碳C
|
硅Si
|
锰Mn
|
硫S
|
磷P
|
铬Cr
|
镍Ni
|
0.17-0.25
|
0.17-0.37
|
0.30-0.60
|
≤0.030
|
≤0.030
|
0.60-0.90
|
2.75-3.25
|