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A method of blowing argon at the bottom of molten steel quickly and uniformly

A bottom-blown argon and uniform technology, applied in the field of refining outside the metallurgical furnace, can solve the problems of high smelting cost, long blowing time, and large gas consumption, and achieve the effects of improving smelting efficiency, shortening mixing time, and reducing volume

Active Publication Date: 2017-06-09
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The problem is that the blowing time is long and the gas consumption is large, which leads to high smelting costs, which have certain restrictions on the production of high-tempo high-quality steel at this stage

Method used

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  • A method of blowing argon at the bottom of molten steel quickly and uniformly

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Embodiment example

[0012] In the water simulation optimization study on the 120t steel ladle used for refining, the ladle bottom device such as figure 1 The breathable brick shown. Use T2-T4 combination to carry out one strong and one weak blowing, the angle between the two is 135°, located at 0.64R, T2 uses weak blowing 100L / min, T4 uses strong blowing 500-700L / min, under the same total flow rate The measured mixing time is about 40% shorter than that of the T1-T3 combination with the shortest mixing time in the same flow rate of the double holes. The included angle of the T1-T3 combination is 180°, which is located at 0.7R.

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Abstract

The invention relates to a bottom argon blowing method capable of quickly homogenizing molten steel, and belongs to the technical field of external refining. The bottom argon blowing method is characterized in that a double-hole strong-blowing and weak-blowing bottom argon blowing mode is adopted; after an alloy is added to a steel ladle, argon blowing is carried out at the bottom of the steel ladle, one hole is subjected to weak blowing, and the other hole is subjected to strong blowing; a weak blowing flow rate is 100-150L / min; a strong blowing flow rate is 500-700L / min; the two argon blowing holes are positioned at places which are 0.64-0.7R away from the center of the bottom surface of the steel ladle; R is the inner diameter of the bottom surface of the steel ladle; and an included angle between the two argon blowing holes is 120-180 degrees. Compared with the traditional double-hole identical flow rate blowing mode, a strong molten steel circulation flow and a weak molten steel circulation flow that are formed by the strong-blowing and weak-blowing mode can homogenize the temperature and components of the molten steel more quickly; the size of a dead zone in the steel ladle is reduced; the cost of a refining workshop is reduced; and the refining efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of refining outside the metallurgical furnace, and is particularly suitable for a method for quickly uniforming the temperature and composition in a ladle. Background technique [0002] At present, in the production of high-quality steel, strict requirements are put forward on the cleanliness of molten steel. In order to improve the cleanliness of molten steel as much as possible, the most important method at this stage is to add alloys or wires to the ladle, and use alloys and molten steel to The reaction of the components in the medium generates deoxygenated products or denatures the deoxygenated products. This process requires argon blowing and stirring from the bottom of the ladle. On the one hand, it can speed up the reaction speed and quickly uniform the temperature and composition of molten steel. In addition, it can promote the floating of inclusions and improve the cleanliness of molten steel. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/072
Inventor 郭晓晨唐海燕李京社张江山
Owner UNIV OF SCI & TECH BEIJING
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