Clean steel production method for reducing molten steel total oxygen content

Abstract

The invention discloses a clean steel production method for reducing the molten steel total oxygen content. In the molten steel refining process, when the molten steel deoxidation is in a completely still state, mixed powder is added into ladles with the addition of 0.5 percent to 1.0 percent of the weight of the molten steel, the bottom argon gas blowing and the stirring of the ladles are started to carry out after the mixed powder is added, the bottom argon gas blowing flow rate is between 15 and 25Nm<3> / h, and the bottom blowing time is between 5 and 15min. The mixed powder is prepared by mixing metallurgy lime with the granularity lower than 1mm, aluminum powder with the granularity between -100 meshes and +200 meshes and fluorspar powder with the granularity lower than 1mm. The ingredients have the mass percent as follows: 75 to 79 percent of CaO, 10 to 15 percent of Al, 2 to 4 percent of CaF2 and the balance unavoidable impurities. The invention can reduce the total oxygen content in the molten steel to a value lower than 15ppm, and the cleanness of the molten steel can be improved.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a clean steel production method for reducing the total oxygen content of molten steel. Background technique [0002] As the market demand for pure steel continues to increase, in order to occupy a larger market share and pursue higher profits, major steel mills at home and abroad have developed and innovated many advanced technologies for the production of pure steel while continuously expanding high value-added products. Production of products. All walks of life have higher and higher requirements on the performance and quality of steel products. Only by greatly reducing the content of impurity elements in steel can the quantity and shape of non-metallic inclusions in steel be effectively controlled. Different steel types have different requirements for purity and sensitivity to inclusions. For example, aluminum oxide cluster inclusions can cause surface defects in thin st...

AI Technical Summary

Problems solved by technology

For example, aluminum oxide cluster inclusions can cause surface defects in thin steel plates for automobiles and electrical products, cause cracks in thin plates for DI cans, and cause wire breakage such as tire radials, and deteriorate the fatigue performance of steel bars such as bearing steel

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