Low chrome multielement alloy cast ball and preparing method thereof

Abstract

The invention discloses a low chrome multielement alloy cast ball which comprises chemical compositions of, by weight percentage, carbon of 1.4-2.5%, silicon of 0.75-0.82%, manganese of 0.46-0.9%, chromium of 2.0-2.8%, phosphorus of <=0.02%, sulphur of <=0.02%, copper of 0.04-0.05%, molybdenum of 0.02-0.03%, nickel of 0.02-0.03%, wolfram of 0.01-0.02%, compound heavy rare earth spheroidizing agent of 0.13-0.15%, and the balance iron. The preparing method includes heating an as-cast low chrome multielement alloy cast ball to 950-1000 DEG C, subjecting the cast ball to an oil cooling treatment after 2-3 hours of heat insulation, when the surface temperature of the as-cast low chrome multielement alloy cast ball is reduced below 250 DEG C, removing the product from an oil pool, stopping the oil cold treatment, and subjecting the product to a tempering treatment in a tempering furnace. The low chrome multielement alloy cast ball and the preparing method thereof solve the problem of poor quality in use of the low chrome multielement alloy cast balls in the as-cast condition. By means of the low chrome multielement alloy cast ball and the preparing method thereof, the products have no cracks; rigidity, toughness and impact anti-fatigue life are increased, consumption is reduced, ball crushing rate is low, a mass of chromium alloy resources are saved, and operating cost is reduced for users.

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 a low-chromium multi-element alloy casting ball and the quenching heat treatment process thereof. technical background: [0002] Chromium alloy casting ball is a kind of grinding medium widely used in cement, thermal power, magnetic powder, ore dressing and other powder engineering. Various production enterprises and scientific research units are constantly exploring and developing new processes, so choosing a suitable heat treatment process is the key to improving chromium alloy casting balls and casting segments. [0003] At present, there are three types of chromium-based alloy casting balls produced at home and abroad: high-chromium alloy casting balls and casting sections, low-chromium alloy casting balls and casting sections, and low-chromium alloy casting balls and casting sections. Chinese patent 20041004...

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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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