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1、 Reference number ISO 6316:2008(E) ISO 2008 INTERNATIONAL STANDARD ISO 6316 Fourth edition 2008-06-01 Hot-rolled steel strip of structural quality Feuillards lamins chaud en acier de construction Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee
2、=Boeing Co/5910770001 Not for Resale, 07/25/2008 02:40:05 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 6316:2008(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall n
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7、 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2008 All rights reserved Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 07/25/2008 02:40:05 MDTNo reproduction or networking permitt
8、ed without license from IHS -,-,- ISO 6316:2008(E) ISO 2008 All rights reserved iii 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 thro
9、ugh 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, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collabor
10、ates closely with the International Electrotechnical 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 Standa
11、rds. Draft International Standards adopted 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 t
12、his document may be the subject of patent rights. ISO shall not be held responsible 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 fourth edition cancels and replaces the thi
13、rd edition (ISO 6316:2000), which has been technically revised. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 07/25/2008 02:40:05 MDTNo reproduction or networking permitted without license from IHS -,-,-
14、Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 07/25/2008 02:40:05 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISO 6316:2008(E) ISO 2008 All rights rese
15、rved 1 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 microalloying elements. This product is intended for structural
16、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 product is commonly produced in thicknesses from 0,65 mm to 12 mm inclusive a
17、nd widths up to 600 mm exclusive, in coils and cut lengths. 1.3 This International Standard does not cover steels designated as commercial quality or drawing quality (covered in ISO 6317, Hot-rolled carbon steel strip of commercial and drawing qualities) or steels intended for boilers or pressure ve
18、ssels, or steels to be rerolled to cold-reduced products, or steels designated as weathering steels, having increased atmospheric corrosion resistance. 1.4 Hot-rolled steel strip can also be rolled on a wide continuous mill and slit into narrower coils. However, all attributes of the finished produc
19、t meet the requirements of this International Standard. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (inclu
20、ding any amendments) applies. 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 Terms and definitions For the purposes of this document, the following terms and definitions apply.
21、3.1 microalloying elements 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
22、 strip product obtained 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 The product has a surface covered with oxide or scale resulting from the hot-rolling operation. Cop
23、yright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 07/25/2008 02:40:05 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 6316:2008(E) 2 ISO 2008 All rights reserved 3.3 hot-rolled desc
24、aled 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 Descaling may also be performed by mechanical means such as grit blasting. Some increase in hardness and some loss of ductility can result from descaling
25、. NOTE 2 This product is normally supplied oiled. 3.4 mill edge normal side edge without any definite contour produced in hot rolling NOTE 1 Mill edges may contain some irregularities, such as cracked or torn edges or thin (leathered) edges. NOTE 2 A square mill edge can be produced by hot-edge roll
26、ing (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 Normal processing does not necessarily provide a definitive positioning of the slitting burr. 4 Conditions of manufacture 4.1 Steelmaking The pr
27、ocesses used in steelmaking and in manufacturing hot-rolled strip are left to the discretion of the manufacturer. On request, the purchaser shall be informed of the steelmaking process being used. 4.2 Chemical composition The chemical composition (heat analysis) shall be as agreed upon between the i
28、nterested parties at the 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,b Method of deoxidation c, d C max. Mn max. Si max. P max
29、. S max. HR235 B D E or NE CS 0,18 0,17 1,20 1,20 Not applicable 0,25 0,035 0,035 0,035 0,035 HR275 B D E or NE CS 0,21 0,20 1,20 1,20 Not applicable 0,25 0,035 0,035 0,035 0,035 HR355 B D NE CS 0,21 0,20 1,60 0, 55 0,035 0,035 0,035 0,035 a Class B steels are intended for use in welded structures o
