1、BRITISH STANDARD BS2897:1970 Incorporating Amendment No.1 Specification for Wrought aluminium for electrical purposes Strip with drawn or rolled edgesBS2897:1970 This British Standard, having been approved by the Non-ferrous Metals IndustryStandards Committee, was published underthe authorityof the
2、Executive Boardon 28January1970 BSI 11-1999 First published September1957 First revision January1970 The following BSI references relate to the work on this standard: Committee reference NFE/24 Draft for comment68/22310 ISBN 580 05565 5 Co-operating organizations The Non-ferrous Metals Industry Stan
3、dards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: Aluminium Federation* Institution of Mechanical Engineers Association of Bronze and Brass Founders (Automobi
4、le Division) Association of Consulting Engineers Institution of Mining and Metallurgy Board of Trade Institution of Production Engineers British Bronze and Brass Ingot Manufacturers Institution of Structural Engineers Association Lead Development Association British Electrical and Allied Manufacture
5、rs Light Metal Founders Association Association* London Metal Exchange British Lead Manufacturers Association Magnesium Industry Council British Non-ferrous Metals Federation Ministry of Defence, Army Department British Non-Ferrous Metals Ministry of Defence, Navy Department FederationHigh Conductiv
6、ity Copper National Brassfoundry Association Group Non-ferrous Metal Stockists* British Non-ferrous Metals Research Post Office* Association Royal Institute of British Architects Copper Development Association Society of Motor Manufacturers and Traders Crown Agents for Oversea Governments and Ltd. A
7、dministrations Tin Research Institute Electric Cable Makers Confederation* Zinc Development Association Institute of British Foundrymen Individual manufacturer Institute of Metals The Government department and scientific and industrial organizations marked with an asterisk in the above list, togethe
8、r with the following, were directly represented on the committee entrusted with the preparation of this British Standard: British Railways Board Institute of Iron and Steel Wire Electricity Supply Industry in England and Manufacturers Wales Institute of Sheet Metal Engineering Amendments issued sinc
9、e publication Amd. No. Date of issue Comments 3378 June 1980 Indicated by a sideline in the marginBS2897:1970 BSI 11-1999 i Contents Page Co-operating organizations Inside front cover Foreword ii 1 General requirements 1 1.1 Scope 1 1.2 Freedom from defects 1 1.3 Joints 1 1.4 Tolerances on dimension
10、s 1 1.5 Corner radius 1 1.6 Selection of test samples 1 1.7 Tensile test 1 1.8 Elongation test 1 1.9 Bend test 1 1.10 Electrical resistivity test 1 1.11 Retests 2 1.12 Certificate of compliance 2 1.13 Inspection 2 1.14 Independent test 2 1.15 Facilities for testing 2 Material1350 3 2 Specific requir
11、ements 3 2.1 General 3 2.2 Chemical composition 3 2.3 Condition 3 2.4 Mechanical properties 3 2.5 Electrical resistivity 4 Appendix A Standard values (for information only) 5 Appendix B Details of the international alloy designations and chemicalcomposition limits for wrought aluminium alloys system
12、 5 Table 1 Tolerances on width and thickness 4 Table 2 Radius on corners 4BS2897:1970 ii BSI 11-1999 Foreword This standard makes reference to the following British Standards: BS18, Methods for the tensile testing of metals. BS18-1, Non-ferrous metals. BS1499, Sampling non-ferrous metals. BS1728, Me
13、thods for the analysis of aluminium and aluminium alloys. BS3239, Determination of resistivity of metallic electrical conductor materials. This British Standard was first published in1957 under the authority of the Non-ferrous Metals Industry Standards Committee and at the request of the Aluminium I
14、ndustry in view of the increasing use of aluminium for electrical conductors of many types. It refers to strip used for electrical conductors such as windings for rotating electrical machines or transformers, and is suitable for controlling the quality of electrical purity aluminium strip supplied f
15、or general electrical components made to other relevant British Standards. In this edition all dimensions are shown in metric units which are not exact equivalents of the original values. The three conditions previously covered have been retained but new designations have been introduced based on th
16、e system under consideration by ISO/TC79“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
17、 alloys for electrical purposes. Other standards in this series are: BS2627, Wrought aluminium for electrical purposes. Wire. BS2898, Wrought aluminium and aluminium alloys for electrical purposes. Bars, extruded round tube and sections. BS3988, Wrought aluminium for electrical purposes. Solid condu
