1、BRITISH STANDARD AEROSPACE SERIES BS L 174: 1991 Specification for Castings of aluminium-silicon- magnesium alloy, sand cast (solution treated and precipitation treated to an overaged (T7) condition)BSL174:1991 This British Standard, having been prepared under the directionof the Aerospace Standards
2、 Policy Committee, waspublished under theauthorityof the StandardsBoardand comesintoeffect on 30April 1991 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference ACE/24 Draft for comment 90/72178 DC ISBN 0 580 19391 8 Committees responsible for this British
3、Standard The preparation of this British Standard was entrusted by the Aerospace Standards Policy Committee (ACE/-) to Technical Committee ACE/24, upon which the following bodies were represented: Aluminium Federation Aluminium Stockholders Association Association of Light Alloy Refiners Limited BNF
4、 Metals Technology Centre British Forging Industry Association British Industrial Fasteners Federation British Investment Casting Trade Association Institute of British Foundrymen Light Metal Founders Association Magnesium Industry Council Ministry of Defence Society of British Aerospace Companies L
5、td. Amendments issued since publication Amd. No. Date CommentsBSL174:1991 BSI 01-2000 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 References 1 3 Technical requirements 1 Table 1 Technical requirements for sand cast Al-Si-Mg alloy, T7 condition 2BSL174:1991 ii BS
6、I 01-2000 Foreword This British Standard has been prepared under the direction of the Aerospace Standards Policy Committee. 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
7、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 cover, pages i and ii, pages1 to 3 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated
8、. This will be indicated in the amendment table on the inside front cover.BSL174:1991 BSI 01-2000 1 1 Scope This British Standard specifies the inspection and testing procedure, chemical composition, heat treatment and mechanical properties for sand castings of aluminium-silicon-magnesium alloy in a
9、n overaged (stabilized) condition. 2 References This standard makes reference to the following publications: BS L 99, Specification for ingots and castings of aluminium-silicon-magnesium alloy (solution treated and precipitation treated) (Si 7, Mg 0.3). BS L 101, Procedure for inspection, testing an
10、d acceptance of aluminium-base and magnesium-base ingots and castings. BS 5555, Specification for SI units and recommendations for the use of their multiples and of certain other units. BS 5775, Specification for quantities, units and symbols Part 0: General principles. BS EN 2500, Instructions for
11、the drafting and use of metallic material standards Part 1: General requirements Part 2: Aluminium, aluminium alloys and magnesium alloys 1) . 3 Technical requirements 3.1 The castings to this standard shall comply with the technical requirements specified in Table 1. All castings supplied shall com
12、ply with requirements appropriate to its dimensions and condition as specified in the standard given in line 5.1 of Table 1. 3.2 Symbols and units in Table 1 shall be interpreted in accordance with BS 5555, BS 5775-0 or BSEN2500. 1) In preparation.BSL174:1991 2 BSI 01-2000 Table 1 Technical requirem
13、ents for sand cast Al-Si-Mg alloy, T7 condition 1 Material designation 2 Chemical composition% Element Si Fe Cu Mn Mg Zn Ti Be Others (1) Al min. 6.5 0.25 0.04 each total base max. 7.5 0.20 0.20 0.10 0.45 0.10 0.25 0.07 0.05 0.15 3 Method of melting (2) 4 Form Method of production Limit dimensions (
14、mm) Sand cast 5 5.1 Technical specification BS L101 5.2 Dimensional standard 6 6.1 Delivery condition and heat treatment T7 Solution treat = 540 5 C/t U 12h Water quench U 65 C (3) Stabilize 215 C k k 230 C/2 h k t k 4h/air cool 6.2 Delivery condition code 7 Use condition and heat treatment T7 As de
15、livery condition Characteristics 8 Sampling Test piece Heat treatment T7 (4) T7 (5) T7 (6) 9 Dimensions concerned mm Wall thickness k 20 (7) 10 Thickness of cladding on each face % 11 Direction of sample 12 Tensile Temperature C Room temperature 13 Proof stress R p0.2 MPa U 170 U 170 U 190 14 Streng
16、th R m MPa U 210 U 210 U 230 15 Elongation A % U 3 U 2.5 U 3 16 Reduction of area Z % Notes (see line 98) (1) (2) (3) (4) (5) (6) (7) BSL174:1991 BSI 01-2000 3 Table 1 Technical requirements for sand cast Al-Si-Mg alloy, T7 condition 1 Material designation 2 Chemical composition% Element Si Fe Cu Mn
17、 Mg Zn Ti Be Others (1) Al min. 6.5 0.25 0.04 each total base max. 7.5 0.20 0.20 0.10 0.45 0.10 0.25 0.07 0.05 0.15 Characteristics (concluded) 17 Hardness 65HB (for information) 18 Shear strength R c MPa 19 Bending k 20 Impact strength 21 Creep Temperature C 22 Time h 23 Stress a MPa 24 Elongation
18、a % 25 Rupture stress R MPa 26 Elongation at rupture A % 27 Notes (see line 98) (1) (2) (3) (4) (5) (6) (7) 97 Designation 98 Notes (1) Specific modifying elements may be added in sufficient quantities to provide the necessary casting material quality. (2) Where ingot for melting is required it shal
19、l be in accordance with BSL99. (3) Polymer quenchant at k 30 C may be used with the agreement of the purchaser. The nature of the quenchant shall be defined on the certificate of conformity for the castings. (4) Properties determined on separately cast test pieces. (5) Properties determined on non-d
20、esignated areas cut from castings. (6) Properties determined on designated areas cut from castings. (7) For thickness greater than 20 mm properties shall be agreed with the purchaser. 99 Typical use BS L174: 1991 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the inde
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