C

Mn

Si

Cr

Ni

P

S

Cu

Mo

Ti

Nb

Fe

≤0.05

≤0.50

≤0.50

11.0~12.5

7.5~9.5

≤0.04

≤0.03

1.5~2.5

≤0.5

0.8~1.4

0.1~0.5

余下