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1、BRITISH STANDARD BS 4942-3: 1981 ISO 1836:1980 Short link chain for lifting purposes Part 3: Specification for grade M (4) calibrated chain ISO title: Short link chain for lifting purposes Grade M (4), calibrated, for chain hoists and other lifting appliances UDC 621.86.065.4:672.6 Licensed Copy: sh
2、effieldun sheffieldun, na, Fri Dec 01 07:48:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4942-3:1981 This British Standard, having been prepared under the direction of the Mechanical Engineering Standards Committee, was published under the authority of the Executive Board and comes into effect o
3、n 27 February 1981 BSI 09-1999 First published October 1973 First revision February 1981 The following BSI references relate to the work on this standard: Committee reference MEE/12 Draft for comment 78/73172 DC ISBN 0 580 11822 3 Cooperating organizations The Mechanical Engineering Standards Commit
4、tee, under whose direction this British Standard was prepared, consists of representatives from the following: Associated Offices Technical Committee*Department of the Environment (PSA) Association of Consulting EngineersDepartment of Trade (Marine Division) Association of Hydraulic EquipmentDepartm
5、ent of Transport ManufacturersElectricity Supply Industry in England and Association of Mining Electrical andWales* Mechanical EngineersEngineering Equipment Users Association* British Compressed Air SocietyFederation of Manufacturers of Construction British Electrical and Allied ManufacturersEquipm
6、ent and Cranes* Association (BEAMA)Health and Safety Executive* British Gas CorporationInstitution of Gas Engineers British Gear Manufacturers AssociationInstitution of Mechanical Engineers British Internal Combustion EngineInstitution of Plant Engineers Manufacturers AssociationInstitution of Produ
7、ction Engineers British Pump Manufacturers AssociationLloyds Register of Shipping British Steel Corporation*London Transport Executive British Steel IndustryMachine Tool Industry Research Association British Valve Manufacturers Association Ltd.Ministry of Defence* CbmpeNational Coal Board* Chartered
8、 Institution of Building ServicesOil Companies Materials Association Crown Agents for Oversea Governments andProcess Plant Association AdministrationsTelecommunication Engineering and Department of Industry MechanicalManufacturing Association (TEMA) Engineering*The Society of Motor Manufacturers and
9、 Department of Industry NationalTraders Limited Engineering Laboratory* The organizations marked with an asterisk in the above list, together with the following, were directly represented on the Technical Committee entrusted with the preparation of this British Standard: British Ports AssociationMac
10、hine Made Chain Manufacturers British Railways BoardAssociation Chain Testers Association of Great BritainMinistry of Aviation Supply Corporation of Trinity HouseNational Association of Drop Forgers and Department of Industry National PhysicalStampers LaboratoryIndividual Technical Experts Federatio
11、n of Civil Engineering Contractors Federation of Wire Rope Manufacturers of Great Britain Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 07:48:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4942-3:1981 BSI 09-1999i Contents
12、Page Cooperating organizationsInside front cover National forewordii 1Scope and field of application1 2References1 3Definitions1 4General conditions of acceptance1 5Dimensions1 6Material and manufacture2 7Test requirements2 8Inspection2 9Marking2 10Test certificate2 Annex Temporary additional sizes
13、Grade M (4), calibrated7 Figure 1 Material and weld tolerances3 Figure 2 Chain and link dimensions4 Table 1 Examples2 Table 2 Dimensions of grade M (4) calibrated chain5 Table 3 Mechanical properties6 Table 4 Grade M (4), calibrated, test requirements and working load limits6 Table 5 Dimensions7 Tab
14、le 6 Grade M (4), calibrated, test requirements and working load limits for chains in Table 5 (Temporary additional sizes)8 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 07:48:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4942-3:1981 ii BSI 09-19
15、99 National foreword This Part of this British Standard, published under the direction of the Mechanical Engineering Standards Committee, forms one of a series on lifting chain and is identical with ISO 1836 “Short link chain for lifting purposes Grade M (4) Calibrated, for chain hoists and other li
16、fting appliances” published in 1980 by the International Organization for Standardization (ISO). The United Kingdom has taken part in the preparation of the International Standard through Subcommittee 1 of Technical Committee 111, Round steel link chains, chain wheels, lifting hooks and accessories.
