1、BRITISH STANDARD BS 1449-1.1: 1991 Steel plate, sheet and strip Part 1: Carbon and carbon-manganese plate, sheet and strip Section 1.1 General specificationBS1449-1.1:1991 This British Standard, having been prepared under the direction of the Iron and Steel Standards Policy Committee, was published
2、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 Draft announced in BSI News August 1991 ISBN 0 580 19870 7 Committees responsible for this British Standard The
3、 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 Association Society of Motor Manufacturers
4、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 issued since publication Amd. No. Date Com
5、mentsBS1449-1.1:1991 BSI 12-1998 i Contents Page Committees responsible Inside front cover Foreword ii 0 Introduction 1 1 Scope 1 2 Definitions 1 3 General 5 4 Steelmaking process 5 5 Chemical composition 5 6 Freedom from defects 6 7 Condition of material on delivery 6 8 Number of tests 6 9 Tensile
6、properties 6 10 Bending 6 11 Strain-age-embrittlement 6 12 Stabilization 6 13 Formability 6 14 Hardness 6 15 Decarburization test 6 16 Retests 6 17 Surface finish and surface inspection 7 18 Edge conditions 7 19 Inspection 7 20 Tolerances on dimensions and shape 7 21 Marking 7 Appendix A Product ana
7、lysis and permitted variations 8 Appendix B Methods of test 8 Appendix C Determination of r values 11 Figure 1 Bend test with the axis of the bend parallel to the direction of rolling 9 Figure 2 Bend test with the axis of the bend at 90 to the direction of rolling 10 Figure 3 Nomogram for determinat
8、ion of r values 12 Table 1 Symbols for material conditions 2 Table 2 Symbols for surface finishes and surface inspection 3 Table 3 Summary of material grades, chemical compositions and types of steel available 4 Table 4 Edge conditions 7 Table 5 Permitted variations of product analysis from specifie
9、d range. Applicable to killed (K) steels only 9 Publication(s) referred to Inside back coverBS1449-1.1:1991 ii BSI 12-1998 Foreword This Section of BS 1449 has been prepared under the direction of the Iron and Steel Standards Policy Committee and is a new edition of section one of BS 1449-1:1983. Th
10、is Section of BS 1449, together with BS1449-1.2 to 1.15 and BS EN 10130, supersedes BS 1449-1:1983 which is withdrawn. When EN 10130 “Cold rolled low carbon steel flat products for cold forming Technical delivery conditions” became available, it was a requirement that it should be published as a Bri
11、tish Standard and any conflicting national standards withdrawn. This meant that the requirements for cold rolled wide strip specified in section two of BS 1449-1:1983 had to be deleted with the exception of the requirements for sheets for vitreous enamelling. In view of the fact that there was other
12、 European work in hand which would also affect BS 1449-1, the Technical Committee responsible considered that BS 1449-1 should be split into a number of separately published Sections, mirroring as far as possible European work in hand or projected. In this way, when the equivalent European Standard
13、becomes available and is published as a British Standard, the appropriate Section of BS 1449-1 will be withdrawn. In Europe the practice is to prepare separate standards for hot rolled and cold rolled products and also for wide strip and narrow strip. Tolerance standards are also prepared as separat
14、e publications. Consequently BS1449-1:1983 has been split into 15 separately published Sections as listed below. The related draft European Standard, prEN, or Euronorm, EU, is indicated. Section 1.1, General specification. Section 1.2, Specification for hot rolled wide steel plate, sheet and wide st
15、rip based on formability. (Related. to EU111) Section 1.3, Specification for cold rolled steel plate, sheet and wide strip for vitreous enamelling based on formability. (Related to prEN 10209) Section 1.4, Specification for hot rolled wide material based on specified minimum strength. (Related to EU
16、 149) Section 1.5, Specification for cold rolled wide material based on specified minimum strength. (Related to EU 149) Section 1.6, Specification for tolerances on dimensions and shape for hot rolled wide material. (Related to prEN10051) Section 1.7, Specification for tolerances on dimensions and s
17、hape for cold rolled wide material. (Related to prEN10131) Section 1.8, Specification for hot rolled narrow strip based on formability. (Related to EU46) Section 1.9, Specification for cold rolled narrow strip based on formability. (Related to EU139) Section 1.10, Specification for hot rolled narrow
