C

Si

Mn

Cr

Mo

Cu

P

S

2.2 ~ 3.6

≤ 1.2

0.5 ~ 1.5

1.5 ~ 3.0

0 ~ 1.0

0 ~ 0.8

≤ 0.10

≤ 0.08

Hardness HRC

Impact ductility (no gap)J/cm2

d ( Mpa )

48 ~ 55

≥ 3.0

300 ~ 500

cement

coal

Metal mine

Wear and tear ( g )

70 ~ 100

60 ~ 80

500 ~ 1200

Breaking rate ( % )

≤ 1.0

≤ 1.0

≤ 2.0