Deoxidizing and desulfurizing metallurgical powder composition

Abstract

The invention relates to a deoxidizing and desulfurizing metallurgical powder composition. The composition comprises the following raw materials in percentage by weight: 42-88% of iron-based substrate powder, 10-30% of hard phase powder, 0.2-4% of aids, 2-10% of a deoxidizing agent and 3-8% of a desulfurizing agent, wherein the desulfurizing agent is formed by limestone, sodium carbonate, fluorite, calcium carbide, magnesium powder and caustic-calcined magnesite; and the deoxidizing agent is formed by metal aluminium powder and calcium aluminate powder. The composition has the following beneficial effects: the desulfurizing and deoxidizing effects are improved; and the composition has excellent compressibility and filling property, meets the requirements of production and has low production cost and wide range of application.

Description

technical field [0001] The invention relates to a metallurgical industry powder composition, in particular to a deoxidation and desulfurization metallurgical powder composition. Background technique [0002] Sulfur is a harmful element in steel. It can cause brittleness of steel. Different types of steel have certain requirements for sulfur content. Desulfurization must be carried out if the content exceeds the standard. Otherwise, steel products with excessive sulfur content are defective and waste products. Therefore , steelmaking process desulfurization is an important process step. Desulfurization in the steelmaking process is divided into hot metal pretreatment desulfurization, ladle desulfurization and refining deep desulfurization. As a desulfurizer, there are lime series, calcium carbide series, magnesium powder series and so on. According to the different original content and the expected content of final desulfurization, determine which desulfurizer to use and w...

AI Technical Summary

Problems solved by technology

From the point of view of the use effect, the single series of desulfurizers have relatively narrow functions, especially in ladles and refining furnaces, and the desulfurization effect is poor; in deep desulfurization and smelting special steel, due to the certain sulfur contained in metallurgical auxiliary materials and slag, the slag liquid and steel The balance of sulfur in the water moves to the molten steel, resulting in the phenomenon of increasing sulfur instead of desulfurization. In this way, the use of general desulfurizers during desulfurization cannot meet the needs of desulfurization. The process cost of using magnesium powder series is relatively high, and more auxiliary equipment is required.