hot-rolled alloy steel grinding media mill balls for ball mill

C

Si

Mn

Cr

S

P

0.50-0.65

0.15-0.37

0.69-1.2

≤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

Nominal 

Diameter

(mm)

Diameterical 

Tolerance

(mm)

Weight of Single 

Forging Ball in 

Average(g)

Number of piece 

of OneTon Forging 

Ball in Average

Surface 

Hardness

(HRC)

Impact 

Toughness

(j/cm2)

¢20

¢ 25

¢ 30

¢ 40

¢ 50

+2

-1

32

64

110

263

513

31250

15625

9090

3802

1949

50-65

≥12

¢ 60

¢ 70

¢ 80

¢ 90

¢ 100

+3

-2

888

1410

2104

2996

4110

1126

709

475

333

243

¢ 110

¢ 120

¢ 130

+4

-2

5457

7102

9030

182

140

110

   45-60

¢ 140

¢ 150

+4

-3

11278

13871

88

72

Materials

Impact

Test

(Ak.J/cm²)

Endurance

Test Times

(5m/T)

Surface 

Hardness

(Dia25mm-90mm)

Core 

Hardness

(Dia25mm-90mm)

Surface

 Hardness

(Dia90mm-150mm)

Core 

Hardness

(Dia90mm-150mm)

Breakage

50Mn

≥12

≥10000

≥52

≥42

≥50

≥40

<0.5%

60Mn

≥13

≥10000

≥52

≥42

≥50

≥40

<0.5%

65Mn

≥15

≥12000

≥54

≥44

≥52

≥42

<0.5%

B2

≥17

≥12000

≥60

≥52

≥58

≥50

<0.5%

75SiMn

≥16

≥12000

≥60

≥52

≥58

≥50

<0.5%

Impact -resistant Alloy

≥17

≥10000

≥50

≥40

≥48

≥38

<0.5%

Wear-resistant Alloy

≥17

≥12000

≥60

≥52

≥58

≥50

<0.5%

Material

C

Si

Mn

Cr

S

P

Times of Endurance impact test

50Mn

0.48-0.56

0.17-0.37

0.70-1.00

≤0.25

≤0.035

≤0.035

≥10000

60Mn

0.57-0.65

0.17-0.37

0.70-1.00

≤0.25

≤0.035

≤0.035

≥10000

65Mn

0.62-0.70

0.17-0.37

0.90-1.20

≤0.25

≤0.035

≤0.035

≥12000

B2

0.65-0.78

0.17-0.37

0.70-1.20

0.55-0.60

≤0.035

≤0.035

≥12000

75SiMn

0.70-0.90

0.40-0.80

0.70-1.20

≤0.25

≤0.035

≤0.035

≥12000

Impact -resistant Alloy

0.37-0.45

0.20-0.45

0.50-1.00

0.80-1.20

≤0.035

≤0.035

≥10000

Wear-resistant Alloy

0.75-0.90

0.15-0.42

0.65-1.10

0.88-1.20

≤0.035

≤0.035

≥12000