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Small size: Ø10mm--Ø40mm;
Medium size: Ø50mm--Ø90mm;
Big size: Ø100mm--Ø150mm.
Series of balls according to the chrome percentage:
High chrome casting ball: More than Cr:10%;
Medium chrome casting ball: Cr:3%-9%;
Low chrome Grinding ball: Cr:1%-3%.
Features of casting grinding balls
(1) High hardness: surface hardness of casting iron ball is to HRC 58-65. The tolerance of the core hardness and surface hardness is not over 2HRC;
(2) Good Impact Toughness: impact toughness of chrome balls is more than 4J/cm²;
(3) Low Broken Rate: the actual broken rate is not higher than 1%;
(4) Good Wear-resistant: the wearing rate of high cast iron ball is 30-50g/ton in cement industry, 350-430g in gold mines and even lower in some iron mines.
CHEMICAL COMPOSITION(%) | |||||||||
Type | C | Si | Mn | Cr | P | S | Mo | Cu | Ni |
ZQCr 13 | 2.0-3.2 | 0.3-1.2 | 0.3-1.5 | 11-13 | ≤0.10 | ≤0.06 | 0-1.0 | 0-0.08 | -- |
ZQCr 17 | 2.0-3.0 | 0.3-1.3 | 0.3-1.5 | 15-18 | ≤0.10 | ≤0.06 | 0-1.0 | 0-0.08 | -- |
ZQCr 20 | 2.0-2.8 | 0.3-1.0 | 0.3-1.5 | 18-22 | ≤0.10 | ≤0.06 | 0-1.0 | 0-0.08 | -- |
ZQCr 26 | 2.0-2.8 | 0.3-1.0 | 0.3-1.5 | 22-28 | ≤0.10 | ≤0.06 | 0-1.0 | 0-0.08 | -- |
HRC | Impact toughness ak(J/cm2) | Time of falling balls | Microstructure | ||||||
58-66 | ≥4.0 | ≥15000 | M+C | ||||||
M - Martensite C - Carbide |
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