1、BRITISH STANDARD BS 1449-1.14: 1991 Steel plate, sheet and strip Part 1: Carbon and carbon-manganese plate, sheet and strip Section 1.14 Specification for hot rolled narrow strip supplied in a range of conditions for heat treatment and general engineering purposesBS1449-1.14:1991 This British Standa
2、rd, having been prepared under the direction of the Iron and Steel Standards 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 reference ISM/10 Dr
3、aft announced in BSI News August 1991 ISBN 0 580 19883 9 Committees 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: B
4、ritish Railways Board British Steel Industry Cold Rolled Sections 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 Mechanic
5、al Engineers National Association of Steel Stockholders Amendments issued since publication Amd. No. Date CommentsBS1449-1.14:1991 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 co
6、mposition 1 5 Mechanical properties 1 6 Condition of material on delivery 1 Table 1 Chemical composition 2 Table 2 Mechanical properties 3 Publication(s) referred to Inside back coverBS1449-1.14:1991 ii BSI 12-1998 Foreword This Section of BS1449 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 for heat treatment and general engineering purposes. This Section of BS1449, together with BS1449-1.1 to BS1449-1.13, BS1449-1.15 and BSEN10130, supersedes BS1449-1:1983 which is w
8、ithdrawn. The requirements specified are technically identical to those applicable to hot rolled narrow strip in section four of BS1449-1:1983. This Section of BS1449 will be withdrawn when the requirements specified become a European Standard and are published as a British Standard. For further exp
9、lanation 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. Compliance with a British Standard does not of itself conf
10、er immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 to 4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated
11、in the amendment table on theinside front cover.BS1449-1.14:1991 BSI 12-1998 1 1 Scope This Section of BS1449 specifies hot rolled, low, medium and high carbon steels, rolled in widths of less than 600mm. NOTEThe title of the publication referred to in this standard is listed on the inside back cove
12、r. 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 The following information shall be given on the enquiry and order. NOTEPurchasers should pay particular attention to the various options available in
13、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 number of this British Standard, i.e.BS1449-1.14; b) the form
14、of product required, strip or cut lengths (see 2.5 of BS1449-1.1:1991); c) the nominal dimensions and quantity of the product required; d) the type of steel (see note 1 to Table 1), grade, condition and surface finish of material required (see clause 6); e) the edge condition required (see clause 18
15、 of BS1449-1.1:1991); f) the application for which the product is intended, including the submission of a drawing; g) whether tensile and bend, or hardness and bend, requirements are to be met (see clause 5); h) whether details of cast analysis are required; i) whether the material is to be free fro
16、m strain-age-embrittlement (normally applicable to grades 4, 12, 17 and 22 only); j) whether test certificates are required for cast analysis and/or mechanical properties; k) whether the purchaser wishes to carry out inspection at the manufacturers works (seeclause 19 of BS1449-1.1:1991); l) whether
17、 oiling or any other protective coating is required (seeclause7 of BS1449-1.1:1991); m) details of special requirements such as decarburization limits (see 6.2) or grain size control; n) limitations on masses and dimensions of individual coils or bundles if applicable; o) whether special requirement
18、s are necessary for packaging or marking (seeclause21 of BS1449-1.1:1991); p) if a special heat treatment is to be used, specific information on the process should be given. 4 Chemical composition The chemical compositions of the materials shall be as given inTable 1. NOTEThe cast identity of grade
19、4 is not normally maintained. 5 Mechanical properties The mechanical properties of the materials shall be as given inTable 2. The material shall be supplied to comply with either the hardness and bend tests, or the tensile and bend tests, but in no case with both the hardness and tensile tests. 6 Co
20、ndition of material on delivery 6.1 Designation The condition and finish of the material shall be in accordance with the symbols included with the material grade and given on the enquiry/order (seeitemd) of clause3). The symbols denoting material condition, if required, shall be given before the gra
21、de number of the steel, in the following order: a) the symbols R (rimmed), B (balanced) or K(killed) signifying the type of steel: applicable only to material grades 4, 12, 17 and 22; b) the symbol HS (hot rolled narrow) signifying the method of rolling. If the material is required pickled, the symb
22、ol P shall appear after the grade number of the steel. NOTE 1Conditions of material. The following material conditions are available; more complete descriptions are given inTable 1 of BS1449-1.1:1991. HS Hot rolled on narrow strip mills N Normalized A Annealed NOTE 2Surface finish. The following sur
