1、BRITISH STANDARD BS4637:1970 Incorporating Amendment Nos.1,2 and3 Specification for Carbon steel wire for coiled springs (Bedding and seating)BS4637:1970 This British Standard, having been approved by the Iron and Steel Industry Standards Committee, was published underthe authority of the Executive
2、Board on 23 October1970 BSI06-1999 The following BSI references relate to the work on this standard: Committee references ISM/26 Draft for comment69/1395 ISBN 580 06064 0 Co-operating organizations The Iron and Steel Industry Standards Committee, under whose supervision this British Standard was pre
3、pared, consists of representatives from the following Government departments and scientific and industrial organizations: Board of Trade Institution of Production Engineers British Cast Iron Research Association Institution of Structural Engineers British Constructional Steelwork Association Joint I
4、ron Council British Electrical and Allied Manufacturers Lloyds Register of Shipping Association Ministry of Defence British Ironfounders Association Ministry of Defence, Army Department British Mechanical Engineering Confederation Ministry of Defence, Navy Department British Railways Board National
5、Association of Drop Forgers and British Steel Industry* Stampers Council of Ironfoundry Associations National Physical Laboratory (Ministry of Council of Iron Producers Technology) Crown Agents for Oversea Governments and Oil Companies Materials Association Administrations Royal Institute of British
6、 Architects Department of Employment and Productivity Shipbuilders and Repairers National (H.M. Factory Inspectorate) Federation Engineering Equipment Users Association* Society of British Aerospace Companies Ltd. Federation of Civil Engineering Contractors Society of Motor Manufacturers and Institu
7、te of British Foundrymen Traders Ltd.* Institute of Iron and Steel Wire Manufacturers* Stainless Steel Development Association Institute of Marine Engineers Steel Castings Research and Trade Association Institution of Civil Engineers Tank and Industrial Plant Association Institution of Mechanical En
8、gineers Tin Research Institute (Automobile Division) Water-tube Boiler Makers Association 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 prepar
9、ation of this British Standard: Alloy and Stainless Steel Conference Fencing Contractors Association British Bolt, Nut, Screw and Rivet Federation Institution of Engineering Inspection British Wire Netting Association Spring Research Association Amendments issued since publication Amd. No. Date Comm
10、ents 878 February1972 6155 May1990 7609 June1993 Indicated by a sideline in the marginBS4637:1970 BSI 06-1999 i Contents Page Co-operating organizations Inside front cover Foreword ii 1 Scope 1 2 Information to be supplied by the purchaser 1 3 Steelmaking process 1 4 Chemical composition 1 5 Standar
11、d sizes and diameter tolerances 1 6 Finished wire 1 7 Selection of test pieces 2 8 Methods of testing 2 9 Mechanical properties 2 10 Retests 2 11 Packing and identification 2 Appendix A Practical equivalents of metric values 3 Table 1 Chemical composition 1 Table 2 Standard sizes, Tolerances and ova
12、lity 1 Table 3 Tensile strength ranges 2 British Standards 4BS4637:1970 ii BSI 06-1999 Foreword In order to keep abreast 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
13、of the committees charged with the revision of the standards to which they refer. A complete list of British Standards, numbering over5000, fully indexed and with a note of the contents of each, will be found in the British Standards Yearbook, price 1. The BS Yearbook may be consulted in many public
14、 libraries and similar institutions. This standard makes reference to the following British Standards: BS443, Galvanized coatings on wire. BS4545, Methods for mechanical testing of steel wire. BS6200, Sampling and analysis of iron, steel and other ferrous metals. BS6562, Terms used in the iron and s
15、teel industry. BS6562-1, Glossary of heat treatment terms. This British Standard is authorized by the Iron and Steel Industry Standards Committee. The wire diameters specified are taken from the preferred series of metric sizes in order to provide reasonable equivalence with present inch sizes which
16、 are in common usage. The tensile strengths specified in this standard are in line with industrial practice within the United Kingdom. NOTEAttention is drawn to certification facilities offered by BSI; see the back cover of this standard. A British Standard does not purport to include all the necess
17、ary 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, pagesi andii, pages1to4
18、 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 theinside front cover.BS4637:1970 BSI 06-1999 1 1 Scope 1.1 This British Standard specifies the requirements for patented cold drawn plain
19、 carbon steel round wire, suitable for the manufacture of tension or compression coil and helical springs used in the production of spring centre units for beds and seats. Wire to this standard is not intended for use in the manufacture of mechanical springs. The definition of patenting is given in
20、BS6562-1. 1.2 The standard lists specific metric sizes of wire and gives a choice of tensile strength ranges. 2 Information to be supplied by the purchaser For ordering purposes, the wire shall be designated by: 1) the number of this British Standard, i.e.BS4637; 2) the nominal diameter; 3) the tens
21、ile strength range. Example: 1.6mm bedding and seating wire of tensile strength1550/1750N/mm 2shall be ordered as “BS4637,1.6mm,1550/1750N/mm 2 ”. Any requirements for surface coating shall be clearly stated on the order. 3 Steelmaking process The steel may be made by any process except that the air
22、, and mixed air-oxygen, bottom blown basic converter process shall not be used. 4 Chemical composition The cast analysis of the steel shall be within the limits specified in Table 1. Table 1 Chemical composition 5 Standard sizes and diameter tolerances 5.1 The standard wire sizes are given in Table
23、2. 5.2 The diameter tolerance and the ovality of the wire shall not exceed the limits given in Table 2. The ovality shall be measured as the difference between the maximum and minimum dimension at any one cross section. Table 2 Standard sizes, tolerances and ovality 6 Finished wire 6.1 Freedom from
24、defects. The finished wire shall be free from harmful surface defects, pipe and segregation. 6.2 Condition. The wire shall be supplied in a smooth, bright drawn condition, unless otherwise specified. The wire may be supplied with a galvanized or other coating, when so specified by the purchaser on h
25、is order. The coating requirements shall be the subject of an agreement between the manufacturer and the purchaser. (See8.2.) Wire supplied in coil form shall lie dead and shall be free from any cork-screw set. Element Percentage Min. Max. Carbon 0.35 0.80 Silicon 0.35 Manganese 0.40 1.00 Sulphur 0.
