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1、BRITISH STANDARD BS 5770-1: 1981 Steel strip intended for the manufacture of springs Part 1: Specification for hot rolled carbon and low alloy steel UDC 669.14.018.27-418-122.4:669.15-194.2 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:57:28 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS
2、5770-1:1981 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 January 1981 BSI 03-1999 The following BSI references relate to the work on this standard: Commi
3、ttee reference ISE/10 Draft for comment 75/74210 DC ISBN 0 580 11480 5 Cooperating organizations The Iron and Steel Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following: British Cast Iron Research Association British Constructi
4、onal Steelwork Association British Internal Combustion Engine Manufacturers Association* British Ironfounders Association British Railways Board* British Shipbuilders British Steel Industry* British Steel Industry Wire Section Concrete Society Limited Council of Ironfoundry Associations Department o
5、f Industry (National Physical Laboratory) Electricity Supply Industry in England and Wales Engineering Equipment Users Association Federation of Civil Engineering Contractors Greater London Council Institute of British Foundrymen Institute of Marine Engineers Institute of Quality Assurance Instituti
6、on of Mechanical Engineers Institution of Production Engineers Institution of Structural Engineers International Tin Research Institute Lloyds Register of Shipping Ministry of Defence National Association of Drop Forgers and Stampers Oil Companies Materials Association Process Plant Association Roya
7、l Institute of British Architects Society of Motor Manufacturers and Traders Limited Steel Casting Research and Trade Association Water-tube Boilermakers Association The organizations marked with an asterisk in the above list, together with the following, were directly represented on the Technical C
8、ommittee entrusted with the preparation of this British Standard: Agricultural Machine Parts Export Association Cold Rolled Sections Association Spring Research and Manufacturers Association Individual expert Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldu
9、n sheffieldun, na, Mon Dec 04 15:57:28 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5770-1:1981 BSI 03-1999i Contents Page Cooperating organizationsInside front cover Forewordii 1Scope1 2References1 3Definitions1 4Designation system1 5Form of supply2 6Information to be supplied by the purchaser2 7S
10、teelmaking process2 8Chemical composition2 9Mechanical properties4 10Response to heat treatment4 11Edge conditions5 12Surface finish5 13Dimensional tolerances5 14Freedom from defects7 15Decarburization7 16Non-metallic inclusions7 17Number of tests7 18Hardness test7 19Bend test8 20Retests8 21Test cer
11、tificates9 22Inspection9 23Packaging and identification9 Figure 1 Edge camber6 Figure 2 Flatness of strip8 Figure 3 Bend test A9 Figure 4 Bend test B9 Table 1 Chemical composition of carbon steels3 Table 2 Chemical composition of alloy steels3 Table 3 Permitted variations of product analysis from sp
12、ecified range of cast analysis for carbon steels: grades 50, 60, 70, 80 and 953 Table 4 Permitted variations of product analysis from specified range of cast analysis for alloy steels: grades 735M50 and 527M604 Table 5 Hardness values4 Table 6 Bend test requirements in the annealed condition4 Table
13、7 Response to heat treatment5 Table 8 Tolerances on thickness5 Table 9 Tolerances on width in the mill edge and rolled square edge conditions (E2 and E6)5 Table 10 Tolerances on width in the sheared or slit edge condition (E3)5 Table 11 Tolerances on length of cut lengths6 Table 12 Maximum edge camb
14、er6 Table 13 Maximum deviations from flatness of cut lengths7 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:57:28 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5770-1:1981 ii BSI 03-1999 Foreword BS 5770, prepared under the direction of the Iron
15、and Steel Standards Committee, is a revision and extension of the requirements for carbon steel spring materials in the 1956 edition of BS 1449 “Steel plate, sheet and strip” which, for the time being, will continue to apply to flat wire for springs. The revision of the requirements for these steels
16、, which have been extended by the introduction of requirements for low alloy and stainless steels, has been prepared under the new number BS 5770 to avoid confusion with BS 1449 in regard to designations and tolerances on dimensions and also to reflect the enlargement of the range of materials speci
17、fied for use in the manufacture of springs. BS 5770 comprises four Parts as follows: Part 1: Specification for hot rolled carbon and low alloy steel; Part 2: Specification for cold rolled carbon and low alloy steel; Part 3: Specification for pre-hardened and tempered carbon steel; Part 4: Specificat
18、ion for martensitic and austenitic stainless steel. 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 ob
19、ligations. Summary of pages This document comprises 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
20、on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:57:28 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5770-1:1981 BSI 03-19991 1 Scope This Part of this British Standard specifies requirements for five grades of hot rolled carbon steel strip and two grades of low a
21、lloy steel strip intended for the manufacture of springs. It covers material from 1.25 mm to 15 mm inclusive in thickness and from 12.5 mm to 450 mm inclusive in width, and supplied in either the hot rolled or annealed condition, having any one of three edge conditions and with one of three surface
22、finishes. This Part covers strip supplied in any one of five forms. 2 References The titles of the standards publications referred to in this Part of this British Standard are listed on the inside back cover. 3 Definitions For the purposes of this British Standard the following definitions apply. 3.
