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

A low-silicon aluminum-killed steel and treatment method technology, applied in the field of continuous casting refining treatment, can solve problems such as easy occurrence of flocculation, increase of steel plate inclusion rate, and influence on steel plate quality, so as to reduce the flocculation phenomenon and reduce the steel plate inclusion rate. Effect

Inactive Publication Date: 2013-06-26
ANGANG STEEL CO LTD
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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 molte

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Embodiment Construction

[0013] The present invention will be further described below in conjunction with specific embodiment:

[0014] The RH treatment method of low-silicon aluminum-killed steel of the present invention is suitable for 0.010%≤[C]≤0.05%, 0.03%≤[Si]≤0.05%, silicon≤0.008% after argon blowing treatment after tapping from converter, and Boiling steel directly on RH, using SiO produced by oxidation of low-carbon ferrosilicon 2 and Al in molten steel 2 o 3 The reaction produces a deoxidized product, aluminum silicate, which adheres to fine Al during the process of flotation 2 o 3 Inclusions, to achieve the purpose of purifying molten steel, the specific operation steps are as follows:

[0015] 1) The oxygen value at the decarburization end point is controlled at 250-500ppm;

[0016] 2) Add low-carbon ferrosilicon B to the molten steel at 0.1-0.2Kg / t molten steel after oxygenation at the end of decarburization, and perform oxygenation again after circulating for 3-4 minutes;

[0017] ...

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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...

Claims

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Application Information

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IPC IPC(8): C21C7/06C21C7/10
Inventor 梅雪辉费鹏张越林洋臧绍双毛志勇简龙王鹏郭猛孙艳霞匡勃孙政军
Owner ANGANG STEEL CO LTD
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