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1、BRITISH STANDARD BS 1663:1950 Incorporating Amendment Nos. 1, 2, 3 and 4 Specification for Higher tensile steel chain grade 40 (Short link and pitched or calibrated) for lifting purposes Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 07:53:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 166
2、3:1950 This British Standard, having been approved by the Mechanical Engineering Industry Standards Committee, was published under the authority of the General Council on 15 December 1950 BSI 10-1999 ISBN 0 580 35510 1 Co-operating organizations The Mechanical Engineering Industry Standards Committe
3、e, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: Admiralty* Air Ministry Associated Offices Technical Committee* Association of Consulting Engineers (Incorporated) British
4、 Chemical Plant Manufacturers Association British Compressed Air Society British Electrical and Allied Manufacturers Association* British Engineers Association* British Internal Combustion Engine Manufacturers Association British Iron and Steel Federation British Railways, The Railway Executive* Cro
5、wn Agents for the Colonies* Department of Scientific and Industrial Research Engineering Equipment Users Association Institute of Marine Engineers* Institute of Petroleum Institution of Civil Engineers Institution of Gas Engineers Institution of Heating and Ventilating Engineers Institution of Mecha
6、nical Engineers* Institution of Mechanical Engineers (Automobile Division) Institution of Production Engineers Locomotive Manufacturers Association Machine Tool Trades Association Ministry of Fuel and Power* Ministry of Labour and National Service (Factory Department)* Ministry of Supply* Ministry o
7、f Transport Ministry of Works* Office of the High Commissioner for India* War Office The Government departments and scientific and industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the committees entrusted with the preparati
8、on of this standard: British Constructional Steelwork Association Chain and Anchor Manufacturers Association Chain Testers Association of Great Britain Dock and Harbour Authorities Association Federation of Civil Engineering Contractors Federation of Wire Rope Manufacturers of Great Britain Imperial
9、 Chemical Industries Institute of Welding Lloyds Register of Shipping Machine Made Chain Manufacturers Association Makers of Electrically Welded Chain National Association of Drop Forgers and Stampers National Federation of Building Trades Employers National Physical Laboratory Amendments issued sin
10、ce publication Amd. No.Date of issueComments 2120March 1955 2886August 1957 3297February 1959 4561May 1962Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 07:53:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1663:1950 BSI 10-1999i Contents Page Co-operat
11、ing organizationsInside front cover Forewordii Section 1. Definitions 1Size1 2Proof load1 3Processing1 4Inspector1 Section 2. Specification 5Types of chain1 6Quality of material1 7Heat treatment1 8Quality marking1 9Dimensions of links1 10Tolerances on pitched or calibrated chain2 11Workmanship2 Sect
12、ion 3. Testing 12Testing machine2 13Proof testing2 14Inserted links2 15Correctness of the pitch of pitched chain3 16Selection of samples for mechanical tests3 17Breaking test3 18Ultimate breaking load3 19Energy absorption factor3 20Up-ending test3 21Inspection marking3 22Identification marking3 23Ad
13、ditional tests before rejection4 24Condition4 25Certificate of test and examination4 26Testing facilities4 27Inspection4 Appendix A Certificate of test and examination6 Appendix B Requirements for chain testing machines7 Appendix C Safety recommendations for the use, care, and maintenance of chain7
14、Appendix D Energy absorption factor8 1) Test load8 2) Extension8 Appendix E Grading and quality marking8 Appendix F Instruments for measuring the true mean diameter of chain links8 Table 15 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 07:53:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS
15、1663:1950 ii BSI 10-1999 Foreword This British Standard provides for electrically welded steel chain having a higher minimum tensile strength and a greater minimum energy absorption factor than that covered by BS 590, “Mild steel chain, grade 30.” It is recognized that, by the use of alloy steel, ch
16、ain of still higher minimum tensile strength can be made. When, however, such higher tensile strength is accompanied by reduced extension under breaking load, the energy absorption factor (which is the criterion of reliability) may be adversely affected and be lower than that prescribed in this stan
17、dard. By comparison with BS 590, the sizes in this standard (which range from ! in. to 2 in.) have been intentionally restricted. With one exception, there are 1/32 in. sizes below 9/16 in. and no 1/16 in. sizes over 1 in. For sizes not tabulated, the appropriate breaking load, proof load, recommend