23、1 Edge conditions 3.1.1 mill edge (E2) the natural edge produced when strip is rolled 3.1.2 sheared or slit edge (E3) the edge of strip that has been cut to size by guillotine or rotary cutters 3.1.3 rolled square edge (E6) the edge produced by edge rolling to give an approximately square edge 3.2 S
24、urface finish 3.2.1 pickled finish (P) a hot rolled or a hot rolled and annealed material from which the scale has been removed by chemical means 3.3.2 mechanically descaled finish (D) a hot rolled or a hot rolled and annealed material from which the scale has been removed by mechanical means 4 Desi
25、gnation system 4.1 Symbols for material condition. The following symbols shall be used to denote the material conditions: HS = Hot rolled (see note), HSA = Hot rolled and annealed. NOTEThe hot rolled condition will have a black oxide scale coating unless an alternative finish is specified. 4.2 Symbo
26、ls for surface finishes (other than as rolled). The following symbols shall be used to denote the surface finishes: P = pickled, D = mechanically descaled. 4.3 Symbols for edge conditions. The following symbols shall be used to denote the edge conditions: E2 = mill edge, E3 = sheared or slit edge, E
27、6 = rolled square edge. 4.4 Symbols for tolerances on length of cut lengths. The following symbols shall be used to denote the tolerances on length of cut lengths (see 13.3 and Table 11): L1 = normal tolerance, L2 = precision tolerance. 4.5 Symbols for tolerances on flatness of cut lengths. The foll
28、owing symbols shall be used to denote the tolerances on flatness of cut lengths (see 13.5 and Table 13): F1 = normal tolerance, F2 = precision tolerance. 4.6 Order of designation. The symbols given in 4.1 to 4.5 shall be used in the following sequence to describe the material required: a) material c
29、ondition symbol, followed by the grade of steel; b) surface finish symbol; c) dimensions, width and thickness; d) product form, i.e. coils or cut lengths; e) edge condition; f) length tolerance; g) flatness tolerance. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:57:28 GMT+00:00 2006, Un
30、controlled Copy, (c) BSI BS 5770-1:1981 2 BSI 03-1999 5 Form of supply The material shall be supplied in any one of the following forms: a) in coils of agreed mass and/or dimensions; b) in coils of random mass and/or dimensions; c) in specified uniform cut lengths; d) in specified cut lengths with s
31、hort lengths cut to size; e) in random cut lengths. 6 Information to be supplied by the purchaser The following information shall be given in the enquiry and order to enable the manufacturer to supply the material required. a) The number and Part of this British Standard, i.e. BS 5770-1. b) The cond
32、ition, grade and surface finish of the material (see clause 4). c) The width and thickness of the product. d) Details of the type of product required, e.g. coils, cut lengths etc. (see clause 5). e) The edge condition and length and flatness tolerances (for cut lengths) (see clause 4). f) Whether a
33、test certificate is required (see clauses 17 and 21). g) Whether inspection is to be carried out at the manufacturers works. h) Whether a product analysis is required. i) Details of any special requirements. The information should be given in the enquiry and order using the applicable symbols, e.g.
