mark

                 The detailed chemical component (%)

C

Si

Mn

P

S

20MnK

0.15~0.26

0.20~0.60

1.20~1.60

<=0.045

<=0.045

25MnK

0.21~0.31

0.20~0.60

1.20~1.60

<=0.045

<=0.045

20MnVK

0.17~0.24

0.17~0.24

1.20~1.60

<=0.045

<=0.045