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1、BRITISH STANDARD BS 2898:1970 Incorporating Amendment No. 1 Specification for Wrought aluminium And aluminium alloys for electrical purposes Bars, extruded round tube and sections UDC 669.71 42:621.3 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:49:49 GMT+00:00 2006, Uncontrolled Copy, (
2、c) BSI BS 2898:1970 This British Standard, having been approved by the Non-Ferrous Metals Industry Standards Committee, was published under the authority of the Executive Board on 31 March 1970 BSI 04-1999 First published, September 1957 First revision, March 1970 The following BSI references relate
3、 to the work on this standard: Committee reference NFE/24 Draft for comment 68/29134 ISBN 580 05789 5 Co-operating organizations The Non-ferrous Metals Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government
4、departments and scientific and industrial organizations: Aluminium Federation*Institution of Mechanical Engineers Association of Bronze and Brass Founders(Automobile Division) Association of Consulting EngineersInstitution of Mining and Metallurgy Board of TradeInstitution of Production Engineers Br
5、itish Bronze and Brass Ingot Manufacturers Institution of Structural Engineers AssociationLead Development Association British Electrical and Allied Manufacturers Light Metal Founders Association Association*London Metal Exchange British Lead Manufacturers AssociationMagnesium Industry Council Briti
6、sh Non-ferrous Metals FederationMinistry of Defence, Army Department British Non-Ferrous Metals FederationHigh Ministry of Defence, Navy Department Conductivity Copper GroupNational Brassfoundry Association British Non-ferrous Metals Research Non-ferrous Metal Stockists* AssociationPost Office* Copp
7、er Development AssociationRoyal Institute of British Architects Crown Agents for Overseas Governments andSociety of Motor Manufacturers and Traders AdministrationsLtd. Electric Cable Makers Confederation*Tin Research Institute Institute of British FoundrymenZinc Development Association Institute of
8、MetalsIndividual manufacturer The Government department and scientific and industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: British Railways BoardInstit
9、ute of Iron and Steel Wire Manufacturers Electricity Supply Industry in England and Institute of Sheet Metal Engineering Wales Amendments issued since publication Amd. No.DateComments 3379June 1980Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:49:49 G
10、MT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2898:1970 BSI 04-1999i Contents Page Co-operating organizationsInside front cover Forewordii 1 General requirements 1.1Scope1 1.2Definitions1 1.3Freedom from defects1 1.4Dimensions and tolerances1 1.5Selection of test samples2 1.6Mechanical tests2 1.7Elec
11、trical resistivity test3 1.8Retests3 1.9Certificate of compliance3 1.10Inspection3 1.11Independent test3 1.12Facilities for testing3 2 Specific requirements Material 1350 2.1General3 2.2Chemical composition limits5 2.3Condition4 2.4Mechanical Properties5 2.5Electrical Resistivity5 Material 6101A 2.1
12、General3 2.2Chemical composition limits5 2.3Condition4 2.4Mechanical Properties5 2.5Electrical Resistivity5 Appendix A Preferred sizes 15 Appendix B Standard values (for information only)15 Appendix C Details of the international alloy designations and chemical composition limits for wrought alumini
13、um alloys system15 Figure 1 Concavity or convexity2 Table 1 Tolerances on diameter, width and thickness of bars and regular sections6 Table 2 Tolerances on open ends of channels and I beams7 Table 3 Tolerances on angle for extruded sections9 Table 4 Normal radii for corners9 Table 5 Tolerances on wa
14、ll thickness of extruded round tube9 Table 6 Tolerances on outside and inside diameter of extruded round tube10 Table 7 Tolerances on width, width across flats and thickness of hollow sections11 Table 8 Cutting to length tolerances for bars, extruded round tube and sections12 Table 9 Straightness to
15、lerances for extruded bars, regular sections and extruded round tube13 Table 10 Twist tolerances for extruded solid and hollow sections14 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:49:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2898:1970 ii BSI 04-1999 Foreword In order to keep a
16、breast of progress in the industries concerned, British Standards are subject to periodical review. Suggestions for improvements will be recorded and in due course brought to the notice of the committees charged with the revision of the standards to which they refer. A complete list of British Stand
17、ards, numbering over 5000, fully indexed and with a note of the contents of each, will be found in the British Standards Yearbook. The BS Yearbook may be consulted in many public libraries and similar institutions. This standard makes reference to the following British Standards: BS 18, Methods for
