1、BRITISH STANDARDBS ISO 4960:2007Cold-reduced carbon steel strip with a mass fraction of carbon over 0,25 %ICS 77.140.50g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g
2、42g43g55g3g47g36g58BS ISO 4960:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2008 BSI 2008ISBN 978 0 580 56309 6National forewordThis British Standard is the UK implementation of ISO 4960:2007.The UK participation in its prep
3、aration was entrusted to Technical Committee ISE/10, Flat rolled steels products.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its co
4、rrect application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments/corrigenda issued since publicationDate CommentsReference numberISO 4960:2007(E)INTERNATIONAL STANDARD ISO4960Third edition2007-12-15Cold-reduced carbon steel strip with a mass fraction of c
5、arbon over 0,25 % Feuillards en acier au carbone lamins froid teneur en carbone suprieure 0,25 % BS ISO 4960:2007ii iiiContents Page Foreword iv 1 Scope 1 2 Normative references 1 3 Terms and definitions .2 4 Specified qualities appropriate to the particular grade .2 5 Conditions of manufacture .3 5
6、.1 Steelmaking3 5.2 Chemical composition 3 5.3 Heat analysis3 5.4 Product analysis 3 5.5 Surface finish .5 5.6 Oiling.5 5.7 Weldability5 5.8 Application .5 5.9 Mechanical properties.5 6 Ordering requirements and dimensional tolerances .8 6.1 Ordering requirements8 6.2 Dimensional tolerances 8 7 Samp
7、ling.8 8 Mechanical property tests 8 8.1 Hardness test .8 8.2 Tensile test .8 9 Decarburization9 10 Retests 9 10.1 Machining and flaws9 10.2 Additional tests9 11 Resubmission 11 12 Workmanship .11 13 Inspection and acceptance.11 14 Coil size 11 15 Marking .11 16 Information to be supplied by the pur
8、chaser .12 Bibliography 13 BS ISO 4960:2007iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each mem
9、ber body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International El
10、ectrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards ado
11、pted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of pat
12、ent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 4960 was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 12, Continuous mill flat rolled products. This third edition cancels and replaces the second edition (ISO 4960:1999), which has
13、been technically revised. BS ISO 4960:20071Cold-reduced carbon steel strip with a mass fraction of carbon over 0,25 % 1 Scope 1.1 This International Standard applies to cold-reduced carbon steel strip with a mass fraction of carbon over 0,25 % made from the steels specified in Table 1. It is commonl
14、y produced in thicknesses of 6 mm and under, and in widths up to 600 mm exclusive, in coils and cut lengths. The strip is ordered in the as-delivered condition, as specified in 6.1 or Clause 5, and is predominantly used for springs, but also for other highly stressed parts of many different types. S
15、teel designations CS55 to CS95 may be supplied in the quenched and tempered condition. 1.2 This International Standard does not apply to alloy steels or stainless steels. 1.3 Cold-reduced carbon steel strip is furnished in the following types: a) full hard, where a very stiff, springy product is pro
16、duced to obtain full hardness after the final rolling (it is intended for flat work not requiring the ability to withstand cold forming); b) annealed, which is intended for applications requiring moderate cold forming; c) quenched and tempered, which is intended generally for the production of steel
17、 springs where the appropriate combination of strength, hardness, toughness and ductility can be achieved; d) intermediate hardness, which is intended for applications where cold forming is slight or where a moderately stiff, springy product is needed. 1.4 Cold-reduced carbon steel strip is characte
18、rized by close dimensional tolerances and good surface finish and, in the cold-rolled and quenched and tempered condition, it is possible to attain high values for hardness and tensile strength. 2 Normative references The following referenced documents are indispensable for the application of this d
19、ocument. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 6507-1, Metallic materials Vickers hardness test Part 1: Test method ISO 6508-1, Metallic materials Rockwell hardness test Part
20、 1: Test method (scales A, B, C, D, E, F, G, H, K, N, T) ISO 6892, Metallic materials Tensile testing Method of testing at ambient temperature BS ISO 4960:20072 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 cold-reduced carbon steel strip p
