钢的等级 |
A |
B |
D |
E |
|
化学成分 |
C |
≤0.21 |
≤0.21 |
≤0.21 |
≤0.18 |
Si |
≤0.50 |
≤0.35 |
≤0.35 |
≤0.35 |
|
Mn |
≥2.5C |
0.80-1.20 |
0.60-1.20 |
0.70-1.20 |
|
P |
≤0.035 |
≤0.035 |
≤0.035 |
≤0.035 |
|
S |
≤0.035 |
≤0.035 |
≤0.035 |
≤0.035 |
|
Als |
- |
- |
≥0.015 |
≥0.015 |
|
CuCr |
≤0.35 |
≤0.35 |
≤0.35 |
≤0.35 |
|
Ni |
≤0.30 |
≤0.30 |
≤0.30 |
≤0.30 |
|
Mo |
≤0.30 |
≤0.30 |
≤0.30 |
≤0.30 |