forging grinding steel balls use B2,60Mn,65Mn,45# steel.

Material

C

Si

Mn

Cr

S

P

B2

0. 70%-0.85%

0.17%-0.37%

0.70%-0.80%

0.20%-0.70%

≤0.035%

≤0.035%

65Mn

0.62%-0.70%

0.17%-0.37%

0.90%-1.20%

<0.25%

≤0.035%

≤0.035%

60Mn

0.57%-0.65%

0.17%-0.37%

0.50%-0.80%

<0.25%

≤0.035%

≤0.035%

40Cr

0.37%-0.44%

0.17%-0.37%

0.50%-0.80%

0.80%-1.10%

≤0.035%

≤0.035%

45#

0.42%-0.50%

0.17%-0.37%

0.50%-0.80%

<0.25%

P:≤0.035%

P:≤0.035%

Nominal

diameter

(mm)

Diameteical

tolerance

(mm)

Weight of Single

of forging ball

in average

Number of piece of

One ton forging ball

in average

Surface

hardness

Impact

toughness

DIA 20

DIA 25

DIA 30

DIA 40

DIA 50

+2

-1

32

64

110

263

513

31250

15625

9090

3802

1949

55-65

 ≥12

DIA 60

DIA 70

DIA 80

DIA 90

DIA 100

+3

-2

888

1410

2104

2996

4110

1126

709

475

333

243

DIA 110

DIA 120

DIA 130

+4

-2

5457

7102

9030

182

140

110

DIA 140

DIA 150

+4

-3

11278

13871

88

72