1、ICs 53.020.30 Descriptors: Steel, chains, grade 2, requirements. Supersedes June 1980 edition Rundstahlketten - Gteklasse 2, nicht lehrenhaltig, geprft In keeping with current practice in standards published by the International Organization for Standardization (ISO), a comma has been used throughou
2、t as the decimal marker. Clauses 7 and 8 of this standard include safety requirements within the meaning of the Geratesicherheits- gesetz (German Equipment Safety Law). Foreword This standard has been prepared by the Normenausschu Rundstahlketten (Round Steel Link Chains Standards Committee), Techni
3、cal Committee Anschlagketten und Zubehr, in cooperation with the Norddeutsche Metall-Berufsgenossenschaft. Amendments The following amendments have been made to the June 1980 edition. a) The text of the standard has been restructured. b) As regards the manufacturing proof test, the acceptance inspec
4、tion, marking, test certificate and use, reference is now made to DIN 685-3 to DIN 685-5. Previo us edit ions DIN 766: 1942-1 1, 1948-04, 1954-07; DIN 32891: 1980-06. 1 Scope and field of application This standard specifies dimensions and requirements for tested non-calibrated round steel link chain
5、s of grade 2, mainly used for manufacturing chain slings as specified in DIN 695. 2 Normative references This standard incorporates, by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the titles of the pub
6、lications are listed below. For dated references, subsequent amendments to or revisions of any of the publications apply to this standard only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies. DIN 685-1 Tested round s
7、teel chains - Concepts DIN 685-2 Tested round steel chains - Safety requirements DIN 685-3 Tested round steel chains -Testing Continued on pages 2 to 5. Translation by DI N-Sprachendienst. In case of doubt, the German-language original should be consulted as the authoritative text. No pari of this t
8、ranslation may be reproduced without the prior permission of Ref. No. DIN 32891 : 1996-0 DIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, D-10772 Berlin, has the exclusive right of sale for German Standards (DIN-Normen). _ English price group 05 . Sales No. 0105 12.97 Page 2 DIN 3
9、2891 DIN 685-4 DIN 685-5 DIN 695 DIN 17115 1996-04 Tested round steel chains - Marking and test certificate Tested round steel chains - Use Grade 2 chain slings with hook or ring type terminal fittings Steel for welded round steel chains - Technical delivery conditions 3 Concepts For concepts, see D
10、IN 685-1. 4 Dimensions and designation Figure 1 Designation of a grade 2 round steel link chain, with a nominal size, d, of 8 mm and a pitch, t, of 24 mm: Chain DIN 32891 - 2 - 8 x 24 Designation to be used when ordering Example of an order for 1 O0 m of round steel link chain of grade 2, with a nom
11、inal size, d, of 8 mm and a pitch, t, of 24 mm: 1 O0 m chain DIN 32891 - 2 - 8 x 24 5 Material Chains shall be made at least of grade RSt 35-2 steel as specified in DIN 171 15. The material composition and manufacture shall be as specified in DIN 685-2. 6 Finish 6.1 Surface finish The standard surfa
12、ce finish shall be natural black, other finishes being the subject of agreement. 6.2 Weld The weld diameter, d, shall not be less than d nor exceed d by more than 7,5 %. Welds shall be positioned in the centre of one leg of the links, the length affected by welding, a, not exceeding the value of d (
13、cf. annex B). 7 Requirements 7.1 Dimensions The chain dimensions and limit deviations of chains shall be in accordance with table 1. The chain length as supplied shall not differ from the length ordered by more than fl,75 YO. 7.2 Heat treatment The chains shall be heat treated and meet the requireme
