ISO 4995-2014 Hot-rolled steel sheet of structural quality《结构改进的热轧薄钢板》.pdf

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1、 ISO 2014 Hot-rolled steel sheet of structural quality Tles en acier de construction lamines chaud INTERNATIONAL STANDARD ISO 4995 Sixth edition 2014-10-01 Reference number ISO 4995:2014(E) ISO 4995:2014(E)ii ISO 2014 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2014 All rights reserved. Unl

2、ess 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. Permission can be requested from either ISO at the

3、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 4995:2014(E) ISO 2014 All rights reserved iii Contents Page Fore

4、word iv 1 Scope . 1 2 Normative references 1 3 T erms and definitions . 1 4 Dimensions . 2 5 Conditions of manufacture 2 5.1 Steelmaking . 2 5.2 Chemical composition 2 5.3 Chemical analysis 2 5.4 Mechanical properties 4 5.5 Application . 4 5.6 Weldability 4 5.7 Surface condition 4 5.8 Oiling 5 6 Dim

5、ensional and shape tolerances . 5 7 Tensile test sampling . 5 8 Tensile test 5 9 Retests . 5 9.1 Machining and flaws. 5 9.2 Elongation . 5 9.3 Additional tests . 5 10 Resubmission . 5 11 Workmanship 6 12 Inspection and acceptance . 6 13 Coil size . 6 14 Marking 6 15 Information to be supplied by the

6、 purchaser. 6 Bibliography 8 ISO 4995:2014(E) 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

7、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

8、ectrotechnical Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different type

9、s of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directives Attention 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 r

10、esponsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received. www.iso.org/patents Any trade name used in this document is information given f

11、or the convenience of users and does not constitute an endorsement. For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following U

12、RL: Foreword - Supplementary information The committee responsible for this document is ISO/TC 17, Steel, Subcommittee SC 12, Continuous mill flat rolled products. This sixth edition cancels and replaces the fifth edition (ISO 4995:2008), which has been technically revised.iv ISO 2014 All rights res

13、erved INTERNATIONAL ST ANDARD ISO 4995:2014(E) Hot-rolled steel sheet of structural quality 1 Scope This International Standard applies to hot-rolled steel sheet of structural quality in the grades listed in Table 1, usually prepared without the use of microalloying elements. The product is intended

14、 for structural purposes where particular mechanical properties are required. It is generally used in the delivered condition and is intended for bolted, riveted, or welded structures. This product is produced on a wide strip mill, not a plate mill. This International Standard does not cover steels

15、intended for boilers or pressure vessels, steels designated as commercial quality or drawing quality (covered in ISO 3573 1 ), steels to be re-rolled to cold-reduced products, or steels designated as weathering steels, having increased atmospheric corrosion resistance. 2 Normative references The fol

16、lowing documents, in whole or in part, are normatively referenced in this document and are indispensable to its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 6892-1, Met

17、allic materials Tensile testing Part 1: Method of test at room temperature ISO 13976, Hot-rolled steel sheet in coils of structural quality and heavy thickness ISO 16160, Hot-rolled steel sheet products Dimensional and shape tolerances 3 T erms an d definiti ons For the purposes of this document, th

18、e following terms and definitions apply. 3.1 microalloying element element, such as niobium, vanadium, titanium, added singly or in combination to obtain higher strength levels combined with better formability, weldability, and toughness as compared with non-alloyed steel produced to equivalent stre

19、ngth levels 3.2 hot-rolled steel sheet product obtained by rolling heated steel through a continuous-type or reversing-type wide strip-mill to the required sheet thickness, the product having a surface covered with oxide or scale resulting from the hot-rolling operation 3.3 hot-rolled descaled steel

20、 sheet hot-rolled steel sheet from which oxide or scale has been removed, commonly by pickling in an acid solution Note 1 to entry: Descaling may also be performed by mechanical methods such as grit blasting. Some change in properties can result from descaling. 3.4 edges ISO 2014 All rights reserved

