1、July 2012DEUTSCHE NORM English price group 11No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 53.040.20!%F b) nomina
2、l size 42 137 has been included; c) Grade 1 has been omitted; d) hardness testing has been included; e) bases for calculation have been included; f) the standard has been revised in form and substance. Previous editions DIN 22252: 1951-03, 1956-10, 1964-05, 1983-09, 1993-01, 2001-09 DIN 22252-1: 197
3、3-12 DIN 22252-2: 1973-12 DIN 22252:2012-07 4 1 Scope This standard applies to round steel link chains subjected to traction in chain conveyors, bucket elevators and winning equipment, preferably in mining operations. The standard specifies requirements for the design, selection of materials, test m
4、ethods and working forces. Round steel link chains according to this standard shall not be used as lifting accessories, slings or loadbearing devices within the meaning of DIN 15003. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and
5、are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. DIN 15003, Lifting appliances Load suspension devices, loads and forces Definitions DIN 17115, Steels
6、 for welded round link chains and chain components Technical delivery conditions DIN 22253, Chain connectors Shackle type connectors Dimensions, requirements, testing DIN 50100, Testing of materials Continuous vibration test Definitions, symbols, procedure, evaluation DIN 51220, Materials testing ma
7、chines Generals for requirements and for verification and calibration of materials testing machines DIN EN 10204, Metallic products Types of inspection documents DIN EN ISO 148-1, Metallic materials Charpy pendulum impact test Part 1: Test method DIN EN ISO 148-2, Metallic materials Charpy pendulum
8、impact test Part 2: Verification of testing machines (pendulum impact testers) DIN EN ISO 148-3, Metallic materials Charpy pendulum impact test Part 3: Preparation and characterization of Charpy V-notch test pieces for indirect verification of pendulum impact machines (pendulum impact testers) DIN E
9、N ISO 6506-1, Metallic materials Brinell hardness test Part 1: Test method DIN EN ISO 6506-2, Metallic materials Brinell hardness test Part 2: Verification and calibration of testing machines DIN EN ISO 6506-3, Metallic materials Brinell hardness test Part 3: Calibration of reference blocks DIN EN I
10、SO 6507-1, Metallic materials Vickers hardness test Part 1: Test method DIN EN ISO 6507-2, Metallic materials Vickers hardness test Part 2: Verification and calibration of testing machines DIN EN ISO 6507-3, Metallic materials Vickers hardness test Part 3: Calibration of reference blocks DIN EN ISO
11、7500-1, Metallic materials Verification of static uniaxial testing machines Part 1: Tension/compression testing machines Verification and calibration of the force-measuring system DIN EN ISO 7500-1 Supplement 1, Metallic materials Verification of static uniaxial testing machines Part 1: Tension/comp
12、ression testing machines Verification and calibration of the force-measuring system Supplement 1: General for requirements, verification and calibration of tension, compression and flexion testing machines DIN 22252:2012-07 5 DIN EN ISO 7500-1 Supplement 3, Metallic materials Verification of static
13、uniaxial testing machines Part 1: Tension/compression testing machines Verification and calibration of the force-measuring system Supplement 3: General information for requirements, verification and calibration of fatigue testing machines DIN EN ISO 18265, Metallic materials Conversion of hardness v
14、alues 3 Terms, definitions and symbols For the purposes of this document, the following terms, definitions and symbols apply: 3.1 nominal size d t nominal diameter and nominal pitch of the round steel link chain 3.2 nominal diameter d material diameter in the leg area adjacent to the weld as a nomin
15、al value 3.3 weld diameter dsdiameter at the weld 3.4 weld length a length of the area dimensionally affected by the welding 3.5 nominal pitch t internal length of a round steel chain link as a nominal value 3.6 internal width b1clear width of a round steel chain link adjacent to the weld and the op
16、posite leg 3.7 external width b2overall external dimension of a round steel chain link adjacent to the weld 3.8 test force TF force at which the elongation at test force is measured during the static tensile test DIN 22252:2012-07 6 3.9 breaking force BF maximum force which a sample of a round steel
17、 link chain withstands during the course of a static tensile test until fracture occurs 3.10 working force WF maximum static force which the round steel link chain is designed to withstand in operation 3.11 elongation at test force the relation of the total extension of the sample at test force to t
