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1、BRITISH STANDARD BS ISO 20805:2005 Hot-rolled steel sheet in coils of higher yield strength with improved formability and heavy thickness for cold forming ICS 77.140.50 ? Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 07:26:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 20805:2005 This
2、 British Standard was published under the authority of the Standards Policy and Strategy Committee on 16 February 2005 BSI 16 February 2005 ISBN 0 580 45479 7 National foreword This British Standard reproduces verbatim ISO 20805:2005 and implements it as the UK national standard. The UK participatio
3、n in its preparation was entrusted to Technical Committee ISE/10, Flat rolled steels products, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publ
4、ications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the ne
5、cessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the in
6、terpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii and iii, a blank page, pages 1
7、 to 9 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 07:26:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI INTERNATIONAL
8、STANDARD ISO 20805 First edition 2005-02-15 Reference number ISO 20805:2005(E) OSI 2005 Hot-rolled steel sheet in coils of higher yield strength with improved formability and heavy thickness for cold forming Tles fortes en acier lamines chaud limite dlasticit et aptitude au formage accues, en bobine
9、s, pour formage froid BS ISO 20805:2005 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 07:26:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO :50802(5002)E ii ISO 5002 All rithgs reresvde id FDPscalimer ThFDP si fam eliy ctnome niat deddebyepfa.sec In cacnadrociw eth sebodA sneciliycilop gn
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14、x + 22 14 0 9479 74 Eam-il ocpyrithgios.ogr Web wwwi.soo.rg Pubni dehsil Stiwrezldna BS ISO 20805:2005 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 07:26:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 08025002:5)E( ISO 5002 r llAithgs reservde iii Foreword ISO (the International Organiz
15、ation 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 which a technical committee has been established
16、 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 matters of electrotechnical standardization. I
17、nternational 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 circulated to the member bodies for voting. Publ
18、ication 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 responsible for identifying any or all such patent
19、rights. ISO 20805 was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 12, Continuous mill flat rolled products. BS ISO 20805:2005 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 07:26:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank 5002:50802 OSI SB Licensed Copy: sheffi
20、eldun sheffieldun, na, Mon Nov 27 07:26:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ANRETNIITOTS LANDNADRAISO 08025002:5)E( ISO 5002 r llAithgs reservde 1 Hot-rolled steel sheet in coils of higher yield strength with improved formability and heavy thickness for cold forming 1Scope 1.1This Internat
21、ional Standard applies to continuous hot-rolled steel sheet of higher yield strength with improved formability. The steel is killed, made according to a fine-grain practice and has a suitable chemical composition, which shall include microalloying elements, to provide improved formability. The steel
22、 may be treated to achieve inclusion control. The product is intended for applications where parts are to be fabricated requiring better formability than is provided by normal high-yield-strength steel sheet. It is generally used in the as-delivered condition. This product is commonly produced on a
23、wide strip mill. Because of the combination of higher strength and improved formability, it is possible to obtain savings in mass along with better weldability (see 4.4). 1.2This product is commonly produced in the range of thicknesses greater than to , and widths of and over, in coils. 1.3This Inte
24、rnational Standard does not cover steels intended for boilers or pressure vessels, or steels designated as commercial quality, drawing quality or structural quality, or steels rolled to cold-reduced products, or steels designated as weathering steels, having increased atmospheric corrosion resistanc
25、e, or those products rolled on a plate mill. 2Normative 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 (including any ame
26、ndments) applies. ISO 148:1983, Steel Charpy impact test (V-notch) ISO 6892:1998, Metallic materials Tensile testing at ambient temperature 3Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 microalloying elements elements, such as niobium, vanad
27、ium, 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 to equivalent strength levels 3.2 hot-rolled steel sheet in coils product obtained by rolling heated steel (bil
28、let or slab) through a continuous-type mill to the required strip thickness and tolerances NOTEThe product has a surface covered with oxide or scale resulting from the hot-rolling operation. 6 mm25 mm 600 mm BS ISO 20805:2005 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 07:26:42 GMT+00:00
29、2006, Uncontrolled Copy, (c) BSI ISO :50802(5002)E 2 ISO 5002 All rithgs reresvde 3.3 hot-rolled descaled steel sheet in coils hot-rolled steel sheet from the surface of which oxide or scale has been removed, commonly by pickling in an acid solution NOTEDescaling may also be performed by mechanical
