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1、BRITISH STANDARD BS 2803:1980 Incorporating Amendment No. 1 Specification for Pre-hardened and tempered carbon and low alloy round steel wire for springs for general engineering purposes UDC 62 272:669.14 426:669.14.018.27 156/ 157 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:48:45 GMT+
2、00:00 2006, Uncontrolled Copy, (c) BSI BS 2803:1980 This British Standard, having been prepared under the direction of the Iron and Steel Standards Committee, was published under the authority of the Executive Board and comes into effect on 30 September 1980 BSI 03-1999 First published December 1956
3、 First revision September 1980 The following BSI references relate to the work on this standard: Committee reference ISM/26 Draft for comment 78/76876 DC ISBN 0 580 11424 4 Cooperating organizations The Iron and Steel Standards Committee, under whose direction this British Standard was prepared, con
4、sists of representatives from the following Government departments and scientific and industrial organizations: British Cast Iron Research AssociationInstitute of Marine Engineers British Constructional Steelwork Institute of Quality Assurance* AssociationInstitution of Mechanical Engineers British
5、Internal Combustion EngineInstitution of Production Engineers Manufacturers AssociationInstitution of Structural Engineers British Ironfounders AssociationInternational Tin Research Institute British Railways BoardLloyds Register of Shipping British ShipbuildersMinistry of Defence British Steel Indu
6、stry*National Association of Drop Forgers and British Steel Industry (Wire Section)*Stampers Concrete Society LimitedOil Companies Materials Association Council of Ironfoundry AssociationsProcess Plant Association Department of Industry (National Physical Royal Institute of British Architects Labora
7、tory)Society of Motor Manufacturers and Traders Electricity Supply Industry in England and Limited* WalesSteel Casting Research and Trade Engineering Equipment Users Association*Association Federation of Civil Engineering ContractorsWater-tube Boilermakers Association Greater London Council The orga
8、nizations 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 Wire Netting AssociationSociety of Chain Link Fencing Fencing Contractors AssociationManufacturers Furnishing
9、Spring Makers FederationSpring Research and Manufacturers Music Wire Export AssociationAssociation Patented Steel Wire Association Amendments issued since publication Amd. No.Date of issueComments 5044February 1986Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Wed
10、Nov 29 02:48:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2803:1980 BSI 03-1999i Contents Page Cooperating organizationsInside front cover Forewordii Section 1. General 1Scope1 2References1 3Information to be supplied by the purchaser1 4Manufacture1 5Selection of test pieces1 6Mechanical testing
11、2 7Dimensions and tolerances2 8Examination for defects3 9Retests3 10Packing and identification3 Section 2. Specific requirements for carbon steel wires 11General4 12Production range and quality codes for carbon steel wires4 13Chemical composition of carbon steels4 14Standard sizes and tensile streng
12、ths for carbon steel wires4 15Decarburization, surface and internal defects in carbon steels5 Section 3. Specific requirements for low alloy steel wires 16General6 17Production range and quality codes for low alloy steel wires6 18Chemical composition of low alloy steels6 19Standard sizes and tensile
13、 strengths for low alloy steel wires6 20Decarburization, surface and internal defects in low alloy steels6 Appendix A Product analysis and permitted variations9 Table 1 Tolerances on diameter and ovality2 Table 2 Tolerances on length of straight lengths2 Table 3 Production range and quality codes fo
14、r carbon steel wires4 Table 4 Chemical composition of carbon steel wires4 Table 5 Standard sizes and tensile strengths for carbon steel wires4 Table 6 Decarburization limits for carbon steel wires5 Table 7 Surface defect limits for carbon steel wires6 Table 8 Production range, grades and quality cod
15、es for low alloy steel wires6 Table 9 Chemical composition of low alloy steel wires6 Table 10 Standard sizes and tensile strengths for low alloy steel wires7 Table 11 Decarburization limits for low alloy steel wires8 Table 12 Surface defect levels for low alloy steel wires8 Table 13 Permitted variat
16、ions of product analysis from specified ranges9 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:48:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2803:1980 ii BSI 03-1999 Foreword This edition of BS 2803, prepared under the direction of the Iron