18、the tensile testing of metals. BS 18-1, Non-ferrous metals. BS 1499, Sampling non-ferrous metals. BS 1728, Methods for the analysis of aluminium and aluminium alloys. BS 3239, Determination of resistivity of metallic electrical conductor materials. BS 3660, Glossary of terms used in the wrought alum
19、inium industry. This British Standard was first published in 1957 under the authority of the Non-Ferrous Metals Industry Standards Committee and at the request of the Aluminium Industry to cover aluminium material for busbar, switchgear components and other conductor applications. It previously refe
20、rred to solid bars and sections but has now been extended to cover also extruded round tube and hollow sections in electrical purity aluminium and an aluminium alloy, which are required for components made to other British Standards e.g. BS 159, “Busbars and busbar connections”. In this edition of t
21、he standard all dimensions are given in metric units and new tables of metric tolerances have been introduced which do not represent a “translation” of the previous imperial unit tolerances. Tables of preferred sizes for rectangular bar, extruded tube and round bar have also been included. The maxim
22、um resistivity values for the two conditions of pure aluminium have both been reduced to 2.8264 7 cm (61.0 % IACS) whilst that for the aluminium alloy remains at 3.133 7 cm (55.0 % IACS). The conditions previously covered have been retained but new designations have been introduced based on the syst
23、em under consideration by ISO/TC 79 “Light metals and their alloys”. The new designations bear the following relationship to the superseded designations. All stresses are quoted in terms of the hectobar (hbar)1). This standard is one of a series of standards for wrought aluminium and aluminium alloy
24、s for electrical purposes. New designationSuperseded designationDescription MMAs manufactured. Material which acquires some temper from shaping processes in which there is no special control over thermal treatment or amount of strain hardening. H21/4HStrain hardened. Material subjected to the applic
25、ation of cold work after annealing (or hot forming) or to a combination of cold work and partial annealing/stabilizing in order to secure the specified mechanical properties. TFWPSolution heat-treated and precipitation-treated material. 1) 1 hbar = 10 MN/m2= 10 N/mm2. Licensed Copy: sheffieldun shef
26、fieldun, na, Wed Nov 29 02:49:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2898:1970 BSI 04-1999iii As a major step towards alignment of aluminium and aluminium alloy compositions on an international basis, a substantial number of countries have agreed to adopt a 4-digit classification for alloy
27、 composition designation. This system is administered by the Aluminum Association Inc., who issue the “Registration Record of International Alloy Designations and Chemical Composition Limits for Wrought Aluminum Alloys”. By amendment, it has been decided to introduce this system into the British Sta
28、ndards concerned with these types of material in place of the material designations formerly used. The details of the system are given in Appendix C. The temper designations and associated mechanical property requirements remain unaltered for the present and therefore may not necessarily align preci
29、sely with those in the standards of other countries. Materials 1350 and 6101A therefore replace materials E1E and E91E respectively. Minor compositional changes have been made. Other standards in this series are: BS 2627, Wrought aluminium for electrical purposes. Wire. BS 2897, Wrought aluminium fo
30、r electrical purposes. Strip with drawn or rolled edges. BS 3988, Wrought aluminium for electrical purposes. Solid conductors for insulated cables. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct
31、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 cover, pages i to iv, pages 1 to 15 and a back cover. This standard has been updated (see copyright date) and may have ha
32、d amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:49:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:49:49 GMT+00:00 2006, Unco
33、ntrolled Copy, (c) BSI BS 2898:1970 BSI 04-19991 1 General requirements 1.1 Scope This British Standard specifies requirements for aluminium and aluminium alloy round and square bar not less than 10 mm in diameter or across flats rectangular bar of not less than 2.5 mm minor dimension, and extruded
34、round tubes and sections, for electrical conductors, and includes details of chemical composition, mechanical properties and electrical resistivity. Preferred sizes for rectangular bar, extruded tube and round bar are given in Appendix A. 1.2 Definitions For the purposes of this British Standard the
