1、BRITISH STANDARD BS ISO 6305-2:2007 Railway components Technical delivery requirements Part 2: Non-alloy carbon steel baseplates ICS 45.080 BS ISO 6305-2:2007 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 October 2007 BSI 2007 ISBN 978 0
2、 580 60470 6 National foreword This British Standard is the UK implementation of ISO 6305-2:2007. It supersedes BS 751:1992 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee RAE/2, Railway track components. A list of organizations represented on this co
3、mmittee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since p
4、ublication Amd. No. Date Comments Reference number ISO 6305-2:2007(E)INTERNATIONAL STANDARD ISO 6305-2 Second edition 2007-02-15 Railway components Technical delivery requirements Part 2: Non-alloy carbon steel baseplates lments constitutifs de la voie ferre Spcifications techniques de livraison Par
5、tie 2: Selles en acier au carbone non alli BS ISO 6305-2:2007ii iii Contents Page Foreword iv 1 Scope . 1 2 Normative references . 1 3 General requirements. 1 3.1 Steelmaking process 1 3.2 Manufacture of baseplates 2 3.3 Freedom from defects 2 3.4 Drawings and working gauges 2 3.5 Finishing 2 3.6 Fl
6、atness . 3 4 Technical requirements . 3 4.1 Tensile properties. 3 4.2 Properties of bend test. 3 4.3 Dimensional tolerances . 3 5 Acceptance testing. 4 5.1 General. 4 5.2 Number of tests. 4 5.3 Dimensions and finish 5 5.4 Sampling for mechanical test 5 5.5 Dimensional checks . 5 6 Test methods. 5 6.
7、1 Tensile test 5 6.2 Bend test 6 6.3 Retest . 6 6.4 Interpretation of dimensional inspection . 6 6.5 Alternative to dimensional inspection by selection from batches Quality control cards 6 7 Marking 7 8 Information to be supplied by the purchaser 7 Annex A (normative) Checking of dimensions and tole
8、rances. 8 Annex B (normative) Progressive sampling plan Wald method. 10 Annex C (normative) Progressive sampling plan for inspection of resubmitted batches . 12 BS ISO 6305-2:2007iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodi
9、es (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 has the right to be represented on that committee. International organizations
10、, 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. International Standards are drafted in accordance with the rules given in the IS
11、O/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. Publication as an International Standard requires approval by at least 75 % of the
12、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 rights. ISO 6305-2 was prepared by Technical Committee ISO/TC 17, Steel, Subcom
13、mittee SC 15, Railway rails and their fasteners. This second edition cancels and replaces the first edition (ISO 6305-2:1983), which has been editorially revised. ISO 6305 consists of the following parts, under the general title Railway components Technical delivery requirements: Part 1: Rolled stee
14、l fishplates Part 2: Non-alloy carbon steel baseplates Part 3: Steel sleepers Part 4: Untreated steel nuts and bolts and high-strength nuts and bolts for fishplates and fastenings Part 1 of ISO 6305 was withdrawn by systematic review in 2002. BS ISO 6305-2:20071 Railway components Technical delivery
15、 requirements Part 2: Non-alloy carbon steel baseplates 1 Scope This part of ISO 6305 specifies the quality requirements of the product and the conditions of acceptance testing for rolled non-alloy carbon steel baseplates for use with flat-bottom railway rails. 2 Normative references The following r
16、eferenced 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 amendments) applies. ISO 377, Steel and steel products Location and preparation of sa
17、mples and test pieces for mechanical testing ISO 2859-1, Sampling procedures for inspection by attributes Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection ISO 2859-2, Sampling procedures for inspection by attributes Part 2: Sampling plans indexed by limiti
18、ng quality (LQ) for isolated lot inspection ISO 2859-3, Sampling procedures for inspection by attributes Part 3: Skip-lot sampling procedures ISO 2859-4, Sampling procedures for inspection by attributes Part 4: Procedures for assessment of declared quality levels ISO 6506-1, Metallic materials Brine
19、ll hardness test Part 1: Test method ISO 6892, Metallic materials Tensile testing at ambient temperature ISO 7438, Metallic materials Bend test 3 General requirements 3.1 Steelmaking process The steelmaking process shall be the responsibility of the manufacturer of the baseplates. If requested by th
