WYJ001-2004

1. The technology conditions apply to manufacture the plastic mould parts with thickness is not more than 305 mm in the P20M, P20H sclerosis, 718, 2311, 2738, P80A, DIMO42H alloy die steel plates.

2. The size, shape, weight and allow deviation

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

2.2 steel plate roughness requirements:

2.2.1 steel vertical roughness ≤5 mm/M

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

2.2.3 steel plate local roughness ≤3 mm / 400 mm

2.2.4 card need to record the measured steel roughness.

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

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

 2.5 steel plate Flash allowancecontrol (see table 1)

Table 1             unit：mm

2.6 for weight and mark

Plates according to theoretical weight to delivery, steel plate width to steel plate, the head, in three places of the width of the average minus the minimum allowance of steel for flash for weight width; Steel plate with the actual length length minus the minimum length for weight tolerance for length. "100 mm thickness steel plate, the added value of the thickness of 0.5 mm; 100 mm steel plate thickness frequency, the added value of the thickness of 1.0 mm. According to the regulations of the steel plate GB247 marking.

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

3. Technical requirements

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

3.2 delivery status: normalized and backfiring

3.4 delivery hardness: should satisfy the relevant provisions of the table 3, among them: > 70 mm thickness of steel (or slow cold pit processing steel plate), the hardness of the steel plate surface head, tail hardness, average.

Table 3  Hardness of the steel plate

Table 2 chemical composition

（heat analysis

）