C碳(%)
Si硅(%)
Mn锰(%)
P磷(%)
S硫(%)
St35
≤0.17
≤0.35
≥0.40
≤0.0250
内控标准
同上
≤0.020
St45
≤0.21
St52
≤0.20
≤0.55
≥1.60
0.33-0.41
0.17-0.37
0.50-0.80
0.035
0.42-0.50