Preparation method of iron-manganese-magnesium alloy deoxidizer for non-aluminum deoxidized steel

Abstract

The invention relates to a preparation method of an iron-manganese-magnesium alloy deoxidizer for non-aluminum deoxidized steel, which comprises the following steps: sequentially adding a magnesium-manganese interalloy, low-carbon ferromanganese and steel scrap into a line frequency furnace; after finishing adding all the raw materials, smelting until the melt is molten down, removing the scum, quickly casting an ingot in a water-cooled mold, cooling the cast ingot, and mechanically crushing into a 20-50mm block sample. The production process is simple and easy to control; the alloy product is free of aluminum, contains 5-10% of magnesium, has the advantages of high deoxidizing power, high specific gravity, stable chemical properties and high alloy yield; the addition of the molten steel can not result in acute rolling of the melting bath, and can not generate the phenomenon of splashing; and when being specially used for secondary treatment of non-aluminum deoxidized steel, the deoxidizer can effectively purify the molten steel, lower the size of the non-metallic inclusions in the steel and reduce the damage of the non-metallic inclusions on the properties of the steel, thereby being a high-grade molten steel deoxidizer and inclusion refiner.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a preparation method of an iron-manganese-magnesium alloy deoxidizer for non-aluminum deoxidized steel. Background technique [0002] In iron and steel metallurgical production, compound deoxidizers such as silicon manganese are usually used; due to the weak deoxidation ability of silicon and manganese, the residual oxygen content in steel is high, and liquid inclusions are easy to form. Under the action of the flow field of molten steel, the inclusions The collision and aggregation tend to grow larger, resulting in an increase in size, which seriously restricts the comprehensive performance of this type of steel. [0003] In recent years, molten steel magnesium treatment technology has attracted great attention. Magnesium treatment can significantly refine non-metallic inclusions in steel and reduce the hazards of inclusions in steel. However, because magnesium m...

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Problems solved by technology

[0005] But some steel grades are sensitive to alumina (Al 2 o 3 ), calcium aluminate ( m CaO· n al 2 o 3 ) and other brittle inclusions are extremely sensitive, so metal aluminum is not suitable as a deoxidizer; in addition, some steel types must strictly control the metal aluminum content, such as cord steel, which requires that the dissolved aluminum in the steel be controlled at 0.0005~0.0010%; high-level For spring steel, it is required that the dissolved aluminum in the steel be less than 0.005%; for high-speed railway heavy rail steel, it is required that the dissolved aluminum in the steel is less than 0.001%