60Si2MnA CHEMICAL COMPOSITION:  C :0.56~0.64

                                                                       Si:1.50~2.00

                                                                       Mn:0.60~0.90

                                                                       S :≤0.035

                                                                        P :≤0.035              

                                                                       Cr:≤0.35

                                                                       Ni:≤0.35

                                                                      Cu:≤0.25
STANDARD:   GB/T 5128

                         ASTM A401(M)

                         ASTM A231(M)

                         ASTM A877(M)