18、 strip based on specified minimum strength. (Related to EU149) Section 1.11, Specification for cold rolled narrow strip based on specified minimum strength. (Related to EU 149) Section 1.12, Specification for tolerances on dimensions and shape for hot rolled narrow strip. (Related to EU48) Section 1
19、.13, Specification for tolerances on dimensions and shape for cold rolled narrow strip. (Related to EU140) Section 1.14, Specification for hot rolled narrow strip supplied in a range of conditions for heat treatment and general engineering purposes. Section 1.15, Specification for cold rolled narrow
20、 strip supplied in a range of conditions for heat treatment and general engineering purposes.BS1449-1.1:1991 BSI 12-1998 iii 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
21、 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 to iv, pages1to 12, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had a
22、mendments incorporated. This will be indicated in the amendment table on theinside front cover.iv blankBS1449-1.1:1991 BSI 12-1998 1 0 Introduction 0.1 Designation system In this standard, symbols have been used to indicate all the conditions and surface finishes in which the various materials are a
23、vailable. The meaning of these symbols is given in Table 1 and Table 2 and their use is described in this Section of BS 1449 and in BS1449-1.2 to BS1449-1.15 as appropriate. Each of these appropriate Sections also includes a table which indicates the combinations of conditions and surface finishes t
24、hat are available for a particular grade of material. Attention 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. However, when it is necessary to specify the manufacturing method, the symbols
25、concerned with material conditions (seeTable 1) precede the material grade number in the following manner: a) the symbols R, B or K, signifying either a rimmed, balanced or killed steel; b) the symbols HR, HS, CR or CS, signifying the type of rolling; c) the symbol SP when the material is required i
26、n the skin passed condition; d) any other symbol concerned with material condition and which is appropriate to the grade being ordered (see the tables on availability in the appropriate Sections of BS 1449). Any symbols concerned with surface finish (seeTable 2) appear after the material grade numbe
27、r, Thus, material K CSSP 34/20 BR designates a killed steel in the form of cold rolled, skin passed, grade 34/20 narrow strip, supplied with a bright finish. Material 34/20 GP would be used to specify this material when the purchaser did not wish to be more precise about the manufacturing method. NO
28、TEWhen it is required to specify an edge condition (see2.9 and clause 18) it is sufficient to add, after the designation of the material, the symbol indicating the edge condition, e.g.edge E1. 0.2 Summary of material grades, chemical compositions and types of steel available The material grades, che
29、mical compositions and types of steel available in BS 1449-1.2 to BS1449-1.5, BS1449-1.8 toBS1449-1.11, BS1449-1.14 and BS1449-1.15 are summarized inTable 3. 1 Scope This Section of BS 1449 specifies general requirements for flat rolled carbon steel products, available in the hot or cold rolled cond
30、itions and in coil or cut length form, rolled as wide strip in nominal widths of 600mm and wider or as narrow strip in nominal widths less than 600mm, as specified in BS 1449-1.2 to BS1449-1.15. This Section of BS 1449 covers plate, sheet and strip in nominal thicknesses up to and including 16mm and
31、 the material grades, chemical compositions and types of steel summarized in Table 3. NOTEThe titles of the publications referred to in this standard are listed on page 16. 2 Definitions For the purposes of this Section of BS 1449 the following definitions apply. 2.1 flat products products of almost
32、 rectangular cross-section with a width much greater than the thickness 2.2 hot rolled flat products flat products produced by hot rolling NOTEThe very light cold rolling pass called “skin pass or “dressing pass”, generally resulting in a reduction in thickness of less than 5 %, that is given to cer
33、tain hot rolled flat products does not alter their classification as hot rolled products. 2.3 cold rolled flat products flat products that have undergone a reduction in thickness of at least 25 % by cold rolling NOTEIn the case of flat products of nominal width less than600mm and for certain qualiti
34、es of steel, material with a reduction of less than 25% may be included in this category. 2.4 hot or cold rolled strip a hot or cold rolled flat product which immediately after the final rolling pass is wound into regularly superimposed laps so as to form a coil with almost flat sides NOTE 1Strip as