18、ed safe working load and energy absorption factor can, when required, be calculated from the formulae given in Table 1 and in the notes to the table. In view of the purposes for which chain is employed and the importance of reliability, it is recommended that supplies should be obtained only from ma
19、nufacturers possessing adequate heat treatment and testing equipment and employing a competent staff for detailed examination. Users are warned that the chain must not be taken as complying with this standard unless the specified tests have been made, and the test requirements obtained, in the prese
20、nce of a person representing or approved by the purchaser. Where the quantity of chain ordered is insufficient to warrant the expense of special inspection it is recommended that the chain should be sent to an independent Test House for the specified tests and examination. For normal conditions of u
21、se the maximum permissible load (safe working load) should not exceed one-half the proof load. When the conditions of working are exceptionally hazardous or severe the permissible working load should be substantially less than one-half the proof load. The maximum safe working loads for normal condit
22、ions of use given in this standard (Column 5 of Table 1) are based on 8 d3 tons, where d is the nominal size of the chain in inches. There are, however, some users whose equipment includes mild steel chain having a safe working load based on 6 d2 tons. These (or other users) may desire to take advan
23、tage of the greater strength of the higher tensile steel chain to obtain an increased factor of safety. Such users are recommended to rate the safe working load of higher tensile steel chain, covered by this standard, also at 6 d2 tons. In addition to short link chain, the standard provides for pitc
24、hed or calibrated load chain for use with pocketed sheaves. Although commonly termed “block chain,” pitched chain is also used for purposes other than in connection with chain pulley blocks. Owing to variation in the design of pocketed sheaves it is impracticable to standardize the proportions of pi
25、tched chain links and this standard provides only for pitched chain having a maximum overall length of link six times the nominal diameter of the steel from which the links are made. With a view to the ultimate standardization of the links for pitched or calibrated electrically welded higher tensile
26、 steel chain, it is recommended that purchasers should adopt and order such chain with links or the following outside dimensions: Length4.90 times the nominal diameter of the steel used. Width3.25 times the nominal diameter of the steel used. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 07
27、:53:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1663:1950 BSI 10-1999iii Users should take all possible steps to ensure ready differentiation between higher tensile steel chain and any other type of chain. The use of some positive system of identification is essential since periodical heat trea
28、tment of higher tensile steel chain is not only unnecessary but might, in fact, be dangerous. It is therefore recommended that, where a chain length is severed (for making into sling legs, or for any other purpose), the identification marking (see Clause 22) stamped on the ends of the length should
29、be stamped upon an idle link or on a tag attached to the sling or other unit. In addition, the presence of the quality marking specified in Clause 8 will provide a definite means of establishing that the chain is of higher tensile steel quality. It is usual trade practice to polish pitched chain, by
30、 “rumbling” in a revolving barrel, to ensure free working with pocketed sheaves. There is at present no evidence that polishing is detrimental to steel chain and this standard does not differentiate, in regard to testing, between polished and unpolished chain, whether short link or pitched. British
31、weights and measures are used throughout this Standard: i.e. 1 ton = 2 240 lb. 1 cwt = 112 lb; linear dimensions are in feet and inches. Corresponding metric weights and measures can be obtained from BS 350, “Conversion factors and tables”. A British Standard does not purport to include all the nece
32、ssary 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 inside front cover, pages i to iv, pages
33、1 to 9 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. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 07:53:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI i
34、v blank Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 07:53:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1663:1950 BSI 10-19991 NOTEThis standard provides alternatives, and the enquiry and order should state whether the chain is to be short link or pitched, whether the chain is required
