Production method of ultrahard high-chromium cast grinding ball

Abstract

The invention relates to a production method of an ultrahard high-chromium cast grinding ball. The ultrahard high-chromium cast grinding ball comprises the following chemical components: 1.8-3.2 percent of carbon (C), 0.3-1.0 percent of silicon (Si), 0.2-0.9 percent of manganese (Mn), 10.0-10.5 percent of chromium (Cr), 0.02-0.1 percent of phosphorus (P), 0.02-0.1 percent of sulphur (S), 0.02-0.1 percent of copper (Cu), 0.02-0.1 percent of molybdenum (Mo), 0.02-0.1 percent of nickel (Ni), 0.02-0.1 percent of wolfram (W), 0.1-0.2 percent of rare-earth yttrium (Y-Re) and 80.1-83.7 percent of iron (Fe). In the invention, the rare-earth yttrium is adopted to carry out modification treatment so as to change the shapes and the distribution of carbides, thereby breaking nets; meanwhile, crystal particles are refined, tissues are thickened, and the toughness is improved. An oil-medium quenching and tempering heat treatment process is adopted to obtain a eutectic carbide of a martensite and a broken net, the hardness of the high-chromium grinding ball achieves HRc64 to 66, and the toughness and the abrasive resistance of the high-chromium grinding ball are obviously improved. The grinding ball is tried in ball grinders of various factories in cement industry, the abrasion is reduced by 20-32 percent on year-on-year basis, and the running cost of the ball grinder is obviously reduced.

Description

technical field [0001] The invention relates to a grinding medium, that is, a casting grinding ball and a production process method. Background technique [0002] As a grinding medium, grinding balls are widely used in powder engineering in industries such as building materials, cement, mining metallurgy, energy thermal power, non-metal processing, coal water slurry and magnetic materials. Due to the need to meet the requirements of different equipment and different working conditions in various industries, the materials for manufacturing grinding balls are various, such as forged steel balls, nodular cast iron grinding balls, chromium alloy casting grinding balls, etc., and the specifications are also from arrive even larger diameters. [0003] High chromium casting grinding ball is a new generation of high-efficiency grinding ball developed from ordinary forged steel ball and low chromium casting grinding ball. Its chromium content is more than 10%. The known heat trea...

AI Technical Summary

Problems solved by technology

In addition, the production equipment of high-chromium alloy casting grinding balls requires a large investment and the production process is relatively complicated, which leads to the continuous increase of the cost of high-chromium casting grinding balls, which brings considerable pressure to the manufacturers and users of grinding balls; On the one hand, in cement, mining and other industries, the diameter, power and production capacity of ball mills are developing towards large-scale and high-efficiency. It is hoped that the hardness of the grinding balls will be higher and the wear will be lower, so as to create better economic and social benefits. Currently, domestic The quenched hardness of high chromium cast grinding balls is only HRc52-56, which is far from meeting the requirements of domestic and foreign markets.

Images