Ladle furnace (LF) refining technology

A process, converter blowing technology, applied in the field of LF furnace refining process, to achieve the effect of reducing consumption, saving costs, and less chemical input

Active Publication Date: 2018-06-12
TIANJIN RONGCHENG UNITED IRON & STEEL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a LF furnace refining process, by optimizing the argon blowing gas supply throughout the LF furnace, dynamically controlling the flow of argon gas in stages and adjusting slag in batches, to solve the problem of difficult deep desulfurization At the same time, it can effectively control the problem of carbon increase, which has the advantages of not only completing deep desulfurization but also effectively controlling carbon increase

Method used

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  • Ladle furnace (LF) refining technology

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Embodiment 1: as figure 1 As shown, a LF furnace refining process includes the following steps: the initial carbon and sulfur content of molten steel entering the LF furnace is C: 0.04%, S: 0.009%;

[0030] Step 1: Put the molten steel qualified by converter blowing into the LF furnace, the temperature of the molten steel is controlled at 1520°C, the composition of the molten steel is C0.37-0.42%, Si0.10-0.17%, Mn0.5-0.6%, P≤0.025 %, T[O]≤30ppm, argon gas is blown at the bottom of the LF furnace when tapping, the flow rate of argon gas is 100L / min, and the pressure of argon gas is 0.3MPa;

[0031] Step 2, power transmission and heating, the current is 25000A, the heating slagging time is 10min, the argon flow rate is 250L / min, the argon pressure is 0.3MPa during the slagging process, temperature measurement and sampling;

[0032] Step 3, adjust the current to 30000A, add lime in 2-3 batches, the amount of lime added is 500kg, adjust the argon flow rate to 50L / min, argo...

Embodiment 2

[0037] Embodiment 2: A LF furnace refining process, comprising the following steps: the initial carbon and sulfur content of molten steel entering the LF furnace is C: 0.041%, S: 0.0095%;

[0038] Step 1: Put the molten steel qualified by converter blowing into the LF furnace, the temperature of the molten steel is controlled at 1530°C, the composition of the molten steel is C0.37-0.42%, Si0.10-0.17%, Mn0.5-0.6%, P≤0.025 %, T[O]≤30ppm, argon gas is blown at the bottom of the LF furnace when tapping, the flow rate of argon gas is 125L / min, and the pressure of argon gas is 0.35MPa;

[0039] Step 2, power transmission and heating, the current is 25000A, the heating slagging time is 10min, the argon flow rate is 250L / min, the argon pressure is 0.3MPa during the slagging process, temperature measurement and sampling;

[0040] Step 3, adjust the current to 30000A, add lime in 2-3 batches, the amount of lime added is 500kg, adjust the argon flow rate to 50L / min, argon pressure to 0.3MP...

Embodiment 3

[0045] Embodiment 3: a LF furnace refining process, comprising the following steps: the initial carbon and sulfur content of molten steel entering the LF furnace is C: 0.04%, S: 0.0088%;

[0046] Step 1: Put the molten steel qualified by converter blowing into the LF furnace, the temperature of the molten steel is controlled at 1540°C, the composition of the molten steel is C0.37-0.42%, Si0.10-0.17%, Mn0.5-0.6%, P≤0.025 %, T[O]≤30ppm, argon gas is blown at the bottom of the LF furnace when tapping, the flow rate of argon gas is 150L / min, and the pressure of argon gas is 0.4MPa;

[0047] Step 2, power transmission and heating, the current is 25000A, the heating slagging time is 10min, the argon flow rate is 250L / min, the argon pressure is 0.3MPa during the slagging process, temperature measurement and sampling;

[0048] Step 3, adjust the current to 30000A, add lime in 2-3 batches, the amount of lime added is 500kg, adjust the argon flow rate to 50L / min, argon pressure to 0.3MP...

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Abstract

The invention discloses a ladle furnace (LF) refining technology, and relates to the technical field of iron and steel smelting. The problem that recarburization cannot be effectively controlled easily while deep desulfurization is conducted is solved. According to the LF refining technology, the argon flow is dynamically controlled by stages in times of heating and adding of lime and calcium carbide, and thus sufficient argon blowing stirring power can be obtained to guaranteed the desulfuration effect; and meanwhile, the phenomena that fierce turning of steel and slag is caused due to excessively-large argon flow in the heating process, the steel and slag can make contact with a graphite electrode to be reacted, and direct or indirect recarburization can happen are avoided, deep desulfurization is completed and recarburization is effectively controlled. By adoption of the LF refining technology, molten steel deep desulfurization tasks are completed only with several kinds of conventional materials like the lime, the calcium carbide and iron and calcium wires, the input quantity of drugs is small, and cost is reduced.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, more specifically, it relates to a LF furnace refining process. Background technique [0002] With the increasing requirements of users for steel quality, ladle refining furnace (Ladle Furnace referred to as LF furnace) has developed rapidly as a means of improving the cleanliness of molten steel and improving steel quality, and has now become an indispensable process in the short process of modern steel production. In addition to adopting more mature secondary refining technologies such as submerged arc heating in reducing atmosphere, vacuum degassing, argon blowing and stirring with breathable bricks, LF refining furnace also introduces synthetic slag refining technology to achieve desulfurization and deoxidation through reasonable slagging process Even for the purpose of denitrification, so as to effectively absorb the inclusions in the steel and control the shape of the inclus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C21C7/06
CPCC21C7/0075C21C7/06C21C7/064Y02P10/20
Inventor 利强张丽君
Owner TIANJIN RONGCHENG UNITED IRON & STEEL GRP CO LTD
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