1、BRITISH STANDARD AEROSPACE SERIES BS 2L 77: 1971 (Superseding BSL77) Specification for Forging stock and forgings of aluminium- copper-magnesium- silicon-manganese alloy (Solution treated and precipitation treated) (Cu 4.4, Mg0.5, Si 0.7, Mn 0.8) UDC 629.7:669.715372178274-4-134BS2L 77:1971 This Bri
2、tish Standard, having been approved by the AerospaceIndustry StandardsCommittee, was published under the authorityofthe Executive Boardof the Institution on 31 August 1971 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference ACE/24 Draft for comment 69/23
3、023 ISBN 0580 06496 4 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 pages Th
4、is document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 3 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 pu
5、blication Amd. No. Date of issue CommentsBS2L 77:1971 BSI 01-2000 i Contents Page 1 Inspection and testing procedure 1 2 Quality of material 1 3 Chemical composition 1 4 Condition 1 5 Heat treatment 1 6 Mechanical properties 2 Appendix A British Standards covering other forms of material of similar
6、composition 3ii blankBS2L 77:1971 BSI 01-2000 1 NOTEOther forms of material of similar composition are covered by British Standards as listed in Appendix A. 1 Inspection and testing procedure This British Standard shall be used in conjunction with the relevant sections of BS L 100 as follows: 2 Qual
7、ity of material The material shall be made from aluminium and alloying constituents, with or without approved scrap, at the discretion of the manufacturer. 3 Chemical composition The chemical composition of the material shall be: 4 Condition 4.1 Forging stock. Cast billets and slabs for hot working
8、and extruded bars, sections and hot-rolled plate for forging shall be supplied non-heat treated. 4.2 Forgings. Unless otherwise agreed between the manufacturer and the purchaser and stated on the order, forgings shall be supplied solution treated and precipitation treated. 5 Heat treatment The forgi
9、ngs shall be heat treated as follows: 1) Solution treat by heating at a temperature of 500 5 C and quenching in water at a temperature notless than 40 C not more than 70 C, unless otherwise agreed by the parent design firm and the manufacturer. NOTEIf a water quenching temperature below 40 C is used
10、, high residual stress and cracking may result, particularly in large and/or complicated forgings. For these reasons it is desirable to quench in water at as high a temperature as practicable. If a water quenching temperature above 70 C is agreed, the level of the mechanical properties in the forgin
11、g may be lower than that normally expected and the use of the AX or BX testing procedure is recommended. Quenching above 70 C may also increase the susceptibility of the material to intercrystalline corrosion. Cast billets and slabs for hot working Sections 1 and 2 Extruded bars and sections for for
12、ging Sections 1 and 3 Hot-rolled plate for forging Sections 1 and 13 Forgings Sections 1 and 7 Element % min. max. Copper 3.9 5.0 Magnesium 0.20 0.8 Silicon 0.50 0.90 Iron 0.5 Manganese 0.40 1.2 Nickel a 0.2 Zinc a 0.2 Lead a 0.05 Tin a 0.05 Titanium plus Zirconium a 0.2 Chromium a 0.10 Aluminium Th
13、e remainder a Subject to the discretion of the Inspecting Authority, determination of these elements need be made on a small proportion only of the samples analysed.BS2L 77:1971 2 BSI 01-2000 2) Precipitation treat by heating uniformly for the requisite period at a temperature between 160 C and190 C
14、. NOTEThe following temperatures and times at temperature have been found appropriate: 6 Mechanical properties 6.1 Tensile test. Unless they are required by BS L 100 to be fixed by agreement between the manufacturer and the purchaser, the mechanical properties obtained from test pieces selected and
15、prepared in accordance with the relevant requirements of BS L 100 shall be not less than the following values: 6.2 Hardness test. The Brinell hardness number of forgings and of forged test pieces, heat treated in accordance with Clause 5, shall be not less than 134. Temperature Time at temperature C
16、 hours 165 175 185 12 to 18 9 to 12 3 to6 Material represented Test sample prepared by Diameter or minor sectional dimension of forging stock 0.2 % proof stress Tensile strength Elongation on gauge length of 50 mm 5.65 mm N/mm 2 N/mm 2 % % Extruded forging stock Forgings made from: Cast billets F Al
17、l sizes 395 450 6 6 Hot-rolled plate Extruded stock Over Up to and including Extruded forging stock Forgings made from extruded stock 10 380 430 6 10 20 400 450 6 6 M 20 75 420 460 6 75 150 390 430 5 150 200 350 400 5 M = machining F = forging NOTE1N/mm 2= 1 MN/m 2= 0.102 kgf/mm 2= 0.1 hbar = 0.065
18、tonf/in 2 . Information on SI units is given in BS 3763, “TheInternational System of units (SI)” and in PD 5686, “The use of SI units”. See also BS 350, “Conversion factors and tables”. S o BS2L 77:1971 BSI 01-2000 3 Appendix A British Standards covering other forms of material of similar compositio
19、n Form Solution treated and aged at room temperature Solution treated and precipitation treated Supplied for solution treatment by the user Bars and extruded sections (not exceeding 200 mm diameter or minor sectional dimension) BSL102 BSL65 Forging stock and forgings BSL103 Hexagonal bars for nuts,
20、couplings and hollow machined parts (free from peripheral and asymmetriccoarse grain) BSL87 Sheet and strip BSL 70 BSL 104 BS L 106 a Aluminium-coated sheet and strip BSL72 BS L 73 BS L 107 a Close toleranced sheet and strip (aluminium-coated) BS L 89 BS L 90 BS L 108 a Tube (not exceeding 10 mm wal
21、l thickness) BS L 105 BS L 63 Wire for solid, cold-forged rivets (not exceeding 10 mm diameter) BS L 37 Plate: controlled stretched BSL 93 Plate: not controlled stretched BS L 94 a In course of preparation.BS 2L 77: 1971 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is
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