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Bainite ductile iron grinding ball and its producing process

A technology of nodular cast iron and bainite, applied in the field of bainite nodular cast iron grinding balls and its production process, can solve the problems of easy pollution of the quenching medium, high production cost, unstable quality, etc., and achieve large-scale industrial production , Improve the performance of the grinding ball, and the production process is simple and easy

Active Publication Date: 2009-01-14
YUNNAN KUNGANG WEAR RESISTANT MATERIAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of existing grinding balls such as complex process, long process, large energy consumption, easy pollution of the quenching medium, high production cost, and unstable quality, the present invention provides a nodular cast iron grinding ball with a bainite multiphase structure. Ball and its production process

Method used

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  • Bainite ductile iron grinding ball and its producing process
  • Bainite ductile iron grinding ball and its producing process
  • Bainite ductile iron grinding ball and its producing process

Examples

Experimental program
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Effect test

Embodiment 1

[0030] (1) Smelting in an intermediate frequency induction furnace to obtain ductile iron with the following mass ratio (wt.%): C 3.4%; Si 3.1%; Mn 3.0%; Mg 0.05%; Re 0.05%; P≤0.1%; S≤0.04 %; the rest is Fe. Before being released from the furnace, a rare earth ferrosilicon-magnesium alloy is added as a nodulizer according to 1.5% of the mass of molten iron, and then a ferrosilicon alloy with a mass ratio of 75% is added as an inoculant according to 1% of the molten iron mass, and the temperature of the molten iron is controlled at 1450-1480 ℃;

[0031] (2) The molten iron in step (1) is cast into shape according to the following method: the casting of the grinding ball adopts vacuum solid mold casting (EPC). First bond the shape of the grinding balls into strings, then coat with EPC special paint about 1mm thick, bake at 50-60℃ for 2-4 hours; when modeling, first put the sand box on the vibration table, fill Put in the bottom sand, after vibrating for 30s, scrape the bottom ...

Embodiment 2

[0039] (1) Smelting in an intermediate frequency induction furnace to obtain ductile iron with the following mass ratio (wt.%): C 3.8%; Si 2.8%; Mn 3.3%; Mg 0.03%; Re 0.03%; P≤0.1%; S≤0.04 %; the rest is Fe. Melting process is identical with embodiment 1;

[0040] (2) casting process is identical with embodiment 1, and the diameter of prepared grinding ball is 100mm;

[0041] (3) Perform the following heat treatment on the cast ductile iron grinding ball:

[0042] a. Heat the grinding ball to the austenite zone, select the temperature as 880°C, and keep it warm for 2 hours;

[0043] b. Atomize the water, then spray it continuously on the ball for cooling, and control the pressure of the water flow to 0.16MPa, until the temperature of the ball reaches 280°C, stop spraying;

[0044] c. Pile the spray-cooled grinding balls in a closed container, and use the waste heat of the grinding balls to keep warm for 3 hours;

[0045] d. Take the grinding ball out of the container and c...

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Abstract

The present invention relates to grinding ball of bainite ductile iron and its production process. The grinding ball of bainite ductile iron consists of C 3.4-3.8 wt%, Si 2.8-3.3 wt%, Mn 2.9-3.4 wt%, Mg 0.03-0.05 wt%, Re 0.03-0.05 wt%, P not more than 0.1 wt%, S not more than 0.04 wt% and Fe for the rest. The production process includes smelting in an MF inducing electric furnace and vacuum casting to form grinding ball of bainite ductile iron, the subsequent heat treatment under controlled cooling to obtain complex phase bainite structure, and final low temperature tempering. The made grinding ball has needle like bainte as main component, small amount of martensite and residual austenite, average surface hardness of HRC 56-58, average volume hardness of HRC 50-55, impact toughness of 16-20 J / sq cm and excellent comprehensive mechanical performance.

Description

technical field [0001] The invention relates to a bainite ductile iron grinding ball and a production process thereof, belonging to the technical field of metal materials and their preparation. Background technique [0002] Ball mills are widely used in mining, metallurgy, building materials, electric power, chemical industry and other fields. As the main consumable parts, the grinding balls in the ball mill have a huge demand. The grinding balls used at home and abroad are mainly divided into forged steel balls and cast iron balls. Among them, the ductile iron balls with bainite multiphase structure have been widely used due to their excellent comprehensive mechanical properties, especially wear resistance, and become the anti-corrosion It is an ideal material for abrasive wear, and is suitable for occasions such as wear resistance, impact resistance, high strength, high toughness and fatigue resistance. [0003] At present, there are mainly the following ways to obtain du...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/10C22C33/08C21D9/36C21D11/00C21D1/667C21D1/18C22C33/10B22C9/12B22C9/02B02C17/20
Inventor 周荣蒋业华胡国忠张玉勤周荣锋黎振华卢德宏
Owner YUNNAN KUNGANG WEAR RESISTANT MATERIAL SCI
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