牌号

化 学 成 份 ％

C

Si

Mn

P

S

Cr

Ni

Cu

20Mn2

0.17-0.24

0.17-0.37

1.40-1.80

≤0.035

≤0.035

≤0.30

≤0.30

≤0.30

30Mn2

0.27-0.34

0.17-0.37

1.40-1.80

≤0.035

≤0.035

≤0.30

≤0.30

≤0.30

35Mn2

0.32-0.39

0.17-0.37

1.40-1.80

≤0.035

≤0.035

≤0.30

≤0.30

≤0.30

40Mn2

0.37-0.44

0.17-0.37

1.40-1.80

≤0.035

≤0.035

≤0.30

≤0.30

≤0.30

45Mn2

0.42-0.49

0.17-0.37

1.40-1.80

≤0.035

≤0.035

≤0.30

≤0.30

≤0.30