1、BRITISH STANDARD BS 1449-1.8: 1991 Steel plate, sheet and strip Part 1: Carbon and carbon-manganese plate, sheet and strip Section 1.8 Specification for hot rolled narrow strip based on formabilityBS1449-1.8:1991 This British Standard, having been prepared under the direction of the Iron and Steel S
2、tandards Policy Committee, was published under the authority of the Standards Board and comes into effect on 31 October 1991 BSI 12-1998 The following BSI references relate to the work on this standard: Committee references ISM/10 Draft announced in BSI News, August 1991 ISBN 0 580 19877 4 Committee
3、s responsible for this British Standard The preparation of this British Standard was entrusted by the Iron and Steel Standards Policy Committee (ISM/-) to Technical Committee ISM/10, upon which the following bodies were represented: British Railways Board British Steel Industry Cold Rolled Sections
4、Association Society of Motor Manufacturers and Traders Limited The following bodies were also represented in the drafting of the standard, through subcommittees and panels: British Welded Steel Tube Association Institution of Mechanical Engineers National Association of Steel Stockholders Amendments
5、 issued since publication Amd. No. Date CommentsBS1449-1.8:1991 BSI 12-1998 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Information to be supplied by the purchaser 1 4 Chemical composition 1 5 Mechanical properties 2 6 Condition of material on de
6、livery 3 Appendix A Manipulation 4 Table 1 Chemical composition 2 Table 2 Mechanical properties 2 Table 3 Conditions and surface finishes 3 Publications referred to Inside back coverBS1449-1.8:1991 ii BSI 12-1998 Foreword This Section of BS 1449 has been prepared under the direction of the Iron and
7、Steel Standards Policy Committee. It is a new edition of the element of BS1449-1:1983 covering hot rolled narrow strip based on formability. This Section of BSI 1449, together with BS1449-1.1 to BS1449-1.7 andBS1449-1.9 to BS1449-1.15 and BSEN10130, supersedes BS1449-1:1983 which is withdrawn. The r
8、equirements specified are technically identical to those applicable to hot rolled narrow strip in section 2 of BS1449-1:1983. This Section of BS1449 will be withdrawn when EU46 “Hot rolled strip ( # 600mm wide) mild unalloyed steel for cold forming. Quality specification” becomes a European Standard
9、 and is published as a British Standard. For further explanation of this change in presentation see the foreword to BS1449-1.1:1991. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Co
10、mpliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may
11、have had amendments incorporated. This will be indicated in the amendment table on theinside front cover.BS1449-1.8:1991 BSI 12-1998 1 1 Scope This Section of BS 1449 specifies low carbon (0.20%maximum) hot rolled narrow strip, intended for applications where formability is a major requirement. NOTE
12、 1The combination of conditions and surface finishes, related to narrow mill products, for this type of material are given in note 4 to6.1. NOTE 2Information on the manipulation of steels complying with this Section of BS1449 is given in appendixA. NOTE 3The titles of the publications referred to in
13、 this standard are listed on the inside back cover. 2 Definitions For the purposes of this Section of BS1449, the definitions given in BS1449-1.1 apply. 3 Information to be supplied by the purchaser 3.1 General The following information shall be given on the enquiry and order. NOTEPurchasers should
14、pay particular attention to the various options available in this standard and included in the list below. Where no specific choice is made by the purchaser, the supplier shall select what is appropriate, except that for items a), b), c) and d) reference back to the purchaser shall be made: a) the n
15、umber of this British Standard, i.e. BS1449-1.8; b) the form of product required, i.e. hot rolled narrow strip; c) the nominal dimensions (see BS 1449-1.12) and quantity of the product required; d) the condition, grade and surface finish of the material (see3.4 and6.1); e) if the material is to be s
16、upplied as “SUITABLE FOR MAKING THE PART” (see3.2 and3.3); f) the edge condition required (see clause18 of BS1449-1.1:1991); g) the application for which the material is intended, including the submission of a drawing; h) whether proof of freedom from strain-age-embrittlement for grades 2, 3 or 4 (s
17、ee6.3) is required; i) if the material is to be welded, the welding method to be used (see6.2); j) whether test certificates are required for cast analysis (see5.1 of BS1449-1.1:1991) and/or mechanical properties (see clause 8 of BS1449-1.1:1991 and clause5); k) whether the purchaser wishes to carry
18、 out inspection at the manufacturers works (seeclause19 of BS1449-1.1:1991); l) whether oiling or other protective coating is required (seeclause7 of BS1449-1.1:1991); m) any limitations on masses and dimensions of individual coils or bundles if applicable; n) details of any special requirements, e.
