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1、BRITISH STANDARD BS 751:1992 Specification for Steel baseplates for flat bottom railway rails Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:59:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 751:1992 This British Standard, having been prepared under the di
2、rection of the Iron and Steel Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 December 1992 BSI 03-1999 First published September 1937 Second edition October 1959 Third edition December 1992 The following BSI references relate to the w
3、ork on this standard: Committee reference ISM/74 Draft for comment 91/38173 DC ISBN 0 580 20980 6 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/74, upon which
4、 the following bodies were represented: British Industrial Fasteners Federation British Railways Board British Steel Industry Department of Transport (Transport Industries) London Underground Ltd. Railway Industry Association of Great Britain Amendments issued since publication Amd. No.DateComments
5、Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:59:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 751:1992 BSI 03-1999i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2References1 3Manufacture1 4Chemical composition of the steel1
6、5Marking1 6Tensile properties1 7Drawings and working gauges1 8Freedom from defects2 9Finishing2 10Dimensional tolerances3 11Tensile tests3 12Manufacturers tests and certificates3 13Inspection3 Annex A (informative) Batch inspection procedures4 Annex B (informative) Information to be supplied by the
7、purchaser of the baseplates5 Figure A.1 Progressive sampling plan (Wald method)4 Figure A.2 Progressive sampling plan for inspection of resubmitted batches5 Table 1 Tensile properties1 Table 2 Dimensional tolerances2 List of referencesInside back cover Licensed Copy: London South Bank University, Lo
8、ndon South Bank University, Fri Dec 08 12:59:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 751:1992 ii BSI 03-1999 Foreword This British Standard has been prepared under the direction of the Iron and Steel Standards Policy Committee. It supersedes BS 751:1959 which is withdrawn. This revision int
9、roduces dimensional tolerances for the first time. It requires the use of steel in accordance with BS EN 10025 and recognizes quality assurance requirements and the use of sampling techniques. Purchasers ordering to this British Standard are advised to specify in their purchasing contract that the s
10、upplier operates a quality system complying with BS 5750 to ensure to their satisfaction that products claimed to comply with BS 751 consistently achieve the required level of quality. Where practicable, this standard aligns with ISO 6305-2:1983 Part 1, Unalloyed carbon steel baseplates published by
11、 the International Organization for Standardization (ISO). 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 confer immunity from l
12、egal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 6, 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 in the amendment
13、table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:59:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 751:1992 BSI 03-19991 1 Scope This British Standard specifies the tensile properties for the grade of steel used and the dimen
14、sional tolerances of rolled steel baseplates for use with flat bottom railway rails. NOTE 1Whilst this standard does not specify requirements for forged or cast baseplates some of its provisions may be applied to such products where appropriate. NOTE 2Recommended batch inspection procedures are desc
15、ribed in Annex A. Information to be supplied by the purchaser is given in Annex B. 2 References 2.1 Normative references This British Standard incorporates, by reference, provisions from specific editions of other publications. These normative references are cited at the appropriate points in the te
16、xt and the publications are listed on the inside back cover. Subsequent amendments to, or revisions of, any of these publications apply to this British Standard only when incorporated in it by updating or revision. 2.2 Informative references This British Standard refers to other publications that pr
17、ovide information or guidance. Editions of these publications current at the time of issue of this standard are listed on the inside back cover, but reference should be made to the latest editions. 3 Manufacture 3.1 Manufacture of steel The source of the steel and the steelmaking process shall be th
18、e responsibility of the manufacturer of the baseplates. If requested by the purchaser at the time of enquiry or order the manufacturer shall describe the source of steel supply and the steel making and casting processes employed. The manufacturer shall not alter these without the agreement of the pu
