ISO 5954-2014 Cold-reduced carbon steel sheet according to hardness requirements《符合硬度要求的冷轧碳素薄钢板》.pdf

1、 ISO 2014 Cold-reduced carbon steel sheet according to hardness requirements Tles en acier au carbone lamines froid caractristiques spciales de duret INTERNATIONAL STANDARD ISO 5954 Fourth edition 2014-03-15 Reference number ISO 5954:2014(E) ISO 5954:2014(E)ii ISO 2014 All rights reserved COPYRIGHT

2、PROTECTED DOCUMENT ISO 2014 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission.

3、 Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ISO 5954:2014(E)

4、 ISO 2014 All rights reserved iii Contents Page Foreword iv 1 Scope . 1 2 Normative references 1 3 T erms and definitions . 1 4 Dimensions . 2 5 Surface characteristics . 2 5.1 General . 2 5.2 Surface quality . 2 5.3 Surface finish 3 5.4 Suitability for surface coating 3 5.5 Oiling 3 6 Conditions of

5、 manufacture 3 6.1 Steelmaking . 3 6.2 Chemical composition 3 6.3 Chemical analysis 4 6.4 Weldability 5 6.5 Application . 5 6.6 Hardness ranges 5 7 Dimensional tolerances 5 8 Sampling 5 9 Tests . 5 10 Cold bending properties . 5 11 Retests . 6 11.1 Machining and flaws. 6 11.2 Additional tests . 6 12

6、 Resubmission . 6 13 Workmanship 6 14 Inspection and acceptance . 6 15 Coil size . 6 16 Marking 6 17 Information to be provided by the purchaser 7 Bibliography 8 ISO 5954:2014(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies

7、(ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, g

8、overnmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and those intended for its further mai

9、ntenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives). At

10、tention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduct

11、ion and/or on the ISO list of patent declarations received (see www.iso.org/patents). Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement. For an explanation on the meaning of ISO specific terms and expressions related to conf

12、ormity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information The committee responsible for this document is ISO/TC 17, Steel, Subcommittee SC 12, Continuous mill flat rolled p

13、roducts. This fourth edition cancels and replaces the third edition (ISO 5954:2007), which has been technically revised.iv ISO 2014 All rights reserved INTERNATIONAL ST ANDARD ISO 5954:2014(E) Cold-reduced carbon steel sheet according to hardness requirements 1 Scope This International Standard appl

14、ies to cold-reduced carbon steel sheet and corresponding hardness requirements. It is suitable for applications where the surface is of prime importance. The following are common hardness ranges (see 6.6): CRH-50: Rockwell B 50 to 70; CRH-60: Rockwell B 60 to 80; CRH-70: Rockwell B 70 to 90; CRH-NN:

15、 Any Rockwell B range of 20 points up to and including HRB 90 maximum (designated minimum of specified range will be shown). NOTE By agreement between the supplier and purchaser, Rockwell ranges less than 20 points can be specified. This International Standard does not cover commercial quality or dr

16、awing qualities (covered in ISO 3574) and cold-reduced carbon steel strip. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated ref

17、erences, the latest edition of the referenced document (including any amendments) applies. ISO 6508 (all parts), Metallic materials Rockwell hardness test ISO 16162, Cold-rolled steel sheet products Dimensional and shape tolerances 3 T erms a nd definiti ons For the purposes of this document, the fo

18、llowing terms and definitions apply. 3.1 cold-reduced steel sheet product obtained from hot-rolled descaled steel sheet by cold-reducing to the required sheet thickness followed by annealing to recrystallize the grain structure Note 1 to entry: The product is normally supplied in the skin-passed con

19、dition. 3.2 skin pass light cold rolling of the product Note 1 to entry: The purpose of the 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; ISO 2014 All rights reserved 1 ISO 5954:2014(E) c) to obtai

20、n the required surface finish. Note 2 to entry: Some increase in hardness and some loss in ductility will result from skin passing. Cold-reduced sheet supplied in the skin-passed condition tends to strain-age and this might lead to an increase in the hardness value. Because of this, the hardness val