18、he gauge length under measuring force 3.12 ultimate elongation A the relation of the total extension of the sample after fracture to the gauge length 5 t of the unloaded sample 3.13 lot size specified quantity from which the sample(s) is/are selected 3.14 lower force Fulower force to be applied duri
19、ng the fatigue test 3.15 upper force Foupper force to be applied during the fatigue test 4 Dimensions, designation and order details Figure 1 Chain strand DIN 22252:2012-07 7 Key x area to be tested Figure 2 Chain link Designation of a round steel link chain according to DIN 22252 of nominal size 30
20、 108 with a length tolerance according to Table 1: Chain DIN 22252 30 108 1 Order details for 5 chain strands, each with 925 chain links of a round steel link chain according to DIN 22252 of nominal size 30 108 with a length tolerance according to Table 1: 5 925 chain links DIN 22252 30 108 1 Order
21、details for 12 chain strands, each with 695 chain links of a round steel link chain according to DIN 22252 of nominal size 26 92 with a length tolerance according to Table 2: 12 695 chain links DIN 22252 26 92 2 Order details for 1 000 chain strands, each with 11 chain links of a round steel link ch
22、ain according to DIN 22252 of nominal size 22 86 with a length tolerance according to Table 3: 1 000 11 chain links DIN 22252 22 86 3 DIN 22252:2012-07 8 Table 1 Dimensions and masses Dimensions in millimetres Nominal size Nominal diameter Nominal pitch Width Radius Mass per metre Gauge length Inter
23、nal External r d t d Toler-ances t Toler-ances b1b25 t Toler-ances min. max. min. max. kg/m 14 50 14 0,4 50 0,5 17 48 22 24 4 250 18 64 18 0,5 64 0,6 21 60 28 30 6,6 320 19 64,5 19 0,6 64,5 22 63 29,5 31,5 7,4 322,5 22 86 22 0,7 86 0,9 26 73 34,5 36,5 9,5 430 1,0 24 86 24 86 28 79 37,5 39,5 11,6 430
24、 24 87,5 24 87,5 28 79 37,5 39,5 11,5 437,5 26 92 26 0,8 92 30 85 40 42,5 13,7 460 30 108 30 0,9 108 1,1 34 97 46 48,5 18 540 1,1 34 126 34 1,0 126 1,3 38 110 52 55 22,7 630 1,3 38 137 38 1,1 137 1,4 42 122 58 61 29 685 1,4 42 137 42 137 1,4 48 139 65 69,5 36,9 685 1,4 Table 2 Matched long chain str
25、ands; gauge lengths and tolerances Dimensions in millimetres Nominal size Gauge length Length laof chain strand Number of chain links Tolerance Tolerances d t n n t l 5 000 l 5 000 22 86 11 946 1,5 + 2 0 +0,000 4 l 0 24 86 11 946 24 87,5 11 962,5 26 92 9 828 30 108 9 972 34 126 7 882 38 137 7 959 42
26、 137 5 685 aAn odd number of chain links is required. The gauge lengths and tolerances in Table 2 apply to matched long chain strands. DIN 22252:2012-07 9 Table 3 Matched short chain strands; gauge lengths and tolerances Dimensions in millimetres Nominal size Number n of chain links Width Radius 5 7
27、 9 11 13 15 Internal External d t Gauge length n t b1b2r + 2 0 + 2 0 1 1 1 1 min. max. + 2 0 14 50 450 550 650 750 17 48 22 18 64 448 576 704 832 960 22 61 28,5 19 64,5 451,5 580,5 709,5 838,5 967,5 23 65 30,5 22 86 430 602 774 946 27 75 35,5 24 86 30 82 39 24 87,5 437,5 612,5 787,5 962,5 30 82 39 2
28、6 92 460 644 828 1 012 32 88 42 30 108 540 756 972 37 102 49 34 126 630 882 1 134 42 116 56 The gauge lengths and tolerances in Table 3 apply to matched short chain strands in combination with shackle-type connectors according to DIN 22253. The information from Table 1 applies to all other dimension
29、s with the exception of b1, b2and r. 5 Requirements 5.1 Material Round steel link chains shall be manufactured from a material selected by the manufacturer to comply with the requirements of this standard (at least 23 MnNiCrMo5-2, material No. 1.6541 according to DIN 17115). Materials with deviating
30、 chemical compositions shall be agreed when placing the order. 5.2 Manufacture The weld shall be produced by a resistance-butt or flash-butt welding process and shall be positioned in the centre of a leg of the link. The weld shall be smoothly finished all round. 5.3 Heat treatment The complete roun
31、d steel link chain shall be hardened from a temperature range above the Ac3point with subsequent tempering in order to fulfil the specified mechanical properties. 5.4 Hardness Hardness 350 HV10 to 390 HV10 / 345 HBW10/3000 to 385 HBW10/3000 (ISO 18265 conversion 1 097 MPa to 1 220 MPa B.2 HV/HB). De
32、viating hardness values are possible for special types of round steel link chains and shall be agreed. DIN 22252:2012-07 10 5.5 Dimensions After completion of the production process of the round steel link chains, the dimensions shall be within the tolerances specified in Table 1. In addition to Tab
33、le 1, Table 2 also applies to matched long chain strands (twin-inboard chains). The values from Table 3 which deviate from Table 1 apply to matched short chain strands (outboard chains). The weld diameter dsshall not be more than 2 % less than the diameter measured adjacent to the weld and shall not