21、roduct produced from a hot-rolled pickled coil which has been given substantial cold reduction NOTE The product is characterized by an improved surface, greater uniformity in thickness and improved mechanical properties compared to hot-rolled strip. Cold-reduced strip is also characterized by tighte
22、r thickness tolerances than cold-reduced sheet, as well as specified edges. 3.2 skin pass light cold rolling of the product NOTE 1 The purpose of skin passing is one or more of the following: a) to minimize the appearance of coil breaks, stretcher strains and fluting b) to control the shape; c) to o
23、btain the required surface finish. NOTE 2 Some increase in hardness and some loss in ductility will result from skin passing. 3.3 Edges Material is normally supplied as described in 3.3.1 and 3.3.2. Other edges may be supplied as agreed between the manufacturer and purchaser. 3.3.1 mill edge normal
24、side edge without any definite contour produced in hot rolling NOTE Mill edges may contain some irregularities, such as cracked or torn edges or thin (feathered) edges. 3.3.2 sheared edge normal edge obtained by shearing, slitting or trimming a mill-edge product NOTE Normal processing does not neces
25、sarily provide a definite positioning of the slitting burr. 4 Specified qualities appropriate to the particular grade The cold-reduced carbon steel strip qualities appropriate to the particular grade shall be the following: a) full-hard quality: material rolled to the final thickness with a minimum
26、hardness; b) annealed quality: annealed to a hardness or tensile strength; c) quenched and tempered quality: quenched and tempered steel strip for steel designations of CS55 and over, tempered to properties; d) intermediate quality: temper rolled to a hardness range by a controlled amount of cold ro
27、lling after annealing. BS ISO 4960:200735 Conditions of manufacture 5.1 Steelmaking Unless otherwise agreed, the processes used in making the steel and in manufacturing cold-reduced strip are left to the discretion of the manufacturer. On request, the purchaser shall be informed of the steelmaking p
28、rocess being used. 5.2 Chemical composition The chemical composition (heat analysis) shall not exceed the values given in Tables 1 and 2. 5.3 Heat analysis An analysis of each heat of steel shall be made by the manufacturer, in order to determine compliance with the requirements of Tables 1 and 2. W
29、hen requested at the time of ordering, this analysis shall be reported to the purchaser or to his representative. Each of the elements listed in Table 1 shall be included in the report of the heat analysis. If one or more of the elements in Table 2 is/are specified, the analysis shall be reported. 5
30、.4 Product analysis A product analysis may be made by the purchaser, in order to verify the specified analysis of the semi-finished or finished steel and shall take into consideration any normal heterogeneity. For killed steels, the sampling method and deviation limits shall be agreed upon between t
31、he interested parties at the time of ordering. The product analysis tolerances shall be in accordance with Table 3. Table 1 Chemical composition (heat analysis) Mass fractions in percent Designation Carbon Manganese aPhosphorus bmax. Sulfur bmax. Silicon cCS30 0,28 to 0,34 0,60 to 0,90 0,035 0,03 0,
32、10 to 0,35 CS35 0,32 to 0,38 0,60 to 0,90 0,035 0,03 0,10 to 0,35 CS40 0,37 to 0,44 0,60 to 0,90 0,035 0,03 0,10 to 0,35 CS45 0,43 to 0,50 0,60 to 0,90 0,035 0,03 0,10 to 0,35 CS50 0,48 to 055 0,60 to 0,90 0,035 0,03 0,10 to 0,35 CS55 0,50 to 0,60 0,60 to 0,90 0,035 0,03 0,10 to 0,35 CS60 0,55 to 0,
33、65 0,60 to 0,90 0,035 0,03 0,10 to 0,35 CS65 0,60 to 0,70 0,60 to 0,90 0,035 0,03 0,10 to 0,35 CS70 0,65 to 0,75 0,60 to 0,90 0,035 0,03 0,10 to 0,35 CS75 0,70 to 0,80 0,40 to 0,70 0,035 0,03 0,10 to 0,35 CS85 0,80 to 0,93 0,70 to 1,00 0,035 0,03 0,10 to 0,35 CS95 0,90 to 1,03 0,30 to 0,50 0,035 0,0
34、3 0,10 to 0,35 aOther manganese values can be specified upon agreement at the time of ordering, provided a range of 0,30 % is maintained. bWhen specified, phosphorus and sulfur may be ordered to 0,020 % maximum by heat analysis. cCloser silicon ranges can be provided upon agreement at the time of or
35、dering.BS ISO 4960:20074 Table 2 Limits on additional chemical elements Mass fractions in percent Elements Heat analysis max. Product analysis max. Cu a(CS30CS75) (CS85CS95) 0,30 0,25 0,33 0,28 Ni a(CS30CS75) (CS85CS95) 0,20 0,25 0,23 0,28 Cr a,b,c(CS30CS75) (CS85CS95) 0,20 0,30 0,24 0,34 Mo a,b0,06
