Deoxidation method for preventing casting flocculation of medium-carbon steel

Abstract

The invention discloses a deoxidation method for preventing casting flocculation of medium-carbon steel. The deoxidation method comprises the following steps: controlling end-point C of a converter to be greater than or equal to 0.10%, only adding manganese and silicon alloys and a carburant in a steel tapping process; blowing agron gas from the rear side of the converter for 2-3 minutes after alloying, controlling oxygen in steel to be 30-60ppm; carrying out single LF refining or LF+RH duplex station processing, according to S and H requirements of steel finished products, for a refining process route: during processing at a LF refining position, adopting CaC2 to replace aluminum for deoxidation; if [H] in the steel is required to be less than or equal to 2ppm, entering RH to carry out vacuum degassing, wherein vacuum degree for vacuum treatment is smaller than 0.2kPa, and vacuum treatment time is greater than or equal to 15 minutes; for deoxidation in the vacuum treatment process, utilizing carbon in molten steel to replace aluminum to remove oxygen in molten steel; for the medium-carbon steel with carbon content of 0.25-0.60%, balancing oxygen content to be 2-3ppm through RH treatment, wherein molten steel deoxidation degree is the same as pure aluminum deoxidation degree. The deoxidation method can improve purity of molten steel, can reduce Al2O3 inclusions and can reduce deoxidation alloy consumption while preventing flocculation. Therefore, the smelting cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of steelmaking technology, and in particular relates to a low-cost deoxidation method capable of preventing pouring flocculation of medium carbon steel. Background technique [0002] At present, most medium-carbon steels (C0.25-0.60%) in converter smelting adopt carburization method to meet the requirements of tapping temperature and end point [P], and the end point carbon is basically controlled below 0.10%. In order to ensure the stable control of the carbon content of the converter and the effect of steel slag modification, the process of manganese, silicon and aluminum compound deoxidation in the tapping process of the converter is adopted. After tapping, a modifier of 2kg / ton of steel is added, and the argon station blows argon for 3 minutes before hoisting to The refining position performs refining treatment. If the sulfur content of the finished medium carbon steel is less than 0.010%, it needs to be...

AI Technical Summary

Problems solved by technology

[0004] 2) In the continuous casting pouring process, the phenomenon of flocculation changing the submerged nozzle and flocculation dropping rods often occurs

Therefore, in order to improve the flocculation phenomenon, it is necessary to feed silicon-calcium wire in refining, which not only increases the cost per ton of steel, but also slightly improves the flocculation situation during the molten steel pouring process, and has not been fundamentally solved.

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