Low-chromium multi-component alloy cast ball and preparation method thereof

Abstract

The invention discloses a low-chromium multi-component alloy cast ball, which contains the following chemical components in percentage by weight: 1.9-2.2% of carbon, 0.75-0.82% of silicon, 0.22-0.9% of manganese, 2.2-2.5% of chromium, not more than 0.02% of phosphorus, not more than 0.02% of sulfur, 0.04-0.05% of copper, 0.02-0.03% of molybdenum, 0.02-0.03% of nickel, 0.01-0.02% of tungsten, 0.13-0.15% of yttrium-based heavy rare earth compound modifier and the balance of iron. The preparation method of the cast ball comprises the steps of: heating cast-state low-chromium multi-component alloy cast ball to 950-1000 DEG C, carrying out thermal insulation for 2-3 hours, carrying out oil cooling treatment, taking out the product out of an oil pool when the surface temperature of the low-chromium multi-component alloy cast ball decreases below 250 DEG C, terminating oil cooling, and tempering the product in a tempering furnace. According to the invention, the problem that the low-chromium multi-component alloy cast ball is poor in cast-state use quality is solved, the product is flawless, the hardness, toughness and anti-fatigue impact life are improved, the consumption is reduced, the ball breaking rate is low, a great amount of chromium alloy resources are saved for China, and the operating cost is lowered 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...

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.

Images