1、 ISO 2012 Hot-rolled steel strip of structural quality Feuillards lamins chaud en acier de construction INTERNATIONAL STANDARD ISO 6316 Fifth edition 2012-12-15 Reference number ISO 6316:2012(E) ISO 6316:2012(E)ii ISO 2012 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2012 All rights reserved
2、. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester.
3、 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 6316:2012(E) ISO 2012 All rights reserved iii Contents Page Foreword iv 1 Scope . 1 2 Normative references 1 3 T erms and definiti
4、ons . 1 4 Dimensions . 2 5 Conditions of manufacture 2 5.1 Steelmaking . 2 5.2 Chemical composition 2 5.3 Chemical analysis 3 5.4 Weldability 3 5.5 Application . 3 5.6 Mechanical properties 3 5.7 Surface condition 4 5.8 Oiling 4 6 Dimensional and shape tolerances . 5 7 Sampling 5 8 Test methods . 5
5、8.1 Tensile test 5 8.2 Impact 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 purchaser. 6 Bibliography .10 ISO 6316:20
6、12(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 member body interested in a subject for whi
7、ch 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 Electrotechnical Commission (IEC) on all m
8、atters 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 adopted by the technical committees are cir
9、culated 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 patent rights. ISO shall not be held respon
10、sible for identifying any or all such patent rights. ISO 6316 was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 12, Continuous mill flat rolled products. This fifth edition cancels and replaces the fourth edition ( ISO 6316:2008), which has been technically revised.iv ISO 2012 Al
11、l rights reserved INTERNATIONAL ST ANDARD ISO 6316:2012(E) Hot-rolled steel strip of structural quality 1 Scope 1.1 This International Standard specifies requirements for hot-rolled steel strip of structural quality in the grades and classes listed in Table 1, usually without the use of microalloyin
12、g elements. This product is intended 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. It is commonly rolled on a narrow strip mill. 1.2 This International Standard do
13、es not cover steels designated as commercial quality or drawing quality (covered in ISO 6317) or steels intended for boilers or pressure vessels, or steels to be rerolled to cold-reduced products, or steels designated as weathering steels, having increased atmospheric corrosion resistance. 2 Normati
14、ve 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 references, the latest edition of the reference document (including any amendments) app
15、lies. ISO 148-1, Metallic materials Charpy pendulum impact test Part 1: Test method ISO 6892-1, Metallic materials Tensile testing Part 1: Method of test at room temperature 3 T erms an d definiti ons For the purposes of this document, the following terms and definitions apply. 3.1 microalloying ele
16、ments elements, such as niobium, vanadium, titanium, etc., added singly or in combination to obtain higher strength levels combined with better formability, weldability and toughness as compared with non- alloyed steel produced with equivalent strength levels 3.2 hot-rolled steel strip product obtai
17、ned by rolling heated steel (billet or slab) through a continuous-type mill to the required strip thickness, tolerances and other attributes set in this International Standard Note 1 to entry: The product has a surface covered with oxide or scale resulting from the hot-rolling operation. 3.3 hot-rol
18、led descaled steel strip hot-rolled steel strip from the surface of 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 means such as grit blasting. Some increase in hardness and some loss of ductility can res
19、ult from descaling. Note 2 to entry: This product is normally supplied oiled. ISO 2012 All rights reserved 1 ISO 6316:2012(E) 3.4 mill edge normal side edge without any definite contour produced in hot rolling Note 1 to entry: Mill edges may contain some irregularities, such as cracked or torn edges
20、 or thin (leathered) edges. Note 2 to entry: A square mill edge can be produced by hot-edge rolling (with the corners not as square as a square-edge bar). 3.5 sheared edge normal edge obtained by shearing, slitting or trimming a mill edge product Note 1 to entry: Normal processing does not necessari