18、ctors for insulated cables. 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 a4-digit classification for alloy composition designation. This system is administered by the Aluminum Associa
19、tion 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 BritishStandards concerned with these types of material in place of the material designa
20、tions formerly used. The details of the system are given in Appendix B. The temper designations and associated mechanical property requirements remain unaltered for the present and therefore may not necessarily align precisely with those in the standards of other countries. Material1350 therefore re
21、places material D1E. Minor compositional changes have been made. New designation Superseded designation O O H4 “H H8 H 1) 1hbar=10MN/m 2 =10N/mm 2 .BS2897:1970 BSI 11-1999 iii A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are re
22、sponsible for their correct 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, pagesi to iv, pages1to5 and a back cover. This standard has been updated (see copyrigh
23、t date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.iv blankBS2897:1970 BSI 11-1999 1 1 General requirements 1.1 Scope This British Standard specifies requirements for aluminium strip with drawn or rolled edges for electrical purp
24、oses, including chemical composition, mechanical properties, and electrical resistivity. It is applicable mainly to material of square or rectangular cross section with radiused corners. Such a material is normally available with a width/thickness ratio up to6. Strip with greater width/thickness rat
25、ios may be supplied by arrangement. Sizes greater than20mm in width may not be available in the H8 condition. 1.2 Freedom from defects The material shall be free from defects prejudicial to its use as an electrical conductor. 1.3 Joints There shall be no joints in the strip except those made in the
26、base rod or strip before final drawing or rolling. 1.4 Tolerances on dimensions Tolerances on width and thickness of strip shall be in accordance with Table 1. 1.5 Corner radius Unless otherwise specified by the purchaser, the corner radius of the strip shall be in accordance with Table 2. 1.6 Selec
27、tion of test samples Test samples for the tensile, elongation, bend and resistivity tests specified in 1.7, 1.8, 1.9 and1.10 shall be selected as follows. Strip of the same thickness, produced in the same way, and of the same condition, shall be grouped into batches not exceeding the weights given b
28、elow, and one test sample shall be cut from the strip selected from each batch, or any part of a batch remaining, to provide the necessary test pieces. Before the test samples are cut off they shall be marked to identify them. The test samples shall be taken from the strip as supplied and shall not
29、be annealed or mechanically worked other than by straightening or machining before testing. 1.7 Tensile test The test shall be made in accordance with BS18-1 2) . The load shall be applied gradually and uniformly. 1.8 Elongation test The test shall be made in accordance with BS18-1 2) . The load sha
30、ll be applied gradually and uniformly. Where possible the test piece shall be of the full cross section of the material with a gauge length of50mm. Alternatively it shall be of the full thickness of the material and machined to conform to the dimensions of the rectangular section test piece having a
31、 gauge length of50mm given in BS18-1 2) . The elongation shall be measured on the gauge length after the fractured ends have been fitted together. The determination shall be valid, whatever the position of the fracture, if the specified value is reached. If the specified value is not reached, the de
32、termination shall be valid only if the fracture occurs between the gauge marks and not closer than one third of the gauge length to either mark. 1.9 Bend test For material2.6mm and thinner the bend test piece shall be of the full cross section, and of convenient length. It shall be bent around a for
33、mer of the appropriate diameter (or closed flat) as specified in2.4.2. When the use of a former is impracticable, the test piece may be bent by hand to a U form, and closed in a vice. 1.10 Electrical resistivity test The resistivity shall be determined by direct measurement on the strip in accordanc
34、e with the routine method given in BS3239 3) . Thickness Weight of batch mm 0.6 up to and including1.5 Over1.5 kg 500 1000 2) BS18, “Methods for the tensile testing of metals”, Part1, “Non-ferrous metals”. 3) BS3239, “Determination of resistivity of metallic electrical conductor materials”.BS2897:19
