《BS 2L 500-1973.pdf》由会员分享，可在线阅读，更多相关《BS 2L 500-1973.pdf（40页珍藏版）》请在三一文库上搜索。
1、BRITISH STANDARD AEROSPACE SERIES BS 2L 500:1973 (Superseding BS L 500) Procedure for Inspection and testing of wrought magnesium-base alloys UDC 629.7:669.721.5 13:620.1 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:20:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2L 500:1973 This Br
2、itish Standard, having been approved by the Aerospace Industry Standards Committee, was published under the authority of the Executive Board on 12 March 1973 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference ACE/24 Draft for comment 71/33975 ISBN 0 580
3、 07672 5 Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:20:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2L 500:1973 BSI 01-2000i Contents Page Forewordii 1General requirements1 2Cast billets and slabs for hot working6 3Bars and
4、extruded sections for forging7 4Bars for machining and extruded sections9 5Forgings11 6Sheet and strip17 7Plate19 8Tube20 Appendix A Protection against corrosion21 Appendix B Notes on Table 1 to Table 825 Appendix C Notes on Table 9 and Table 1026 Table A.1 Standard routes for protection against cor
5、rosion24 Table B.3.1 Square and rectangular sections26 Table B.3.2 Regular sections: angle, channel, I and T sections26 Table 1 Tolerances on straightness of bars, regular sections and tube26 Table 2 Tolerances on twist of extruded sections27 Table 3 Tolerances on angles of regular sections27 Table
6、4 Tolerances on lengths of bars, extruded sections and tube27 Table 5 Tolerances on thickness of bars and regular sections28 Table 6 Tolerances on thickness of hollow sections (other than round tube)28 Table 7 Tolerances on diameters, overall widths and widths across flats of bars, regular sections
7、and hollow sections29 Table 8 Tolerances on open ends of channels and I beams30 Table 9 Tolerances on thickness of sheet and strip32 Table 10 Tolerances on thickness of plate33 Table 11 Cutting tolerances for sheet and plate33 Table 12 Shearing tolerances for strip33 Table 13 Tolerances on flatness
8、of plate34 Table 14 Tolerances on outside and inside diameters of extruded round tube34 Table 15 Tolerances on wall thickness of extruded round tube35 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:20:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2L 500:1973 ii BSI 01-2000 Foreword Thi
9、s British Standard has been compiled to cover the general inspection and testing requirements for wrought magnesium-base alloys to be used for aerospace purposes. The procedure set out herein is for use in conjunction with the relevant specifications in the “L” series. The procedure is also applicab
10、le to other specifications for wrought magnesium-base alloy products for aerospace purposes, where appropriate, such as those in the Ministry of Defence (Procurement Executive) D.T.D. Series. The first edition of this British Standard was published in January 1967. This revision has been undertaken
11、to bring the procedures in line with current industrial practice in the United Kingdom and with international inspection and testing procedures established in AICMA1), and also to take account of metrication in the magnesium industry. The principal alterations are the deletion of all references to i
12、mperial units, the complete revision of the tables of dimensional tolerances and the inclusion of detailed requirements relating to protection against corrosion. NOTEFor a limited period, material in imperial unit sizes will be available subject to negotiation regarding tolerances between the suppli
13、er and the purchaser. In general it is intended that these tolerances should be conversions of the tolerances given in the tables in this standard. This standard makes reference to the following specifications: British Standard BS A 4, Test pieces and test methods for metallic materials for aircraft
14、 Part 1: Tensile tests. Ministry of Defence (Procurement Executive) Specifications 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 itsel
15、f confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 35 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendme
16、nt table on the inside front cover. 1) Association Internationale des Constructeurs de Matriel Arospatial D.T.D.935Surface sealing of magnesium rich alloys D.T.D.5562Clear baking resin for surface sealing magnesium Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:20:08 GMT+00:00 2006, Uncon
17、trolled Copy, (c) BSI BS 2L 500:1973 BSI 01-20001 1 General requirements 1.1 Definitions For the purposes of this British Standard and associated material specifications the following definitions apply: 1.1.1 Materials 1.1.1.1 approved scrap scrap which is: a) derived from material the composition o
