direction of the Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 18 June 2002 BSI 18 June 2002 First published January 1986 Second edition June 2002 The following BSI references relate to
3、the work on this standard: Committee reference ACE/24 Draft for comment 82/79983 DC ISBN 0 580 39805 6 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee ACE/24, Wrought and cast light alloys for aerospace, upon which the fo
4、llowing bodies were represented: Aluminium Federation Aluminium Stockholders Association Association of Light Alloy Refiners Limited BNF Metals Technology Centre British Forging Industry Association British Industrial Fasteners Federation British Investment Casting Trade Association Institute of Bri
5、tish Foundrymen Light Metal Founders Association Magnesium Industry Council Ministry of Defence Society of British Aerospace Companies Limited Amendments issued since publication Amd. No. Date of issue CommentsBS 2L 169:2002 BSI 18 June 2002 i Contents Page Committees responsible Inside front cover
6、Foreword ii 1S c o p e 1 2 Inspection and testing procedure 1 3 Chemical composition 1 4 Conditions of supply 1 5 Heat treatment 2 6 Mechanical properties of castings 2 Table 1 Chemical composition of ingots and castings 1 Table 2 Tensile properties of separately cast samples 2 Table 3 Tensile prope
7、rties of cut-up and integrally cast test samples 2 Bibliography 3BS 2L 169:2002 ii BSI 18 June 2002 Foreword This British Standard is a new edition of BS L 169:1986 and incorporates technical changes only. It does not reflect a full review or revision of the standard, which will be undertaken in due
8、 course. It has been prepared by Technical Committee ACE/24, Wrought and cast light alloys for aerospace, and supersedes BS L 169:1986, which is withdrawn. This new edition deletes beryllium from the chemical composition of ingots and castings and adjusts the requirements for grain refinement. This
9、publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front
10、 cover, pages i and ii, pages 1 to 3 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.BS 2L 169:2002 BSI 18 June 2002 1 1 Scope This British Standard specifies the inspection and testing procedure, chemical composition, heat treatment
11、and mechanical properties applicable to ingots and castings of aluminium-silicon-magnesium alloy. NOTE 1 The title of the publication referred to in this standard is given on the inside back cover. NOTE 2 The latest revision of an Aerospace Series standard is indicated by a prefix number. 2 Inspecti
12、on and testing procedure The inspection and testing procedure shall be as specified in the relevant sections of the latest edition of BS L 101. 3 Chemical composition 3.1 The chemical composition of ingots and castings shall be as given in Table 1. Table 1 Chemical composition of ingots and castings
13、 3.2 Grain refinement shall be carried out using titanium and/or boron. 3.3 The release documentation for ingots shall include a statement of grain refining elements used, if any. 4 Conditions of supply 4.1 Ingots shall be supplied as cast. 4.2 Castings shall be supplied fully heat treated in accord
14、ance with Clause 5 unless otherwise stated on the order. Element Composition by mass Min. % Max. % Copper 0.10 Magnesium 0.50 0.75 Silicon 6.5 7.5 Iron Ingots Castings 0 . 1 5 0 . 2 0 Manganese 0.10 Nickel 0.05 Zinc 0.10 Lead 0.05 Tin 0.05 Titanium 0.10 0.20 Others each 0.05 Others total 0.15 Alumin
15、ium Remainder NOTE 1 Specific modifying elements may be added in sufficient quantities to provide the necessary casting material quality. NOTE 2 Up to 0.07 % beryllium may be added to the melt by agreement with the purchaser. BS 2L 169:2002 2 BSI 18 June 2002 5 Heat treatment 5.1 The castings and te
16、st samples shall be heat treated together in accordance with a) to d) as follows. a) Solution treat at a temperature of 540 5 C for not less than 10 h. b) Quench in water or in a polymer quenchant at a temperature not greater than 30 C. NOTE The use of a polymer quenchant as an alternative to water
17、should be agreed by the purchaser. c) Artificially age at a temperature in the range 155 C to 165 C for not less than 2 h. The temperature selected shall be maintained within a tolerance of 5 C. d) Cool in air. 5.2 Where a polymer quenchant has been used in 5.1b), the nature of the quenchant shall b
18、e defined on the certificate of conformity for the castings. 6 Mechanical properties of castings 6.1 Tensile tests 6.1.1 The mechanical properties obtained from separately cast test samples, selected and prepared in accordance with the relevant requirements of the latest edition of BS L 101, shall b
19、e not less than those given in Table 2, when heat treated in accordance with Clause 5. Table 2 Tensile properties of separately cast samples 6.1.2 The mechanical properties obtained from cut-up and integrally cast test samples, heat treated in accordance with Clause 5, and selected and prepared in a
20、ccordance with the relevant requirements of the latest edition of BS L 101 shall be not less than those given in Table 3 or shall be as stated on the drawing for the casting or on the Inspection Schedule in accordance with the latest edition of BS L 101. 6.2 Hardness test The hardness of castings, h
21、eat treated in accordance with Clause 5 shall be not less than the following: Table 3 Tensile properties of cut-up and integrally cast test samples Test sample 0.2 % proof stress min. MPa Tensile strength min. MPa Elongation min. % Sand Investment cast Chill cast 240 240 240 290 300 320 3.0 3.5 4.0
22、a) sand and investment cast 80 HB, b) chill cast 85 HB. Casting thickness (t) mm Location of test samples 0.2 % proof stress min. MPa Tensile strength min. MPa Elongation % t 5 Designated locations 250 320 5 Other locations 230 300 3 5 t 20 Designated locations 240 300 3 Other locations 220 270 2 t
23、20 As stated on the drawing for the casting or on the Inspection ScheduleBS 2L 169:2002 BSI 18 June 2002 3 Bibliography Standards publication BS 4L 101, Procedure for inspection, testing and acceptance of aluminium-base and magnesium-base ingots and castings. 1) 1) Use the latest available edition o
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