Grade

Chemical composition   (%)

HB  ≤

C

Si

Mn

Cr

V

B

P ≤

S≤

65Mn

0.62-0.70

0.17-0.37

0.90-1.20

≤0.25

0.035

0.035

302

55Si2Mn

0.52-0.60

1.50-2.00

0.60-0.90

≤0.35

0.035

0.035

302

60Si2Mn

0.56-0.64

1.50-2.00

0.60-0.90

≤0.35

0.035

0.035

321

60Si2MnA

0.56-0.64

1.60-2.00

0.60-0.90

≤0.35

0.030

0.030

321

55CrMnA

0.52-0.60

0.17-0.37

0.65-0.95

0.65-0.95

0.030

0.030

321

60CrMnA

0.56-0.64

0.17-0.37

0.70-1.00

0.70-1.00

0.030

0.030

321

50CrVA

0.46-0.54

0.17-0.37

0.50-0.80

0.80-1.10

0.10-0.20

0.030

0.030

321

60CrMnBA

0.56-0.64

0.17-0.37

0.70-1.00

0.70-1.00

0.0005-0.004

0.030

0.030

321

55SiMnVB

0.52-0.60

0.70-1.00

0.70-1.00

≤0.35

0.08-0.16

0.0005-0.0035

0.030

0.030

321

60SiCrBA

0.56-0.64

1.40-1.80

0.40-0.70

0.90-1.20

0.10-0.20

0.030

0.030

321

60Si2CrA

0.56-0.64

1.40-1.80

0.40-0.70

0.70-1.00

0.025

0.025

321

60Si2CrVA

0.56-0.64

1.40-1.80

0.40-0.70

0.90-1.20

0.10-0.20

0.025

0.025

321

55SCrA

0.51-0.59

1.20-1.60

0.50-0.80

0.50-0.80

0.025

0.025

321

50CrMnA

0.46-0.54

0.17-0.37

0.50-0.80

0.80-1.10

0.10-0.20

0.025

0.025

321