WYJ018-2004                         WSM30A

1, the technology conditions apply to manufacture the plastic mould parts with thickness is not more than 305 ㎜WSM30A low alloy die the cherry blossom steel plate.

2, size, shape, weight and allow deviation

2.1 the edge rolling steel together. Cut the head and tail, don't cut two longitudinal and edge.

2.2 steel plate roughness requirements:

2.2.1 steel vertical roughness ≤5 ㎜/ M;

2.2.2 steel horizontal roughness≤3 ㎜/ M, and roughness than 6≤/ 2 M;

2.2.3 steel plate local roughness≤3 ㎜/ 400 ㎜;

2.2.4 card need to record the measured steel roughness.

2.3 plate thickness tolerance:-0 ~ + 3 ㎜.

2.4 the length of steel plate tolerance: + 20 ~ + 50 ㎜.

Flash 2.5 steel plate cushion control (see table 1)

Table 1            unit：㎜

table1            unit：㎜

Note: the flash allowance is the sum total of the bilateral allowance

2.6 project mark coincidence

Plates shall be ordered to theoretical weight delivery, steel plate width to steel plate, the head, in three places in the average of the ore degrees minus the minimum allowance of steel for flash for weight width; Steel plate with the actual length minimum length reduction for weight tolerance for length. Length. Thick < 100 ㎜steel plate, thickness of 0.5 ㎜added value; Frequency ㎜steel plate thickness of 100, the added value of the thickness of 1.0 ㎜. According to the regulations of the steel plate GB247 marking.

2.7 steel plate to the rest of the size, shape, weight and deviation should be allowed to meet the provisions of GB709-88.

3 and technical requirements

3.1 the chemical composition of the steel plate (melting analysis) shall conform to the provisions of table 2.

Table 2             Wt%

3.2 meltingmethods: the smelting furnace electric vacuum and refined the + processing.

3.3 delivery status: the hot rolling or hot rolling + low temperature firing back

3.4 delivery hardness: 275 ~ 340 HB, including > 80 mm steel the hardness of the steel plate surface head, heavy, tail hardness average. And poor control with board hardness HB than in 35.

3.5 internal quality

Steel plate internal shall not visible to the shrinkage, cracks, slag inclusion, stratification, bubble, such as the white metallurgy defects, ZhangJinHang by ultrasonic testing of inspection, testing standard and qualified level should be indicated in the contract.

3.6 surface quality

The steel plate surface may not have visible crack, scarred, bubble, fold, slag, shall not be pressed into the oxidation iron, steel plate can not have stratification. The above defects should be cleared up, clean up the place should be smooth, blunt, and ensure the minimum thickness of the steel plate.

4, and method of inspection of the

4.1 no more than 70 mm thickness steel, steel plate doingsampling inspectionone by one , the steel plate and head plate width 1/4 sampling, brinell hardness experiment method should comply with the regulations of the GB231-84.

4.2 > 70 mm thickness (or hot slag, slow cold pit processing steel plate) steel plate, the on-site inspection one by one , inspection parts in the steel plate surface head, tail, five hardness, with five for average results. Other implementation of the provisions of the WYJ003-2001.

5, packaging, signs and instructions

5.1 steel plate package, mark and quality specification should comply with the regulations of the GB247-1997.

5.2 if have special request, both parties through consultation and decide.