30、means such as grit blasting. Some increase in hardness and some loss of ductility may result from descaling. 3.4 mill edge a normal edge produced without any definite contour produced in hot-rolling. NOTEMill edges may contain some irregularities such as cracked or torn edges or thin (feathered) edg
31、es. 3.5 sheared edge a normal edge obtained by shearing, slitting or trimming a mill edge product NOTENormal processing does not necessarily provide a definite positioning of the slitting burr. 4Conditions of manufacture 4.1Steelmaking Unless otherwise agreed upon by the interested parties, the proc
32、esses used 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. 4.2Chemical composition 4.2.1The chemical composition (heat analysis) shall conform to the requireme
33、nts in Tables 1 and 2. 4.2.2The steel covered by this International Standard shall contain microalloying elements. The chemical composition may be agreed between the interested parties at the time of enquiry and ordering. Table 1 Chemical analysis (heat analysis) All grades CarbonManganesePhosphorus
34、Sulfur 0,15 max., %1,65 max., %0,025 max., %0,030 max., % NOTE 1As the form of sulfide inclusions may have a certain influence on the cold forming properties of the products, the manufacturers may, at their discretion, influence the form of inclusions by adding certain elements, such as Ce or Ca, or
35、 may choose a very low sulfur content for these steels. NOTE 2These steels shall also contain one or more of the following elements: vanadium, titanium or niobium. Other alloying elements may be present, but are not required. Table 2 Limits on additional chemical elements Copper, max. %Heat analysis
36、0,20 Product analysis0,23 Nickel, max. %Heat analysis0,20 Product analysis0,23 Chromium, max. %Heat analysis0,15 Product analysis0,19 Molybdenum, max. %Heat analysis0,06 Product analysis0,07 BS ISO 20805:2005 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 07:26:42 GMT+00:00 2006, Uncontrolle
37、d Copy, (c) BSI ISO 08025002:5)E( ISO 5002 r llAithgs reservde 3 4.3Chemical analysis 4.3.1Heat analysis A heat analysis of each heat of steel shall be made by the manufacturer to determine the percentage of carbon, manganese, phosphorus and sulphur, and the contents of other elements giving the spe
38、cified mechanical strength and formability. On request, this analysis shall be reported to the purchaser or his representative. 4.3.2Product analysis A product analysis may be made by the purchaser to verify the specified analysis of the product and shall take into consideration any normal heterogen
39、eity. Non-killed steels (such as rimmed or capped) are not technologically suited to product analysis. For killed steels, 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 3. 4.4Weldabili
40、ty This product is normally suitable for welding if appropriate welding conditions are selected. For undescaled steel, it may be necessary to remove the scale or oxide depending upon the welding method. As the carbon content increases above , spot welding becomes increasingly difficult. 4.5Applicati
41、on It is desirable that hot-rolled steel sheet be identified 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. 4.6Mechanical properties At the time that the steel
42、 is made available for shipment, the mechanical properties shall be as stated in Table 4, when they are determined on test pieces in accordance with the requirements of Clause 6. Any additional property requirements specified or required are subject to agreement between the interested parties at the
43、 time of enquiry and ordering. Such additional requirements may include characterization or prescribed values for properties such as impact for sheet over in thickness (see 7.2). Table 3 Product analysis tolerances ElementMaximum of specified element,Tolerance over maximum specified, Carbon0,03 Mang
44、anese to 0,05 Phosphorus0,010 Sulfur 0,010 NOTEThe above maximum tolerance is the allowable excess over the specified requirement and not the heat analysis. For example: for all grades in this standard the following product analysis values are within these tolerances: C, Mn, P, S. % ?0,15 1,15?1,65
45、?0,04 ?0,06 0,18 %1,70 %0,035 %0,040 % 0,15 % 6 mm BS ISO 20805:2005 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 07:26:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO :50802(5002)E 4 ISO 5002 All rithgs reresvde 4.7Surface condition Designation AR describes the as-rolled condition. Oxid
46、e 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 blast cleaning may disclose surface imperfections not readily visible prior to this operation. The steel shall be supplied as-rolled or pickled and oiled, as
47、 requested by the purchaser at the time of enquiry and ordering (see 3.3). If neither condition is specified, the delivery will be as-rolled. 4.8Oiling Designation DO describes the descaled and oiled condition. As a deterrent to rusting, a coating of oil is usually applied to hot-rolled descaled ste
48、el sheet. The oil is not intended as a drawing or forming lubricant and shall be easily removable with degreasing chemicals. On request, the manufacturer shall advise the purchaser which type of oil has been used. Hot-rolled descaled steel sheet may be ordered not oiled, if required, in which case t
49、he supplier has limited responsibility if oxidation occurs. 5Dimensional tolerances 5.1Dimensional tolerances applicable to hot-rolled steel sheet in coils of structural quality and heavy thickness shall be in accordance with Tables 5 and 6. These tolerances also apply to descaled material. Table 4 Mechanical properties Grade b min., % min.amin. for sheet thickness 32532541019212426 35535542018202325 42042048015171921 49049054012131617 5605606109101213 is the yield s
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