35、 rolled normally has slightly convex edges (mill edges), but it may also be supplied with sheared or other edges (see 2.9) or it may be obtained by slitting from wider strip. Strip may be subsequently cut and supplied as sheet or cut lengths, or as coils of any narrower width. NOTE 2According to its
36、 rolled nominal width, strip is classified as defined in 2.5 and 2.6.BS1449-1.1:1991 2 BSI 12-1998 Table 1 Symbols for material conditions Condition Symbol Description Rimmed steel R Low carbon steel in which deoxidation has been controlled to produce an ingot having a rim or skin almost free from c
37、arbon and impurities, within which is a core where the impurities are concentrated Balanced steel B A steel in which processing has been controlled to produce an ingot with a structure between that of a rimmed and a killed steel. It is sometimes referred to as semi-killed steel Killed steel K Steel
38、that has been fully deoxidized Hot rolled on wide mills HR Material produced by hot rolling. This will have an oxide scale coating, unless an alternative finish is specified (see Table 2) Hot rolled on narrow mills HS Cold rolled on wide mills CR Material produced by cold rolling to the final thickn
39、ess Cold rolled on narrow mills CS Normalized N Material that has been normalized as a separate operation Annealed A Material in the annealed last condition (i.e. which has not been subjected to a final light cold rolling) Skin passed SP Material that has been subjected to a final light cold rolling
40、 Temper rolled Material rolled to the specified temper and qualified as follows: H1 H1 = eighth hard H2 H2 = quarter hard H3 H3 = half hard H4 H4 = three-quarters hard H5 H5 = hard H6 H6 = extra hard Hardened and tempered HT Material that has been continuously hardened and tempered in order to give
41、the specified mechanical propertiesBS1449-1.1:1991 BSI 12-1998 3 Table 2 Symbols for surface finishes and surface inspection Finish Symbol Description Pickled P A hot rolled surface afrom which the oxide has been removed by chemical means Mechanically descaled D A hot rolled surface afrom which the
42、oxide has been removed by mechanical means Full finish FF A cold rolled skin passed material having one surface free from blemishes liable to impair the appearance of a high class paint finish b General purpose finish GP A cold rolled material free from gross defects, but of a lower standard than FF
43、 b Matt finish M A surface finish obtained when material is cold rolled on specially prepared rolls as a last operation Bright finish BR A surface finish obtained when material is cold rolled on rolls having a moderately high finish. It is suitable for most requirements, but is not recommended for d
44、ecorative electroplating Plating finish PL A surface finish obtained when material is cold rolled on specially prepared rolls to give one surface which is superior to a BR finish and is particularly suitable for decorative electroplating Mirror finish MF A surface finish having a high lustre and ref
45、lectivity. Usually available only in narrow widths in cold rolled material Unpolished finish UP A blue/black oxide finish; applicable to hardened and tempered strip Polished finish PF A bright finish having the appearance of a surface obtained by fine grinding or abrasive brushing; applicable to har
46、dened and tempered strip Polished and coloured blue PB A polished finish oxidized to a controlled blue colour by further heat treatment; applicable to hardened and tempered strip Polished and coloured yellow PY A polished finish oxidized to a controlled yellow colour by further heat treatment; appli
47、cable to hardened and tempered strip Vitreous enamel VE A surface finish for vitreous enamelling of material of specially selected chemical composition Special finish SF Other finishes by agreement between the manufacturer and the purchaser NOTE 1Some of these finishes are available only from wide m
48、ills, others only from narrowmills. For availability see the specific requirements in BS 1449-1.2 to BS 1449-1.15 as appropriate. NOTE 2By special agreement between the supplier and the purchaser, cold rolled material can be supplied to surface texture specifications. The information to be given in
49、statements about surface texture requirements is specified in BS 1134-1. a A hot rolled surface supplied in the as-rolled condition, i.e. a non-descaled surface; some surface defects of steelmaking or rolling origin may be present, the proportion being greater with strip than with sheet or plate. b GP and FF finishes are normally supplied with a matt appearance.BS1449-1.1:1991 4 BSI 12-1998 Table 3 Summary of material grades, chemical compositions and types of steel available Section of BS1449 Material grade Rolled con
