Dia.20MM High Chrome Grinding Media Ball For Cement

Specifications

Dia.20MM High Chrome Grinding Media Ball For Cement

1.Features of Cast Grinding Balls

1) In general, casting grinding ball has high hardness: surface hardness to 55-68 HRC, volume hardness of 53-63 HRC

2) impact toughness high: impact toughness more than 12 J / cm2.

3) broken rate is low: the actual broken rate is not higher than 1%. 

4) loss of grinding forged steel ball round rate is low

2.Material and Chemical Composition of Casting Grinding Ball

3.Physical Property of Casting Grinding Ball

4. Specification of Cast Grinding Balls

5.High chrome cast balls
Size: 20mm-120mm

Hardness:HRC58-65; Chrome content:11-14%

6.Low chrome cast balls
Size: 20mm-120mm
Hardness:HRC45-55; Chrome content:1-3.5%

7.Main Process of Casting Grinding Balls

(1)Raw material (2)Scientific Proportioning (3)Electric Furnace Smelting (4)Assay Before Furnace (5)Mould Forming (6)Polishing (7)Heat Treatment (8)Qualified Products (9)Packing

8.Applied Field

1)Cement Plants 2)Mines 3)Power stations 4)Chemical Industries 5)Grinding Mill, Ball mill, Coal mill

9. Products Name

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10.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.