21、ly provide a definitive positioning of the slitting burr. 4 Dimensions 4.1 This product shall be produced in thicknesses from 0,65 mm to 12 mm inclusive and widths up to 600 mm exclusive, in coils and cut lengths. 4.2 Hot-rolled steel strip can also be rolled on a wide continuous mill and slit into
22、narrower coils. However, all attributes of the finished product shall meet the requirements of this International Standard. 5 Conditions of manufacture 5.1 Steelmaking Unless otherwise agreed by the interested parties, the processes used in steelmaking and in manufacturing hot-rolled strip are left
23、to the discretion of the manufacturer. On request, the purchaser shall be informed of the steelmaking process being used. 5.2 Chemical composition Unless otherwise agreed by the interested parties, the chemical composition (heat analysis) shall be as agreed upon between the interested parties at the
24、 time of ordering. The ranges or limits shall be in accordance with the requirements of Tables 1 and 2 for the designation specified. Table 1 Chemical composition (heat analysis) Mass fractions in percent Grade Class a Method of deoxidation b,c C max. Mn max. Si max. P max. S max. HR235 D CS 0,17 1,
25、20 0,25 0,035 0,035 HR275 D CS 0,20 1,20 0,25 0,035 0,035 HR355 D CS 0,20 1,60 0, 55 0,035 0,035 aClass D steels are intended for use in welded structures or structural parts where, owing to loading conditions and the general design of the structure, a high resistance to brittle fracture is necessar
26、y. bCS = aluminum killed. cThe mass fraction of nitrogen is controlled; normally it should not exceed 0,015 % for CS steel.2 ISO 2012 All rights reserved ISO 6316:2012(E) Table 2 Limits on additional chemical elements Mass fractions in percent Elements Heat analysis max. Product analysis max. Cu a 0
27、,20 0,23 Ni a 0,20 0,23 Cr ab 0,15 0,19 Mo ab 0,06 0,07 Nb c 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 is/are specified, the sum does not apply; in which case, only the
28、 individual limits on the remaining elements apply. bThe sum of chromium and molybdenum shall not exceed 0,16 % on heat analysis. When one or more of these elements is/are specified, the sum does not apply; in which case, only the individual limits on the remaining elements apply. cAnalysis greater
29、than 0,008 % may be supplied after agreement between the producer and purchaser. 5.3 Chemical analysis 5.3.1 Heat analysis An analysis of each heat of steel shall be made by the manufacturer to determine compliance with the requirements of Tables 1 and 2. When requested at the time of ordering, this
30、 analysis shall be reported to the purchaser 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. 5.3.2 Product analysis A product analysis may b
31、e made by the purchaser to verify the specified analysis of the semi-finished or finished steel and shall take into consideration any normal heterogeneity. The product analysis tolerances shall be in accordance with Table 3. 5.4 Weldability This produce shall be capable of being welded where welding
32、 conditions are specified. For un-descaled steel, it may be necessary to remove the scale or oxide, depending upon the welding method. NOTE As the carbon content increases above 0,15 %, spot welding becomes increasingly difficult. 5.5 Application Hot-rolled steel strip should be identified for fabri
33、cation by the name of the part or by the intended application, which shall be compatible with the grade and class specified. 5.6 Mechanical properties At the time that the steel is made available for shipment, the mechanical properties shall be as stated in Table 4, when they are determined on test
34、pieces obtained in accordance with the requirements of Clause 6. ISO 2012 All rights reserved 3 ISO 6316:2012(E) 5.7 Surface condition Oxide or scale on hot-rolled steel strip is subject to variations in thickness, adherence and colour. Removal of the oxide or scale by pickling or blast cleaning may
35、 disclose surface imperfections not readily visible prior to this operation. Also, after drawing, imperfections may be visible which were not apparent in the flat strip. 5.8 Oiling As a deterrent to rusting, a coating of oil may be applied to the product. Any oil shall not be intended as a drawing o