21、ues at the time of shipment will be the determining factor as to whether the hardness requirement has been met. 3.3 lot 50 t or less of sheet of the same designation rolled to the same thickness and condition 4 Dimensions 4.1 The fabrication limits of cold-reduced carbon steel sheet according to har

22、dness requirements are dependent on the specific range of hardness specified or agreed to. It is produced in thicknesses of 0,36 mm and above (commonly produced up to 3 mm) and in widths of 600 mm and over in coils and cut lengths. The hardness is commonly reported as Rockwell B (HRB). 4.2 Cold-redu

23、ced sheet less than 600 mm wide can be slit from wide sheet and will be considered as sheet. 5 Surface characteristics 5.1 General The surface characteristics consist of the surface quality and the surface finish. The surface quality and surface finish shall be as specified by the purchaser at the t

24、ime of the order, in accordance with 5.2 and 5.3. For non-skin-passed products, surface quality B (exposed) is not applicable and no requirement for a particular surface finish can be made. 5.2 Surface quality The products are supplied with either of the surface qualities A or B. 5.2.1 Surface quali

25、ty A (unexposed) Imperfections, such as pores, slight imperfections, small marks, minor scratches, and slight colouring which do not affect the formability or the application of surface coatings, are permitted. 5.2.2 Surface quality B (exposed) The better of the two surfaces shall be free of imperfe

26、ctions which might affect the uniform appearance of quality paint or an electrolytic coating (see 5.4). The other surface shall at least conform to surface quality A. In the case of delivery of coil and slit coil, the percentage of defects might be greater than in the case of delivery in sheet or cu

27、t lengths. This should be taken into account by the purchaser, and the percentage of admissible surface defects can be agreed at the time of the enquiry and order. Unless otherwise agreed, a single surface of the product shall comply with the specified requirements. The other surface shall be such t

28、hat, during subsequent treatment, it does not have a deleterious effect on the better surface.2 ISO 2014 All rights reserved ISO 5954:2014(E) 5.3 Surfac e finish When cold-reduced steel sheet is deformed during fabrication, localized areas might roughen to some degree, and such affected portions of

29、the part might require hand-finishing to prepare the surface for the intended application. By agreement at the time of the enquiry and order, ranges for surface roughness can be specified for specific end uses. 5.4 Suitability for surface coating The products might be required for metallic coating b

30、y the hot dip coating or electrolytic coating process, or organic coating or other coating. When such a coating is intended, it shall be specified at the time of ordering. 5.5 Oiling As a deterrent to rusting, a coating of oil is usually applied to the product. The oil is not intended as a drawing o

31、r forming lubricant and shall be easily removed using degreasing chemicals. The product might be ordered unoiled, if required, in which case, the supplier has limited responsibility if oxidation occurs. 6 Conditions of manufacture 6.1 Steelmaking The processes used in making the steel and in manufac

32、turing cold-reduced sheet according to hardness requirements are left to the discretion of the manufacturer. On request, the purchaser shall be informed of the steelmaking process being used. 6.2 Chemical composition The chemical composition (heat analysis) shall not exceed the values given in Table

33、s 1 and 2. NOTE The hardness requirements are normally obtained by controlling carbon, phosphorus, or a combination of carbon and phosphorous. Table 1 Chemical composition (heat analysis) Mass fraction in per cent Designation C max. Mn max. P max. S max. CRH-50 0,15 0,60 0,15 0,03 CRH-60 0,25 0,60 0

34、,15 0,03 CRH-70 0,25 0,60 0,15 0,03 CRH-NN 0,25 0,60 0,15 0,03 ISO 2014 All rights reserved 3 ISO 5954:2014(E) Table 2 Limits on additional chemical elements Mass fraction in per cent Element Heat analysis max. Product analysis max. Cu a 0,20 0,23 Ni a 0,20 0,23 Cr ab 0,15 0,19 Mo ab 0,06 0,07 Nb c

