Mine Special High Chromium Alloy Cast Iron Grinding Ball
production Description
The hardness of the steel ball determines the level of wear resistance, the hardness difference between the surface and the core of the steel ball determines the rate of roundness and breakage of the steel ball, the smaller the difference between the internal and external hardness, the lower the rate of roundness and breakage. The hardness difference between the surface and the core required by the national standard is ≤3HRC.
Chengda's patented products strive for excellence, surface hardness 59HRC and core hardness 58.5HRC, internal and external hardness check control within 0.2HRC, impact toughness value of 10J/cm². Our mine special high chromium grinding ball has excellent mechanical properties and has been praised by the majority of mining metallurgy customers.
Patented product: 140mm diameter mine special ultra-high chromium high wear-resistant steel ball
Features
High wear resistance: Mine special high chromium grinding ball contains a high proportion of chromium element, chromium content is usually between 10% and 21%, which makes the grinding ball surface hardness, excellent wear resistance, suitable for use in severe wear mining environment.
High hardness: After heat treatment processes (such as quenching and tempering), high chromium grinding balls can obtain a high Rockwell hardness (HRC), usually above HRC58, which helps to improve the impact resistance and wear resistance of the grinding ball.
Good impact toughness: While maintaining high hardness, high chromium mill balls also have good toughness, which makes them less likely to break when subjected to shocks and collisions in the mine mill.
Long service life: Due to high wear resistance and high hardness, the service life of high-chromium grinding balls for mining is longer than that of ordinary grinding balls, reducing the frequency of replacement and reducing long-term operating costs.
High chromium content: The increase of chromium content helps to form more chromium carbide hard phase, which increases the ability of the mill ball to resist wear.
Economic benefits: Although the initial cost of high-chromium grinding balls for mine use may be higher than that of low-chromium or medium-chromium grinding balls, they can bring better economic benefits to mining enterprises in the long run due to their longer service life and lower wear rate.
Environmental adaptability: The high chromium mill is suitable for a variety of mine environments, including wet and dry grinding, as well as handling ores of different hardness and properties.
Production technology: Some special high-chromium grinding balls for mines use special production processes, such as secondary metamorphism treatment, to further improve the performance of the grinding ball.
Widely used: In addition to the mining industry, high chromium grinding ball is also widely used in cement, thermal power generation, flue gas desulfurization, chemical industry, coal water slurry, pellets, slag, ultrafine powder, fly ash, calcium carbonate, quartz sand and other industries.
These characteristics of high chromium grinding ball for mine use make it an ideal choice to improve grinding efficiency and reduce production costs. With the development of industry and the improvement of energy saving and environmental protection requirements, the application of high chromium grinding ball in the mining industry will be more and more extensive.
CHEMICAL COMPOSITIONS(%)
|
Designation |
Chemical Composition(%) |
||||||||
|
C |
Si |
Mn |
Cr |
Mo |
Cu |
Ni |
P |
S |
|
|
ZQCr26 |
2.0-2.6 |
≤1.0 |
0.3-1.5 |
23.0-27.0 |
≤1.0 |
≤1.0 |
≤1.0 |
≤0.06 |
≤0.06 |
|
ZQCr20 |
2.0-2.6 |
≤1.0 |
0.3-1.5 |
18.0-23.0 |
≤1.0 |
≤1.0 |
≤1.0 |
≤0.06 |
≤0.06 |
|
ZQCr15 |
2.0-2.6 |
≤1.0 |
0.3-1.5 |
14.0-18.0 |
≤1.0 |
≤1.0 |
≤1.0 |
≤0.06 |
≤0.06 |
|
ZQCr12 |
2.2-3.0 |
≤1.0 |
0.3-1.5 |
10.0-14.0 |
≤1.0 |
≤1.0 |
≤1.0 |
≤0.06 |
≤0.06 |
|
ZQCr8 |
2.2-3.0 |
≤1.0 |
0.3-1.5 |
7.0-10.0 |
≤1.0 |
≤0.8 |
≤1.0 |
≤0.06 |
≤0.06 |
|
ZQCr5 |
2.2-3.2 |
≤1.0 |
0.3-1.5 |
4.0-6.0 |
≤1.0 |
≤0.8 |
≤1.0 |
≤0.08 |
≤0.08 |
|
ZQCr2 |
2.2-3.2 |
≤1.0 |
0.3-1.5 |
1.0-3.0 |
≤1.0 |
≤0.8 |
≤1.0 |
≤0.10 |
≤0.10 |
|
ZQCADI |
3.3-3.9 |
2.4-3.0 |
1.4-1.9 |
0.2-0.5 |
≤0.5 |
0.1-0.5 |
0.1-0.5 |
≤0.05 |
≤0.05 |
MECHANICAL PROPERTIES AND MICROSTRUCTURE
|
Designation |
HRC |
AK(J/CM²) |
Microstucture |
Falling Times |
|
ZQCr28 |
≥58 |
≥4.8 |
M+C |
≥18000 |
|
ZQCr26 |
≥58 |
≥4.8 |
M+C |
≥18000 |
|
ZQCr20 |
≥59 |
≥4.8 |
M+C |
≥18000 |
|
ZQCr15 |
≥60 |
≥4.8 |
M+C |
≥18000 |
|
ZQCr12 |
≥60 |
≥4.5 |
M+C |
≥18000 |
|
ZQCr8 |
50-65 |
≥3.5 |
P+C/M+C |
≥12000 |
|
ZQCr5 |
49-62 |
≥3.0 |
P+C/M+C |
≥12000 |
|
ZQCr2 |
≥48 |
≥3.0 |
P+C |
≥10000 |
|
ZQCADI |
55-60 |
≥10 |
B+Fe |
≥25000 |
|
C-Carbide M-Martensite P-Pearlite B-Bainite Fe-Ferrite |
||||
SPECIFICATION
|
Specification (mm） |
Weight of Each Ball (Kg) |
Pcs/ton |
T/m |
|
φ15 |
0.017 |
58824 |
4.94 |
|
φ17 |
0.024 |
41667 |
4.91 |
|
φ20 |
0.037 |
27027 |
4.89 |
|
φ25 |
0.070 |
14286 |
4.87 |
|
φ30 |
0.110 |
9091 |
4.85 |
|
φ40 |
0.257 |
3891 |
4.76 |
|
φ50 |
0.500 |
2000 |
4.70 |
|
φ60 |
0.867 |
1153 |
4.66 |
|
φ70 |
1.070 |
729 |
4.62 |
|
φ80 |
2.050 |
487 |
4.60 |
|
φ90 |
2.900 |
345 |
4.58 |
|
φ100 |
4.000 |
250 |
4.56 |
|
φ110 |
5.300 |
188 |
4.55 |
|
φ120 |
6.800 |
147 |
4.54 |
|
φ125 |
7.750 |
129 |
4.52 |
|
φ130 |
8.740 |
114 |
4.50 |