20、e purchaser at the time of enquiry or order, the manufacturer shall describe the steelmaking and casting processes employed. The manufacture shall not alter these without the agreement of the purchaser. BS ISO 6305-2:20072 3.2 Manufacture of baseplates The baseplates shall be manufactured by cutting
21、 to length a rolled section and finishing in accordance with drawings supplied by the purchaser. 3.3 Freedom from defects The baseplates shall be free from defects adversely affecting their performance in service. Slight defects outside the rail seating surface may be accepted by the receiving inspe
22、ctor if considered negligible. Any operation carried out either in the cold or hot state, with the object of concealing a defect adversely affecting the performance of the baseplates in service is not permitted. 3.4 Drawings and working gauges A copy of the final drawings shall be supplied to the ma
23、nufacturer by the purchaser, together with the notification of approval of the order. If stated in the order, the manufacturer, before starting production, shall make up two sets of maximum and minimum working gauges, incorporating the specified dimensional tolerances. If required by the purchaser,
24、the working gauges shall be stamped after approval by the purchasers representative. Only these working gauges shall be valid for checking purposes. One set of working gauges shall be made available to the receiving inspector for the period of acceptance testing. The working gauges shall be provided
25、 at the manufacturers expense. New working gauges need not be provided for items ordered in quantities of less than 10 000 at any one time. When the working gauges have been approved by a purchaser, or by an outside testing agency, these shall be used for other purchasers, wherever possible. 3.5 Fin
26、ishing The rolling and baseplate finishing processes shall be the responsibility 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
27、the agreement of the purchaser. 3.5.1 Baseplate length The rolled bars used shall be cut to length by any suitable method which does not impair the section and the quality of the metal. Each cut shall be perpendicular to the axis, clean and free of burrs. Any projections shall be removed from the su
28、rfaces bearing on the rail. Hammering is not allowed. Downward deformation of baseplate edges due to shearing is permissible up to a limit of 1,5 mm, over a width of 20 mm for parts less than 33 mm thick and to 3 mm for parts more than 33 mm thick. BS ISO 6305-2:20073 3.5.2 Holing One or more of the
29、 following methods shall be used 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 dimensional toleran
30、ces given in 4.3. Burrs resulting from these operations shall be removed. 3.6 Flatness The surfaces on which the rails bear shall not deviate from flatness by more than 0,5 mm. The purchaser shall specify in the order whether the surface may be convex or concave. 4 Technical requirements 4.1 Tensile
31、 properties The steel used for the manufacture of baseplates shall be of one of the grades defined in Table 1 and as selected by the purchaser. Table 1 Mechanical properties of steel grades to be used Tensile strength R mMinimum elongation N/mm 2% 380 to 480 480 to 620 24 18 Other steel grades may b
32、e used, subject to agreement in the order between the purchaser and the manufacturer. 4.2 Properties of bend test The plate shall not show any sign of fracture when bent through an angle of 135. 4.3 Dimensional tolerances The methods and means of checking the principal dimensional tolerances are def
33、ined in Table 2. If, for normal operations and by agreement between the manufacturer and the purchaser, gauges different from but equivalent to those given in 3.4 are used, only the latter shall be used in case of dispute. BS ISO 6305-2:20074 Table 2 Tolerances of baseplate dimensions Dimension Tole
34、rancesaChecking methods in accordance with Annex A mm Length L Dimension parallel to the rail 4 Minimum/maximum gauge Width I Width of the rolled section 3 Minimum/maximum gauge Thickness 1 The thickness shall be measured at the two extremities of the baseplate section Deviation e of the lips +1,5 0
35、 Minimum/maximum gauge End squareness 4 Size of the fixing holes For drilled holes: + 0,5 mm For punched holes: the above tolerances are increased by 0,10 times the thickness for the exit side of the punched hole. Position of the holes The position of the holes shall enable the baseplate to be mount
