Method for deoxidization and alloying by using ferro-silico-manganese alloy

Abstract

The invention relates to a method for deoxidization and alloying by using a ferro-silico-manganese alloy. The method comprises the following steps of: firstly detecting the content of dissolved oxygen in a converter, taking 600-1300ppm as the end point of the converter when the content of dissolved oxygen in the converter is blown to 600-1300ppm, secondly adding the ferro-silico-manganese alloy to a steel ladle, stopping adding the ferro-silico-manganese alloy when the content of dissolved oxygen in the steel ladle reaches 100-300ppm, and thirdly inputting aluminium wires to the steel ladle by utilizing a wire feeding machine and stopping inputting the aluminium wires when the content of dissolved oxygen in the steel ladle reaches 15-35ppm, thus obtaining the smelted steel. The method has the following beneficial effects: silicon contained in the ferro-silico-manganese alloy in the molten steel is removed by utilizing the high content of the dissolved oxygen; and as the ferro-silico-manganese alloy is cheaper than the medium ferro-manganese alloys, the cost of smelting low-silicon and low-carbon steel can be lowered by adopting the method.

Description

technical field [0001] The invention relates to a method for deoxidation and alloying of silicon-manganese-ferroalloy. Background technique [0002] In the process of smelting low-silicon and low-carbon steel in the converter, it is necessary to deoxidize and alloy the molten steel so that the mass percentage of each chemical component in the molten steel meets the following requirements: carbon ≤ 0.10%, silicon ≤ 0.03%, phosphorus ≤ 0.02%, Sulfur ≤ 0.03, manganese 0.35-0.60%. It can be seen that in the above-mentioned steel types, since the content of silicon is quite low, in the prior art, materials containing silicon should be avoided for deoxidized and alloyed alloys, and aluminum manganese titanium, aluminum manganese calcium, and aluminum alloys are usually used. Wire and medium carbon ferromanganese are used as materials for deoxidation and alloying. Although the above types of materials have deoxidation and alloying properties, due to the high aluminum content of a...

AI Technical Summary

Problems solved by technology

[0004] The task of the present invention is to provide a method of using silicon manganese ferroalloy deoxidation alloying to solve the problems of high smelting cost and inclusions not easy to float, etc. method