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1, the technology conditions suitable for the thickness is no more than the 300 mm alloy steel structure.
2, size, shape, weight and deviation should be allowed to meet the provisions of the GB708-88.
3 and technical requirements
3.1 the chemical composition of steel (melting analysis) shall conform to the provisions of the table 1.
Chart 1
|
Steel grade |
C |
Si |
Mn |
P |
S |
Cu |
|
20MnSi |
0.16~0.22 |
0.60~0.80 |
1.00~1.30 |
≤0.030 |
≤0.020 |
≤0.20 |
3.2 delivery status: the hot rolling or are normalized delivery.
3.3 mechanical properties
According to delivery state, provide steel plate or is after the normalized mechanical properties: σs, σb, the delta 5, HB AKU and normal temperature.
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