17、 This Part of this standard is a revision of BS 4942-3:1973, which was related to ISO/R 1836:1971 although the text was not identical. The 1973 edition of BS 4942-3 is withdrawn with publication of this revision. It is also intended that this Part of this standard will in due course supersede BS 166
18、3:1950 “Higher tensile steel chain Grade 40 (short link and pitched or calibrated) for lifting purposes”. Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain convention
19、s are not identical with those used in British Standards; attention is especially drawn to the following. The comma has been used throughout as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. Wherever the words “International S
20、tandard” appear referring to this standard they should be read as “British Standard”. Additional information. It will be noted that clause 9 requires a quality mark to be applied and alternative marks are permitted i.e. “M” or “4”. Manufacturers are recommended to adopt the mark “M” as the quality m
21、ark for this grade of chain, in order to align with the marking of other materials and components in this grade. The use of either “M” or “4” as the quality mark is however acceptable for compliance with this British Standard. Cross-references International StandardCorresponding British Standard ISO
22、 388:1964BS 4391:1972 Recommendations for metric basic sizes for metal wire (Technically equivalent) ISO/R 643:1967BS 4490:1969 Methods for the determination of austenitic grain size of steel (Technically equivalent) ISO 1035-1:1969BS 4229 Recommendations for metric sizes of ferrous and non-ferrous
23、bars Part 2:1969 Ferrous bars (Technically equivalent) ISO 1834:1980BS 4942 Short link chain for lifting purposes Part 1:1981 Specification for general conditions of acceptance (Identical) Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 07:48:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4
24、942-3:1981 BSI 09-1999iii 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 legal obligations. Summary of page
25、s This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 8, 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. L
26、icensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 07:48:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 07:48:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4942-3:1981 BSI 09-19991 1 Scope and field of application This Internationa
27、l Standard specifies requirements for lifting chains, grade M (4), accurately calibrated for use as load chains in chain hoists and similar appliances. These are electrically welded round steel short link chains fully heat treated and tested, and comply with the general conditions of acceptance of I
28、SO 1834. The range of sizes covered by this International Standard is from 5 to 32 mm. The Annex gives a range of temporary additional sizes 6 to 46 mm. 2 References ISO/R 388, ISO metric series for basic thicknesses of sheet and diameters of wire. ISO/R 643, Micrographic determination of the austen
29、itic grain size of steels. ISO 1035-1, Dimensions of hot rolled steel bars Part 1: Round bars Metric series1). ISO 1834, Short link chain for lifting purposes General conditions of acceptance. 3 Definitions For the purposes of this International Standard the definitions given in ISO 1834 apply. 4 Ge
30、neral conditions of acceptance The chain shall comply fully with the requirements of ISO 1834 as well as those of this International Standard. 5 Dimensions 5.1 Size of chain (see ISO 1834, clause 4, “Definitions”) The size of chain shall be one of the sizes listed in Table 2, column 1 corresponding
31、to the nominal diameter (dn) of the steel wire (ISO/R 388) or bar (ISO 1035-1) from which the chain is made. NOTEControl over the size of the material (bar or wire) from which the chain is made is important but this International Standard concerns finished chain and must assume that the inspector ma
32、y not have the opportunity of retrospective measurement of the original material. The chain manufacturer will realize the need for the size of this material to be kept within accepted tolerances. 5.2 Material diameter (see ISO 1834 for definition of material diameter and method of measurement) 5.2.1
33、 Tolerance on material diameter For sizes less than 18 mm the diameter d of the material in the finished link shall nowhere differ from the nominal diameter by more than %, except at the weld. For sizes 18 mm and over, the diameter d of the material in the finished link shall nowhere differ from the
34、 nominal diameter by more than 5 %, except at the weld. 5.2.2 Tolerances at the weld The dimension of the steel at the weld shall nowhere be less than the diameter d of the steel adjacent to the weld, or exceed it by more than the following tolerances. (See Figure 1 and Table 2.) Type 1: 8 % of the
