1、BRITISH STANDARD BS 2772-3: 1987 Colliery haulage and winding equipment Part 3: Specification for 1.5% manganese steel castings UDC 669.14:622.67BS2772-3:1987 This British Standard, having been prepared under the directionof the Iron and SteelStandards Committee, waspublished under the authorityof t
2、he Board of BSI andcomes into effect on 30 January 1987 BSI 12-1999 First published February 1957 First revision January 1987 The following BSI references relate to the work on this standard: Committee reference ISM/6 Draft for comment 84/42266 DC ISBN 0 580 15656 7 Committees responsible for this B
3、ritish Standard The preparation of this British Standard was entrusted by the Iron and Steel Standards Committee (ISM/-) to Technical Committee ISM/6, upon which the following bodies were represented: Associated Offices Technical Committee BEAMA Ltd. British Gas Corporation British Railways Board Br
4、itish Steel Industry British Valve Manufacturers Association Ltd. Electricity Supply Industry in England and Wales Engineering Equipment and Materials Users Association Institute of British Foundrymen Institution of Mechanical Engineers Lloyds Register of Shipping Ministry of Defence Process Plant A
5、ssociation Steel Casting Research and Trade Association Amendments issued since publication Amd. No. Date of issue CommentsBS2772-3:1987 BSI 12-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Steel making process 1 3 Chemical composition 1 4 Heat treatment 1 5
6、Surface finish 1 6 Non-destructive examination 1 7 Rectification of castings 1 8 Provision of material for testing 1 9 Mechanical tests 1 10 Mechanical properties 2 11 Retests 2 12 Traceability 2 13 Manufacturers certificate 2 Appendix A Information to be supplied by the purchaser 3 Table 1 Chemical
7、 composition 1 Table 2 Mechanical properties 2 Publications referred to Inside back coverBS2772-3:1987 ii BSI 12-1999 Foreword This revision of this Part of BS2772 was prepared under the Iron and Steel Standards Committee. It supersedes BS2772-3:1957, which is withdrawn. Since1957 many developments
8、have taken place both in the steel foundry industry and in mining operations which have made necessary a revision of this Part of BS2772. A number of changes from the previous edition have been made. These include the use of Charpy V-notch impact values instead of the Izod values previously specifie
9、d, as is now also the case with BS2772-2. The British requirement for notch ductility at10 C is considered necessary in view of the operational conditions likely to be encountered in service. The procedure for welding given in AppendixB of the1957 edition has been omitted and all welding requirement
10、s now refer to the appropriate British Standard, BS4570-1. The test values obtained on the test pieces do not necessarily represent the properties of the castings themselves, which may be affected by solidification conditions and rate of cooling during heat treatment, which in turn are influenced by
11、 casting thickness, size and shape. Purchasers are therefore advised to consult the manufacturer regarding the properties that can be expected in the castings being ordered. The other Part of BS2772 is Part2, which covers wrought steel. Part1 on wrought iron was withdrawn in1973. A British Standard
12、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 legal obligations. Summary of pages This document comprises a front cover, an i
13、nside front cover, pages i and ii, pages1to4, 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 table on the inside front cover.BS2772-3:1987 BSI 12-1999 1 1 Scope This Part of
14、BS2772 specifies requirements for1.5% manganese steel castings to be used for colliery haulage and winding equipment, more particularly mine car couplings, manriding car couplings and rope sockets. NOTE 1Information which the purchaser is strongly recommended to provide is given inAppendix A. NOTE 2
15、The standard is for steel castings and thus the purchaser referred to is the purchaser of the steel castings and not the purchaser of the components made from these castings. NOTE 3The titles of the publications referred to in this standard are listed on the inside back cover. 2 Steel making process
16、 The steel shall be made by an electric process, the AOD (argon oxygen decarburization) process or the acid converter process. 3 Chemical composition The chemical composition of each cast of the material shall be determined. Analysis shall be carried out on a test sample made from the same cast as t
17、he castings represented. In cases of dispute, compliance with this standard shall be decided on the basis of an independent analysis using the methods described in BS6200 or BS Handbook no.19. The steel shall comply withTable 1. Table 1 Chemical composition 4 Heat treatment Castings shall be heat tr
18、eated by normalizing and tempering or hardening and tempering as appropriate to section size, to give the mechanical properties specified in clause10. 5 Surface finish All castings shall be fettled and dressed, and all surfaces shall be cleaned for inspection purposes. NOTEAny specific requirements
19、for surface dressing should be agreed by the manufacturer and the purchaser. 6 Non-destructive examination All castings shall be visually inspected and, if stated on the enquiry and order, shall be subjected to further non-destructive testing in accordance with BS4080 or BS6208 (seeAppendix A). NOTE
20、The choice of BS4080 or BS6208 and the acceptance criteria should be agreed, bearing in mind the service conditions to which the castings will be subjected. 7 Rectification of castings 7.1 Where present, defects of a severity level greater than the acceptance criteria shall be removed and the excava
21、tion blended out or repaired by welding. NOTE 1The purchaser may require that he be informed of the extent and position of weld rectification (seeAppendix A). NOTE 2The purchaser may require that no rectification be carried out without prior sanction in writing (seeAppendix A). 7.2 When rectificatio
