1、BRITISH STANDARD BS 2969:1980 ISO 610:1979 Specification for High-tensile steel chains (round link) for chain conveyors and coal ploughs UDC 622.232 + 622.647:621.867.1:672.631:669.14.018.295BS2969:1980 This British Standard, having been prepared under the directionof the Mining and Quarrying Requis
2、ites StandardsCommittee, was published under the authority ofthe Executive Board and comesinto effect on 28November 1980 BSI 12-1999 First published March 1958 First revision March 1969 Second revision The following BSI references relate to the work on this standard: Committee reference MQE/6 Draftf
3、or comment 78/72374 DC ISBN 0 580 11386 8 Cooperating organizations The Mining and Quarrying Requisites Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following Government department and scientific and industrial organizations: Ass
4、ociation of British Mining Equipment Companies* Association of Mining Electrical and Mechanical Engineers Council for Electrical Equipment for Flammable Atmospheres (BEAMA) Engineering Equipment Users Association Health and Safety Executive* Institute of Quarrying Institution of Mechanical Engineers
5、 Institution of Mining and Metallurgy Institution of Mining Engineers* Mechanical Handling Engineers Association National Coal Board* The organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of
6、 this British Standard: British Steel Industry Machine Made Chain Manufacturers Association Amendments issued since publication Amd. No. Date of issue CommentsBS2969:1980 BSI 12-1999 i Contents Page Cooperating organizations Inside front cover National foreword ii 1 Scope and field of application 1
7、2 References 1 3 Definitions 1 4 Dimensions of chains 2 5 Material and manufacture 4 6 Test requirements 5 7 Inspection procedure 11 Annex A Force-extension diagram 14 Annex B Multiple pitch lengths with tolerances 15 Annex C Typical examples of matching tolerances for matched lengthsoflongchain 15
8、Annex D Information required with enquiry or order 16 Annex E Fatigue test statistical analysis 17 Annex F Notch impact test 19 Figure 1 Dimensions of chains 2 Figure 2 Chain link dimensions 2 Figure 3 Chain anchorage for static tensile test 8 Figure 4 Anchorage pin 9 Figure 5 Anchorage fork 10 Figu
9、re 6 Bend test 12 Figure 7 Force-extension diagram (illustration of terms) 14 Figure 8 Matched lengths 15 Figure 9 Fatigue life/probability diagram Reference standard chain 18 Figure 10 Source of test pieces 19 Table 1 Chain link dimensions and mass 3 Table 2 Content of sulphur and phosphorus 4 Tabl
10、e 3 Mechanical properties Basic table 6 Table 4 Mechanical properties Specified test forces 6 Table 5 Gauge length and setting force 8 Table 6 Fatigue test Anchorage pin dimensions 11 Table 7 Fatigue test Lower and upper stress levels (approximate) 11 Table 8 Fatigue test Lower and upper force level
11、s 11 Table 9 Bend test Deflection 12 Table 10 Multiple pitch lengths 15 Table 11 Matched lengths 16 Publications referred to Inside back coverBS2969:1980 ii BSI 12-1999 National foreword This British Standard is identical with ISO 610:1979 “High-tensile steel chains (round link) for chain conveyors
12、and coal ploughs”, including the Erratum issued15 May 1980, and is published under the direction of the Mining and Quarrying Requisites Standards Committee. The United Kingdom has taken part in the preparation of the International Standard through Sub-Committee 2 of Technical Committee 82 of the Int
13、ernational Organization for Standardization (ISO). This standard supersedes the previous issue of BS 2969:1969 “Calibrated high tensile steel chain (round link) for coal face machines and conveyors”, which is now withdrawn. Terminology and conventions. The text of the International Standard has been
14、 approved as suitable for publication, without deviation, as a British Standard. Some terminology and certain conventions 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 Standar
15、ds it is current practice to use a full point on the baseline as the decimal marker. Wherever the words “International Standard” appear, referring to this standard, they should be read as “British Standard”. A British Standard does not purport to include all the necessary provisions of a contract. U
16、sers of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International Standard Corresponding British Standard ISO 83:1976 BS 131 Methods for notched bar tests Part 3:1972 T
17、he Charpy U-notch impact test on metals (Technically equivalent) ISO/R 147:1960 BS 1610:1964 Methods for the load verification of testing machines (Technically equivalent) ISO/R 643:1967 BS 4490:1969 Methods for the determination of the austenitic grain size of steel (Technically equivalent) Summary
18、 of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to20, 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 co
