Oil quenching heat treatment process for high-hardness low-chromium multicomponent alloy casting ball

Abstract

The invention discloses an oil quenching heat treatment process for high-hardness low-chromium multicomponent alloy casting ball. The high-hardness low-chromium multicomponent alloy casting ball contains the following components in percentage by weight: 1.5 to 2.0 percent of C, 0.3 to 1.0 percent of Mn, 2.0 to 2.8 percent of Cr, 0.78 to 0.80 percent of Si, 0.05 to 0.055 percent of Cu, less than or equal to 0.02 percent of S and less than or equal to 0.03 percent of P, wherein Fe is used as a substrate. The oil quenching heat treatment process comprises the following steps of: heating the high-hardness low-chromium multicomponent alloy casting ball to the temperature of between 950 and 1,050 DEG C, and keeping the temperature for 2 to 3 hours; performing oil cooling; after the surface temperature of the high-hardness low-chromium multicomponent alloy casting ball is reduced to be below 250 DEG C, taking the casting ball out of an oil sump, and stopping performing the oil cooling; and putting the casting ball into a tempering furnace for tempering, and after the tempering is finished, quenching the casting ball again. By the oil quenching heat treatment process, the problem of poor cast quality of the high-hardness low-chromium multicomponent alloy casting ball is solved, the casting ball does not have cracks, the hardness and toughness are improved, the antifatigue impact service life is prolonged, consumption is reduced, the ball crushing rate is low, a large number of chromium alloy resources of the country are saved, and the running cost of users is also reduced.

Description

Technical field: [0001] The invention relates to a heat treatment process for quenching of chromium alloy cast steel and chromium alloy cast iron, in particular to an oil quenching heat treatment process for high-hardness and low-chromium cast balls. technical background: [0002] Chromium alloy casting balls and casting segments are a kind of grinding medium widely used in powder engineering such as cement, thermal power, magnetic powder, and mineral processing. Various production enterprises and scientific research units are constantly exploring and developing new processes to reduce consumption during use. Therefore, choosing an appropriate heat treatment process is the key to improving the quality of chromium alloy casting balls and casting segments. [0003] At present, there are three types of chromium-based alloy casting balls and casting sections produced at home and abroad: high-chromium alloy casting balls and casting sections, low-chromium alloy casting balls and ...

AI Technical Summary

Problems solved by technology

Chinese patent 200410041736X announced the oil quenching process of high chromium alloy casting balls. The high chromium alloy casting balls and casting segments processed by this process have high hardness, but the product performance is unstable, and the alloy content of high chromium alloy casting balls and casting segments High, high cost, large consumption of chromium resources; low chromium alloy cast balls, low alloy content of casting segments, low cost, but low product hardness, low impact toughness, poor comprehensive mechanical properties, high user cost; low chromium alloy cast balls The cost of the casting section is moderate, but at present, the product is only subjected to a low-temperature tempering treatment at home and abroad, and the as-cast structure cannot be changed, and its comprehensive mechanical properties such as hardness, toughness, and wear resistance are not ideal.

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