30、r structural parts subjected to normal loading conditions. b Class 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 necessary. c E = rimming; NE = non-rimming; C
31、S = aluminum killed. d The mass fraction of nitrogen is controlled; normally it should not exceed 0,009 % for E or NE steel or 0,015 % for CS steel. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 07/25/200
32、8 02:40:05 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 6316:2008(E) ISO 2008 All rights reserved 3 Table 2 Limits on additional chemical elements Mass fractions in percent Elements Heat analysis max. Product analysis max. Cu a 0,20 0,23 Ni a 0,20 0,23 Cr a, b 0,15 0
33、,19 Mo a, b 0,06 0,07 Nb c 0,008 0,018 V c 0,008 0,018 Ti c 0,008 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 is/are specified, the sum does not apply; in which case, only the individual limits on the remaini
34、ng elements apply. b The 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. c Analysis greater than 0,008 % may be supplied af
35、ter agreement between the producer and purchaser. 4.3 Chemical analysis 4.3.1 Heat analysis A heat 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 analysis shall be reported
36、 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. 4.3.2 Product analysis A product analysis may be made by the purchaser to
37、verify the specified analysis of the semi-finished or finished steel and shall take into consideration any normal heterogeneity. Non-killed steels (such as rimmed or capped steels) are not technologically suitable for verification analysis. For killed steels, the sampling method and deviation limits
38、 shall be agreed upon between the manufacturer and purchaser at the time of ordering. The product analysis tolerances shall be in accordance with Table 3. 4.4 Weldability This product is normally suitable for welding if appropriate welding conditions are selected. For undescaled steel, it may be nec
39、essary to remove the scale or oxide, depending upon the welding method. As the mass fraction of carbon increases above 0,15 %, spot welding becomes increasingly difficult. 4.5 Application Hot-rolled steel strip should be identified for fabrication by the name of the part or by the intended applicati
40、on, which shall be compatible with the grade and class specified. 4.6 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 pieces obtained in accordance with the requirements of Clau
41、se 6. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 07/25/2008 02:40:05 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 6316:2008(E) 4 ISO 2008 All rights reserved 4.7 Surfac
42、e 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 disclose surface imperfections not readily visible prior to this operation. Also, after drawing, imperfections may be visi
43、ble which were not apparent in the flat strip. 4.8 Oiling As a deterrent to rusting, a coating of oil is usually applied to the descaled product. The oil is not intended as a drawing or forming lubricant and shall be easily removable with degreasing chemicals. The product may be ordered not oiled if
44、 required, in which case, the supplier has limited responsibility if oxidation occurs. Table 3 Product analysis tolerances Element Maximum of specified element % Tolerance over maximum specified % Carbon 0,15 to u 0,40 0,04 Manganese 1,15 to u 1,65 0,05 Silicon 0,30 to u 0,60 0,05 Phosphorus u 0,04
45、0,01 Sulfur u 0,04 0,01 NOTE The above maximum tolerance is the allowable excess over the specified requirements, and not the heat analysis. Table 4 Mechanical properties A % min. b, c Re min. a Rm min. (for information only) e 50 u 100 1,2 100 u 200 1,6 200 u 400 2 400 3 u 100 0,3 0,4 100 u 200 0,5
46、 0,6 200 u 400 0,7 0,8 400 1 500 u 3 000 30 0 3 000 u 6 000 40 0 6 000 u 9 000 65 0 9 000 u 12 000 85 0 12 000 100 0 NOTE For resquared material, more restrictive tolerances are subject to negotiation. Table 10 Camber tolerances for hot-rolled steel strip (including descaled strip) Values in millime
47、tres Form Camber tolerance a, b Coils and cut lengths 20 for widths 10 but u 40 in any 2 000 length 10 for widths 40 but 600 in any 2 000 length a In those cases where it is not practical to measure the tolerance as given in this table, the following formula may be used 2 2 (Non-standardIength)Toler
48、ance in Table10 New tolerance (Standardlength) = b The values do not apply to the uncropped ends of a mill-edge coil within 7 m inclusive of either side. NOTE Camber is the greatest deviation of a side edge from a straight line, the measurement being taken on the concave side with a straight edge. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 07/25/2008 02:40:05 MDTNo reproduction or netwo