35、 to be polished or unpolished, whether the length of chain ordered is required to be in one continuous piece, and also, when necessary, the heat treatment required. Section 1. Definitions 1 Size The size of the chain shall be the nominal diameter of the steel from which it is made. 2 Proof load The
36、term “proof load” shall mean the load to which the whole of the chain shall be subjected in the finished condition as specified in Clause 13. 3 Processing The term “processing” shall mean any treatment of the chain subsequent to welding, e.g., heat treatment, polishing, galvanizing or other surface
37、coating. 4 Inspector For the purpose of this standard the term “inspector” shall mean the representative of the purchaser. Section 2. Specification 5 Types of chain British Standard electrically welded higher tensile steel chain shall be either short link or pitched, and shall be supplied polished o
38、r unpolished as agreed between the manufacturer and the purchaser at the time of the enquiry and order. 6 Quality of material The steel used shall be made by the acid or basic open hearth, acid bessemer or electric processes. The carbon content shall not exceed 0.30 per cent. The steel shall contain
39、 not more than 0.05 per cent of sulphur and not more than 0.05 per cent of phosphorus. When so required by the purchaser, the manufacturer shall supply a copy of the steel makers cast analysis. When an analysis of the steel in the chain is required by the purchaser, such analysis shall be made from
40、millings taken from a cross section of a link from the length tested to destruction. The cost of such analysis shall be borne by the purchaser. 7 Heat treatment All chain shall, before proof testing, be subjected to one of the following heat treatments as agreed between the purchaser and the manufac
41、turer: a) Normalizing by heating to a temperature within 50 C, above the upper critical point of the steel used, followed by cooling in still air. b) Heating to a temperature within 50 C, above the upper critical point of the steel used, followed by quenching in oil or water and tempering. Details o
42、f the heat treatment which has been given to the chain in manufacture shall be endorsed on the makers test certificate or Form 86 (see Clause 25 and Appendix A). In the case of chain over 1 inch nominal size, the manufacturer shall, if required, show that the hardness at the centre of the cross sect
43、ion of the material of the link is at least 75 per cent of the hardness of the surface. 8 Quality marking Each twentieth link, or links nt intervals of 3 ft. apart, whichever is the lesser distance, shall be legibly marked as follows: a) Normalized chain with the mark “4” in a circle. b) Quenched an
44、d tempered chain with the mark “04” in a circle. The stamps to be used shall be of the following sizes: The stamps used shall have a concave surface and the indentation shall be neither too sharp nor of excessive depth. 9 Dimensions of links a) Material diameter. The diameter of the section of the f
45、inished link shall be measured by means of calipers or micrometer having one flat contacting surface, the other being a narrow blade shaped in a Vee-groove of 135 angle; suitable instruments are described in Appendix F. For sizes under # in., the diameter so measured shall nowhere differ from the no
46、minal diameter by more than plus 4 per cent or minus 2 per cent. Nominal size of chainDia. of mark in.in. Up to and including 1/2 1/8 Over 1/2 up to and including 1 3/16 Over 1 1/4 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 07:53:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1663:1950
47、 2 BSI 10-1999 For sizes # in. and over, the diameter so measured shall nowhere differ from the nominal diameter by more than plus 6 per cent or minus 2 per cent. The calipers or micrometer shall be calibrated by use on round bars of known diameters covering the range nominal diameter of chain plus
48、10 per cent to minus 10 per cent. The diameter of the steel at the weld shall in no case be less than the diameter of the steel from which the chain is made, or more than 7“ per cent greater. b) Short link chain. The OUTSIDE dimensions of the links shall be as follows: c) Pitched or calibrated chain
49、. The OUTSIDE dimensions of the links shall be as follows: 10 Tolerances on pitched or calibrated chain a) Length. (Measured on chain in finished condition.) The INSIDE length of one link or the sum of the INSIDE lengths of any number of links shall not vary from the nominal length by more than minus 0.005 in., or plus 0.01 Nd + 0.005 in., where b) Width. (Measured on chain in finished condition.) NOTEThe tolerances of length and width in this clause do not apply to replacement chains, see Clause 15. 11 Workmanship The fins caused by welding shall be removed a
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