34、 exceed it by more than 3 %. The weld length a shall not exceed the dimension 0,7 d. 5.6 Mechanical properties After heat treatment, the complete round steel link chain shall be subjected to a manufacturing proof force which corresponds to at least the values of the test force TF specified in Table
35、4. The upper limit of the manufacturing proof force shall not exceed the test force value TF by more than 15 %. The elongation at test force shall not exceed the value specified in Table 4. The breaking force BF shall reach at least the values specified in Table 4. The ultimate elongation A shall no
36、t be less than the value specified in Table 4. The bend deflection f shall not reveal any cracks or other visible defects. For round steel link chains of nominal size 26 mm with a tensile strength of 1 097 MPa Rm 1 220 MPa, the base material in the leg and in the curve of non-aged normal samples wit
37、h a V-notch shall exhibit a notched-bar impact energy of 57 J at room temperature as the average value of three samples per material batch used, whereby none of the individual values shall be below 70 % of the stipulated average value (40 J). In the fatigue test, at least 70 000 cycles shall be achi
38、eved per sample under the forces specified in Table 5. Table 4 Nominal size-dependent mechanical properties and working forces Nominal size Test force Elongation at test force Breaking force Ultimate elongation Bend deflection Working force d t TF BF A f WF kN % max. kN min. % min. mm kN max. 14 50
39、185 246 14 154 18 64 305 407 18 254 19 64,5 340 454 19 283 22 86 456 608 22 380 24 86 543 724 24 452 24 87,5 543 1,6 724 14 24 452 26 92 637 850 26 531 30 108 848 1 130 30 707 34 126 1 090 1 450 34 907 38 137 1 360 1 820 38 1 130 42 137 1 660 2 220 42 1 380 DIN 22252:2012-07 11 Table 5 Fatigue test;
40、 lower force, upper force Nominal diameter Lower force Upper force d FuFokN kN 14 15 77 18 26 127 19 29 142 22 38 190 24 46 226 26 53 266 30 71 354 34 91 454 38 114 567 42 139 693 5.7 Surface condition The round steel link chains are supplied with the surface condition created by the heat treatment.
41、 Any deviating surfaces shall be agreed when placing the order. The round steel link chains shall be free from surface cracks and notches which impair their usability. 6 Tests 6.1 General The tests shall be carried out following a visual assessment of the total quantity. With the exception of the di
42、mension test, these tests will be destructive component tests on samples of the finished round steel link chains taken lot by lot with a natural black surface finish. Due to the change in friction behaviour in the interlink contact area of corrosion-protected or bright round steel chain links, the b
43、reaking force values and ultimate elongation values shall be deemed to meet the requirements if the breaking force is at least 90 % and the ultimate elongation is at least 80 % of the respective values for the natural black round steel link chain of the same nominal size. The scope of tests covers t
44、he dimension test according to 6.4, the tensile test according to 6.5, the bending test according to 6.6 and the hardness test according to 6.7. Any further tests, such as the pendulum impact test according to 7.1 or fatigue test according to 7.2, shall be agreed when placing the order. 6.2 Lot size
45、 A single lot comprises a manufacturing unit of 100 m or 100 chain strands provided these are not longer than 1 m. Any started manufacturing unit is deemed to be a single lot. DIN 22252:2012-07 12 6.3 Sampling 6.3.1 The samples for the tensile test, the bending test, the pendulum impact test, the fa
46、tigue test and hardness test are to be taken from the ends of the chain strands. The samples shall be dry and free from grease. 6.3.2 For the dimension test on the individual round steel chain link, three links shall be randomly selected from a single lot. For the dimension tests on matched short ch
47、ain strands according to Table 3, one chain strand shall be randomly selected from a single lot. 6.3.3 For the tensile test, one sample shall be taken from each lot, so that five round steel chain links are subjected to the tensile loading after being clamped. 6.3.4 For the bending test, two individ
48、ual round steel chain links shall be taken from each lot. 6.3.5 For the hardness test, one round steel chain link shall be taken from the total quantity manufactured. 6.3.6 For the pendulum impact test, three individual round steel chain links shall be taken from five lots. 6.3.7 For the fatigue test, three samples shall be selected from five lots. They shall be of sufficient length to ensure that, after clamping, each of the three round steel chain links can be subjected to the fatigue stress. 6.4 Dimension test 6.4.1 Testing of the round steel chain links T