19、ver.BS2969:1980 BSI 12-1999 1 1 Scope and field of application This International Standard specifies the requirements for a range of high grade special purpose calibrated, high-tensile, electrically welded, steel chains (round link) for use with machines and equipment in mining, such as the followin
20、g: a) conveyors, flexible and rigid, of the chain type, chain belt conveyors, gate end and stage loaders; b) coal ploughs, coal cutters and power loaders; c) bucket elevators; d) other similar machines used in mines. This International Standard covers a size range from 14 to 30 mm. Three grades of q
21、uality (B, C andD) are specified with regard to the mechanical properties of chain. The values given for grade D in Table 3, Table 4, Table 7 and Table 8 are, however, provisional. Chains covered by this International Standard are not designed for lifting appliances, such as cranes and slings. 2 Ref
22、erences ISO 83, Steel Charpy impact test (U-notch). ISO/R 147, Load calibration of testing machines for tensile testing of steel. ISO/R 643, Micrographic determination of the austenitic grain size of steels. 3 Definitions For the purposes of this International Standard, the following definitions app
23、ly: 3.1 size of chain the nominal diameter d of the steel wire or bar from which the chain is made 3.2 breaking force the maximum force which a sample of finished chain withstands during the course of a tensile test to destruction 3.3 test force the specified force to which a sample of the finished
24、chain has to be subjected without exceeding the stated elongation 3.4 proof force the specified force to which, after processing (see3.6), the whole of the chain has to be subjected without significant permanent deformation or damage this force may be re-applied to the whole of the new chain or to a
25、ny part thereof by the purchaser or by his inspector at their discretion 3.5 percentage elongation the extension expressed as a percentage of the gauge length 3.6 processing any treatment of the chain subsequent to welding, for example heat treatment, calibration or surface treatment 3.7 calibration
26、 the application of force to the whole of the chain during the production process to control the link dimensionsBS2969:1980 2 BSI 12-1999 3.8 elastic limit the maximum force which can be applied to the chain without producing permanent deformation 3.9 setting force the force applied to hold the samp
27、le under tension while the gauge length is marked and/or the extensometer is fitted NOTEOther technical terms are illustrated in the force-extension diagram given in Annex A. 3.10 inspector the representative of the purchaser 4 Dimensions of chains The dimensions of chains shall be as shown in Figur
28、e 1 and Figure 2 and Table 1. Figure 1 Dimensions of chains Figure 2 Chain link dimensionsBS2969:1980 BSI 12-1999 3 Table 1 Chain link dimensions and mass 4.1 Material diameter 4.1.1 Diameter of material in the link The diameter d of the material in the link (except at the weld) shall be as stated i
29、n column 1 of Table 1, subject to the tolerance shown in column 2. The tolerance on the diameter of material in the link shall be applied to the average of two diameters measured at right angles in the same section. 4.1.2 Weld diameter The diameter of the weld d 1shall be not less than the actual di
30、ameter of the steel adjacent to the weld, nor shall it exceed the diameter stated in column 10 of Table 1. The weld offset c shall not exceed the actual diameter of the wire by more than the value stated in column9of Table 1, and shall not be below the surface of the wire. 4.1.3 Position and extent
31、of weld The weld or welds shall be positioned equidistant about the centre of one or both legs of the link. The area affected dimensionally by welding shall not exceed the value given in column 11 of Table 1. 4.2 Pitch The nominal pitch p of the link shall be as stated in column 3 of Table 1, and sh
32、all be subject to the tolerances shown in column 4 of that table. 4.3 Width of link 4.3.1 Inside width The minimum inside width a of the link shall be as shown in column 5 of Table 1, except at the weld. 4.3.2 Outside width The maximum outside width b of the link shall be as shown in column 6 of Tab
33、le 1, except at the weld. 4.4 Length of link The nominal length l 1of the link shall be as stated in column 7 of Table 1 and shall be subject to the tolerances stated in column 8 of that table. This is the theoretical length of the link and may be greater than the actual overall length due to flatte
34、ning during manufacture. Dimensions in millimetres 1 2 3 4 5 6 7 8 9 10 11 12 Diameter of material in the finished link Pitch Width Length Weld Mass per unit length Nominal diameter Tolerance Nominal Tolerance Inside Outside Nominal Tolerance Allowable offset Diameter Length . d p a min. b max. l 1c
