High-carbon microalloying steel ball and production process thereof

Abstract

The invention discloses a production process of a high-carbon microalloying steel ball. The production process comprises the following steps of: heating a steel ball blank to be 1,200-1,250 DEG C and forging the steel ball blank to a steel ball of which the size is required; precooling the steel ball until the temperature of the surface layer of the steel ball is 800-850 DEG C; putting the steel ball into clear water at the temperature of 30-60 DEG C to quench until the temperature of surface layer of the steel ball is reduced to 280-340 DEG C, and taking out the steel ball; 1-2s later, putting the steel ball into mechanical oil at the temperature of 30-50 DEG C to quench until the temperature of surface layer of the steel ball is reduced be below 60 DEG C; taking out the steel ball and putting the steel ball into mechanical oil at the temperature of 200-240 DEG C to temper for not less than 4 hours; and taking out and finishing the steel ball to obtain a steel ball finished product, wherein according to the weight percentage, the steel ball contains 0.90-1.05 percent of C, 0.30-0.70 percent of Si, 0.80-1.20 percent of Mn, 0.25-0.40 percent of Cr and the balance being Fe and inevitable impurities. The high-carbon microalloying steel ball is prepared by using the production process, and the quenching and cracking of the steel ball can be effectively avoided; and compared with the conventional high-carbon microalloying steel ball, the prepared high-carbon microalloying steel ball has the same performance, and obviously reduces alloy contents and production cost.

Description

technical field [0001] The invention relates to a steel ball for a ball mill, more specifically, to a high-carbon micro-alloyed steel ball and a production process thereof. Background technique [0002] For the manufacture of steel balls for forging and rolling waste heat ball mills, the main component of steel balls is usually 0.60-0.85% C content, and appropriate Si and Mn elements are added. According to the different requirements of poor hardness, the steel ball is supplemented by adding appropriate amount of Cr, Mo, Ni, Cu, V, Nb and other elements to improve the hardness, wear resistance and corrosion resistance of the steel ball. [0003] Carbon is the cheapest and most effective strengthening element in steel, but if the carbon content in the steel ball is further increased, the steel ball will crack during the quenching process of a single quenching medium such as clear water, making the steel ball unusable, thus limiting The increase of carbon content in steel bal...

AI Technical Summary

Problems solved by technology

[0003] Carbon is the cheapest and most effective strengthening element in steel, but if the carbon content in the steel ball is further increased, the steel ball will crack during the quenching process of a single quenching medium such as clear water, making the steel ball unusable, thus limiting The increase of carbon content in steel balls, and the alloying elements are expensive and cannot be recycled during use, which makes it difficult to effectively improve the manufacturing cost and use efficiency of high-performance steel balls

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