35、 following definitions apply: bar a round or square solid section supplied in straight lengths and of not less than 10 mm diameter or width across flats, or a rectangular solid section supplied in straight lengths and of not less than 2.5 mm minor dimension extruded round tube2) a circular hollow ex
36、trusion of uniform wall thickness not subjected to cold drawing hollow section2) an extruded shape other than round, the cross section of which completely encloses a void or voids, and which is not subjected to cold drawing regular section a solid drawn or extruded section, not otherwise covered by
37、the definition of bar, which can be conveniently divided into approximate rectangles with measurable dimensions, e.g. angles, channels, tees etc. The ratio of maximum to minimum thickness of such regular sections does not exceed 4 : 1 1.3 Freedom from defects The material shall be free from defects
38、prejudicial to its use as an electrical conductor. 1.4 Dimensions and tolerances 1.4.1 Tolerances on bar, regular sections, extruded round tube and hollow sections. The dimensional tolerances shall comply with the following tables: For purposes of tolerances, regular sections shall be divided into a
39、 series of equivalent rectangles, an angle, for example, being divided into two rectangles. For the purpose of determining tolerances on thickness and width, the widths of each such rectangle shall be the same as the major linear dimension of the angle, and the tolerance on thickness of each leg of
40、the angle shall be taken as if that leg were a rectangle of the same overall dimension. 1.4.2 Sections of complicated shape. Complicated sections shall be regarded as those sections which are not covered by Table 1, Table 2, Table 5, Table 6, Table 7. In such cases the tolerances shall be agreed bet
41、ween the supplier and the purchaser. The tolerances shall be based, as far as possible on those for regular sections and for extruded hollow sections. 1.4.3 Tolerance on concavity and convexity. A maximum tolerance on concavity and convexity of 0.05 mm per 10 mm shall apply over the width of the sec
42、tion (see Figure 1). 2) Extracted from BS 3660, “Glossary of terms used in the wrought aluminium industry”. Table 1Tolerances on diameter, width and thickness of bars and regular sections. Table 2Tolerances on open ends of channels and I beams. Table 3Tolerances on angle for extruded sections. Table
43、 4Normal radii for corners of square and rectangular bar and regular sections. Table 5Tolerances on wall thickness of extruded round tube. Table 6Tolerances on outside and inside diameter of extruded round tube. Table 7Tolerances on width, width across flats and thickness of hollow sections. Table 8
44、Cutting to length tolerances for bars, extruded round tube and sections. Table 9Straightness tolerances for extruded bars, regular sections and extruded round tube. Table 10 Twist tolerances for extruded solid and hollow sections. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:49:49 GMT+0
45、0:00 2006, Uncontrolled Copy, (c) BSI BS 2898:1970 2 BSI 04-1999 1.5 Selection of test samples Test samples for the tensile test and resistivity test specified in 1.6 and 1.7 shall be selected as follows. 1.5.1 Material of pure aluminium. Material of the same dimensions, produced in the same way, an
46、d of the same composition shall be grouped into batches as follows: One test sample shall be cut from a bar, tube or section selected from each batch. For bars, and for test samples representing bars up to and including 50 mm diameter or minor sectional dimension, the test piece shall be machined co
47、axially from the test sample. For bars over 50 mm diameter or minor sectional dimension, the longitudinal axis of the test piece shall be located at half the distance between the surface and the centre. Before the test samples are cut off, they shall be marked to identify them with the batch they re
48、present. The test samples shall be taken from the material as supplied, and shall not be further annealed or mechanically worked (except for straightening and machining the test piece) before being tested. 1.5.2 Material of heat-treatable aluminium alloys. Material of the same dimensions, produced i
49、n the same way and of the same composition, shall be grouped into batches of 2 000 kg, unless the heat-treatment batch is smaller in which event that shall constitute the batch. One test sample shall be cut from a bar or section selected from each batch. For bars, and for test samples representing bars up to and including 50 mm diameter or minor sectional dimension, the test piece shall be machined coaxially from the test sample. For bars over 50 mm diameter or minor sectional dimension, the longitudinal axis of the test piece shall be located at ha