High Chrome Grinding Casting Ball
1.Material and Chemical Composition of Casting Steel Ball
Based on material,the casting steel balls are defined into 6 brands. And The chemical composition is shown in the following:
Name
Material
C
Si
Cr
Mn
S
P
Special-8
Cr-22-32%
2.0-2.8
≤1.0
22-32
0.5-2.0
≤0.06
≤0.08
Special-9
Cr-17-22%
2.0-2.8
≤1.0
17-22
0.5-2.0
≤0.06
≤0.08
Special-10
Cr-15-17%
2.2-3.0
≤1.0
15-17
0.5-2.0
≤0.06
≤0.08
Special-11
Cr-11-14%
2.2-3.2
≤1.0
11-14
0.5-2.5
≤0.06
≤0.08
Special-12
Cr-5-10%
2.1-3.2
≤1.2
5-10
0.5-1.5
≤0.06
≤0.08
Special-13
Cr-1.5-3%
2.2-3.5
≤1.2
1.5-3
0.5-1.5
≤0.06
≤0.08
2.Physical Property of Casting Steel Ball
According to the theory and tests, the hardness of casting steel ball is shown in the following:
Name
Material
Impact Test AK.J/cm
Endurance Test times (5m)
Hardness(HRC)
Dia.25-60mm
Dia.70-100mm
Quenching
Unquenching
Quenching
Unquenching
Special-8
Cr-22-32%
≥4
≥10000
≥60
≥49
≥60
≥48
Special-9
Cr-17-22%
≥4
≥10000
≥60
≥49
≥60
≥48
Special-10
Cr-15-17%
≥4
≥10000
≥60
≥49
≥58
≥48
Special-11
Cr-11-14%
≥3
≥10000
≥58
≥49
≥56
≥48
Special-12
Cr-5-10%
≥3
≥8000
-
≥48
-
≥48
Special-13
Cr-1.5-3%
≥2
≥8000
-
≥48
-
≥45
3.High chrome cast balls
Size: 20mm-120mm
Hardness:HRC58-65; Chrome content:11-14%
4.Low chrome cast balls
Size: 20mm-120mm
Hardness:HRC45-55; Chrome content:1-3.5%
5.Applied Field
1).Cement Plants
2).Mines
3).Power stations
4).Chemical Industries
5).Grinding Mill, Ball mill, Coal mill
6. Products Name
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7.Technological Characters of Cast Steel Ball
(1)Chemical Composition Matching
The best configuration of various alloying elements can combine the ball's hardness and toughness at their best.
(2)Melting and Pouring Process
All cast steel balls are produced by intermediate frequency electric furnace. The purity and stability of materials are effectively ensured after uniform temperature conditioning and twice hot metal purification.
(3)Temperature Control Process
Our techinical workers duly master the proper pouring temperature, mold temperature, so that the products achieve a good state of body tissue during the transition from liquid to solid states.
(4)Moulding Process
Pouring when the molten iron temperature reaches 1500°c. In this way, the ball can achieve internal organization of grain refinement and be more dense. Meanwhile, the carbide is radially arranged, and such carbide is embedded in the matrix again during grinding process, so forming hard layer. Thus, it greatly improves the toughness and hardness of the grinding balls.
(5)Heat Treatment Process
We have two sets of heat treatment production line. One is oil quenching, and another is air quenching. The steel grinding balls has the characters of high hardness, good toughness, low wear rate, low break rate etc. through tempering.