35、 max. d 1max. e kg/m 14 0,4 50 0,5 17 48 78 0,4 15 10 4,0 18 0,5 64 0,6 21 60 100 0,5 19,5 13 6,6 22 0,7 86 0,9 26 74 130 0,7 23,5 15,5 9,5 24 0,8 86 0,9 28 79 134 0,7 26 17 11,6 24 0,8 87,5 0,9 28 79 135,5 0,7 26 17 11,5 26 0,8 92 0,9 30 86 144 0,8 28 18 13,7 30 0,9 108 1,0 34 98 168 0,9 32,5 21 18
36、,0 + 0,5 1,3 + 0,6 1,6 + 0,9 2,3 + 0,9 2,5 + 0,9 2,5 + 0,9 2,5 + 1,0 2,8BS2969:1980 4 BSI 12-1999 4.5 Multiple pitch length 4.5.1 Nominal multiple pitch length The nominal multiple pitch length l (see Figure 1 and Annex B, Annex C and Annex D) is the nominal pitch of the chain multiplied by the numb
37、er of links specified. The number of links per length (being an odd number) shall be stated at the time of ordering. 4.5.2 Tolerance on actual multiple pitch length The actual multiple pitch length of the chain shall be measured on the chain in the finished condition under the setting force stated i
38、n Table 5 (See 6.5.3.) The length so measured shall not vary from the sum of nominal inside lengths (i.e. pitches) of the individual links by more than where 4.6 Matching of lengths Where chain is required in short lengths having a specified number of links for use in double or triple chain conveyor
39、s, it shall be ordered and supplied in “matched lengths”. When measured under the setting force stated in Table 5, the difference between any two matched lengths shall not be greater than: a) for lengths up to 2 m: 0,10 % of the multiple pitch length; b) for lengths greater than 2 m: 0,15 % of the m
40、ultiple pitch length. If the purchaser requires chain with tighter matching tolerances, they shall be the subject of special agreement between the purchaser and the manufacturer. An example of tighter matching tolerances is given in Annex C. 4.7 Mass The approximate mass per metre of single chain ca
41、lculated on nominal dimensions is stated in column 12 of Table 1. 5 Material and manufacture 5.1 Quality of material The chain shall be made from steel which in its finished state as supplied to the chain manufacturer, shall meet the following requirements: a) The steel shall be fully killed and sha
42、ll possess reliable welding properties. b) The content of sulphur and phosphorus shall be as shown in Table 2. Table 2 Content of sulphur and phosphorus c) The steel shall be of such composition as to guarantee the mechanical properties of the chain after appropriate heat treatment. For grades C and
43、 D, an alloy steel containing alloying elements (such as nickel, chromium and molybdenum) shall be used. Care shall be exercised in the choice of steel so that the achievement of high ultimate tensile stress in the material does not result in the disproportionate loss of other properties, particular
44、ly notch toughness. p is the nominal pitch, n is the specified number of links. Element Cast analysis Check analysis Quality B Qualities Cand D Quality B Qualities Cand D Sulphur, max. 0,040 % 0,030 % 0,045 % 0,035 % Phosphorus, max. 0,035 % 0,030 % 0,040 % 0,035 %BS2969:1980 BSI 12-1999 5 d) The st
45、eel shall be made in conformity with finegrain practice to give an austenitic grain sizeof 5 or finer when tested in accordance with ISO/R 643. This could be accomplished, for example, by ensuring that it contains sufficient aluminium or equivalent element to allow the manufacture of chain stabilize
46、d against strain age embrittlement during service; a minimum value of 0,020 % metallic aluminium is quoted for guidance, and to safeguard weldability, a maximum of 0,055 %. For grade B chain, however, this may be slightly relaxed, a grain size of 4 being acceptable. Within the above limitations it s
47、hall be the responsibility of the chain maker to select the steel so that the finished chain, suitably heat treated, possesses the specified mechanical properties. The steel wire or bar used for the links shall be cleanly finished and shall be free from harmful flaws and surface defects. If requeste
48、d by the purchaser, the following information shall be supplied: 1) the method of steel manufacture and the steelmakers cast analysis; 2) an analysis of steel millings taken from, and representative of, a link which formed part of a length tested to destruction. 5.2 Heat treatment Chain complying wi
49、th this International Standard shall be heat treated in the course of manufacture. Heating to an appropriate temperature above the critical point (AC 3 ) of the steel used shall form part of such heat treatment. 5.3 Workmanship Fins caused by welding shall be removed and welds shall be smoothly finished. Any links which on visual examination show detrimental fissures, notches or similar faults shall be rejected unless the faults can be rectified by means agreed be
