Medium chromium multielement alloy cast ball and cast segment oil quenching heat treatment technique

Abstract

The invention discloses a medium chromium multielement alloy cast ball and cast segment oil quenching heat treatment technique, wherein the contained components are as follow: 1.7-3.1 of C, 0.3-1.0 ofSi, 0.3-1.0 of Mn, 5-10 of Cr, less than or equal to 0.09 of S, less than or equal to 0.08 of P, and trace of Mo, Ni, Nb, Cu, Y, B, V and Ti; cast medium chromium multielement alloy cast ball and cast segment are heated to 930-1050 DEG C, the temperature is kept for 1.5-3h followed by oil cooling treatment, when the surface temperature of medium chromium multielement alloy cast ball and cast segment are decreased to 100-250 DEG C, the product is moved off the oil tank to halt oil quenching, and the product is poured into an iron bucket, when the iron bucket is full the product is put into a tempering furnace for tempering treatment. The invention solves the problem of poor use quality as cast condition of the medium chromium multielement alloy cast ball and cast segment, in addition, theproduct has no crack, the hardness, toughness and antifatigue impact service life is improved, consumption is reduced, and the ball fragmentation rate is low, thus saving quantities of chromium alloyresource for the nation and reducing operation cost for the user.

Description

Technical field: [0001] The invention relates to a heat treatment process for quenching chromium alloy cast steel and chromium alloy cast iron, in particular to an oil quenching heat treatment process for medium chromium multi-element alloy casting balls and casting segments. 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, medium-chro...

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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 and low cost, but low product hardness, low impact toughness, poor comprehensive mechanical properties, high user cost; medium 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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