35、70 2 BSI 11-1999 1.11 Retests Should any test piece fail to pass the mechanical or electrical resistivity tests, two further samples from the same batch shall be selected, one of which shall be from the strip from which the original test sample was taken, unless that strip has been withdrawn by the
36、supplier. Test pieces for the retests shall be cut from these further samples. Should the test pieces from the two further samples satisfy the requirements of the mechanical and electrical resistivity tests, the batch represented by these samples shall be deemed to comply with the standard. Should t
37、he test pieces from either of the two samples fail, the batch represented shall be deemed not to comply with the standard. 1.12 Certificate of compliance The supplier shall, if required, certify that the material complies with the requirements of this standard. 1.13 Inspection If the purchaser wishe
38、s to inspect the material at the suppliers works he shall notify the supplier at the time of placing the order. 1.14 Independent test Should there be a dispute about the compliance of the material with regard to the composition or test requirements of this standard, the purchaser and the supplier sh
39、all have the right to have tests made by a mutually acceptable testing authority. The results obtained by the independent testing authority shall be accepted as final. If the material does not comply with the standard, the cost of independent testing shall be borne by the supplier; if the material c
40、omplies with the standard the cost shall be borne by the purchaser. The method of sampling for analysis shall be in accordance with BS1499 4) ; the methods of analysis shall be in accordance with BS1728 5) , where the appropriate method exists, and the method for determining resistivity shall be in
41、accordance with the reference method in BS3239 6) . 1.15 Facilities for testing The supplier shall make the necessary arrangements for carrying out the tests required by this standard. 4) BS1499, “Sampling non-ferrous metals”. 5) BS1728, “Methods for the analysis of aluminium and aluminium alloys”.
42、6) BS3239, “Determination of resistivity of metallic electrical conductor materials”.BS2897:1970 BSI 11-1999 3 Material 1350 (former BS designationD1E) 2 Specific requirements 2.1 General The material shall comply with the general requirements of Section1 and shall have the following chemical compos
43、ition, condition and mechanical and electrical properties. 2.2 Chemical composition limits 7)8) The chemical composition of material1350 shall be as follows: 2.3 Condition The material shall be supplied in one of the conditions shown in2.4.1 as specified by the purchaser, and shall comply with the m
44、echanical and electrical properties stipulated in2.4 and2.5. Where material is required in a condition suitable for severe edgewise bending the degree and method of bending shall be stated in the enquiry and/or order, and any special test requirements shall be agreed between the supplier and purchas
45、er. 2.4 Mechanical properties 2.4.1 Tensile test. The mechanical properties, obtained from test pieces selected as specified in1.6, and prepared and tested as specified in1.7 and1.8 shall be as follows: The elongation measurement shall apply only to material thicker than2.6mm. 2.4.2 Bend test. (for
46、material2.6mm and thinner). The bend test shall be made on a test piece, selected and prepared as specified in1.6 and1.9, which shall not crack when bent through180 round a former having the appropriate radius specified below. 7) Composition in per cent maximum unless shown as a range or a minimum.
47、8) For the purposes of determining conformance to these limits, an observed value or a calculated value obtained from analysis is rounded off to the nearest unit in the last right-hand place of figures used in expressing the specified limit, in accordance with the following. When the figure next bey
48、ond the last figure or place to be retained is less than5, the figure in the last place retained should be kept unchanged. When the figure next beyond the last figure or place to be retained is greater than5, the figure in the last place retained should be increased by1. When the figure next beyond
49、the last figure or place to be retained is5 and a) there are no figures, or only zeros, beyond this5, if the figure in the last place to be retained is odd, it should be increased by1; if even, it should be kept unchanged; b) if the5 next beyond the figure in the last place to be retained is followed by any figures other than zero, the figure in the last place retained should be increased by1, whether odd or even. Silicon 0.10 Iron 0.40 Copper 0.05 Manganese 0.01 Chromium 0.01 Zinc 0.05 Gallium 0.03 Boron 0.05 Vanadium+Titanium 0.02 Others a Each 0.03 Total 0.10 Alumi
