Q245R化学成分

一．Q245R化学成分
C ≤0.20
Si ≤0.35
Mn 0.50-1.10
Cu ≤0.30
Ni ≤0.30
Cr ≤0.30
Mo ≤0.08
Nb ≤0.050
V ≤0.050
Ti ≤0.030
Alt ≥0.020
P ≤0.025
S ≤0.010