17、and Steel Standards Committee, has been very extensively revised and is now retitled and fully metricated. BS 2803:1956 is now withdrawn. For the convenience of the user, separate sections cover the requirements for carbon and low alloy steel wires. Provision has been made for the supply of wire acc
18、ording to the type of duty for which the manufactured springs are intended and to which appropriate grade designations are allocated. Standard and preferred sizes of wire have been added to the specification. The size ranges listed may not be available, however, from every manufacturer without restr
19、iction. 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 Standard does not of itself confer immunity from legal obligations. Summary of pages This document co
20、mprises a front cover, an inside front cover, pages i and ii, pages 1 to 10, an inside back cover 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: sh
21、effieldun sheffieldun, na, Wed Nov 29 02:48:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2803:1980 BSI 03-19991 Section 1. General 1 Scope This British Standard specifies the requirements for pre-hardened and tempered plain carbon and low alloy round steel wire, supplied in coils or straight len
22、gths, suitable for the manufacture of mechanical springs for static and dynamic applications. It is generally applicable to wire sizes in the range from 0.25 mm to 12.5 mm. NOTEPre-hardened and tempered wire is defined as wire which has been hardened and tempered by a continuous process to produce a
23、 structure of tempered martensite so that it needs no further hardening and tempering after spring forming. 2 References The titles of the publications referred to in this standard are listed on the inside back cover. 3 Information to be supplied by the purchaser 3.1 The following information shall
24、be given on the enquiry or order. a) The number of this British Standard i.e. BS 2803. b) The wire designation (see 3.2). c) The nominal diameter of the wire (see Table 5 and Table 10). d) The tensile strength range if grade 685A55 is ordered (see Table 10). e) Any applicable requirements from the a
25、ppropriate clauses for: 1) condition of wire (see 4.4); 2) non-destructive testing (see 8.4); 3) packing and identification (see clause 10). f) Any other special requirements. 3.2 The wire shall be designated by the number of this British Standard, a six digit number corresponding to the chemical co
26、mposition of the steel, together with the two letters corresponding to the quality code as given in Table 3 and Table 8. Example: BS 2803, 730A65, HS, 2.80 mm. (High duty static low chromium vanadium spring wire of 2.80 mm diameter.) 4 Manufacture 4.1 Steelmaking process. The steel may be made by an
27、y process except that air and mixed air-oxygen bottom blown converter processes shall not be used. In the case of the oxygen process, the nitrogen content of the steel shall not exceed 0.008 %. 4.2 Chemical composition. The chemical compositions of the steels specified in sections 2 and 3 are based
28、on cast analysis. On request, the wire manufacturer shall supply the cast analysis for the specified elements. Any subsequent analytical checks shall take into consideration the heterogeneity normal to the steel (see Appendix A). 4.3 Freedom from defects 4.3.1 The ingots, blooms or billets shall be
29、so prepared as to remove surface imperfections which might produce defects in the wire made from them. 4.3.2 The rod from which the wire is drawn shall be free from harmful surface defects, pipe and other flaws (see also 4.4 for finished wire). 4.3.3 Should it be necessary to grind the wire to meet
30、the specified defect and decarburization limits given in Table 6, Table 7, Table 11 and Table 12, the grinding shall be at a stage during manufacture such that all residual grinding marks are completely eliminated by subsequent drawing. 4.4 Condition of finished wire 4.4.1 Wire shall be supplied in
31、the pre-hardened and tempered condition. 4.4.2 The wire shall be free from harmful surface defects. If required, the level of non-metallic inclusions present in the wire and the method used to assess the level shall be agreed by the purchaser and supplier at the time of the enquiry and order. 4.4.3
32、Wire supplied in coil, unless otherwise agreed between the manufacturer and purchaser, shall run out straight from the coil. Attention is drawn to the need for precautions when releasing the binders. 4.4.4 The straightness of wire supplied in lengths shall conform to tolerances to be agreed between
33、the manufacturer and the purchaser. 5 Selection of test pieces 5.1 All tests shall be carried out on the material in the condition in which it is to be supplied to the user. Apart from straightening the test pieces prior to testing if necessary, they shall not be treated in any way which may make th