36、 0,07 Nb d0,008 0,018 V d0,008 0,018 Ti d0,008 0,018 a The sum of copper, nickel, chromium and molybdenum shall not exceed 0,50 % on heat analysis. When one or more of these elements are specified, the sum does not apply; in which case, only the individual limits on the remaining elements will apply
37、. b The sum of chromium and molybdenum shall not exceed 0,16 % on heat analysis. When one or more of these elements are specified, the sum does not apply; in which case, only the individual limits on the remaining elements will apply. c A higher value of Cr may be supplied after agreement between th
38、e producer and consumer. d An analysis greater than 0,008 % may be supplied after agreement between the producer and consumer. Table 3 Product analysis Tolerances in percent Element Maximum of specified element Tolerance over maximum specified Carbon 0,15 to u 0,40 0,40 to u 0,80 0,80 0,04 0,05 0,06
39、 Manganese u 0,60 0,60 to u 1,15 0,03 0,04 Silicon 0,30 to u 0,60 0,05 Phosphorus u 0,04 0,01 Sulfur u 0,04 0,01 NOTE The above maximum tolerances are the allowable excesses over the specified requirements, and not the heat analysis. BS ISO 4960:200755.5 Surface finish Cold-reduced carbon steel stri
40、p is produced in a regular bright finish by rolling on rolls having a moderately smooth finish (it is not generally applicable to bright plating); or in a dull finish by rolling on rolls roughened by mechanical or chemical means. The dull finish is suitable for lacquer or paint adhesion. Quenched an
41、d tempered strip see 1.3 c) may be supplied with the following surface finishes: a) grey-blue unpolished; b) bright tempered; c) rough, medium or fine polished; d) polished and temper colored (blue or bronze). 5.6 Oiling As a deterrent to rusting, a coating of oil is usually applied to the product.
42、The oil is not intended as a forming lubricant and should be easily removable using degreasing chemicals. The product may be ordered unoiled, if required, in which case the supplier has limited responsibility if oxidation occurs. 5.7 Weldability This product is suitable for welding if appropriate we
43、lding conditions are selected. 5.8 Application It is desirable to identify the specified product for fabrication by the name of the part or by the intended application. Proper identification of the part may include visual examination, prints or description, or a combination of these. 5.9 Mechanical
44、properties 5.9.1 Hardness ranges When required see 6.1 and Clause 16 h) the hardness shall be as stated in Tables 4, 5 or 7. Intermediate hardness ranges shall be as shown in Table 8, or shall be as agreed upon between the manufacturer and the purchaser. HV is the Vickers hardness. HR is the Rockwel
45、l hardness. HRB is the Rockwell hardness (type B). 5.9.2 Tensile properties When required see 6.1 and Clause 16 h) the tensile properties shall be as stated in Tables 5 and 6, at the time the steel is made available for shipment if the mechanical property designation is specified. BS ISO 4960:20076
46、Table 4 Minimum hardness requirements for full-hard cold-reduced carbon steel strip Hardness min. HV HV HV HR Specified thickness, mm CS30 to CS45 CS50 to CS70 CS75 to CS95 CS30 to CS95 0,36 mm to u 1 mm. HR15T should be used for thicknesses u 0,36 mm. bLower maximum values of hardness or lower maxi
47、mum levels of tensile strength and higher elongation values may be specified when ordering. cElongation values apply only to thicknesses 0,5 mm to u 3 mm: for greater thicknesses, elongation values shall be as agreed upon. BS ISO 4960:20077Table 6 Tensile strength range for quenched and tempered col
48、d-reduced carbon steel strip Designation Tensile strength, Rmrange aMPa Maximum thickness up to which the tensile values apply bmm CS55 1 150 1 180 1 230 1 275 1 320 1 400 1 465 300 350 365 375 390 415 335 1 HR30T 6 81 45 230 240 250 W 1 HRB 10 97 50 220 230 240 BS ISO 4960:20078 6 Ordering requirem
49、ents and dimensional tolerances 6.1 Ordering requirements The material shall be ordered in accordance with either hardness or tensile strength requirements, but not with both. 6.2 Dimensional tolerances Dimensional tolerances shall be in accordance with Tables 9 to 13 inclusive. When required, specified tolerances shall be as agreed between the manufacturer and purchaser. It has not been practicable to formulate flatness tolerances for material covered by this International Standard. 7 Sampling One representative sample for the hardness or tensile tes
