bsen818-3-1999升降用的短节链条安全吊链用中等公差链条4级

bsen818-3-1999升降用的短节链条安全吊链用中等公差链条4级内容摘要：

ains those hazards which require action to reduce risk identified by risk assessment as being specific and significant for short link chain (medium tolerance) grade 4. Table 1 — Hazards and associated requirements Hazards identified in EN 1050:1996, annex A Relevant clause of EN 2922:1991/A1:1995, annex A Relevant clause/subclause of this part of EN 818 1e) Mechanical hazard due to inadequacy of strength 5 5 5 6 7 8 9 5 Safety requirements General The chain shall also conform to the appropriate requirements of EN 8181:1996. Dimensions Nominal size of chain, dn The nominal size of the chain shall be one of the sizes listed in Table 2, column 1. Tolerance on material diameter (except at the weld) The tolerance on the material diameter for each nominal size of chain shall be in accordance with Table 2, column 2. Page 6 EN 8183:1999 169。 BSI 091999 Weld diameter The maximum diameter at the weld for each nominal size of chain shall be in accordance with Table 2, column 3. The thickness of the steel at the weld shall nowhere be less than the actual diameter of the steel adjacent to the weld. Length dimensionally affected by welding The length dimensionally affected by welding e (see EN 8181:1996, Figure 1) shall not extend by more than 0,6dn to either side of the centre of the link. Pitch and widths The dimensions of the pitch and widths of the individual links and chain shall be as specified in Table 2, columns 4 to 8, and illustrated in EN 8181:1996, Figure 1. Table 2 — Dimensions Dimensions mm (1) (2) (3) (4) (5) (6) (7) (8) Nominal size dn Material diameter tolerance Weld diameter ds max. Pitch Internal width away from the weld w1 min. External width over the weld w2 max. pn pmax pmin 7 177。 0,28 7,7 21 21,6 20,4 9,1 25,9 8 177。 0,32 8,8 24 24,7 23,3 10,4 29,6 10 177。 0,4 11 30 30,9 29,1 13 37 13 177。 0,52 14,3 39 40,2 37,8 16,9 48,1 16 177。 0,64 17,6 48 49,4 46,6 20,8 59,2 18 177。 0,9 19,8 54 55,6 52,4 23,4 66,6 19 177。 1 20,9 57 58,7 55,3 24,7 70,3 20 177。 1 22 60 61,8 58,2 26 74 22 177。 1,1 24,2 66 68 64 28,6 81,4 23 177。 1,2 25,3 69 71,1 66,9 29,9 85,1 25 177。 1,3 27,5 75 77,3 72,8 32,5 92,5 26 177。 1,3 28,6 78 80,3 75,7 33,8 96,2 28 177。 1,4 30,8 84 86,5 81,5 36,4 104 32 177。 1,6 35,2 96 98,9 93,1 41,6 118 36 177。 1,8 39,6 108 111 105 46,8 133 40 177。 2 44 120 124 116 52 148 45 177。 2,3 49,5 135 139 131 58,5 167 Page 7 EN 8183:1999 169。 BSI 091999 Materials and heat treatment Quality of material General Within the limitations given in to the chain manufacturer shall select the type of steel to be used so that the finished chain, when suitably heattreated, meets the mechanical properties specified in this part of EN 818. Type of steel The steel used shall be produced by an electric process or by an oxygen blown process. Deoxidation The steel shall be fully killed as defined in EN 10025:1990/A1:1993, be stabilized against strain age embrittlement and have an austenitic grain size of 5 or finer when tested in accordance with ISO 643. Chemical position To ensure that chain is stabilized against strain age embrittlement during service the steel shall contain at least 0,025 % aluminium. The steel shall contain no more sulfur and phosphorus content than the limits given in Table 3. Table 3 — Sulfur and phosphorus content Element Maximum mass content % as determined by Cast analysis Check analysis Sulfur 0,025 0,030 Phosphorus 0,025 0,030 The silicon content shall be as specified in Table 4. NOTE The purpose of this requirement is to limit the detrimental effect when the chain is used in a galvanizing bath. Table 4 — Silicon content Element Mass content % as determined by Cast analysis Check analysis Silicon 0,12 to 0,30 0,15 to 0,35 Heat treatment All the chain shall be heattreated in accordance with a) or b) before being subjected to the manufacturing proof force. a) Chain shall be hardened from a temperature above the AC3 point and tempered. The tempering temperature shall be at least 475 176。 C. The tempering conditions shall be at least as effective as a temperature of 475 176。 C maintained for a period of 1 h. NOTE A method of verification is to test sample chains after they have been reheated to and maintained for 1 h at 475 176。 C and then cooled to room temperature。 following which they should conform in the finished condition to the requirements of and . b) Alternatively the chain shall be normalized from a temperature above the AC3 point. 169。 BSI 091999 Page 8 EN 8183:1999 Mechanical properties Manufacturing proof force (MPF) All the chain shall be subjected to the manufacturing proof force specified in Table 5, column 3 for the appropriate nominal size of chain. Breaking force (BF) and total ultimate elongation (A) Samples of chain in the finished condition shall have a breaking force at least equal to that specified in Table 5, column 4 for the appropriate nominal size of chain. On pletion of the static tensile test the total ultimate elongation as defined in EN 8181:1996 shall be not less than 25 %. Bend deflection Single link samples shall withstand the minimum deflection specif。