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1. The technology conditions apply to 8 ~ 20 mm thickness of 20 CrMo steel plates.
2. The size, shape, weight and allow deviation
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) should comply with the provisions of the GB3077-88, see the table below.
|
C |
Si |
Mn |
P |
S |
Cr |
Mo |
Cu |
|
0.17~0.24 |
0.17~0.37 |
0.40~0.70 |
≤0.025 |
≤0.025 |
0.80~1.10 |
0.15~0.25 |
≤0.30 |
3.2 delivery status: normalized and backfiring
3.3 machinery and process performance
Steel plate machinery and process performance should be consistent with the provisions of the table
|
σs，MPa |
σb，MPa |
δ5，％ |
ψ，％ |
常温AKU，J/cm2 |
|
≥245 |
≥461 |
≥18 |
≥30 |
≥29.4 |
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