Specification of forged steel Grinding balls

Nominal diameter

Diameteical

Tolerance

Weight of single ball in average

Surface hardness

Impact toughness

(mm)

(mm)

(g)

(HRC)

(j/cm2 )

Φ20

+2 -1

32

55-65

≥12

Φ25

64

Φ30

110

Φ40

263

Φ50

513

Φ60

+3 -2

888

Φ70

1410

Φ80

2104

Φ90

2996

Φ100

4110

Φ110

+4 -2

5457

50-60

Φ120

7102

Φ130

9030

Φ140

+4 -3

11278

Φ150

13871

Chemical elements of forged steel balls

C

Si

Mn

Cr

S

P

0.50-0.65

0.15-0.37

0.6-1.2

≤0.25

≤0.04

≤0.04

0.7-0.9

0.45-0.75

0.7-1.25

0.11-0.4

≤0.04

≤0.04