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1、BRITISH STANDARD BS 2897:1970 Incorporating Amendment No. 1 Specification for Wrought aluminium for electrical purposes Strip with drawn or rolled edges Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:49:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2897:1970 This British Standard, havi
2、ng been approved by the Non-ferrous Metals Industry Standards Committee, was published under the authority of the Executive Board on 28 January 1970 BSI 11-1999 First published September 1957 First revision January 1970 The following BSI references relate to the work on this standard: Committee refe
3、rence NFE/24 Draft for comment 68/22310 ISBN 580 05565 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 departments and scientific and industrial org
4、anizations: 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 British Bronze and Brass Ingot ManufacturersIns
5、titution of Structural Engineers AssociationLead Development Association British Electrical and Allied ManufacturersLight Metal Founders Association Association*London Metal Exchange British Lead Manufacturers AssociationMagnesium Industry Council British Non-ferrous Metals FederationMinistry of Def
6、ence, Army Department British Non-Ferrous MetalsMinistry of Defence, Navy Department Federation High Conductivity CopperNational Brassfoundry Association GroupNon-ferrous Metal Stockists* British Non-ferrous Metals ResearchPost Office* AssociationRoyal Institute of British Architects Copper Developm
7、ent AssociationSociety of Motor Manufacturers and Traders Crown Agents for Oversea Governments andLtd. AdministrationsTin Research Institute Electric Cable Makers Confederation*Zinc Development Association Institute of British FoundrymenIndividual manufacturer Institute of Metals The Government depa
8、rtment 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 BoardInstitute of Iron and Steel Wire Electricity Supply Ind
9、ustry in England andManufacturers WalesInstitute of Sheet Metal Engineering Amendments issued since publication Amd. No.Date of issueComments 3378June 1980Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:49:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI
10、BS 2897:1970 BSI 11-1999i Contents Page Co-operating organizationsInside front cover Forewordii 1General requirements1 1.1Scope1 1.2Freedom from defects1 1.3Joints1 1.4Tolerances on dimensions1 1.5Corner radius1 1.6Selection of test samples1 1.7Tensile test1 1.8Elongation test1 1.9Bend test1 1.10 El
11、ectrical resistivity test1 1.11 Retests2 1.12 Certificate of compliance2 1.13 Inspection2 1.14 Independent test2 1.15 Facilities for testing2 Material 13503 2Specific requirements3 2.1General3 2.2Chemical composition3 2.3Condition3 2.4Mechanical properties3 2.5Electrical resistivity4 Appendix A Stan
12、dard values (for information only)5 Appendix B Details of the international alloy designations and chemical composition limits for wrought aluminium alloys system5 Table 1 Tolerances on width and thickness4 Table 2 Radius on corners4 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:49:53 GM
13、T+00:00 2006, Uncontrolled Copy, (c) BSI BS 2897:1970 ii BSI 11-1999 Foreword This standard makes reference to the following British Standards: BS 18, Methods for the tensile testing of metals. BS 18-1, Non-ferrous metals. BS 1499, Sampling non-ferrous metals. BS 1728, Methods for the analysis of al
14、uminium and aluminium alloys. BS 3239, Determination of resistivity of metallic electrical conductor materials. 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 in view of the inc
15、reasing 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 for general electrical comp
16、onents 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 the system under considerati
17、on 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 alloys for electrical pur
18、poses. Other standards in this series are: BS 2627, Wrought aluminium for electrical purposes. Wire. BS 2898, Wrought aluminium and aluminium alloys for electrical purposes. Bars, extruded round tube and sections. BS 3988, Wrought aluminium for electrical purposes. Solid conductors for insulated cab
19、les. 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 composition designation. This system is administered by the Aluminum Association Inc., who issue t
20、he “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 Standards concerned with these types of material in place of the material designations formerly used.
21、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. Material 1350 therefore replaces material D1E.
