Straight-up manufacturing process for carrying out deoxidization smelting of aluminum-containing steel through cooperation of calcium carbide and aluminum wire

Abstract

The invention discloses a straight-up manufacturing process for carrying out deoxidization smelting of aluminum-containing steel through cooperation of calcium carbide and an aluminum wire. The straight-up manufacturing process comprises the steps that (1) the S content in furnace molten iron is smaller than or equal to 0.010%; (2) the slag discharge quantity is controlled to be smaller than 2 kg/t steel; (3) in the tapping process, calcium carbide is adopted for deoxidization, it is ensured that calcium carbide is added within the range that tapping is started for 30 s, calcium carbide is added with the weight percent that 0.010% of oxygen is included in 40 kg of calcium carbide balance molten iron, that is, the adding quantity of calcium carbide is equal to the end-point oxygen content*0.4, and the tapping slag sequence is tapping starting, calcium carbide, steel ladle lime adding within 30 s of tapping, alloy adding after tapping to 1/3 and tapping finishing; (4) furnace rear deoxidization is carried out, wherein tapping is finished, molten iron is started to an argon blowing station, oxygen fixing is firstly carried out, molten iron oxygen is controlled to range from 30 ppm to50 ppm, the aluminum wire of 100-200 m is fed according to the molten iron oxygen content, the wire feed speed is 180 m/min, an in the wire feed process, the argon blowing flow of the steel ladle bottom is controlled to be 20 m<3>/h; (5) after the wire is fed, the aluminum content of steel ladle components is controlled to range from 0.015% to 0.030%; (6) soft blowing is carried out for 8-10 min;and (7) the temperature and components are suitable for upward continuous casting pouring.

Description

technical field [0001] The invention relates to a direct-up manufacturing process for smelting aluminum-containing steel with calcium carbide and aluminum wire deoxidation. Background technique [0002] The deoxidation system in the smelting process is the key process for producing high-quality steel. As the most common active deoxidizer in the steelmaking process, aluminum is widely used in major steelmaking plants. Especially in the production of aluminum-containing steel, aluminum is used not only as a deoxidizer, but also as one of the alloying elements in molten steel, resulting in the consumption of aluminum per ton of steel in the production process of aluminum-containing steel as high as about 2kg, which increases production costs and reduces The economic benefits of steel manufacturers. With the fluctuation of the steel market, reducing production costs has become the main way for various steel companies to increase their profits. Reducing the consumption of alumin...

AI Technical Summary

Problems solved by technology

[0005] The technology involved in the invention is simple in conception, easy to implement, and has obvious effects. It can reduce the aluminum consumption per ton of aluminum-containing steel by about 1.2kg / t, and solve the outstanding problem of high consumption of aluminum and iron in the production of aluminum-containing steel.