26、050 Phosphorus 0.050 Standardsize (nominaldiameter) Toleranceon diameter Maximum ovality mm mm mm 1.18 0.02 0.02 1.25 0.02 0.02 1.32 0.02 0.02 1.40 0.02 0.02 1.50 0.02 0.02 1.60 0.02 0.02 1.70 0.02 0.02 1.80 0.02 0.02 1.85 0.02 0.02 1.90 0.02 0.02 2.00 0.03 0.03 2.12 0.03 0.03 2.24 0.03 0.03 2.36 0.
27、03 0.03 2.50 0.03 0.03 2.65 0.03 0.03 2.80 0.03 0.03 3.00 0.03 0.03 3.15 0.03 0.03 3.35 0.03 0.03 3.55 0.03 0.03BS4637:1970 2 BSI 06-1999 7 Selection of test pieces Lengths of wire for all the specified tests shall be taken from both ends of each coil of wire. 8 Methods of testing 8.1 The methods of
28、 carrying out the mechanical tests specified in Clause9 shall be in accordance with BS4545 1) . In routine testing with fixed gear type tensile testing machines, the straining rate shall be preset to give a rate of separation of the grips not greater than40% of the test length per minute. 8.2 The me
29、thods of carrying out any specified tests on a galvanized coating shall be in accordance with BS443 2) . The methods of testing a coating of another type, where this is specified on the order, shall be the subject of an agreement between the manufacturer and the purchaser. 8.3 In case of dispute, wh
30、en a check analysis is required on the wire, the method of test shall be in accordance with the appropriate method in Handbook No19 3)account being taken of the heterogeneity normal to the steel. 9 Mechanical properties 9.1 Tensile test. When tested in accordance with8.1, the tensile strength, calcu
31、lated on the nominal diameter of the wire, shall be in accordance with the appropriate tensile strength range given in Table 3. Table 3 Tensile strength ranges 9.2 Wrapping test. When tested in accordance with8.1, the wire shall be capable of being wrapped at least two turns around its own diameter,
32、 without fracture. 10 Retests 10.1 Should any test piece fail any of the tests, part of the coil may be discarded and the coil retested in accordance with this standard. 10.2 If both of the additional test pieces pass the tests, the coil shall be deemed to comply with the requirements of this standa
33、rd. If either of the additional test pieces fail any one of the tests, the coil shall be deemed not to comply with the requirements of this standard. 11 Packing and identification The wire shall be securely tied and shall carry a suitable label or labels on which shall be shown the information indic
34、ated in Clause2. Any other markings shall be agreed between the purchaser and the manufacturer. 1) BS4545, “Methods for mechanical testing of steel wire”. 2) BS443, “Galvanized coatings on wire”. 3) BS Handbook No19, “Methods for the sampling and analysis of iron, steel, and other ferrous metals”. T
35、ensile strength ranges N/mm 2 1400/1600 1500/1700 1550/1750 1600/1800 1700/1900 1850/2050BS4637:1970 BSI 06-1999 3 Appendix A Practical equivalents of metric values Wire diameters mm in mm in 1.18 0.047 2.12 0.084 1.25 0.049 2.24 0.088 1.32 0.052 2.36 0.093 1.40 0.055 2.50 0.098 1.50 0.059 2.65 0.10
36、4 1.60 0.063 2.80 0.110 1.70 0.067 3.00 0.118 1.80 0.071 3.15 0.124 1.90 0.075 3.35 0.132 2.00 0.079 3.55 0.140 Tolerances on diameter mm in 0.02 0.0008 0.03 0.0012 Tensile strengths N/mm 2 kgf/mm 2 tonf/in 2 1400/1600 143/163 91/104 1500/1700 153/173 97/110 1550/1750 158/178 100/113 1600/1800 163/1
37、83 104/117 1700/1900 173/194 110/123 1850/2050 189/209 120/133BS4637:1970 4 BSI 06-1999 British Standards The following are available on application: YEARBOOK Including subject index and numerical list of British Standards1. SECTIONAL LIST. Gratis Acoustics (SL10) Aerospace materials and components
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