35、nominal diameter in any direction; Type 3: 8 % of the nominal diameter in the direction perpendicular to the plane of the link and 17 % in other planes. 5.2.3 Area affected dimensionally by welding The area affected dimensionally by welding shall not extend by more than 0,6 of the material diameter
36、to either side of the centre of the link. 5.3 Length and width (see Figure 2 and Table 2) 5.3.1 Nominal dimensions Preferred nominal dimensions are as follows: Pitch p (i.e. inside length): 3 times the nominal chain size (dn); Outside width w: 3,25 times the nominal chain size (dn). Where the chain
37、has to fit a load wheel designed for different dimensions, the nominal pitch (inside length) and the nominal outside width shall be clearly specified at the time of the enquiry and order. 5.3.2 Tolerances 5.3.2.1 Outside width w (measured on the chain in the finished condition) The outside width, w,
38、 measured clear of the weld zone is given by the formula w = nominal outside width, 5.3.2.2 Length (measured on the chain in the finished condition) The inside length of one link or the sum L of the inside lengths of any number of links N measured bearing to bearing under a force not greater than ha
39、lf the specified proof force of the chain, shall not vary from the nominal length (Np) by more than the following percentage tolerance: 1) At present at the stage of draft. (Revision of ISO/R 1035-1:1969.) + 2 6 + 0,075 dn 0 % L Np - -100 + 1,6/N0,33+() 0 %= Licensed Copy: sheffieldun sheffieldun, n
40、a, Fri Dec 01 07:48:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4942-3:1981 2 BSI 09-1999 Table 1 Examples 6 Material and manufacture 6.1 Quality of material The steel shall be produced by the open hearth or electric process or by an oxygen blown process. In its finished state as supplied to th
41、e chain maker it shall meet the following requirements as determined by check analysis on the rod, wire or finished link. It shall be fully killed, shall possess reliable welding quality and when heat treated, be capable of producing in the finished chain the mechanical properties required by this s
42、pecification. Its content of sulphur and phosphorus shall be restricted as follows: The steel shall be made in conformity with fine grain practice to give an austenitic grain size of five or finer when tested in accordance with ISO/R 643. This could be accomplished, for example, by ensuring that it
43、contains sufficient aluminium or an equivalent element to permit the manufacturer of chain stabilized against strain age embrittlement during service; a minimum value of 0,02 % metallic aluminium is given for guidance. Within the above limitations it is the responsibility of the chain maker to selec
44、t steels so that the finished chain, suitably heat treated, meets the mechanical properties specified in this International Standard. 6.2 Heat treatment All chain shall be normalized or hardened and tempered before being subjected to the proof force. 6.3 Proof force The proof force shall be as speci
45、fied in Table 4, column 2 or Table 6, column 2 and shall be applied as specified in ISO 1834. 7 Test requirements 7.1 Mechanical properties and test forces The mechanical properties shall be as specified in Table 3 and the test forces to be applied for each size are specified in Table 4 and Table 6.
46、 7.2 Selection of samples Samples shall be selected as specified in ISO 1834. The length of the lot from which the inspector selects the samples shall be 200 m or lesser length. 7.3 Static tensile test 7.3.1 Testing machine and method The testing machine and method of testing shall be as specified i
47、n ISO 1834. 7.3.2 Tensile test The breaking force shall be not less than that specified in Table 4, column 3 or Table 6, column 3. 7.3.3 Total ultimate elongation The total ultimate elongation as defined in ISO 1834 shall be not less than 17 %. 8 Inspection 8.1 Provision for inspection The provision
48、 for inspection shall be as specified in ISO 1834. 8.2 Acceptance The acceptance procedure shall be as specified in ISO 1834. 9 Marking 9.1 Quality marking The quality mark for the chain is M or 4. It shall be applied as specified in ISO 1834. 9.2 Identification marking The identification marking sh
49、all be as specified in ISO 1834. 9.3 Inspection marking The inspection marking shall be as specified in ISO 1834. 10 Test certificate The manufacturer shall, if required, supply a certificate of test and examination with every supply of chain containing the information detailed in ISO 1834. A typical form is given in ISO 1834, Annex C. Nominal size dn Number of links in chain N Tolerance (+ only) mm%mm 6,3 1 5 21 1,93 0,65 0,406 0,37 0,61 1,61 10 1 5 21 1,93 0,65 0,406 0,58 0,975 2,56 20 1 5 21 1,93 0,65 0,406 1,16 1,95 5