19、rchaser. 3.2 Manufacture of baseplates The baseplates shall be manufactured from a hot rolled section, cut to length and holed in accordance with 9.2 and 9.3. Sufficient crop shall be taken to ensure that end defects are removed. The rolling and baseplate finishing processes shall be the responsibil
20、ity of the manufacturer. If requested by the purchaser at the time of enquiry or order the manufacturer shall describe the rolling and baseplate finishing processes employed. The manufacturer shall not alter these without the agreement of the purchaser. 4 Chemical composition of the steel The chemic
21、al composition of the steel shall conform to any grade of steel shall conform to any grade of steel from BS EN 10025:1990 selected by the manufacturer, to meet the mechanical properties specified in clause 6. The manufacturer shall, if requested, provide the analysis of each cast on the test certifi
22、cate. 5 Marking Brand marks shall be rolled in relief in such a position that the following information can be seen when the baseplate is fixed in position: a) the designation of the baseplate; b) the identification mark of the manufacturer; c) the last two figures of the year of manufacture. Each e
23、lement of the brand mark shall be separated by a hyphen of minimum length 0.7 times the height of the brand letters and numbers. Example: ABC 20 X the size of the pins shall be 1.5 mm less than that of the holes. The plates shall be able to fit over the working gauge, the pins engaging simultaneousl
24、y in the holes Surface inclination 7/1 000 StraightnessFor plates supplied in rolled bars Longitudinal on flat of plate 1 in 1 m Longitudinal on edge of plate 1 in 1 m FlatnessFor finished platesBack of plate 1 Rail seatShall be flat to convex up to a maximum of 0.5 mm (see note 2) NOTE 1For high sp
25、eed track ( 160 kmph) other dimensional tolerances can be agreed at time of enquiry and order. NOTE 2If stipulated at the time of the enquiry or order (see Annex B) the rail seat shall be flat to concave up to a maximum of 0.5 mm. NOTE 3Dimensional tolerances relating to the function of the rail fas
26、tening system should be agreed at the time of the enquiry or order. 1.5 0 + Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:59:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 751:1992 BSI 03-19993 9.3 Holing One or more of the following methods shall be used
27、 for producing the holes: a) drilling; b) cold punching; c) hot punching; d) machining. All precautions shall be taken to ensure that the rail bearing surface is not deformed or the steel impaired. The dimensions of the hole shall remain within the tolerances given in Table 2. Burrs resulting from t
28、hese operations shall be removed. 10 Dimensional tolerances The dimensional tolerances of rolled bar and finished baseplate shall conform to Table 2. 11 Tensile tests 11.1 Method of test The manufacturer shall determine the tensile properties of the steel in accordance with BS EN 10002-1:1990 using
29、a rectangular cross section tensile test piece. NOTERound tensile test pieces may be used when section thickness permits. 11.2 Number of tests One tensile test shall be carried out on one of each type of baseplate per cast for casts of 50 t or less. For casts greater than 50 t, two tests per cast sh
30、all be made. 11.3 Test pieces The test piece shall be cut with longitudinal axes in the rolling direction. Cutting and finishing shall be carried out entirely in the cold state, by means of machine tools and without any hammering, cold deformation, hardening or annealing. 11.4 Retests If the sample
31、part selected for the test does not satisfy the conditions laid down, two retests from the same cast or part cast shall be carried out. If one of the retests does not satisfy the conditions laid down, the cast or part cast shall be deemed to fail to conform to this standard. 12 Manufacturers tests a
32、nd certificates The manufacturer shall be responsible for the supply, preparation and testing of test pieces. The manufacturer shall supply the purchaser with certificates showing the source and method of steelmaking/casting used and the results of the mechanical tests. The results of the chemical a
33、nalysis, when requested, shall be included. 13 Inspection The manufacturer shall inspect all batches of baseplates and ensure that they conform to this British Standard. All nonconforming batches shall be clearly marked. NOTE 1Recommended inspection procedures are described in Annex A. The inspectio
34、n or quality assurance system to be applied shall be defined at the time of enquiry or order (see item e) of Annex B) and shall be based on one of the following: a) the purchaser shall require the manufacturer to take responsibility for quality assurance based on a procedure in compliance with BS 57