22、n by welding is carried out the welding shall be performed in accordance with BS4570-1. The excavated cavity shall be checked by magnetic particle inspection prior to repair welding, to ensure that the defect has been fully removed. 7.3 In cases where castings are required to be subjected to non-des
23、tructive testing, in accordance with BS4080 or BS6208, they shall be re-examined in the area of the rectification (seeclause6). 8 Provision of material for testing If the purchaser does not specify whether test samples are to be either a) separately cast, or b) in the form of cast-on test blocks, th
24、en separately cast test blocks shall be produced. NOTECast-on test blocks should only be specified where practicable and should be located in positions that do not affect the soundness of the casting. The separately cast test blocks shall be cast in moulds of the same moulding material as is used fo
25、r the castings and shall be poured from the same ladle of steel. Identified test blocks shall be provided to permit tests and, if necessary, retests, that are representative of each heat treatment batch from every cast. One tensile and three impact test pieces shall be prepared from test blocks repr
26、esentative of each heat treatment batch. 9 Mechanical tests 9.1 Tensile test The tensile test shall be carried out in accordance with BS18-2. Element Minimum content Maximum content % % Carbon 0.12 0.22 Silicon 0.60 Manganese 1.30 1.70 Phosphorus 0.050 Sulphur 0.050BS2772-3:1987 2 BSI 12-1999 9.2 Im
27、pact test The Charpy V-notch impact test shall be carried out in accordance with BS131-2. The test temperature shall be10 C. 9.3 Brinell hardness test The Brinell hardness test shall be carried out in accordance with BS240 on a representative sample of castings from each cast/heat treatment batch co
28、mbination. NOTE 1It is imperative that the purchaser state the number and location of hardness tests required on the enquiry and order (seeAppendix A). NOTE 2It is recommended that, whenever practicable, a10mm diameter ball and a load of3000kgf be used. 10 Mechanical properties 10.1 Tensile and impa
29、ct properties The mechanical properties of test pieces prepared and tested in accordance with clauses8, 9.1, 9.2 and, where appropriate, clause11 shall comply withTable 2. The average of the three impact test values shall be not less than the value specified inTable 2. No single value shall be lower
30、 than70% of the specified value inTable 2. 10.2 Brinell hardness The hardness values obtained on testing in accordance with9.3 shall comply withTable 2. 11 Retests 11.1 If the results of any mechanical test carried out on the test pieces or castings fail to comply with clause10, the manufacturer sha
31、ll follow procedurea) orb), as appropriate. a) Failure to comply with tensile and/or impact requirements: repeat on two additional test pieces the mechanical test in which failure occurred. b) Failure to comply with tensile and/or impact and/or Brinell hardness requirements: submit the castings, tog
32、ether with the test blocks, to further heat treatment, after which the test pieces prepared therefrom or castings shall be submitted to all mechanical tests specified in clause9. Table 2 Mechanical properties 11.2 In the case of further failure the castings, together with the test blocks shall be su
33、bmitted to further heat treatment, after which the test pieces prepared therefrom or castings shall be subjected to all the mechanical tests specified in clause9. The castings and test blocks shall not be subjected to more than two additional austenitizing heat treatments. 12 Traceability A means of
34、 traceability to the cast shall be provided. NOTE 1It is permissible for this identification to be stamped on the castings using low stress stamps. NOTE 2Where practicable the manufacturers identity mark should be cast or stamped on each casting. 13 Manufacturers certificate The manufacturer shall s
35、upply a manufacturers certificate. It shall state the cast analysis, the heat treatment given and the results of the mechanical tests. Mechanical property Value Tensile strength, R m 495 N/mm 2min. a Lower yield stress, R e , or 0.2% proof stress, LR p0.2 310 N/mm 2min. a Elongation, A on gauge leng
36、th L o= 5.65 S o 22% min. Charpy V-notch impact value, KV (10 C) 25 J min. (see note) Brinell hardness, HB 140 HB to 179 HB NOTEThe Charpy V-notch impact value of 25J is applicable only to separately cast test blocks. Where test blocks are cast on, the Charpy V-notch impact value should be agreed. a
37、 1 N/mm 2= 1 MPa.BS2772-3:1987 BSI 12-1999 3 Appendix A Information to be supplied by the purchaser It is essential that the purchaser provide the following information: a) the number and Part of this British Standard, i.e.BS2772-3; b) whether the purchaser wishes to be informed of the extent and po
38、sition of weld rectification (seeclause7); c) whether rectification can be carried out without prior sanction in writing (see clause7); d) the number and location of Brinell hardness tests required (see9.3); e) the acceptance criteria for visual inspection 1) ; f) if non-destructive testing is to be
39、 carried out, the inspection procedure required and the acceptance criteria (see clause6) 1) ; g) whether cast-on test blocks are required 1)(seeclause8). 1) This will subsequently be agreed with the manufacturer.4 blankBS2772-3:1987 BSI 12-1999 Publications referred to BS 18, Methods for tensile te
40、sting of metals. BS 18-2, Steel (general). BS 131, Methods for notched bar tests. BS 131-2, The Charpy V-notch impact test on metals. BS 240, Method for Brinell hardness test and for verification of Brinell hardness testing machines. BS 4080, Methods for non-destructive testing of steel castings. BS
41、 4570, Fusion welding of steel castings. BS 4570-1, Production, rectification and repair. BS 6200, Sampling and analysis of iron, steel and other ferrous metals. BS 6208, Methods for ultrasonic testing and for specifying quality levels of ferritic steel castings. BS Handbook no. 19 Methods for the s
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