Premelted refining slag for refining low-oxygen steel by converter

Abstract

The invention discloses a premelted refining slag for refining low-oxygen steel by a converter, belonging to the technical field of metallurgy and steelmaking. The invention is characterized in that the premelted refining slag comprises the following chemical compositions in percentage by weight: 53.0-58.0% of CaO, 28.0-32.0% of Al2O3, 3.0-8.0% of MgO, less than or equal to 6.0% of SiO2, less than or equal to 5.0% of CaF2, less than or equal to 0.3% of TiO2, less than or equal to 0.05% of B, less than or equal to 0.03% of P and less than or equal to 0.2% of S. According to the aim and the function of the CaO-Al2O3 slag system, the invention designs premelted refining slag chemical composition proportioning; the premelted refining slag can be used for quickly forming refining slag with favourable mobility and reducibility as well as high alkalinity in the LF refining process so as to cause LF to adapt to the technical characteristics of the converter, thus efficiently finishing desulfuration and deoxidation, removing impurities and refining; the invention satisfies the production requirements of low-oxygen high-quality converter steel and realizes the aim of low-oxygen steel.

Description

technical field [0001] The invention relates to a refining slag for converter steelmaking and a preparation method thereof, in particular to a premelted refining slag for converting low-oxygen steel, and belongs to the technical field of metallurgy and steelmaking. Background technique [0002] The process of producing high-quality carbon steel and special steel by converter has been continuously developed in recent years. Since the LF refining furnace has the functions of arc heating, high thermal efficiency, strong temperature adjustment capability, stirring and alloying functions, fine-tuning and precise control of components, etc., it quickly became an important part of converter steel at the beginning of the production of high-quality carbon steel in the converter. Refining supporting equipment, with the demand for vacuum refining, gradually formed a four-in-one converter clean steel production process of BOF-LF-VD(RH)-CC. Among them, the LF refining furnace is the key...

AI Technical Summary

Problems solved by technology

Compared with the eccentric bottom tapping process of the electric furnace, it is a difficult problem to keep the slag out of the converter steelmaking process. During the tapping process, a certain amount of highly oxidative final slag will inevitably enter the ladle, which will affect the subsequent LF refining rhythm and deoxidation. , De-inclusion refining increases the difficulty

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