Low-titanium low-sulfur ferrochrome and production method thereof

Abstract

The invention provides low-titanium low-sulfur ferrochrome and a production method thereof, and belongs to the technical field of ferrochrome. Chromite, coke, silica powder, lime powder, a titanium removal agent, a desulfurizing agent and a slag former are used as raw materials; the low-titanium and low-sulfur ferrochrome is obtained through oxygen blowing melting, titanium removal and desulfurization, carbon addition, dephosphorization and desulfurization, refining and continuous casting after chromite is pretreated. The final slag is controlled to be in a CaO-Al2O3-SiO2-MgO four-source slag type; the mass percent of TiO2 in the chromite is less than or equal to 0.5%, the mass percent of S is less than or equal to 0.2%, and the mass percent of P is less than or equal to 0.3%. The production process is simple, the production cost is obviously lower than that of the prior art, the smelting process technology is reasonable, an industrial submerged arc furnace is adopted for continuous smelting, the product state is good, components are stable, meanwhile, the content of undesirable impurities such as Ti, P and S in the ferrochrome alloy is obviously reduced, and the strength, toughness, ductility and abrasion resistance of the obtained product are all obviously improved.

Description

technical field [0001] The invention relates to the technical field of ferrochromium alloys, in particular to a low-titanium and low-sulfur ferrochromium and a production method thereof. Background technique [0002] Bearing is a mechanical part used to support the transmission shaft and bear the load. It is a commonly used wearing part in the machinery and equipment manufacturing industry, and its use and consumption are very large. The quality of the bearing will directly affect the performance of the mechanical equipment, and the quality of the bearing is mainly determined by the performance of the bearing steel material. With the rapid development of my country's bearing industry, the demand for high-quality bearing steel with excellent performance is also increasing. [0003] Ferrochromium is the most important raw material for the production of stainless steel, mainly used in the production of stainless steel, ball bearing steel, tool steel, nitrided steel, heat-stren...

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Problems solved by technology

This production method has high energy consumption, relatively complex process equipment, and because China is a chromium-poor country, chromium resources are extremely tight, and this process inevitably leads to a low recovery rate of the main element chromium

[0006] Although the patent CN101962714B only uses an ordinary submerged arc furnace for selective reduction to produce low titanium and high chromium, this method can only guarantee Ti<0.03%, and the Ti content of the finished product inevitably fluctuates with the furnace conditions, and the pass rate cannot be guaranteed

And due to the relatively high titanium content, the product cannot be used in the production of high-precision bearing steel

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