34、BS 5770-1, HS 80, surface finish P, 50 mm 5 mm, cut lengths 5 m, edge condition E2, length tolerance L1, flatness tolerance F2. BS 5770-1, HSA 70, 100 mm 8.5 mm, coils, edge condition E3. 7 Steelmaking process Unless otherwise agreed at the time of ordering, the processes used in making the steel an
35、d the products shall be left to the discretion of the manufacturer. When requested by the purchaser, the manufacturer shall indicate the steelmaking process used. The grades shall be supplied as fully killed steels. 8 Chemical composition 8.1 Cast analysis. The chemical composition, as determined by
36、 cast analysis, shall be as given in Table 1 and Table 2. 8.2 Product check analysis. The purchaser may, if stated on the order and agreed with the manufacturer, require analysis of the finished material. The analysis of the product may vary from the cast analysis due to heterogeneity arising during
37、 the casting and solidification of the ingot. The variations of the product analysis from the specified range for cast analysis shall not exceed the permitted variations given in Table 3 and Table 4. The variations may occur either above or below the individual element ranges given in Table 1 and Ta
38、ble 2 but shall not be applied both above and below the specified range for any one element in any one cast of steel. If the result of the analysis of a single sample falls outside the permitted variations given in Table 3 and Table 4 on the product analysis, further samples shall be selected for ch
39、eck analysis from the remainder of the consignment as follows: a) for deliveries up to and including 5 tonnes at least two samples from the same cast; b) for deliveries over 5 tonnes up to and including 20 tonnes at least five samples from the same cast; c) for deliveries over 20 tonnes at least eig
40、ht samples from the same cast. The results of the analyses of these samples shall fall within the permitted variations. If any of these further samples are proved to be outside these permitted variations for any significant element, the consignment of steel shall be deemed not to comply with the req
41、uirements of this standard. Samples for product analysis shall be taken in accordance with the requirements of BS 1837 and, in the event of dispute, analysed in accordance with the appropriate methods in British Standard Handbook No. 19. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:57:2
42、8 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5770-1:1981 BSI 03-19993 Table 1 Chemical composition or carbon steels Table 2 Chemical composition of alloy steels Table 3 Permitted variations of product analysis from specified range of cast analysis for carbon steels: grades 50, 60, 70, 80 and 95 (
43、see Table 1) Material grade5060708095 % Elementmin.max.min.max.min.max.min.max.min.max. Carbon0.450.550.550.650.650.750.750.850.901.0 Silicon0.050.350.050.350.050.350.050.350.050.35 Manganese0.700.900.500.900.500.900.500.900.300.60 Phosphorus0.0450.0450.0450.0450.040 Sulphur0.0450.0450.0450.0450.040
44、 NOTE 1The purchaser may specify, on his order, restricted ranges of carbon and manganese within the ranges specified in Table 1. For steels having up to and including 0.85 % C, the minimum range for carbon shall be 0.05 %; (e.g. 0.60 % C to 0.65 % C). Above 0.85 % C the minimum range for carbon sha
45、ll be 0.07 % (e.g. 0.93 % C to 1.00 % C). For all grades in Table 1 steels may be ordered having a minimum range of 0.20 % Mn (e.g. 0.50 % Mn to 0.70 % Mn) when this is required for special applications. In particular, for some springs, manganese contents in the upper part of the range may be desira
46、ble. NOTE 2The upper limit of manganese content for grade 95 may be extended for thicker material by agreement between the manufacturer and the purchaser. NOTE 3The purchaser may specify, on his order, lower maximum levels of sulphur and phosphorus by agreement with the manufacturer (see clause 16).
47、 Material grade735M50527M60 Element% min.% max.% min.% max. Carbon0.460.540.550.65 Silicon0.100.350.100.35 Manganese0.600.900.701.00 Phosphorus0.0350.035 Sulphur0.0350.035 Chromium0.801.100.600.90 Vanadium0.15 NOTEThe purchaser may specify, on his order, lower maximum levels of sulphur and phosphoru
48、s by agreement with the manufacturer (see clause 16). ElementRange in which maximum of specified element fallsVariation on specified range Over max.Under min. % CarbonOver 0.50 up to and including 1.00.040.04 SiliconUp to and including 0.400.030.03 ManganeseUp to and including 1.00.040.04 Phosphorus
49、Up to and including 0.0250.005 Over 0.025 up to and including 0.0400.006 Over 0.040 up to and including 0.0600.008 SulphurUp to and including 0.0250.005 Over 0.025 up to and including 0.0400.006 Over 0.040 up to and including 0.0600.008 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:57:28 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5770-1:1981 4 BSI 03-1999 Table 4 Permitted variations of product analysis from specified range of cast analysis for alloy steels: grades 7