C

Si

Mn

Cr

Ni

Mo

σ b Mpa

σ 0.2Mpa

?? %

≤ 0.12

≤ 0.50

≤ 0.60

11.5~13.5

≤ 0.60

≤ 0.75

≥ 480

≥ 25

C

Si

Mn

Cr

Ni

Mo

N

σ b Mpa

σ 0.2
Mpa

δ %

≤ 0.03

≤ 0.65

1.0~2.5

22.0~24.0

8.0~10.0

2.5~3.5

≤ 2.0

≥ 550

≥ 450

≥ 20

C

Si

Mn

Cr

Ni

Mo

Cu

σ b Mpa

σ 0.2
Mpa

δ %

≤ 0.03

≤ 0.65

1.0~2.5

20.0~23.0

25.0~28.0

4.5~6.0

≤ 2.0

≥ 510

≥ 320

≥ 25