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

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...

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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, thereby overcoming the difficulty in controlling the on-site process parameters in the prior art, which leads to unstable quality of the grinding balls; the polystyrene foam full-cast grinding balls are prone to black slag, the vacuum dry sand is compacted, and the cooling speed is slow, resulting in grinding balls Low volume hardness and poor wear resistance; the bainite structure obtained by continuous cooling is unstable, resulting in poor stability of mechanical properties, prone to broken balls, and the method of CN1035138 leads to uneven hardness distribution of grinding balls and many shortcomings of reduced volume hardness

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