19、g. agreed tests for drawability (seeclause13 of BS1449-1.1:1991); o) whether special requirements are necessary for packaging or marking (seeclause21 of BS1449-1.1:1991). 3.2 Suitability for making the part NOTEFormability requirements vary widely and it is advisable with the steels in this Section
20、of BS1449 to seek the advice of the supplier and, if possible, to purchase material on the understanding that it will be suitable for a particular application and/or purpose. Item e) of 3.1 is included to cover such a case. When, following an enquiry, the supplier undertakes to supply steel which is
21、 suitable for forming into a particular part, the purchaser, when ordering the steel, shall add the words “SUITABLE FOR MAKING THE PART” after the grade selected. In such cases, the steel supplied shall not be subject to rejection if there are minor variations from the chemical composition and/or me
22、chanical properties specified for that steel. 3.3 Grade specified by the purchaser Where a purchaser specifies a particular grade and3.2 is not invoked, then it shall be the purchasers responsibility to ensure that the grade is satisfactory for his requirements. 3.4 Grade and condition by consultati
23、on Where a purchaser is unqualified to select a particular material in terms of grade and condition, it shall be sufficient for him to specify the requirements in items a), b) and c) of 3.1. It shall then be the responsibility of the supplier, in consultation with the purchaser, to select and supply
24、 a grade and condition of material which is satisfactory for the purchasers requirements. The purchaser shall select a particular surface finish of material in accordance with note 3 to 6.1 if so required. 4 Chemical composition The chemical composition of the materials shall be as given inTable 1.
25、Material HS1 shall be an aluminium-killed steel. Unless otherwise agreed at the time of ordering, the deoxidation condition of all other grades shall be at the discretion of the manufacturer.BS1449-1.8:1991 2 BSI 12-1998 5 Mechanical properties The mechanical properties of the materials at the time
26、of despatch shall be as given inTable 2. NOTEAll the steels included inTable 1 and Table 2 may strain-age harden (see note to clause6) and the ductility will therefore deteriorate. Table 1 Chemical composition Table 2 Mechanical properties Rolled condition and grade ab Quality C max. Mn max. S max.
27、P max. % % % % HS1 Extra deep drawing aluminium-killed steel 0.08 0.45 0.030 0.025 HS2 Extra deep drawing 0.08 0.45 0.035 0.030 HS3 Deep drawing 0.10 0.50 0.040 0.040 HS4 c Drawing or forming 0.12 0.60 0.050 0.050 HS14 Flanging 0.15 0.60 0.050 0.050 HS15 Commercial 0.20 0.90 0.050 0.060 NOTEFor impr
28、oved atmospheric corrosion resistance, material can be supplied with a specified copper content by special agreement between the manufacturer and the purchaser. a Steels that have received a decarburizing treatment are not supplied against these grades unless previously agreed between the manufactur
29、er and purchaser. b Steels in this Section of BS1449 may not be suitable for case-hardening (see grade10 in BS1449-1.14). c See also BS1449-1.14. Rolled condition and grade Yield strength R e , min. Tensile strength R m , min. Elongation A, min. Bend mandrel diameter (180 bend) Original gauge length
30、 L0 50 mm 80 mm c a 3 mm 3 mm $ $ a 10 mm a $ $ 10 mm N/mm 2 N/mm 2 % % HS1 HS2 170 290 34 (32) 0a 0a HS3 (170) (290) (28) (26) 0a 0a HS4 HS14 (170) (280) (25) (23) 1a 2a 3a HS15 (170) (280) 2a 3a 4a NOTEa is the thickness of the bend test piece. a The mechanical properties shown correspond to mater
31、ial in the despatched condition only. The strength will increase with cold forming. Tensile properties given in brackets are for guidance only and are not mandatory unless specially agreed at the time of ordering. Tensile test results are not normally requested for grades 3, 4, 14 and 15. b For mate
32、rial of less than 2.5mm thickness, the percentage elongation is reduced by 1 for each 0.25mm reduction in thickness. c The 80mm gauge length is currently not used in the UK but, as a step towards conforming with European practice, tentative values have been included.BS1449-1.8:1991 BSI 12-1998 3 6 C
33、ondition of material on delivery NOTEStrain-ageing. Rimmed steel, as normally produced, strain-ages when supplied in the skin passed condition and this may lead to: a) increase in hardness; b) stretcher strain markings (Lders lines) when the material is formed; c) deterioration in ductility. Because
