Carbide-containing ausferrite spheroidal graphite cast iron grinding ball and manufacturing method thereof

A technology of nodular cast iron and carbide, which is applied in the field of cast iron alloys, can solve the problems of poor stability of mechanical properties, poor wear resistance, and easy occurrence of broken balls, etc., and achieve the effects of high impact fatigue life, improved mechanical properties, and improved grinding efficiency

Inactive Publication Date: 2010-12-08
HEBEI UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide carbide-containing ausferitic nodular cast iron grinding balls and a manufacturing method thereof, which uses a sand-coated metal mold casting process to form a certain amount of carbides and graphite in the as-cast structure of the grinding balls The ball, and then, through the austempering process, obtain the ausferic matrix with excellent comprehensive mechanics. Since a certain amount of carbides are distributed in the ausferic matrix, the carbide-containing ausfertic ductile iron grinding ball has high wear resistance and toughness, thereb

Method used

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  • Carbide-containing ausferrite spheroidal graphite cast iron grinding ball and manufacturing method thereof
  • Carbide-containing ausferrite spheroidal graphite cast iron grinding ball and manufacturing method thereof
  • Carbide-containing ausferrite spheroidal graphite cast iron grinding ball and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The first step, raw material preparation and smelting

[0029] According to the mass percentage of the elements, it is 3.6%C, 2.5%Si, 2.5%Mn, 0.6%Cr, <0.07%P, <0.025%S, 0.04%Mg, 0.03%Re and the rest is Fe, and the raw materials are prepared. The raw materials are put into the intermediate frequency induction furnace, and the temperature is raised until all the raw material components are melted and smelted into ausferitic nodular cast iron raw iron liquid, and the furnace temperature is 1500 °C;

[0030] The second step, spheroidization and inoculation

[0031]Spheroidizing and inoculating the ausferitic nodular cast iron raw iron melt produced in the first step, the nodulizing agent adopts the mass percentage of element components of 5-7% Mg, 1-3% Re, 40-45% % Si and the rest of the rare earth ferrosilicon-magnesium alloy of iron, the addition amount is 1.4% by weight of the original molten iron weight of ausferic ductile iron; Barium-containing ferrosilicon alloy co...

Embodiment 2

[0035] The first step, raw material preparation and smelting

[0036] According to the mass percentage of the elements, it is 3.7%C, 3.2%Si, 3.5%Mn, 1.5%Cr, <0.06%P, <0.025%S, 0.03%Mg, 0.02%Re and the rest is Fe, and the raw materials are prepared. The raw materials are put into an intermediate frequency induction furnace, and the temperature is raised until all the raw material components are melted and smelted into ausferitic nodular cast iron raw iron liquid, and the furnace temperature is 1550 °C;

[0037] The second step, spheroidization and inoculation

[0038] Spheroidizing and inoculating the ausferitic nodular cast iron raw iron melt produced in the first step, the nodulizing agent adopts the mass percentage of element components of 5-7% Mg, 1-3% Re, 40-45% % Si and the rest of the rare earth ferrosilicon-magnesium alloy of iron, the addition amount is 1.8% by weight of the original molten iron weight of ausferic ductile iron; Barium-containing ferrosilicon alloy co...

Embodiment 3

[0042] The first step, raw material preparation and smelting

[0043] According to the mass percentage of the elements, it is 3.4%C, 3.0%Si, 2.8%Mn, 1.0%Cr, <0.08%P, <0.022%S, 0.05%Mg, 0.04%Re and the rest is Fe. Prepare the raw materials and prepare them The raw materials are put into an intermediate frequency induction furnace, and the temperature is raised until all the raw material components are melted and smelted into ausferitic nodular cast iron raw iron, and the furnace temperature is 1520 °C;

[0044] The second step, spheroidization and inoculation

[0045] Spheroidizing and inoculating the ausferitic nodular cast iron raw iron melt produced in the first step, the nodulizing agent adopts the mass percentage of element components of 5-7% Mg, 1-3% Re, 40-45% % Si and the rest of the rare earth ferrosilicon-magnesium alloy of iron, the addition amount is 1.15% by weight of the original molten iron weight of ausferic ductile iron; Barium-containing ferrosilicon alloy c...

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Abstract

The invention discloses a carbide-containing ausferrite spheroidal graphite cast iron grinding ball and a manufacturing method thereof, relating to a cast iron alloy containing spheroidal graphite. The grinding ball comprises the following chemical elements in percentage by mass: 3.3 to 3.7 percent of C, 2.4 to 3.3 percent of Si, 2.5 to 3.6 percent of Mn, 0.6 to 1.5 percent of Cr, less than 0.08 percent of P, less than 0.025 percent of S, 0.03 to 0.05 percent of Mg, 0.02 to 0.04 percent of Re and the balance of Fe. The preparation method of the grinding ball comprises the following steps of: (1) raw material preparation and smelting; (2) spheroidization and inoculation; and (3) isothermal quenching heat treatment. In the invention, a certain quantity of carbides and graphite balls are formed in a grinding ball casting-state structure by utilizing a sand lined metal casting technology; and an ausferrite base body with excellent comprehensive mechanical property is obtained by adopting an isothermal quenching technology; and as a certain quantity of carbides are distributed in the ausferrite base body, the carbide-containing ausferrite spheroidal graphite cast iron grinding ball has high wear resistance and toughness.

Description

technical field [0001] The technical scheme of the invention relates to a cast iron alloy containing nodular graphite, specifically a carbide-containing ausferite nodular cast iron grinding ball and a manufacturing method thereof. Background technique [0002] Iron ore is the main raw material for ironmaking and steelmaking. In the process of ironmaking production, the ore must be crushed and ground, which requires more than 1.8 million tons of grinding balls per year. The grinding balls consumed by the metallurgical and mining industries account for 70% of the total consumption of grinding balls. How to improve the service life of the grinding balls in the metallurgical and mining industry in the ironmaking production process to reduce production costs has always been a topic that domestic and foreign research institutions and production enterprises have paid attention to. [0003] At present, the grinding ball materials used in metallurgy, mining and cement industries mai...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C33/08B22D1/00C21D1/20C21D5/00
Inventor 刘金海李国禄郝晓燕赵雪勃王磊张纯伟张会友边泊乾王绍勤
Owner HEBEI UNIV OF TECH
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