34、em unrepresentative of the batch of which they are a sample. 5.2 Test pieces for mechanical tests shall be taken from each end of every coil. Wire supplied in straight lengths shall be grouped in such a manner as to be clearly identified with the coil from which the lengths have been cut. Two test p
35、ieces selected at random from the lengths shall then be considered to be representative of that coil of wire. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:48:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2803:1980 2 BSI 03-1999 5.3 Test pieces for surface defect examination shall be
36、selected as specified in 5.2, except for the NS quality (see Table 3) for carbon steels where the sampling rate shall be at the discretion of the wire manufacturer to ensure compliance with the requirements of clause 15 for carbon steel wires and clause 20 for low alloy steel wire. 6 Mechanical test
37、ing 6.1 Tensile test. The procedures for mechanical testing shall be in accordance with the requirements of BS 4545. 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 than 40 % of the test length
38、 per minute. NOTEBS 4545 stipulates that the tensile strength shall be calculated on the nominal dimensions of the wire unless otherwise specified. The tensile strength for all qualities of carbon steel wire shall be in accordance with the values shown in Table 5 and for low alloy steel wire, in acc
39、ordance with the values shown in Table 10. For non-standard sizes the tensile strength shall be that applicable to the next larger standard size. 6.2 Torsion test. The torsion test shall be applied to all qualities of wire in the size range 1.5 mm to 10 mm diameter inclusive. The test piece shall wi
40、thstand being twisted, without failure, 10 turns in a gauge length equivalent to 100 the wire diameter. If the gauge length is greater or less than 100 the wire diameter, the number of twists shall be adjusted in proportion to the gauge length. The test shall be continued until fracture occurs, when
41、 the primary fracture shall be perpendicular to the axis of the wire and the surface shall not split. During fly-back of the wire, secondary fractures may occur and these shall be ignored. 6.3 Bend test. The bend test shall be applied to all qualities of wire of 3 mm and larger diameters. The wire s
42、hall not show sign of failure when bent through 180 to form a “U” around a mandrel of diameter equal to one and a half times the wire diameter. In carrying out the test, the wire shall be free to move longitudinally in the forming device. To avoid the need for holding an excessive number of mandrel
43、sizes, the wire shall be deemed to have complied with the specification if it is bent around a mandrel smaller than that specified. 6.4 Wrapping test. The wrapping test shall be applied to all qualities of wire of diameters of 1 mm up to and including 3 mm. The wire shall not show sign of failure wh
44、en coiled eight complete turns around a mandrel of diameter equal to that of the wire. 7 Dimensions and tolerances 7.1 Standard sizes. The nominal diameters shown in Table 5 and Table 10 for carbon and low alloy wire respectively are the standard sizes, the first preference in sizes being shown in b
45、old type. 7.2 Diameter tolerances and ovality. The minimum and maximum diameters shall be measured by micrometer at the same section on a straight piece of wire. Ovality is defined as the difference between the maximum and the minimum axes of the wire, measured at any one cross section. Each measure
46、ment shall be within the tolerance for diameter and ovality given in Table 1 for the appropriate nominal diameter of wire. Table 1 Tolerances on diameter and ovality 7.3 Straight length tolerances. When supplied in straight lengths, the lengths shall not be less than those given in the order and sha
47、ll not exceed the positive tolerances given in Table 2. Table 2 Tolerances on length of straight lengths Nominal wire diameter Tolerance on diameter Maximum ovality OverUp to and including Wire in coil Wire in straight lengths Wire in coil Wire in straight lengths mmmmmmmmmmmm 0.250.40 0.005 0.008 0
48、.0050.008 0.401.00 0.010 0.015 0.0100.015 1.001.90 0.015 0.020.0150.02 1.903.15 0.02 0.030.020.03 3.155.60 0.03 0.050.030.05 5.608.50 0.04 0.060.040.06 8.50 10.00 0.05 0.070.050.07 10.00 12.50 0.06 0.080.060.08 Lengths Plus toleranceOverUp to and including mmmmmm 160By agreement 1603152 3155003 5008
49、004 8001 2505 1 2502 0007 2 00013 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:48:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2803:1980 BSI 03-19993 8 Examination for defects 8.1 General. All qualities of wire shall be examined for surface defects either by the method specified in 8.2 or by that specified in 8.3. Where deemed necessary, the aforementioned tests may be supplemented by continuous testing of the whole coil (see 8.4). Tests for decarburization shall be as specified in 8.5 and, whe