RH (relative humidity) treatment method for low silicon-aluminum killed steel

Abstract

The invention relates to the technical field of continuous casting refining treatment, and in particular relates to an RH (relative humidity) treatment method for low silicon-aluminum killed steel. The method is characterized in that the method is suitable for <C> greater than or equal to 0.010% and less than or equal to 0.05%, <Si> greater than or equal to 0.03% and less than or equal to 0.05%, and argon-blown silicon less than or equal to 0.008% after discharge of steel from a converter, SiO2 oxidized by low carbon ferrosilicon and Al2O3 in molten steel are reacted through rimmed steel by RH so as to produce deoxidized product aluminum silicate, and fine Al2O3 inclusion adhere to the aluminum silicate in floating upward process, so that the purpose of purifying the molten steel is achieved. Compared with the prior art, the method has the beneficial effects of meeting the requirement of upper limit of 0.03% of the end product silicon of low silicon-aluminum killed steel, reducing the phenomenon of flocculation caused by producing RH low silicon-aluminum killed steel through a middle sheet billet chamber machine, and lowering the inclusion rate of a steel board, and the cold rolling inclusion rate of defect is lowered to 0.26% from 0.46%.

Description

technical field [0001] The invention relates to the technical field of continuous casting refining treatment, in particular to an RH treatment method for low-silicon-aluminum killed steel. Background technique [0002] At present, the silicon upper limit of finished low-silicon aluminum-killed steel is 0.03%. Low-carbon ferrosilicon is not added in the RH treatment process. The molten steel is killed by adding aluminum. After RH treatment, the Al in molten steel 2 o 3 The inclusions are not easy to float up. When casting on the medium-thin slab continuous casting machine, floc flow is easy to occur, which increases the inclusion rate of the steel plate and affects the quality of the steel plate. Contents of the invention [0003] The purpose of the present invention is to provide a RH treatment method for low-silicon-aluminum-killed steel, which can alleviate the flocculation phenomenon that occurs when the low-silicon-aluminum-killed steel is produced by a medium-thin sl...

AI Technical Summary

Problems solved by technology

[0002] At present, the silicon upper limit of finished low-silicon aluminum-killed steel is 0.03%. Low-carbon ferrosilicon is not added in the RH treatment process. The molten steel is killed by adding aluminum. After RH treatment, the Al in molten steel 2 o 3 The inclusions are not easy to float up. When casting on the medium-thin slab continuous casting machine, floc flow is easy to occur, which increases the inclusion rate of the steel plate and affects the quality of the steel plate.