23、face finish is available; a more complete desciption is given inTable 2 of BS1449-1.1:1991. P Pickled finish 6.2 Decarburization NOTEDecarburization is not applicable to grades4,10,12,17,20 and 22. 6.2.1 Grades 30 and 40 When requested, the extent and nature of the normal slight decarburization shal
24、l be agreed between the manufacturer and purchaser.BS1449-1.14:1991 2 BSI 12-1998 6.2.2 Grades 50, 60, 70, 80 and 95 When specially requested, complete plus partial decarburization, as indicated by the proportion of ferrite, shall not extend to a depth below the surface greater than 3% of the nomina
25、l thickness of the material, at a distance of not less than 20mm from the edge. Table 1 Chemical composition Rolled condition and grade Type of steel C Si Mn S P min. max. min. max. min. max. max. max. % % % % % % % % HS4 Mild steel 0.12 0.60 0.050 0.050 HS10 Case hardening 0.08 0.15 0.10 0.35 0.60
26、0.90 0.045 0.045 HS12 “12” carbon 0.10 0.15 0.40 0.60 0.050 0.050 HS17 “17” carbon 0.15 0.20 0.40 0.60 0.050 0.050 HS20 “20” carbon 0.15 0.25 0.05 0.35 1.30 1.70 0.045 0.045 HS22 “22” carbon 0.20 0.25 0.40 0.60 0.050 0.050 HS30 “30” carbon 0.25 0.35 0.05 0.35 0.50 0.90 0.045 0.045 HS40 “40” carbon 0
27、.35 0.45 0.05 0.35 0.50 0.90 0.045 0.045 HS50 “50” carbon 0.45 0.55 0.05 0.35 0.50 0.90 0.045 0.045 HS60 “60” carbon 0.55 0.65 0.05 0.35 0.50 0.90 0.045 0.045 HS70 “70” carbon 0.65 0.75 0.05 0.35 0.50 0.90 0.045 0.045 HS80 “80” carbon 0.75 0.85 0.05 0.35 0.50 0.90 0.045 0.045 HS95 “95” carbon 0.90 1
28、.00 0.05 0.35 0.30 0.60 0.040 0.040 NOTE 1Unless otherwise agreed at the time of ordering, the deoxidation condition for grade 4 is at the discretion of the manufacturer. Grades 12, 17 and 22 are available as rimming, balanced or killed steels and any preference should be indicated by employing the
29、appropriate prefix to the grade (see 6.1). Grades 10, 20, 30, 40, 50, 60, 70, 80 and 95 are all killed steels. NOTE 2For grades 30 to 95 inclusive the purchaser may order to restricted ranges of carbon and manganese within the ranges specified in the table. For steels containing up to and including
30、0.85% C, the minimum carbon range is 0.05% (e.g.0.40/0.45% C). Above 0.85% carbon, the minimum carbon range is 0.07% (e.g.0.93/1.00% C). These steel types may also be ordered with a restricted manganese range of 0.20% (e.g.0.60/0.80% Mn) when this is required for special applications. NOTE 3The purc
31、haser may order to specified lower maxima for sulphur and phosphorus by arrangement with the supplier. NOTE 4The analysis of the product may vary from the chemical composition, specified in the table for the appropriate grade, by the variations given in appendix A of BS1449-1.1:1991. This does not a
32、pply to rimmed (R) or balanced (B) steels, which may show wider variations than those given in appendix A of BS1449-1.1:1991. NOTE 5Where case hardening is to be carried out, a silicon-killed, aluminium-free steel is more suitable.BS1449-1.14:1991 BSI 12-1998 3 Table 2 Mechanical properties Rolled c
33、ondition and grade Material condition Tensile properties a Hardness HV a Bend mandrel diameter b(180 bend) for strip thicknesses up to and including 10 mm Remarks Yield strength R e , min. Tensile strength, R m Elongation A, min. Original gauge length, L o 50 mm 80 mm c min. max. N/mm 2 N/mm 2 % % H
34、S4 Hot rolled (170) (280) (25) (23) 1a The bend mandrel diameter for strip 3mm thick is 2a HS10 Hot rolled 135 1a The bend mandrel diameter for strip 3mm thick is 1a HS10 Annealed d 120 1a HS10 Hardened in water from 900C (core properties of case-hardened component) 200 300 HS12 Hot rolled 170 310 2
35、5 (23) 1a HS17 Hot rolled 200 350 25 (23) 2a HS20 Hot rolled 350 540 18 (16) 2a HS22 Hot rolled 230 400 24 (22) 2a HS30 Hot rolled 280 500 18 (16) 3a HS40 Hot rolled 300 540 16 (14) (230) 4a HS40 Normalized 300 540 16 (14) 230 4a HS50 Hot rolled (230) HS50 Normalized 230 4a HS50 Annealed 175 2a HS50
36、 Induction or flame hardened 700 HS60 Hot rolled (270) HS60 Normalized 270 HS60 Annealed 185 3a HS70 Hot rolled (285) HS70 Normalized 250 300 HS70 Annealed 195 4aBS1449-1.14:1991 4 BSI 12-1998 Table 2 Mechanical properties Rolled condition and grade Material condition Tensile properties a Hardness H
37、V a Bend mandrel diameter b(180 bend) for strip thicknesses up to and including 10 mm Remarks Yield strength R e , min. Tensile strength, R m Elongation A, min. Original gauge length, L o 50 mm 80 mm c min. max. HS80 Hot rolled (300) HS80 Normalized 270 320 HS80 Annealed 205 5a HS95 Hot rolled (330)
38、 HS95 Normalized 330 350 HS95 Annealed 220 6a NOTEa is the thickness of the bend test piece. a Tensile and hardness property figures in brackets are for guidance only. b Bend mandrel diameter for strip thicknesses over 10 mm may be specified by agreement between manufacturer and purchaser. c The 80
39、mm gauge length is currently not used in the UK but, as a step towards conforming with European practice, tentative values have been included. d Material supplied in the annealed (A) condition has to be capable of meeting the specified properties in the hardened and tempered (HT) condition, when hea
40、t treated by a process agreed between the manufacturer and purchaser.BS1449-1.14:1991 BSI 12-1998 Publication(s) referred to BS 1449, Steel plate, sheet and strip. BS 1449-1.1, General specification.BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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