化学成分：
|
成分
|
C
|
Si
|
Mn
|
P
|
S
|
Ni
|
Cr
|
Mo
|
Nb
|
Ti
|
B
|
|
Q690E
|
≤0.18
|
≤0.60
|
≤2.0
|
≤0.030
|
≤0.025
|
≤0.80
|
≤1.00
|
≤0.30
|
≤0.11
|
≤0.020
|
≤0.00
|
