Ultrahigh chromium cast grinding ball and heat treatment process thereof

Abstract

The invention discloses an ultrahigh chromium cast grinding ball and a heat treatment process thereof. By the optimized adjustment on chemical components and a quenching process of the traditional ultrahigh chromium cast grinding ball ZQCr26, the hardenability of the grinding ball is improved by adopting an oil quenching process without adding noble metals, such as Mo, Ni, and the like; a proper number of slow cooling agent is added into the quenching oil, the cooling speed is properly reduced, and the cracking of the grinding ball in the oil quenching process is effectively prevented; and the product has the characteristics of low cost, even internal and external hardness, high hardness, good abrasive resistance and favorable fatigue impact resistance. The ultrahigh chromium cast grinding ball used as an abrasive resistant material can be widely used for industries, such as cement, thermal power, mineral separation, and the like to grind powder.

Description

technical field [0001] The invention relates to a wear-resistant material used in cement, thermal power, ore dressing and other industries, in particular to an ultra-high chromium casting grinding ball and its heat treatment process. Background technique [0002] Cast grinding balls are commonly used wear-resistant materials in cement, thermal power and other industries, and ultra-high chromium cast ball ZQCr26 is favored by large enterprise groups for its good wear resistance. However, because the traditional heat treatment process adopts air quenching or air quenching, the hardenability of this quenching process is poor, the hardness of the produced grinding balls is uneven, and the hardness difference between the surface and the center is relatively large. Therefore, Mo must be added to the composition of the ultra-high chromium casting ball ZQCr26 , Ni and other precious metals to improve hardenability, its main chemical composition is 2.00-3.60% C, 0.3-1.50% Si, 0.40-1....

AI Technical Summary

Problems solved by technology

However, because the traditional heat treatment process adopts air quenching or air quenching, the hardenability of this quenching process is poor, the hardness of the produced grinding balls is uneven, and the hardness difference between the surface and the center is relatively large. Therefore, Mo must be added to the composition of the ultra-high chromium casting ball ZQCr26 , Ni and other precious metals to improve hardenability, its main chemical composition is 2.00-3.60% C, 0.3-1.50% Si, 0.40-1.50% Mn, 1.00-28% Cr, P≤0.10%, S≤0.06%, 0.3 -2.0% Mo, 0.5-1.0% Ni, the balance is Fe

Due to the shortage of precious metal resources such as Mo and Ni, the cost of the existing ultra-high chromium casting ball ZQCr26 is high, which makes many enterprises discouraged

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