36、r forming lubricant and shall be easily removed using degreasing chemicals. On request, the manufacturer shall advise the purchaser which type of oil has been used. The product may be ordered not oiled, if required, in which case the supplier shall have limited responsibility if oxidation occurs. Ta
37、ble 3 Product analysis tolerances Mass fractions in percent Element M a x i mu m of s p e c i f ie d e l e me n t Tolerance over maximum speci- f ie d Carbon 0,15 to 0,20 0,04 Manganese 1,15 to 1,60 0,05 Silicon 0,30 to 0,55 0,05 Phosphorus 0,035 0,01 Sulfur 0,035 0,01NOTE The above maximum toleranc
38、e is the allowable excess over the specified requirements, and not the heat analysis. Table 4 Mechanical properties Grade R emin. a R mmin. (for information only) A % min. bc e 3 3 e 6 MPa MPa L o= 50 mm L o= 80 mm L o= 5,65 S o L o= 50 mm HR235 235 330 20 18 23 22 HR275 275 370 17 15 20 18 HR355 35
39、5 450 15 13 19 16 R eyield strength R mtensile strength A percentage elongation after fracture L ogauge length of original test piece S ooriginal cross-sectional area of gauge length e thickness of steel sheet, in millimetres 1 MPa = 1 N/mm 2 aThe yield strength can be measured either by 0,5 % total
40、 elongation proof stress R t0,5(proof stress under load) or by 0,2 % offset R p0,2when a definite yield phenomenon is not present. bFor 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 either L o= 5,65 S oor L o= 50 mm. In case of dispute, however, on
41、ly the results obtained on a proportional test piece will be valid for material 3 mm and over in thickness. cFor material over 6 mm in thickness, values for elongation are subject to agreement between the manufacturer and purchaser.4 ISO 2012 All rights reserved ISO 6316:2012(E) 6 Dimensional and sh
42、ape tolerances Dimensional and shape tolerances applicable to hot-rolled steel strip of structural quality shall be as given in Table 5 and Tables 7 to 10 inclusive. Restrictive thickness tolerances are given in Table 6. It has not been found practicable to formulate flatness and out-of-square toler
43、ances for hot-rolled steel strip. 7 Sampling One representative sample for the tensile test required in Table 4 shall be taken from each lot of strip for shipment. A lot consists of 50 t or less of strip of the same grade and class, rolled to the same thickness and condition. 8 Test methods 8.1 Tens
44、ile test The tensile test shall be carried out in accordance with ISO 6892-1. Longitudinal test pieces shall be taken at the 1/4 point (halfway between the edge and mid-width). 8.2 Impact test While not usually specified, if so agreed at the time of ordering, impact tests may be specified for materi
45、al over 6 mm in thickness. The test piece shall be in the longitudinal direction and the test shall be a Charpy V-notch test carried out in accordance with ISO 148-1. 9 Retests 9.1 Machining and fla w s If any test piece shows defective machining or develops flaws, it shall be discarded and another
46、test piece substituted. 9.2 Elongation If the percentage elongation of any test piece is less than that specified in Table 4, or if any part of the fracture is outside the middle half of the gauge length as scribed before the test, the test shall be discarded and a retest shall be carried out. 9.3 A
47、dditional 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 may be rejected. 10 Resubmission The manufacturer may resubmit, for acceptan
48、ce, the products that have been rejected during earlier inspection because of unsatisfactory properties, after they have been subjected to a suitable retreatment (e.g. selection, heat treatment) which, on request, will be indicated to the purchaser. In this case, the tests shall be carried out as if
49、 they applied to a new batch. ISO 2012 All rights reserved 5 ISO 6316:2012(E) 11 Workmanship The surface condit ion shall be t hat normally obt ained on a hot-rolled produc t or hot-rolled descaled produc t . The steel strip in cut lengths shall be free from laminations, surface flaws and other imperfections that are detrimental to subsequent appropriate processing. Processing for shipment in coils does not afford the manufacturer the opportunity to observe readily or to remove imperfect portions as can be carried out on th