14、nts specified in DIN 685-2 7.3 Mechanical properties The manufacturing proof force, breaking force and bend deflection of chains shall be as specified in table 2, the total ultimate elongation being at least 30 %.l) No cracks shall occur when subjecting chains to bend testing. l) Where natural black
15、 chain slings are to be supplied with a blank surface, the total ultimate elongation shall be at least 25 YO, and the specifications for the manufacturing proof force and breaking force specified in table 2 shall be complied with. Page 3 DIN 32891 : 1996-04 Table 1: Dimensions and mass Dimensions in
16、 mm Nominal link size d Limit deviations 6 f 0,2 Pitch Width Outside Approx. mass, Inside min. max. b, b2 in kg/m t Limit deviations 18 f 0,5 8 21,6 0,8 8 10 13 I f 0.5 I 39 I f1.2 I 17.5 I 46.8 I 3.8 I f 0,3 24 f 0,7 10,8 28,8 1,4 f 0,4 30 f 0,9 13,5 36 22 16 18 20 I fl I 60 I f1.8 I 27 1721 9 I f
17、0,6 48 f1,4 21,5 57,6 5,7 f 0,9 54 f1,6 24,3 64,8 7,3 23 I f 1,2 I 69 I f 2,l I 31 I 82,8 I 12 I 28 32 26 I f 1,3 I 78 I f2,3 I 35 I 93,6 I 15,2 I f 1,4 84 f 2,5 37,8 100,8 17,6 f 1,6 96 f 2,9 43,2 115 23 40 45 36 I f 1.8 I 108 I f 3.2 I 48.5 I 130 I 29 I f2 120 f 3,6 54 144 36 f 2,3 135 f 4,l 61 16
18、2 45,5 Nominal link size d 6 Table 2: Mechanical properties as a function of link size Dimensions in mm Lifting capacity, Minimum manufacturing Minimum breaking Minimum bend in kg proof force, in kN force, in kN deflection, f 32 O 63 12,5 5 10 13 I 8 I 630 I 12.5 I 25 I 7 1 O00 20 40 8 1600 32 63 11
19、 16 18 2 500 50 1 O0 13 3 200 63 125 15 I 20 I 4000 I 80 I 160 I 16 23 26 5 O00 1 O0 200 19 6 O00 125 250 21 I 28 I 8000 I 160 I 32 O I 23 40 45 I 32 I 10000 I 200 I 400 I 26 16 O00 320 63 O 32 20 O00 400 800 36 I 36 I 12 500 I 250 I 500 I 29 Page 4 8 Manufacturing proof test DIN 32891 : 1996-04 For
20、 manufacturing proof testing, the specifications of DIN 685-3 shall apply. 9 Acceptance inspection Acceptance inspection shall cover a dimensional check, tensile testing and bend testing, as specified in The heat treatment condition may be checked on the basis of a longitudinal section of the materi
21、al in the weld zone. Any other tests may be agreed upon when ordering. DIN 685-3. 10 Marking Marking of chains shall be as specified in DIN 685-4. In addition, chains shall have a round identification tag affixed to each unit delivered, as illustrated in figure 2. Test stamp of chain manufacturer to
22、 DIN 685-4 Nominal chain size (in mm) / Figure 2 11 Test certificate A test certificate shall be issued in accordance with DIN 685-4. 12 Use Handling, inspection and maintenance of chains shall comply with the specifications of DIN 685-5. Annex A Other relevant standards DIN 5687-1 Tested medium tol
23、erance round steel link chains, grade 5 DIN 5688-1 Grade 5 chain slings with hook or ring type terminal fittings DIN EN 818-2 Safety of short link chains for lifting purposes - Non-calibrated chain for chain slings, grade 8 DIN EN 818-3 Safety of short link chains for lifting purposes - Non-calibrat
24、ed chain for chain slings, grade 4*) DIN EN 81 8-4 Safety of short link chains for lifting purposes - Chain slings, grade 8 DIN EN 81 8-5 Safety of short link chains for lifting purposes - Chain slings, grade 4*) VBG-Richtlinie (VBG Code of practice) 9a Lastaufnahmeeinrichtngen im Hebezeugbetrieb (L
25、oad carrying devices for lifting purposes) *) At present at the stage of draft. Page 5 DIN 32891 : 1996-04 Minimum inside width, b, min1) 1,35 d I Maximum diameter of welded leg, d, my I 1,075 d I Maximum outside width, b, max I Diameter of unwelded leg, d I Id I 3,6 d I Approx. tolerance on width,
26、B, I 0,175 d I Stress at working load limit 63 N/mm2 Figure B.l: Chain link (notation) Stress at manufacturing test force I 125N/mm2 I Stress at breaking force I 250N/mm2 I Ratio of stresses at working load limit to those at manufacturing test force and breaking force 1 :2:4 Minimum bend deflection I f=0,8xd I
