1、BRITISH STANDARD BS4638:1970 Incorporating Amendment Nos.1 and2 Specification for Carbon steel wire for zigzag and square-form springsBS4638:1970 This British Standard, having been approved by theIron andSteel Industry Standards Committee, was published underthe authority ofthe Executive Board on 22
2、October1970 BSI 07-1999 The following BSI references relate to the work on this standard: Committee references ISM/26 Draft for comment69/1396 ISBN 580 06074 8 Co-operating organizations The Iron and Steel Industry Standards Committee, under whose supervision this British Standard was prepared, cons
3、ists of representatives from the following Government departments and scientific and industrial organizations: 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 entr
4、usted with the preparation of this British Standard: Board of Trade Institution of Production Engineers British Cast Iron Research Association Institution of Structural Engineers British Constructional Steelwork Association Joint Iron Council British Electrical and Allied Manufacturers Lloyds Regist
5、er of Shipping Association Ministry of Defence British Ironfounders Association Ministry of Defence, Army Department* British Mechanical Engineering Ministry of Defence, Navy Department Confederation National Association of Drop Forgers and British Railways Board Stampers British Steel Industry* Nat
6、ional Physical Laboratory Council of Ironfoundry Associations (Ministry of Technology) Council of Iron Producers Oil Companies Materials Association Crown Agents for Oversea Governments and Royal Institute of British Architects Administrations Shipbuilders and Repairers National Department of Employ
7、ment and Productivity Federation (H.M. Factory Inspectorate) Society of British Aerospace Companies Ltd. Engineering Equipment Users Association* Society of Motor Manufacturers and Federation of Civil Engineering Contractors Traders Ltd.* Institute of British Foundrymen Stainless Steel Development A
8、ssociation Institute of Iron and Steel Wire Steel Castings Research and Trade Association Manufacturers* Tank and Industrial Plant Association Institute of Marine Engineers Tin Research Institute Institution of Civil Engineers Water-tube Boiler Makers Association Institution of Mechanical Engineers
9、(Automobile Division) Alloy and Stainless Steel Conference Institution of Engineering Inspection British Bolt, Nut, Screw and Rivet Federation Music Wire Export Association British Wire Netting Association Patented Steel Wire Association British Wire Rod Rollers Association Society of Chain Link Fen
10、cing Manufacturers Fencing Contractors Association Spring Research Association Furnishing Springmakers Federation Amendments issued since publication Amd. No. Date of issue Comments 6156 May 1990 7610 June 1993 Indicated by a sideline in the marginBS4638:1970 BSI 07-1999 i Contents Page Co-operating
11、 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 Standard sizes and diameter tolerances 1 6 Finished wire 2 7 Selection of test pieces 2 8 Methods of testing 2 9 Mechanical properties 2 10 Retes
12、ts 2 11 Packing and identification 2 Appendix A Practical equivalents of metric values 4 Table 1 Chemical composition 1 Table 2 Diameter tolerance and ovality 1 Table 3 Standard sizes and tensile strengths for wire for zigzag springs 1 Table 4 Standard sizes and tensile strengths for wire for square
13、-form springs 2 Table 5 Minimum number of torsions 3BS4638:1970 ii BSI 07-1999 Foreword This standard makes reference to the following British Standards: BS 443, Galvanized coatings on wire. BS 1121, Methods for the analysis of iron and steel. BS 4545, Methods for mechanical testing of steel wire. B
14、S 6562, Terms used in the iron and steel industry Part 1: Glossary of heat treatment terms. This British Standard is authorized by the Iron and Steel Industry Standards Committee, and specifies three grades of zigzag spring wire, in which the tensile strength is varied according to size of wire. Thi
15、s has been done in order that an appropriate choice may be made to meet not only the present U.K. practice, but also the general requirements of both European countries and the North American continent. Similarly, the two grades of square-form spring wire enable appropriate tensile strength ranges t
16、o be chosen to meet the present U.K. practice and the majority of usage in the North American continent. 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 Stan
17、dard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated
18、. This will be indicated in the amendment table on the inside front cover.BS4638:1970 BSI 07-1999 1 1 Scope 1.1 This British Standard specifies the requirements for patented cold drawn plain carbon steel round wire, suitable for forming into zigzag and square-form springs used in the production of s
19、eat and back units for cars and certain types of domestic upholstery. Wire to this standard is not intended for use in the manufacture of mechanical springs. The definition of patenting is given in BS6562-1. 1.2 The standard includes preferred metric sizes of wire for the two types of spring and giv
20、es 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.BS4638; 2) the type of wire, i.e.“zigzag” or “square-form”; 3) the nominal diameter; 4) the tensile strength grade
21、. Example: 3.65 mm wire for zigzag springs in a tensile strength of1550/1720 N/mm 2shall be ordered as “BS4638, zigzag,3.65 mm, grade2”. Any requirements for surface coating shall be clearly stated on the order. 3 Steelmaking process The steel be made by any process except that the air, and mixed ai
22、r-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 for zigzag spring wire are given
23、in Table 3 and for square-form spring wire in Table 4. 5.2 The diameter tolerance and ovality for both types of 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 Diameter tole
24、rance and ovality Table 3 Standard sizes and tensile strengths for wire for zigzag springs Element Percentage Min. Max. Carbon Silicon Manganese Sulphur Phosphorous 0.45 0.40 0.85 0.35 1.00 0.050 0.050 Nominal diameter Tolerance on diameter Maximum ovality Over Up to and including mm 1.90 4.12 mm 4.