21、 1 ISO 4995:2014(E) 3.4.1 mill edge normal side edge without any definite contour produced in hot rolling Note 1 to entry: Mill edges can contain some irregularities, such as cracked or torn edges or thin (feathered) edges. 3.4.2 sheared edge normal edge obtained by shearing, slitting, or trimming a

22、 mill edge product Note 1 to entry: Normal processing does not necessarily provide a definite positioning of the slitting burr. 3.5 aluminum killed steel which has been deoxidized with aluminum is sufficient to prevent the evolution of gas during solidification 3.6 lot 50 t or less of sheet of the s

23、ame grade rolled to the same thickness and condition 4 Dimensions 4.1 This product is commonly produced in thicknesses from 1,6 mm to 6 mm and in widths of 600 mm and over, in coils and cut lengths. 4.2 Hot-rolled sheet less than 600 mm wide may be slit from wide sheet and will be considered as shee

24、t. NOTE Hot-rolled sheet up to but not including 3 mm in thickness is commonly known as “sheet”. Hot-rolled sheet 3 mm and over in thickness is commonly known as either “sheet” or “plate”. 5 Conditions of manufacture 5.1 Steelmaking Unless otherwise agreed by the interested parties, the processes us

25、ed in making the steel and in manufacturing hot-rolled sheet are left to the discretion of the manufacturer. On request, the purchaser shall be informed of the steelmaking process being used. 5.2 Chemical composition The chemical composition (heat analysis) shall conform to the requirements given in

26、 Tables 1 and 2. 5.3 Chemical analysis 5.3.1 Heat analysis An analysis of each heat 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 or the purchaser

27、s representative. Each of the elements listed in Table 2 shall be included in the report of the heat analysis.2 ISO 2014 All rights reserved ISO 4995:2014(E) 5.3.2 Product analysis A product analysis may be made by the purchaser in order to verify the specified analysis of the product and shall take

28、 into consideration any normal heterogeneity. The sampling method shall be agreed upon between the interested parties at the time of ordering. The product analysis tolerances shall be in accordance with Table 2 and Table 3. Table 1 Chemical composition (heat analysis) Mass fractions in per cent Grad

29、e C max. Mn max. Si max. P max. S max. HR235 0,17 1,20 Not applicable 0,035 0,035 HR275 0,20 1,20 Not applicable 0,035 0,035 HR355 0,20 1,50 0,55 0,035 0,035 Table 2 Limits on additional chemical elements a Mass fractions in per cent Element Heat analysis max. Product analysis max. Cu b 0,20 0,23 Ni

30、 b 0,20 0,23 Cr bc 0,15 0,19 Mo bc 0,06 0,07 Nb d 0,008 0,018 V d 0,008 0,018 Ti d 0,008 0,018 aEach of the elements listed in this table shall be included in the report of the heat analysis. When the amount of copper, nickel, chromium, or molybdenum present is less than 0,02 %, the analysis may be

31、reported as “ 0,02 %”. bThe 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. cThe sum of chromium and mol

32、ybdenum 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. dHeat analysis greater than 0,008 % may be supplied upon agreement between producer and consumer

33、. Table 3 Product analysis tolerances Mass fractions in per cent Element M a x i mu m of s p e c i f ie d element Tolerance over maxi- mu m s p e c i f ie d C 0,21 0,04 Mn 1,50 0,05 P 0,035 0,010 S 0,035 0,010 Si 0,55 0,05 NOTE The above maximum tolerance is the allowable excess over the specified r

34、equirement and not the heat analysis. For example, for Grade HR355, the following product analysis values are within these tolerances: C 0,24 %, Mn 1,55 %, P 0,045 %, S 0,045 %, Si 0,60 %. ISO 2014 All rights reserved 3 ISO 4995:2014(E) 5.4 Mechanical properties At the time that the steel is made av

35、ailable for shipment, the mechanical properties shall be as stated in Table 4 when they are determined on test pieces obtained in accordance with the requirements of Clause 7. 5.5 Application It is desirable that hot-rolled steel sheet be identified for fabrication by the name of the part or by the

36、intended application. Proper identification of the part may include visual examination, prints, or description, or a combination of these. 5.6 Weldability This product is normally suitable for welding when appropriate welding conditions are selected. For non- descaled steel, it may be necessary to r

