化学成分：
|
C
|
Si
|
Mn
|
P
|
S
|
Mo
|
Nb
|
B
|
Ni
|
Cr
|
Ti
|
V
|
|
≤
0.15 |
0.15
~ 0.50 |
0.80
~ 1.80 |
≤
0.020 |
≤
0.010 |
≤
0.60 |
≤
0.07 |
≤
0.003 |
≤
1.20 |
≤
0.80 |
≤
0.03 |
≤
0.08 |
