Argon blowing method at bottom of steel ladle for continuously casting steel

A technology for bottom blowing argon and ladle, which is applied to the field of bottom blowing argon for continuous casting ladle, can solve the problems of long processing cycle, speeding up production rhythm, insufficient soft blowing time and insufficient standing time to limit the removal effect of inclusions, etc., to improve the cleanliness. , Alleviate the impact and avoid the effect of excessive molten steel temperature drop

Inactive Publication Date: 2012-06-13
NORTHEASTERN UNIV LIAONING
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  • Abstract
  • Description
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Problems solved by technology

[0003] In order to adjust the temperature and composition of molten steel, argon blowing at the bottom of the ladle is generally used in the refining process outside the furnace at present, and the inclusions in the molten steel are removed by soft blowing in the later stage of refining; the current shortcomings are: the time of soft blowing and the subsequent Insufficient standing time limits the removal effect of inclusions, and its processing cycle is long. In actual production, refining outside the furnace has a certain restrictive effect on speeding up the production rhythm.

Method used

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  • Argon blowing method at bottom of steel ladle for continuously casting steel
  • Argon blowing method at bottom of steel ladle for continuously casting steel

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Effect test

Embodiment 1

[0014] In the steelmaking equipment, the bottom of the 150t ladle is equipped with diffused air-permeable bricks. After the ladle is refined, it enters the continuous casting station directly to start pouring. When the ladle is poured, the gas supply switch at the bottom of the ladle is turned on to blow argon at the bottom of the ladle to supply gas. located at figure 1 In 6, this position is the bottom blowing position used in refining outside the furnace, the gas supply flow rate is 200NL / min, the gas supply pressure is 0.5MPa, when the casting volume reaches 50%, the bottom blowing gas is stopped, and the sampling analysis in the early stage after casting is completed, Compared with the casting process without argon blowing, the inclusion number density of the sample is reduced by 52%, and when the whole bottom blowing of argon is carried out, the inclusion number density is reduced by 66%.

Embodiment 2

[0016] The implementation ladle is still 150t. After the ladle is refined and enters the casting station to start pouring, the air supply device is turned on at the same time. The air supply method is double spraying. figure 1 3 and 8 positions in. The gas supply flow rate is 305NL / min, the gas supply pressure is 0.4MPa, and when the gas supply is stopped by double-hole injection to 20% of the casting volume, the number density of inclusions is reduced by 29% compared with the casting process without argon blowing; the casting volume reaches 40% %When the gas supply is stopped, the number density of inclusions decreases by 41%; when the gas is supplied all the way, the number density of inclusions decreases to 63%.

Embodiment 3

[0018] The implementation ladle is 150t. After the ladle is refined, it enters the casting station and starts the air supply device at the same time as the pouring. The air supply method is three-hole injection. figure 1 In the 3, 5 and 8 positions, the gas supply flow rate is 700NL / min, the gas supply pressure is 0.2MPa, and the gas supply is stopped when the double hole is blown to 30% of the casting volume. Compared with the casting process without argon blowing, the number density of inclusions It is reduced by 27%; when the casting volume reaches 50%, the gas supply is stopped, and the number density of inclusions is reduced by 33%; when the gas is supplied throughout, the number density of inclusions is reduced to 59%.

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Abstract

The invention provides an argon blowing method at the bottom of a steel ladle for continuously casting steel, belonging to the technical field of continuous casting. The method comprises the steps of: refining out of a furnace; removing nonmetal impurity by means of soft blowing and static putting; hoisting a large cast steel ladle at a work place for continuously casting steel; and blowing the argon into a steel ladle melting pond through diffusing-type air bricks which are arranged at the bottom of the steel ladle to remove the impurity in the steel during casting the steel ladle. The method improves the cleanliness of steel liquid, and leads partially-carried impurity grains to move close to the interface of slag metal to be removed. Meanwhile, with the circulatory flow of the steel liquid, the argon blowing method prevents the temperature of the steel liquid at a static region from being excessively reduced, promotes the homogenization of the temperature of the steel liquid in thesteel ladle melting pond, and releases the influence to the flow of the middle steel ladle liquid caused by the unevenness of the injecting and flowing temperature of the steel ladle.

Description

technical field [0001] The invention belongs to the technical field of continuous casting, and is particularly suitable for an argon blowing method at the bottom of a continuous casting steel ladle. Background technique [0002] At present, the requirement for high-quality steel is to put forward strict requirements on the cleanliness of molten steel. In order to improve the cleanliness of molten steel, new technologies and methods are constantly being produced in actual production, among which argon blowing and stirring is a commonly used production process. , starting from converter tapping, through out-of-furnace refining to continuous casting tundish, argon blowing technology is generally used in all links. Although the operation methods of each link are different, the stirring effect of argon blowing on the molten steel pool is the same. It is conducive to uniform temperature and composition of molten steel, promotes the floating and removal of non-metallic inclusions, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/072
Inventor 刘承军屈天鹏王德永冯巍姜茂发
Owner NORTHEASTERN UNIV LIAONING
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