A kind of preparation technology of alloy cast iron grinding ball

Abstract

The invention discloses a preparation process of an alloy cast iron grinding ball. The alloy cast iron grinding ball comprises the following components in percentage by weight: 2.30-2.50 percent of C, 0.90-1.20 percent of Si, 1.30-1.50 percent of Mn, 2.0-3.0 percent of Cr, 0.15-0.25 percent of V, 0.02-0.06 percent of B, 0.07-0.09 percent of Ce, less than 0.03 percent of P, less than 0.03 percent of S and the balance of Fe and inevitable impurities. The preparation process comprises the following steps of: 1) burdening; 2) smelting; 3) pouring; and 4) carrying out isothermal quenching thermal treatment. The preparation process has the benefits that the abrasion resistance is improved under the synergistic effect of various alloy elements of alloy cast iron; by adopting the isothermal quenching and heat treatment process, a microstructure of the grinding ball is further improved, the form and the distribution of carbide are improved, and further, the toughness of the grinding ball is improved; compared with the existing grinding ball containing chrome cast iron, the grinding ball is prolonged by more than 2-3 times in service life, and does not crack during use.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a preparation process of alloy cast iron grinding balls. Background technique [0002] Chromium series alloy cast grinding balls are the main consumable materials widely used in metallurgical beneficiation, cement building materials, thermal power generation and other industries. At present, the grinding balls are all cast iron grinding balls with high carbon content, and the chemical composition in terms of weight percentage is C: 2-3.6, Si: 0.30-1.50, Mn: 0.40-1.50, Cr: 1.00-28, P<0.10 , S<0.06, the balance is Fe. The casting process is mostly manual metal mold molding, and the heat treatment process is mostly air-cooled and quenched, and some are oil-cooled and quenched. [0003] At present, the domestic grinding ball market is basically all cast iron grinding balls except forged balls. According to the chromium alloy content, there are mainly low chr...

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Problems solved by technology

[0003] At present, the domestic grinding ball market is basically all cast iron grinding balls except forged balls. According to the chromium alloy content, there are mainly low chromium (ZQCr2), medium chromium (ZQCr5), high chromium (ZQCr12), ultra-high chromium (ZQCr15, ZQCr20, ZQCr26) and other six products, the first two are non-quenched grinding balls, which have low hardness, poor wear resistance, and serious waste of resources; although the latter four have better wear resistance, the cost is higher, especially with the development of chromium in recent years. With the soaring price of iron, the production cost is getting higher and higher, and its cost-effective advantage is gradually losing

[0004] Based on the above reasons, the existing products are all made of ordinary chromium-containing cast iron, with low density and poor toughness, and the wear resistance needs to be further improved

In addition, products with low chromium alloy content are not wear-resistant. Although the wear resistance of high chromium alloy content is improved, the toughness is poor. Usually, it is easy to cause chipping during the use of the grinding ball, and the chipping not only affects the wear resistance of the grinding ball itself. service life, and at the same time may bring pollution to the grinding material, resulting in the scrapping of the grinding material

With the development of technology and the improvement of requirements, the traditional chromium-containing cast iron grinding balls with chromium as the main hardening alloy element are increasingly unable to meet the actual needs of production.