36、ed on a gauge with pins placed at the specified spacing; the diameter/size of the pins shall be 1,5 mm less than that of the holes. The length of the working gauge shall be equal to the length of the baseplate plus the maximum tolerance. The baseplates shall be able to fit over the working gauge, th
37、e pins engaging simultaneously in the holes, and the ends not overlapping the working gauge. Working gauge Surface inclination 7/1 000 By difference of two thickness measurements taken as close as possible to the lips. aFor high-speed tracks (as a guide W 160 km/h), the question of tolerances shall
38、be subject to agreement between the purchaser and the manufacturer. 5 Acceptance testing 5.1 General The tests shall be carried out in the manufacturers works; the preparation of the testpieces and the tests shall be at the manufacturers expense. 5.2 Number of tests One tensile test shall be carried
39、 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 shall be made. BS ISO 6305-2:20075 5.3 Dimensions and finish The inspection of dimensions covers the dimensions and measurements below: width of section (I); deviation between li
40、ps (e); diameter of holes; position of holes; surface inclination; flatness of the rail seat. The other dimensions for which tolerances are specified in Table 2 may at any time be checked by the receiving inspector, but are not subject to the systematic inspection specified in 6.3. 5.4 Sampling for
41、mechanical test The parts shall be selected for sampling as directed by the receiving inspector. The test pieces shall be cut in the rolling direction. Samples for the preparation of tensile test pieces shall be taken in accordance with ISO 377. Cutting and finishing shall be carried out entirely in
42、 the cold state, by means of machine tools and without any hammering, cold deformation, hardening or annealing. If possible, the test pieces shall be cylindrical and have a diameter of 10 mm, i.e. a section of 78,5 mm 2 . The gauge length shall be 50 mm, and the parallel length shall be between 60 a
43、nd 70 mm. Hardness measurements may be carried out by agreement with the purchaser, provided that such hardness measurements replace the tensile test. Hardness tests in accordance with ISO 6506-1 may be agreed at the time of enquiry and order. 5.5 Dimensional checks The parts selected for sampling s
44、hall be grouped in batches of the same kind. The samples shall be selected in such a way that they are representative of the batches submitted. The size of a batch shall be not less than 3 000 parts, and not more than 10 000 parts. The receiving inspector has the right to break down or form batches
45、for inspection purposes. The parts selected for sampling shall be marked by the receiving inspector, and these marks shall be kept intact until the end of the acceptance testing operations. 6 Test methods 6.1 Tensile test The tensile test shall be carried out in accordance with ISO 6892. The steel t
46、ested shall meet the quality requirements corresponding to one of the grades shown in Table 1. BS ISO 6305-2:20076 6.2 Bend test Where requested, the bend test in accordance with ISO 7438 may be applied. 6.3 Retest If, from the batch corresponding to a cast or part cast, the single part selected for
47、 the test does not satisfy the conditions laid down, two re-tests shall be carried out as directed by the receiving inspector. If one of these re- tests is not satisfactory, the corresponding batch shall be rejected. 6.4 Interpretation of dimensional inspection Any baseplate which, on inspection, is
48、 found to have at least one measurement exceeding the tolerances, or which does not satisfy the finish specified in 5.3, shall be deemed not to conform. Dimensional inspection shall be carried out by random sampling from batches of baseplates. The statistical sampling programme to be used shall be a
49、greed between the purchaser and the manufacturer. The agreement shall define the acceptable levels of quality and the risks, and the size of the batch and of the sample. In the absence of such an agreement, the statistical sampling plan shall be carried out in accordance with the Wald diagram or in accordance with the corresponding table of ISO 2859-1, ISO 2859-2, ISO 2859-3 or ISO 2859-4, which involves the same risks fo
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