MAME

BRAND

HARDNESS

IMPACT VALUE

ak(J/cm2)

METALLOGRAPHIC

ORGANIZATION

BALLS

FATIGUE LIFE

QUENCHING STATE(A)

NO- QUENCHING STATE(A)

IMPACT

High Chromium

Casting Ball

ZQCr26

≥60

≥45

≥4.0

M+C

≥8000

ZQCr20

≥60

≥45

≥3.5

≥8000

ZQCr17

≥60

≥49

≥3.0

≥8000

ZQCr13

≥60

≥50

≥2.3

≥8000

 Forging alloyed ball

Chemical Compostion

Model

C 

Si

Mn

Cr

Cu

Mo

P

S

Ordinary one

2.0-3.0

0.4-1.0

0.3-1.5

≤0.3

0-0.8

0-0.8

≤0.15

≤0.15

Low Chromium alloyed

2.6-3.5

0.6-1.5

0.5-1.5

1.0-3.0

0-0.8

0-0.8

≤1.15

≤1.15

Medium Chromium alloyed

2.3-3.0

0.8-1.5

0.5-2.2

3.0-8.0

0.4-1.3

0.2-1.0

≤0.12

≤0.12

High Chromium alloyed

2.0-3.2

0.4-1.6

0.4-3.5

10.0-16.0

0.2-1.8

0.3-1.5

≤0.10

≤0.10

Cast  iron  ball

Chemical Compostion

Model

C 

Si

Mn

Cr

Cu

Mo

P

S

Low Chromium

2.0-3.6

≤1.0

0.5-1.5

1.5-3.0

0-0.2

0-1.0

≤0.1

≤0.06

Medium Chromium

2.1-3.2

0.5-1.5

0.5-1.5

7.0-10.0

0-0.1

0-3.0

≤0.1

≤0.06

High Chromium

2.5-3.2

≤1.0

0.5-1.5

12.0-17.0

0-0.8

0-1.0

≤0.1

≤0.06

High Chromium

2.0-2.8

≤1.0

0.5-1.5

22.0-28.0

0-0.8

0-1.0

≤0.1

≤0.06

Forged steel ball             

Chemical Compostion

Modle

C

Si

Mn

Cr

S

P

HRC

A(Dia20-150mm)

0.5-0.65

0.2-0.37

0.6-1.2

≤0.25

≤0.04

≤0.04

50-55

B(Dia20-150mm)

0.5-0.8

0.2-0.37

0.6-0.8

0.9-1.1

≤0.04

≤0.04

55-60

C(Dia20-150mm)

0.7-0.9

0.2-0.37

0.7-1.0

0.5-0.9

≤0.04

≤0.04

60-65