25、12 4.87 mm 0.03 0.04 mm 0.03 0.04 Standard size (nominal diameter) Tensile strength Grade1 Grade2 Grade3 mm 2.00 2.12 2.24 2.36 2.50 2.65 2.80 3.00 3.07 3.15 3.25 3.35 3.45 3.55 3.65 3.75 4.00 4.12 4.25 4.50 4.75 4.87 N/mm 2 1600/1770 1600/1770 1600/1770 1600/1770 1550/1720 1550/1720 1550/1720 1500/
26、1670 1500/1670 1500/1670 1500/1670 1500/1670 1450/1620 1450/1620 1450/1620 1400/1570 1400/1570 1400/1570 1400/1570 1400/1570 1400/1570 1400/1570 N/mm 2 1650/1820 1650/1820 1650/1820 1650/1820 1600/1770 1600/1770 1600/1770 1600/1770 1600/1770 1600/1770 1550/1720 1550/1720 1550/1720 1550/1720 1550/172
27、0 1550/1720 1550/1720 1500/1670 1500/1670 1450/1620 1450/1620 1450/1620 N/mm 2 1700/1870 1700/1870 1700/1870 1700/1870 1700/1870 1700/1870 1700/1870 1700/1870 1700/1870 1700/1870 1700/1870 1700/1870 1650/1820 1650/1820 1600/1770 1600/1770 1600/1770 1600/1770 1550/1720 1500/1670 1500/1670 1500/1670 N
28、OTEPreferred sizes are shown in bold type.BS4638:1970 2 BSI 07-1999 Table 4 Standard sizes and tensile strengths for wire for square-form springs 6 Finished wire 6.1 Freedom from defects. The finished wire shall be free from harmful surface defects, pipe and segregation. 6.2 Condition. The wire shal
29、l 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 his order. The coating requirements shall be the subject of an agreement between the manufacturer and the purchaser. (See8
30、.2.) Wire supplied in coil form shall lie dead and shall be free from any corkscrew set. 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 carrying out the mechanical tests specified in C
31、lause9 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 methods of carrying out any specified tests on a gal
32、vanized 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, when a check analysis is required on the wire, the method of
33、 test shall be in accordance with the appropriate Part of BS1121 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, calculated on the nominal diameter of the wire, shall be in accordanc
34、e with the appropriate tensile strength range given in Table 3or Table 4. For non-standard sizes, the tensile strength range shall be that specified for the next larger standard size. 9.2 Torsion test 9.2.1 When tested in accordance with8.1, with a free length between grips of100 wire diameters(100d
35、), the minimum number of torsions before fracture shall be in accordance with Table 5. 9.2.2 The primary fracture shall be perpendicular to the axis of the wire and the surface shall not be split. The condition of any secondary fracture shall be ignored. 10 Retests 10.1 Should any test piece fail an
36、y 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 standard. If either of the additional test pieces fail any one of the
37、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 indicated in Clause2. Any other markings shall be agreed between the
38、purchaser and the manufacturer. Standard size (nominal diameter) Tensile strength Grade1 Grade2 mm 2.30 2.65 3.07 3.25 3.45 3.75 4.00 4.12 N/mm 2 1550/1720 1500/1670 1500/1670 1500/1670 1450/1620 1350/1520 1350/1520 1350/1520 N/mm 2 1600/1770 1550/1720 1550/1720 1550/1720 1500/1670 1400/1570 1400/15
39、70 1400/1570 1) BS4545, “Methods for mechanical testing of steel wire”. 2) BS443, “Galvanized coatings on wire”. 3) BS1121, “Methods for the analysis of iron and steel”.BS4638:1970 BSI 07-1999 3 Table 5 Minimum number of torsions Standard size (nominal diameter) Zigzag spring wire Square-form spring
40、 wire Over Up to and including Grade1 Grade2 Grade3 Grades1 &2 Minimum number of torsions in100d mm 1.90 3.00 4.12 mm 3.00 4.12 4.87 20 20 15 20 15 15 15 15 15 20 20 BS4638:1970 4 BSI 07-1999 Appendix A Practical equivalents of metric values Wire diameters mm in mm in mm in 2.0 2.12 2.24 2.3 2.36 2.
41、5 2.65 2.8 0.079 0.084 0.088 0.091 0.093 0.098 0.104 0.110 3.0 3.07 3.15 3.25 3.35 3.45 3.55 3.65 0.118 0.121 0.124 0.128 0.132 0.136 0.140 0.144 3.75 4.0 4.12 4.25 4.5 4.75 4.87 0.148 0.158 0.162 0.167 0.177 0.187 0.192 Tolerances on diameter mm in 0.03 0.04 0.0012 0.0016 Tensile strengths N/mm 2 k
42、gf/mm 2 tonf/in 2 1350/1520 1400/1570 1450/1620 1500/1670 1550/1720 1600/1770 1650/1820 1700/1870 138/155 143/160 148/165 153/170 158/175 163/180 168/186 173/191 87/98 91/102 94/105 97/108 100/111 104/115 107/118 110/121BS4638:1970 BSI 07-1999 British Standards The following are available on applica
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48、638:1970 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions BritishStand
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