18、f which has been established with regard to the complete range of both the alloying elements and impurity elements appropriate to the class of alloy being made, and b) segregated and identifiable to the satisfaction of the Inspecting Authority. 1.1.1.2 bar a solid extruded section which is round, re
19、ctangular or regular polygonal in shape 1.1.1.3 billet or slab a cast product destined for subsequent hot working. A rectangular billet is usually called a slab 1.1.1.4 cast a) The product of one furnace melt; b) the product of one crucible melt; c) the product of a number of crucible or furnace mel
20、ts mixed prior to casting; d) the amount of metal tapped from the furnace without any further addition of metal having been made (when a continuous melting process is employed); or e) as may be otherwise defined by the Inspecting Authority. 1.1.1.5 coil a length of a product wound into a cylindrical
21、 or annular form for convenient handling 1.1.1.6 extruded length the length produced from one cast billet or, if a multi-hole die is used, each length produced from one cast billet 1.1.1.7 extruded section any extruded shape generally delivered in straight lengths 1.1.1.8 forging a shape produced by
22、 hammering or pressing, usually when hot, between open or closed dies 1.1.1.9 hollow section an extruded section which completely encloses a hollow or hollows 1.1.1.10 plate a rolled product of rectangular section over 6.0 mm thick, supplied flat and with less control of surface finish than applies
23、to sheet Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:20:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2L 500:1973 2 BSI 01-2000 1.1.1.11 regular section a solid extruded section which can be conveniently divided into approximate rectangles with measurable dimensions, e.g. angles, ch
24、annels, tees etc. The ratio of maximum thickness to minimum thickness of such regular sections does not exceed 4 : 1 (see Appendix B.2) 1.1.1.12 sheet a rolled product of rectangular section up to and including 6.0 mm thick, supplied flat 1.1.1.13 strip a rolled product of rectangular section up to
25、and including 3.0 mm thick, supplied in coil 1.1.1.14 tube a hollow section of uniform wall thickness 1.1.2 Other terms 1.1.2.1 batch material: a) from the same cast, b) of the same form, c) of the same nominal dimensions, except as otherwise permitted in the relevant section of this standard, d) if
26、 heat treated, that has been heat treated together, and e) in maximum quantities as stipulated in the relevant section of this standard. 1.1.2.2 certification confirmation by the manufacturer or supplier that the material conforms to the requirements of the relevant specification, drawing, order or
27、Inspection Schedule NOTEThe issue of certificates etc. is normally subject to the regulations of the Inspecting Authority. 1.1.2.3 harmful defect any defect prejudicial to the subsequent manufacture, fabrication or use of the material 1.1.2.4 inspecting authority the body responsible for authorizing
28、 the manufacturer or supplier to issue certification 1.1.2.5 inspection schedule a schedule of any special test requirements agreed between the supplier and the purchaser 1.1.2.6 inspector the individual responsible for the executive inspection and release of material 1.1.2.7 lateral curvature the d
29、eviation from straightness of a sheet or strip edge when the sheet or strip is laid flat 1.1.2.8 manufacturer the firm that produces the material in the form (billet, bar, forging, sheet etc.) in which it is consigned to the purchaser Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:20:08 G
30、MT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2L 500:1973 BSI 01-20003 1.1.2.9 supplier the firm (not necessarily the manufacturer) that consigns the material to the purchaser 1.2 Certification2) 1.2.1 The manufacturer shall supply to the purchaser the necessary certification2) in respect of all mate
31、rial governed by this British Standard and relevant material specifications. 1.2.2 Except as provided in 1.2.3, if any certification2) is issued by a supplier other than the manufacturer, such supplier shall hold the equivalent certification2) issued by the manufacturer of the material. 1.2.3 If a b
32、atch of material consigned by the manufacturer is subdivided by an approved supplier before re-consignment, the supplier shall carry out any consequent additional dimensional inspection and identification marking and shall certify accordingly. 1.3 Manufacture and freedom from defects 1.3.1 The mater
33、ial shall be made in accordance with the requirements of this British Standard and the relevant material specification. 1.3.2 The material shall be free from harmful defects. 1.3.3 Notwithstanding the previous acceptance of material as complying with the requirements of this British Standard, any ma
34、terial that is found at a later stage to contain harmful defects may be rejected. 1.4 Chemical composition 1.4.1 The chemical composition of the material shall comply with the requirements of the material specification. The values stipulated in the specification shall be applied in accordance with t
