Classification Chemical Composition And Metallurgical Structure:
| Name | Material | C | Si | Cr | Mn | S | P | Mo | Al | microstructure |
| DZ-7 | special-CrⅠ | 2.0-2.8 | ≤1.0 | 22-32 | 0.5-2.0 | ≤0.06 | ≤0.08 | micro | micro | M +C |
| DZ-8 | special-CrⅡ | 2.0-2.8 | ≤1.0 | 17-22 | 0.5-2.0 | ≤0.06 | ≤0.08 | micro | micro | M +C |
Mechanical Property:
|
Name
|
Material
|
Impact test (AK. J/cm2)
|
Endurance test times(5m)
|
Quenching Hardness (HRC)
|
Un quenching Hardness( H RC)
|
Breakage
|
|
DZ-7
|
special-CrⅠ
|
≥4
|
≥10000
|
≥60
|
≥49
|
<1%
|
|
DZ-8
|
special-CrⅡ
|
≥4
|
≥10000
|
≥60
|
≥48
|
<1%
|
Substance:
|
Nominal Diameter (mm)
|
Diameter Tolerance (mm)
|
Approx Weight Per Ball (kg)
|
Average Number Per MT
|
|
Ф 25
|
+1,-0.5
|
0.033
|
30303
|
|
Ф30
|
+1,-0.5
|
0.064
|
15625
|
|
Ф40
|
+2.0,-1.0
|
0.11
|
9090
|
|
Ф 50
|
+2.0,-1.0
|
0.261
|
3831
|
|
Ф60
|
+2.0,-1.0
|
0.510
|
1961
|
|
Ф70
|
+2.0,-1.0
|
0.883
|
1132
|
|
Ф80
|
+3.0,-1.5
|
1.402
|
713
|
|
Ф90
|
+3.0,-1.5
|
2.092
|
478
|
|
Ф100
|
+3.0,-1.5
|
2.98
|
335
|
|
Ф110
|
+3.0,-1.5
|
4.087
|
244
|
|
Ф120
|
+3.0,-1.5
|
5.44
|
183
|
|
Ф130
|
+3.0,-1.5
|
7.062
|
141
|