35、0,008 0,018 V c 0,008 0,018 Ti c 0,008 0,018 aThe 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. bThe s

36、um 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. cAnalysis greater than 0,008 % can be supplied after agreement between the

37、 producer and consumer. 6.3 Chemical analysis 6.3.1 Heat analysis An analysis of each heat of steel shall be made by the manufacturer in order to determine compliance with the requirements given in Tables 1 and 2. On request, at the time of ordering, this analysis shall be reported to the purchaser

38、or 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. 6.3.2 Product analysis A product analysis can be made by the purchaser to verify the specifi

39、ed analysis of the product and shall take into consideration any normal heterogeneity. The product analysis tolerances shall be in accordance with Table 3. Table 3 Product analysis tolerances Element M a x i m u m of s p e c i f ie d e le m e n t % T o le r a n c e o v e r m a x i m u m s p e c i f

40、ie d % Carbon 0,15 0,15 to 0,40 0,03 0,04 Manganese 0,60 0,03 Phosphorus 0,15 0,01 Sulfur 0,04 0,01 NOTE The above maximum tolerance is the allowable excess over the specified requirements and not the heat analysis.4 ISO 2014 All rights reserved ISO 5954:2014(E) 6.4 Weldability This product is norma

41、lly suitable for welding if appropriate welding conditions are selected. The hardness can be changed in the heat-affected zone of the welds. When the mass fraction of carbon exceeds 0,15 % or the mass fraction of phosphorus exceeds 0,05 %, welding becomes more difficult. 6.5 Application It is desira

42、ble that cold-reduced steel sheet and corresponding hardness requirements be identified for fabrication by the name of the part or by the intended application. Proper identification of the part can include visual examination, prints, or description, or a combination of these. Details of fabrication

43、and special requirements (exposed or unexposed, freedom from stretcher strains or fluting) shall be specified, as well as the hardness range. 6.6 Hardness ranges The Rockwell hardness ranges represent the values as-shipped. Table 4 Hardness ranges Designation Hardness ranges HRB a HR30T b CRH-50 50/

44、70 50/62,5 CRH-60 60/80 56,5/70 CRH-70 70/90 62,5/77 CRH-NN As agreed on by the manufacturer and purchaser aFor product thickness 1 mm. bFor product thickness 1 mm. 7 Dimensional tolerances Dimensional tolerances applicable to cold-reduced carbon steel sheet according to hardness requirements shall

45、be as given in ISO 16162. If flatness tolerances are required, they shall be negotiated. 8 Sampling One representative sample for the hardness test required in Table 4 shall be taken from each lot of sheet for shipment. 9 Tests The hardness test shall be carried out in accordance with ISO 6508 on te

46、st pieces taken midway between the centre and the edge of the sheet as rolled. 10 Cold bending properties Although bend tests are not required, CRH-50 is expected to be capable of being bent flat on itself through 180, both parallel and perpendicular to the rolling direction. CRH-60 is expected to b

47、e capable of being bent through 90, with the axis of bend parallel to the rolling direction on a 1 thickness radius, or flat on itself perpendicular to the rolling direction with a 1 thickness radius. CRH-70 is expected to be capable of being bent 90 with a 1 thickness radius perpendicular to the ro

48、lling direction. By agreement between the supplier and purchaser, a bend test can be carried out with these or other values of bend radii. ISO 2014 All rights reserved 5 ISO 5954:2014(E) 11 Retests 11.1 Machining and fla w s If any test piece shows defective areas, it shall be discarded and another

49、piece substituted. 11.2 Additional tests If a test does not give the specified results, two more tests shall be carried out at random on the same lot. Both retests shall conform to the requirements of this International Standard, otherwise the lot might be rejected. 12 Resubmission The manufacturer can resubmit for acceptance the products that have been rejected during earlier inspection due to unsatisfactory properties, after the manufacturer has subjected them to a suitable treatment (for example, selection or heat tr