化学成分：
|
牌号 Steel grade |
C ≤ |
Si ≤ |
Mn ≤ |
P ≤ |
S ≤ |
ALt ≥ |
Cr ≤ |
Ni ≤ |
Ti ≤ |
B ≤ |
碳当量 典型值 CEV Typical values |
| BW300 | 0.23 | 0.70 | 1.60 | 0.020 | 0.008 | 0.015 | 0.80 | 0.50 | 0.05 | 0.005 | 0.42 |
| BW400 | 0.30 | 0.70 | 1.60 | 0.020 | 0.010 | 0.015 | 1.00 | 0.70 | 0.05 | 0.005 | 0.46 |
| BW450 | 0.35 | 0.70 | 1.60 | 0.020 | 0.010 | 0.015 | 1.10 | 0.80 | 0.05 | 0.005 | 0.52 |
| BW500 | 0.38 | 0.70 | 1.60 | 0.020 | 0.010 | 0.015 | 1.20 | 0.80 | 0.05 | 0.005 | 0.55 |