35、he instructions of the Inspecting Authority. Elements not quoted in the specification shall not be added for any purpose other than fluxing, degassing, grain refinement and the like. 1.4.2 Overall control of the chemical composition and the regulation of the use of scrap shall be such that the metho
36、d of analytical control adopted for each particular material shall enable the inspector to certify compliance with 1.4.1. 1.5 Mechanical properties of bars, extruded sections, sheet, strip, plate and tube 1.5.1 In the “L” series of specifications for magnesium-base alloys, the specified mechanical p
37、roperties for bars, extruded sections, sheet, strip and tube refer to the longitudinal direction, whilst those for plate refer to the transverse direction. The specified properties relate to test pieces machined from test samples selected in the defined manner and will not necessarily be realized wh
38、en tests are carried out on test pieces machined from test samples which do not conform to the requirements of this standard. Attention is directed to 1.6. 1.5.2 The mechanical properties in the transverse direction will usually differ from those in the longitudinal direction. When it is decided tha
39、t tests in a direction other than that normally specified are necessary, the required properties, the location of the test sample and the frequency of testing shall be agreed between the manufacturer and the purchaser and shall be stated on the order or Inspection Schedule. 1.6 Tensile test 1.6.1 Ge
40、neral 1.6.1.1 The test pieces, prepared as required by the following clauses, shall be tested in accordance with the requirements of BS A 4-1.1. The secondary methods of proof stress verification may be employed and the values obtained shall comply with the requirements of the material specification
41、 or, if appropriate, with requirements agreed between the manufacturer and the purchaser in accordance with this standard. The values stipulated in the specification shall be applied in accordance with the instructions of the Inspecting Authority. 2) As defined in 1.1.2.2. Licensed Copy: sheffieldun
42、 sheffieldun, na, Tue Nov 28 14:20:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2L 500:1973 4 BSI 01-2000 1.6.1.2 The test samples shall be selected and identified as directed by the inspector before they are removed from the material. 1.6.1.3 Except as otherwise required in the relevant section
43、 of this standard, the test samples shall not be heat treated or mechanically worked after they have been separated from the material they represent. 1.6.2 Bars, extruded sections and forgings 1.6.2.1 Except as provided in 1.6.2.2 and 1.6.2.3, the test piece shall be machined from the selected test
44、sample (see 1.6.2.4) to the dimensions of the largest practicable size of the proportional round test pieces shown in Table 1 of BS A 4-1.1. 1.6.2.2 Alternatively to 1.6.2.1, at the option of the manufacturer, round, square and hexagonal bars not exceeding 125 mm2 cross-sectional area shall be teste
45、d in full section or as near full section as possible: for these test pieces the elongation shall be measured on a gauge length of 5.65 or 50 mm, at the discretion of the manufacturer. The gauge length used shall be recorded on the manufacturers test report. 1.6.2.3 Alternatively to 1.6.2.1, at the
46、option of the manufacturer, for rectangular bars and extruded sections not exceeding 10 mm minor sectional dimension in the thickest part, a test piece of rectangular cross section shall be machined with maximum available thickness and 12.5 mm width or as near 12.5 mm as the section will permit. For
47、 these test pieces the elongation shall be measured on a gauge length of 5.65 or 50 mm, at the discretion of the manufacturer. The gauge length used shall be recorded on the manufacturers test report. 1.6.2.4 Unless otherwise stated in the specification, drawing or order the following requirements g
48、overn the location of test pieces: 1) For bars and for test samples representing forgings or bars for forging, up to and including 50 mm diameter or minor sectional dimension, the test piece shall be machined coaxially from the test sample. 2) For bars over 50 mm diameter or minor sectional dimensio
49、n, the longitudinal axis of the test piece shall be half way between the central axis and the outer surface of the test sample. 3) For extruded sections whose minor sectional dimension in the thickest part is not more than 50 mm, the test piece shall be machined from the thickest part of the section. The longitudinal axis of the test piece shall be equidistant from the longer sides and 25 mm (or as near 25 mm as is practicable) from a shorter side of the selected part of the section. 4) For extruded sections whose minor sectional dimens