Commercial high-efficiency refining deoxidizer and preparation method thereof

Abstract

The invention provides a commercial high-efficiency refining deoxidizer. The deoxidizer comprises high-purity rare earth element lanthanum and cerium, wherein the purity of the lanthanum and the cerium is both 99.9% or above, and the high-purity lanthanum and the cerium combination has a strong deoxidation effect on molten steel; in the process of deoxidizing the molten steel by using the lanthanum and the cerium as a composite deoxidizing agent, the adding amount is less, and is between 0.015 and 0.03%, the size of inclusions in the molten steel is reduced by a small amount of lanthanum and cerium, so that the cleanliness and the mechanical property of a steel part are improved; and in the process of deoxidizing the molten steel, the inclusions brought by the lanthanum and the cerium in the molten steel are presented with a floating state, and are easy to remove, the residual of microelements is reduced, and the toughness and the wear resistance of the steel part are increased. According to the commercial high-efficiency refining deoxidizer, the high-purity rare earth element lanthanum and cerium are combined, deep high-efficiency deoxidation is achieved, structure crystal grainsof the steel part are refined, the flowing property of the molten steel is improved, under the condition that a smelting condition is not changed, the nozzle clogging is reduced or eliminated, the product quality of the steel part is improved, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a commercial high-efficiency refining deoxidizer and a preparation method thereof. Background technique [0002] In recent years, with the development of industry, people have higher and higher requirements for the performance of steel, so the requirements for the control of components in steel have also increased. During the smelting process, in order to improve the quality of steel, a large amount of oxygen is filled into the molten iron, so that the harmful elements in the molten steel are emulsified on the surface of the molten steel, and the harmful elements in the molten steel are finally removed. The main element in molten steel is carbon. The reaction between carbon and oxygen can generate power, accelerate the reaction, and facilitate the floating of non-metallic inclusions and the discharge of harmful gases. But there is an equilibrium relationship between ...

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Problems solved by technology

[0003] The commonly used deoxidizers in the prior art usually contain Al and silicon aluminum barium calcium etc., but on the one hand, these deoxidizers are used in a large amount, and the addition amount of aluminum-based deoxidizers is usually 0.03-0.08%, and the cost is high; During the deoxidation process of molten steel, the deoxidizer will lead to a high amount of Al2O3 inclusions in molten steel, poor casting performance of molten steel, and poor mechanical properties such as strength and toughness of steel parts obtained.

In addition, the deoxidizing effect of existing deoxidizers during use is not obvious enough

The degree of purification of molten steel is insufficient, and it is difficult to meet the standards of some high-end steel grades that require high oxygen content, which affects the performance of the final product

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