34、 of these factors, it is essential that the period between final processing at the mill and fabrication be kept to the minimum. Rotation of stock by using the oldest material first is important. Stocking of these skin passed steels for extended periods of time should be avoided and, for optimum perf
35、ormance, should not exceed 6weeks. Reasonable freedom from stretcher strain can be achieved in skin passed material by effective roller levelling immediately prior to pressing at the customers plant. Complete freedom from stretcher strain and also freedom from deterioration in ductility, due to stra
36、in-age-hardening, is achieved by the supply of skin passed stabilized steels as established by the test in B.4 of BS1449-1.1:1991. 6.1 Designation The condition and finish of the material shall be in accordance with the symbols included with the material grade, and shall be given on the enquiry and
37、order (seeclause3). The symbols denoting material condition (seeTable1 of BS1449-1.1:1991), if required, shall be given before the grade number of the steel, in the following order: a) the symbol R, B or K signifying the type of steel; b) the symbols HS signifying the method of rolling; c) the symbo
38、l A if the material is required in the annealed condition. NOTE 1Attention is drawn to the fact that it is not obligatory for the purchaser of a fabricated component to specify the manufacturing method for the flat rolled material. Symbols denoting surface finish (see Table 2 of BS1449-1.1:1991) sha
39、ll appear after the grade number of the steel. NOTE 2Material condition. The following material condition is available; a more complete description is given in Table1 of BS1449-1.1:1991. A Annealed NOTE 3Surface finishes (see also clause17 of BS1449-1.1:1991). The following are available for materia
40、l rolled on narrow mills (HS); more complete descriptions are given in Table2 of BS1449-1.1:1991. P Pickled D Mechanically descaled NOTE 4Condition and surface finish combinations. The combinations of material condition and surface finishes that are available in addition to the as-rolled condition a
41、re indicated inTable 3. There may be some limitation on the thicknesses and widths available. 6.2 Weldability All grades shall be weldable by suitable resistance welding techniques (see also itemi) of3.1). NOTEExtra precautions should be exercised in the spot welding of grades 14 and 15. If fusion w
42、elding techniques are to be used, this shall be stated on the order. 6.3 Strain-age-embrittlement Grade 1 shall be free from strain-age-embrittlement (see clause 11 of BS1449-1.1:1991). Freedom from strain-age-embrittlement for other grades shall be by agreement between the manufacturer and the purc
43、haser (see item h) of3.1). Table 3 Conditions and surface finishes Material condition Surface finish of material P D HS X X HSSP X NOTEX indicates availability of finish.BS1449-1.8:1991 4 BSI 12-1998 Appendix A Manipulation Steels complying with this Section of BS1449 can be formed to 90 without hea
44、ting, providing that the following simple precautions are taken. a) The diameter of bending should be as generous as possible and always larger than those specified inTable 2. Care should be taken to ensure that the steel accurately follows the shape of the tool. Knife edges should be avoided. The b
45、end diameters specified inTable 2 are for specially prepared test pieces, and conditions during fabrication may be more severe and may not be simulated by conditions during laboratory testing. b) Bending of heavily cold-worked or flame-cut edges should be avoided. In particular, heavy shearing burr
46、should not be present. Burr produced during shearing or blanking should be on the inside of the bend. c) Where possible, the axis of the bend should be transverse to the direction of rolling of the steel.BS1449-1.8:1991 BSI 12-1998 Publication(s) referred to BS 1449, Steel plate, sheet and strip. BS
47、 1449-1.1, General specification. BS 1449-1.12, Specification for tolerances on dimensions and shape for hot rolled narrow strip. BS 1449-1.14, Specification for hot rolled narrow strip supplied in a range of conditions for heat treatment and general engineering purposes. EU 46, Hot rolled strip (#
48、600 mm wide) mild unalloyed steel for cold forming. Quality specification 1) . 1) Referred to in the foreword only.BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
49、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve th