35、50-2:1987; b) alternatively, the purchaser shall be advised in advance by the manufacturer of the dates of rolling, of sample selection and of mechanical testing of the test pieces to enable the purchaser to witness these procedures and of the availability of the finished product for inspection. The
36、re shall be access during working hours for the purchaser to observe the manufacturing process and to inspect the finished product. NOTE 2Any batches which do not conform should be sorted before submission for the purchasers inspection. Licensed Copy: London South Bank University, London South Bank
37、University, Fri Dec 08 12:59:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 751:1992 4 BSI 03-1999 Annex A (informative) Batch inspection procedures A.1 General The baseplates should be grouped into batches of the same kind. Inspection should be carried out by random sampling from the batches. The
38、 selected samples should be marked and these marks should be kept intact until the end of inspection. One of the sampling procedures described in A.2, A.3 and A.4 should be used to define the acceptable levels of quality and risks and the size of the batch and of the sample. A.2 A sampling programme
39、 according to BS 6001 The relevant table from BS 6001 should be stated by the purchaser. A.3 A sampling programme according to the Wald method This design is shown in Figure A.1, with the resubmitted batch sampling diagram in Figure A.2. The risks with this method are as follows: a) 5 % maximum prob
40、ability of the rejection of a batch containing no more than 5 % of faulty parts; b) 5 % maximum probability of the acceptance of a batch containing not less than 15 % of faulty parts. It is essential that the tests be terminated as soon as the point representing the progress of the check enters the
41、acceptance or rejection area. A.4 A sampling programme designed and detailed by the purchaser This programme should state: a) the batch size; b) the sample size; c) the maximum percentage of rejected baseplates in the sample which will permit the batch to be accepted; d) the percentage of rejected b
42、aseplates in the sample which will cause the batch to be inspected on an individual plate basis; e) the retest programme for batches where the percentage of rejected baseplates in the sample falls between the reject/accept percentage (where applicable). Figure A.1 Progressive sampling plan (Wald met
43、hod) Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:59:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 751:1992 BSI 03-19995 Annex B (informative) Information to be supplied by the purchaser of the baseplates When placing an order for baseplates complying w
44、ith this standard the purchaser should state: a) the approved drawing reference for the baseplate section and holing (see clause 7); b) whether or not new templates and working gauges are required (see clause 7); c) the method to be used for producing the holes (see 9.3); d) whether chemical analysi
45、s is required (see clause 4); e) the procedure to be used for inspection (see clause 13); f) whether concave tolerance is required on rail seat flatness (see Table 2); g) any rail fastening system tolerances required (see note 3 to Table 2). Figure A.2 Progressive sampling plan for inspection of res
46、ubmitted batches Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:59:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 6 blank Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:59:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI
47、 BS 751:1992 BSI 03-1999 List of references (see clause 2) Normative references BSI standards publications BRITISH STANDARDS INSTITUTION, London BS 5750, Quality systems. BS 5750-2:1987, Specification for production and installation. BS EN 10002, Tensile testing of metallic materials. BS EN 10002-1:
48、1990, Method of test at ambient temperature. BS EN 10025:1990, Specification for hot rolled products of non-alloy structural steels and their technical delivery conditions. Informative references BSI standards publications BRITISH STANDARDS INSTITUTION, London BS 6001, Sampling procedures for inspec
49、tion by attributes. BS 6001-1:1991, Specification for sampling plans indexed by acceptable quality level (AQL) for lot-by-lot inspection. BS 6001-2:1984, Specification for sampling plans indexed by limiting quality (LQ) for isolated lot-inspection. BS 6001-3:1986, Specification for skip-lot procedures. ISO standards publications INTERNATIONAL ORGANIZATION FOR STANDARDIZATION (ISO), Geneva. (All publications are available from BSI Sales.) ISO 6305, Railway components Technical delivery requirements. ISO 6305-2:1983, Unalloyed carbon steel baseplates. Li
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