Niobium-alloying high-chromium cast iron grinding ball and production technology thereof

Abstract

The invention relates to a niobium-alloying high-chromium cast iron grinding ball and a production technology thereof, and belongs to the field of new materials. The niobium-alloying high-chromium cast iron grinding ball is prepared from, by mass ratio, 2.5% to 3.0% of C, 0.3% to 0.8% of Si, 0.6% to 1.0% of Mn, smaller than 0.1% of P, smaller than 0.1% of S, 14.0% to 16.0% of Cr, 0.1% to 0.2% of Nb, 0.1% to 0.2% of RE and the balance Fe. According to the material performance, the use conditions and the problems of high-chromium white cast iron, a one-mold-multi-piece metal mold local-sand-covering grinding ball production technology is adopted, niobium alloying and rare earth modification are adopted, the structure of the high-chromium white cast iron is refined, the structural performance uniformity of the high-chromium white cast iron is improved, and the overall performance and the structural performance uniformity of the grinding ball are further improved through a semicontinuous decentralized quenching technology. Compared with a common high-chromium white cast iron grinding ball, the niobium-alloying high-chromium white cast iron grinding ball manufactured with the technology has the beneficial effects that the structure is refined, tenacity is greatly improved, and the abrasion resistance is better.

Description

Technical field [0001] The invention relates to a niobium alloyed high chromium cast iron grinding ball and its production process, belonging to the field of new materials. Background technique [0002] The ball mill is widely used in metallurgy, mining, building materials, electric power and chemical industries, but its system is quite severely worn. As the main grinding body of the ball mill, the steel ball accounts for about 85% of the wear-resistant materials. The wear resistance can not only reduce metal consumption and save energy, but also have extremely important significance for improving the production efficiency and product quality of the ball mill. [0003] The wear of the steel ball in the ball mill is a complicated process. In this process, the grinding ball is mainly subjected to abrasive cutting and chiseling, resulting in abrasive wear. In addition, in the process of colliding with abrasives and lining plates, due to insufficient toughness, other failure modes suc...

AI Technical Summary

Problems solved by technology

Among them: clay sand casting has lower cost, but coarse structure and poor performance; lost foam casting has high production efficiency and relatively low cost, but due to low cooling rate, coarse structure and poor performance; metal casting has fast cooling speed and low structure. Significant refinement, performance, especially toughness is significantly improved, but there are problems such as large one-time investment, good performance but low efficiency of a single mold, poor structure and performance uniformity of multiple molds, and easy loss of roundness during use.

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