1、BRITISH STANDARD AEROSPACE SERIES BS L 173:1991 Specification for Castings of aluminium-silicon- magnesium alloy, chill cast (solution treated and precipitation treated to an overaged(T7) condition)BSL173:1991 This British Standard, having been prepared under the directionof the Aerospace Standards
2、Policy Committee, waspublished under the authorityof the Standards Boardand comes into effect on 30 April 1991 BSI 02-2000 The following BSI references relate to the work on this standard: Committee reference ACE/24 Draft for comment 90/72179 DC ISBN 0 580 19390 X Committees responsible for this Bri
3、tish 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 Limite
4、d BNF 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 Compan
5、ies Ltd. Amendments issued since publication Amd. No. Date CommentsBSL173:1991 BSI 02-2000 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 chill cast Al-Si-Mg alloy, T7 condition 2BSL173:1991
6、 ii BSI 02-2000 Foreword This British Standard has been prepared under the direction of the AerospaceStandards 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. Compli
7、ance 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 abackcover. This standard has been updated (see copyright date) and may have had amendments incorpora
8、ted. This will be indicated in the amendment table on the inside front cover.BSL173:1991 BSI 02-2000 1 1 Scope This British Standard specifies the inspection and testing procedure, chemical composition, heat treatment and mechanical properties for chill castings of aluminium-silicon-magnesium alloy
9、in an overaged (stabilized) condition. 2 References This standard makes reference to the following publications: BS L99, Specification for ingots and castings of aluminium-silicon-magnesium alloy (solution treated and precipitation treated) (Si 7, Mg 0.3). BSL 101, Procedure for inspection, testing
10、and acceptance of aluminium-base and magnesium-base ingots and castings. BS5555, Specification for SI units and recommendations for the use of their multiples and of certain other units. BS5775, Specification for quantities, units and symbols Part 0: General principles. BSEN2500, Instructions for th
11、e 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 compl
12、y 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 BS EN 2500. 1) In preparation.BSL173:1991 2 BSI 02-2000 Table 1 Technical requirem
13、ents for chill 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) Chill cast 5 5.1 Technical specification BS L 101 5.2 Dimensional standard 6 6.1 Delivery condition and heattreatment T7 Solution treat = 540 5 C/t U 12 h Water quench U 65 C (3) Stabilize 215 C k k 230 C/2 h k t k 4 h/air cool 6.2 Delivery condition code 7 Use condition and heat treatment T7 A
15、s delivery 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 p 0.2 MPa U 190 U 185 U 195 14 S
16、trength R m MPa U 250 U 240 U 255 15 Elongation A % U 5 U 4 U 5 16 Reduction of area Z % Notes (see line 98) (1) (2) (3) (4) (5) (6) (7) BSL173:1991 BSI 02-2000 3 Table 1 Technical requirements for chill cast Al-Si-Mg alloy, T7 condition 1 Material designation 2 Chemical composition% Element Si Fe C
17、u 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 Characteristics (concluded) 17 Hardness 70 HB (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 Elonga
18、tion 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
19、 shall be in accordance with BS L 99. The nature of the quenchant shall be defined on the certificate of conformity for the casting. (3) Polymer quenchant at k 30 C may be used with the agreement of the purchaser. (4) Properties determined on separately cast test pieces. (5) Properties determined on
20、 non-designated 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 L 173:1991 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is th
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