High Chrome Grinding Ball
Size of casting iron ball:
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.
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CHEMICAL COMPOSITION(%)
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Type
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C
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Si
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Mn
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Cr
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P
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S
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Mo
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Cu
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Ni
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ZQCr 13
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2.0-3.2
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0.3-1.2
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0.3-1.5
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11-13
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≤0.10
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≤0.06
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0-1.0
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0-0.08
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--
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ZQCr 17
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2.0-3.0
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0.3-1.3
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0.3-1.5
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15-18
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≤0.10
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≤0.06
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0-1.0
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0-0.08
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--
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ZQCr 20
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2.0-2.8
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0.3-1.0
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0.3-1.5
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18-22
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≤0.10
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≤0.06
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0-1.0
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0-0.08
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--
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ZQCr 26
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2.0-2.8
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0.3-1.0
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0.3-1.5
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22-28
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≤0.10
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≤0.06
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0-1.0
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0-0.08
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--
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HRC
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Impact toughness ak(J/cm2)
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Time of falling balls
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Microstructure
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58-66
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≥4.0
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≥15000
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M+C
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M - Martensite C - Carbide
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