37、emove the scale or oxide depending upon the welding method. As the carbon content increases above 0,15 %, spot welding becomes increasingly difficult. Table 4 Mechanical properties Grade a R emin. bMPa R mmin. (information only) MPa A min. % c e 3 3 e 6 R eH R eL L o= 50 mm L o= 80 mm L o= 5,65 S o

38、L o= 50 mm HR235 235 215 330 20 18 23 22 HR275 275 255 370 17 15 20 18 HR355 355 335 450 15 13 19 16 R eyield strength R eHupper yield strength R eLlower yield strength R mtensile strength A percentage elongation after fracture e thickness of steel sheet, in mm L ooriginal gauge length on test piece

39、 S ooriginal cross-sectional area of gauge length 1 MPa = 1 N/mm 2 aFormerly designated as grades Fe37, Fe44, and Fe52. bEither R eHor R eLshall be specified, but not both. The measured value shall meet the minimum requirement. The yield strength values can be measured by 0,5 % elongation proof stre

40、ngth (proof strength under load) or by 0,2 % offset when a definite yield phenomenon is not present. cFor thicknesses up to 3 mm, use either L o= 50 mm or L o= 80 mm. For thicknesses of 3 mm to 6 mm, use LS oo =56 5 , or L o= 50 mm. In case of dispute, only the results obtained on a 50 mm test piece

41、 will be valid. 5.7 Surface condition Oxide or scale on hot-rolled steel sheet is subject to variations in thickness, adherence, and colour. Removal of the oxide or scale by pickling or grit blasting might disclose surface imperfections not readily visible prior to this operation.4 ISO 2014 All righ

42、ts reserved ISO 4995:2014(E) 5.8 Oiling As a deterrent to rusting, a coating of oil is usually applied to hot-rolled descaled steel sheet, but sheet may be furnished not oiled, if required. The oil is not intended as a forming lubricant and shall be easily removed using degreasing chemicals. On requ

43、est, the manufacturer shall advise the purchaser of the type of oil used. Hot-rolled descaled sheet may be ordered not oiled, if required, in which case the supplier has limited responsibility if oxidation occurs. 6 Dimensional and shape tolerances Dimensional and shape tolerances applicable to hot-

44、rolled steel sheet of structural quality shall be as given in ISO 16160. These tolerances also apply to descaled material. Tolerances on coiled material with thicknesses over 6 mm shall be as given in ISO 13976. 7 Tensile test sampling One representative sample for the tensile test required in Table

45、 4 shall be taken from each lot of sheet for shipment. 8 Tensile test The tensile test shall be carried out in accordance with ISO 6892-1. Transverse test pieces shall be taken midway between the centre and edge of the sheet as rolled. 9 Retests 9.1 Machining and fla w s If any test piece shows defe

46、ctive machining or develops flaws, it shall be discarded and another test piece shall be substituted. 9.2 Elongation If the percentage elongation of any test piece is less than that specified in Table 4, and if any part of the fracture is outside the middle half of the gauge length as scribed before

47、 the test, the test shall be discarded and a retest shall be carried out. 9.3 Additional tests If a test does not give the specified results, two additional tests shall be carried out at random on the same lot. Both tests shall conform to the requirements of this International Standard; otherwise th

48、e lot shall be rejected. 10 Resubmission 10.1 The manufacturer may resubmit, for acceptance, the products that have been rejected during earlier inspection because of unsatisfactory properties, after the rejected products have been subjected to a suitable treatment (for example: selection, heat trea

49、tment, etc.) which, on request, will be indicated to the purchaser. In this case, tests shall be carried out as if they are applied to a new lot. 10.2 The manufacturer has the right to present the rejected products for fresh examination for compliance with the requirements for another grade. ISO 2014 All rights reserved 5 ISO 4995:2014(E) 11 Workmanship 11.1 The surface condition shall be that normally obtained in a hot-rolled or hot-rolled descaled product. 11.2 The steel sheet in cut lengths shall be free from quantities of laminat