22、 Minor compositional changes have been made. New designationSuperseded designation OO H4“H H8H 1) 1 hbar = 10 MN/m2= 10 N/mm2. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:49:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2897:1970 BSI 11-1999iii A British Standard does not purport to
23、 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 itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover,
24、pages i to iv, pages 1 to 5 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:49:53 GMT+00:00 2006, Uncontr
25、olled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:49:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2897:1970 BSI 11-19991 1 General requirements 1.1 Scope This British Standard specifies requirements for aluminium strip with drawn or rolled edges for electrica
26、l purposes, 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 to 6. Strip with greater width/thickn
27、ess ratios may be supplied by arrangement. Sizes greater than 20 mm 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 mad
28、e in the 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.
29、1.6 Selection of test samples Test samples for the tensile, elongation, bend and resistivity tests specified in 1.7, 1.8, 1.9 and 1.10 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 weigh
30、ts given below, 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
31、shall not 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 BS 18-12). The load shall be applied gradually and uniformly. 1.8 Elongation test The test shall be made in accordance with BS 18-12). The
32、load shall be applied gradually and uniformly. Where possible the test piece shall be of the full cross section of the material with a gauge length of 50 mm. Alternatively it shall be of the full thickness of the material and machined to conform to the dimensions of the rectangular section test piec
33、e having a gauge length of 50 mm given in BS 18-12). 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 reac
34、hed, the determination 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 material 2.6 mm and thinner the bend test piece shall be of the full cross section, and of convenient length. It shall be bent
35、 around a former of the appropriate diameter (or closed flat) as specified in 2.4.2. 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 stri
36、p in accordance with the routine method given in BS 32393). ThicknessWeight of batch mm 0.6 up to and including 1.5 Over 1.5 kg 500 1 000 2) BS 18, “Methods for the tensile testing of metals”, Part 1, “Non-ferrous metals”. 3) BS 3239, “Determination of resistivity of metallic electrical conductor ma
37、terials”. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:49:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2897:1970 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, o
38、ne of which shall be from the strip from which the original test sample was taken, unless that strip has been withdrawn by the 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
39、 and electrical resistivity tests, the batch represented by these samples shall be deemed to comply with the standard. Should the 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,
40、 if required, certify that the material complies with the requirements of this standard. 1.13 Inspection If the purchaser wishes 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 com
41、pliance of the material with regard to the composition or test requirements of this standard, the purchaser and the supplier shall 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 th
42、e material does not comply with the standard, the cost of independent testing shall be borne by the supplier; if the material complies with the standard the cost shall be borne by the purchaser. The method of sampling for analysis shall be in accordance with BS 14994); the methods of analysis shall
43、be in accordance with BS 17285), where the appropriate method exists, and the method for determining resistivity shall be in accordance with the reference method in BS 32396). 1.15 Facilities for testing The supplier shall make the necessary arrangements for carrying out the tests required by this s
44、tandard. 4) BS 1499, “Sampling non-ferrous metals”. 5) BS 1728, “Methods for the analysis of aluminium and aluminium alloys”. 6) BS 3239, “Determination of resistivity of metallic electrical conductor materials”. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:49:53 GMT+00:00 2006, Uncontr
45、olled Copy, (c) BSI BS 2897:1970 BSI 11-19993 Material 1350 (former BS designation D1E) 2 Specific requirements 2.1 General The material shall comply with the general requirements of Section 1 and shall have the following chemical composition, condition and mechanical and electrical properties. 2.2
46、Chemical composition limits7)8) The chemical composition of material 1350 shall be as follows: 2.3 Condition The material shall be supplied in one of the conditions shown in 2.4.1 as specified by the purchaser, and shall comply with the mechanical and electrical properties stipulated in 2.4 and 2.5.
47、 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 purchaser. 2.4 Mechanical properties 2.4.1 Tensile test. The mechan
48、ical properties, obtained from test pieces selected as specified in 1.6, and prepared and tested as specified in 1.7 and 1.8 shall be as follows: The elongation measurement shall apply only to material thicker than 2.6 mm. 2.4.2 Bend test. (for material 2.6 mm and thinner). The bend test shall be ma
49、de on a test piece, selected and prepared as specified in 1.6 and 1.9, which shall not crack when bent through 180 round a former having the appropriate radius specified below. 7) Composition in per cent maximum unless shown as a range or a minimum. 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 beyond the last figure or