A low-carbon high-chromium wear-resistant ball and its preparation process

Abstract

The invention provides a low-carbon high-chromium abrasion-resistant ball and a preparation technique thereof. The low-carbon high-chromium abrasion-resistant ball is prepared from, by mass, 2.35%-2.46% of carbon, 0.85%-1.12% of silicon, 0.45%-0.6% of manganese, 18%-22% of chromium, 0.2%-0.25% of aluminum, 0.1%-0.18% of titanium, 0.05%-0.1% of tantalum, 0.1%-0.12% of boron, 0.02%-0.04% of niobium, 0.01%-0.03% of zirconium, 0.01%-0.025% of sulfur, 0.01%-0.025% of phosphorus, 0.2%-0.24% of nitrogen, and the balance ferrum and inevitable impurities. The low-carbon high-chromium abrasion-resistant ball is prepared through the steps of smelting, pouring, quenching, tempering and the like, the content of the carbon element is decreased, and nitrogen is introduced in the smelting process, so that the abrasion resistance of the ball is improved through formed metal nitride; and meanwhile, the situation that the hardenability is reduced due to excessive carbide is avoided. The quenched HRC of the low-carbon high-chromium abrasion-resistant ball is equal to or higher than 65, the impact fatigue life of the low-carbon high-chromium abrasion-resistant ball is equal to or longer than 19600 times, and the breakage rate of the low-carbon high-chromium abrasion-resistant ball is equal to or lower than 2.5%.

Description

technical field [0001] The invention relates to the technical field of wear-resistant balls, in particular to a low-carbon, high-chromium wear-resistant ball and a preparation process thereof. Background technique [0002] The ball mill is the key equipment for crushing the material after it is crushed. It is widely used in cement, silicate products, new building materials, refractory materials, chemical fertilizers, black and non-ferrous metal beneficiation, glass ceramics and other production industries, for dry or wet grinding of various ores and other grindable materials. The steel ball is an important part in the ball mill. Its main function is to impact and crush the material, and it also plays a certain grinding role. The quality of the steel ball will have a direct impact on the crushing effect and grinding efficiency, and ultimately Affect the output of the ball mill, therefore, the steel ball should have high enough strength and impact resistance. [0003] In CN1...

AI Technical Summary

Problems solved by technology

[0003] In CN105112768A disclosed in China, the wear resistance of grinding balls has been improved, and a vanadium-titanium alloy wear-resistant cast ball is proposed, which promotes the formation of carbides by adding vanadium content to improve hardness, but the carbide content is too high. High content will lead to a decrease in the content of solid solution alloy elements, low matrix strengthening, and poor hardenability, and vanadium is also an element that reduces hardenability. A large amount of vanadium is not conducive to the toughness of the grinding ball, and the comprehensive mechanical properties are poor.