碳C
|
硅Si
|
锰Mn
|
硫S
|
磷P
|
铬Cr
|
镍Ni
|
铜Cu
|
0.17~0.23
|
0.15~0.40
|
0.30~0.60
|
≤0.030
|
≤0.030
|
1.25~1.75
|
3.25~3.75
|
≤0.25
|