化学成分：
|
C
|
Si
|
Mn
|
P
|
S
|
Cr
|
Ni
|
Mo
|
Nb
|
V
|
Ti
|
B
|
|
≤
0.18
|
≤
0.50
|
≤
1.50
|
≤
0.020
|
≤
0.010
|
≤
0.90
|
≤
1.20
|
≤
0.60
|
≤
0.06
|
≤
0.08
|
≤
0.03
|
≤
0.003
|
