grinding media ball (cast grinding media)

We supply grinding balls for the mining, cement, steel plant, power plant, aggregates etc industries. According to the working conditions, we could supply casting, forged, high Cr, low Cr, high C, low C grinding balls. For the casting balls, we are using our unique metallic molding casting process, which will have higher microstructure density comparing to normal sand molding line. Adding unique heat treatment technology, our balls will offer lower wear rate. Liner and grate plays an important role in the mill. We design the shape and alloy to reach the optimal function. In 1st cpt , we design its lifting power to have the best crushing efficiency. In 2nd cpt, we design its classifying power to have the best grinding efficiency. We believe that with our ball charge gradation design will improve the mill production and reach higher efficiency.

Superior grinding performance

High-Chrome media combining a martensitic structure with hard chrome carbides provides the optimum wear resistance against abrasion and corrosion. Our strong expertise is enabling us to select the right alloy to fit your application and minimize the costs.
  • Steady milling conditions due to low wear rate
  • Constant hardness of all grinding media for each alloy
  • Positive influence of down-stream process
  • Cr nominal %: ≈10 -> 35
Starting with a cross-section insight of our customers’ value chain, combining expert advice, services and resources, products, equipment and systems, Chengda uses all relevant tools to help customers optimize their operations, recover more valuable minerals, and deliver their final products or services at the best total cost of ownership with minimal environmental impact. Testing Method and Inspection Rules  
  1. Impact Test
  2. Rockwell Hardness Test Specimen Preparation
  3. Chemical Composition Inspection
  4. Surface Hardness Inspection
  5. Internal Quality Inspection
  1. Chemical Composition of chromium cast grinding balls  
Item No.s Classification Cr % C/% Si/% Mn/% Cr/% S/% P/%
ZQCR26 High Chrome Cr-24-28% 1.8-2.8 ≤1.2 0.4-2.0 23-32 ≤0.01 ≤0.01
ZQCR20 Cr-19-21% 1.8-2.8 ≤1.2 0.4-2.0 18-22 ≤0.01 ≤0.01
ZQCR17 Cr-16-18% 1.8-3.0 ≤1.2 0.4-2.0 15-17 ≤0.01 ≤0.01
ZQCR12 Cr-11-13% 2.0-3.2 ≤1.2 0.4-2.0 10-14 ≤0.01 ≤0.01
ZQCR06 Medium Chrome Cr-5-9% 2.1-3.2 ≤1.2 0.4-1.5 5-9 ≤0.01 ≤0.01
ZQCR04 Low Chrome Cr-1-4% 2.2-3.5 ≤1.2 0.4-1.5 1-4 ≤0.02 ≤0.02
  2. Physical Property of chromium cast grinding balls
Model Hardness(HRC) Impact Test(Ak.J/cm2) Endurance Test Times(5m) Microstructure
Quenching Unquenching
High Chrome ≥60 ≥58 ≥3 ≥12000 M+C
Medium Chrome - ≥53 ≥2 ≥10000 P+C
Low Chrome - ≥50 ≥2 ≥10000 P+C
  3. Specification of chromium cast grinding balls
Nominal Diameter Diameter Tolerance Weight of Single Ball In Average Numbers of Per Ton Ball In Average
(mm) (Inch) (mm) (g)
20 0.75'' +2 -1 32 31250
25 1'' 64 15625
30 1.25'' 110 9090
40 1.5'' 263 3802
50 2'' 513 1949
60 2.5'' +3 -2 888 1126
70 2.75 1410 709
80 3.25'' 2104 475
90 3.5'' 2996 333
100 4'' 4110 243
110 4.5'' +4 -2 5457 182
120 4.75'' 7102 140
130 5'' 9030 110
140 5.5'' +4 -3 11278 88
150 6'' 13871 72
 

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