碳C
|
硅Si
|
锰Mn
|
硫S
|
磷P
|
铬Cr
|
镍Ni
|
铜Cu
|
0.37~0.44
|
0.17~0.37
|
0.60~0.90
|
≤0.050
|
≤0.040
|
≤0.25
|
≤0.25
|
≤0.25
|