Desulfurizing method of ladle refining furnace and desulfurizing method used for slab-grade steel

A ladle refining furnace and steel type technology, applied in the field of desulfurization of slab steel type and ladle refining furnace, can solve the problems of increased production cost, increased production time, increased process or process difficulty, etc., and achieve high desulfurization efficiency Effect

Inactive Publication Date: 2011-05-11
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many related technologies for deep desulfurization of molten steel. However, most of these technologies need to increase the process or process difficulty, which leads to the increase of production cost or the increase of production time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In this embodiment, the sulfur content of molten steel entering the ladle is 0.036%. Add 10kg / t to the molten steel in the ladle refining furnace 钢 Lime, then add 1.0kg / t to molten steel 钢 Then, blow argon gas at the bottom to carry out strong stirring, and the flow rate of argon gas is 500NL / min; refining for 15min. 3 minutes before the end of refining, reduce the flow rate of bottom blowing argon to 200NL / min, and softly blow argon for 5 minutes after refining and alloying. After being treated by the detachment method of this embodiment, the sulfur content in molten steel is 0.023%. The desulfurization rate of the desulfurization method according to this embodiment is 36.1%.

Embodiment 2

[0021] In this embodiment, the sulfur content of molten steel entering the ladle is 0.025%. Add 3kg / t to the molten steel in the ladle refining furnace 钢 The high basicity top slag (its composition is shown in Table 1), then add 0.5kg / t to molten steel 钢 Then, blow argon gas at the bottom to carry out strong stirring, and the flow rate of argon gas is 450NL / min; refining for 10min. 3 minutes before the end of refining, reduce the flow rate of bottom blowing argon to 180NL / min, and soft blow argon for 7 minutes after refining and alloying. After being treated by the detachment method of this embodiment, the sulfur content in molten steel is 0.015%. The desulfurization rate of the desulfurization method according to this embodiment is 40.0%.

[0022] Table 1 Chemical composition of high alkalinity refining slag (unit: %)

[0023] Element

Embodiment 3

[0025] In this embodiment, the sulfur content of molten steel entering the ladle is 0.015%. Add 1.8kg / t to the molten steel in the ladle refining furnace 钢 high alkalinity top slag, then add 0.6kg / t to molten steel 钢 aluminum particles, and then, when the slag is completed, add 1.2kg / t again to the molten steel 钢 Lime and 3kg / t 钢 of fluorite. During the process of slagging, argon gas is blown from the bottom to carry out strong stirring at the same time, and the flow rate of argon gas is 550NL / min; refining takes 12 minutes. 3 minutes before the end of refining, reduce the flow rate of bottom blowing argon to 150NL / min, and soft blow argon for 7 minutes after refining and alloying. After being treated by the detachment method of this embodiment, the sulfur content in molten steel is 0.010%. The desulfurization rate of the desulfurization method according to this embodiment is 33.3%.

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PUM

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Abstract

The invention provides a desulfurizing method of a ladle refining furnace and a desulfurizing method used for slab-grade steel, wherein the desulfurizing method of a ladle refining furnace comprises the steps of adding 3 to 10 kg/t lime or high-alkalinity top slag of steel into the molten steel in the ladle refining furnace, adding 0.5 to 1.0 kg/t aluminum of steel into the molten steel, and blowing argon gas from the bottom to carry out forced agitation with the flow of the argon gas not lower than 450 NL/min; and at the time of three minutes before the refining ends, reducing the flow of the argon gas blown at the bottom to the flow not higher than 200NL/min, and softly blowing the argon gas for more than 5 minutes after the refining and the alloying end. The desulfurizing method used for the slab-grade steel comprises the steps of adding 5.0 to 12.0 kg/t mixed slag of steel into the ladle at the tapping of the converter, and after tapping, adding a slag regulating agent of steel, which is not higher than 20 kg/t into the slag surface of the molten steel; and then carrying out the desulfurizing method of the ladle refining furnace. The method based on the refining technology of the ladle refining furnace or the steel-making technology with the combination of the converter smelting and the refining of the ladle refining furnace of the invention realizes the desulfurization of the molten steel and has high desulfurizing efficiency.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, more specifically, to a desulfurization method for a ladle refining furnace and a desulfurization method for slab steel types. Background technique [0002] Generally, sulfur element is a harmful element in steel, it is easy to generate FeS with low melting point, causing hot brittle cracks in steel during hot rolling and welding; and sulfur is also easy to form sulfide inclusions in steel, reducing the ductility and Toughness, especially impact toughness. When the sulfur in the steel is high, the corrosion resistance to hydrogen-induced cracking (HIC) is greatly reduced. In order to improve the ductility and toughness of the slab steel, it is necessary to further reduce the sulfur content in the slab steel, which requires improvements to the prior art. At present, there are many related technologies for deep desulfurization of molten steel. However, most of these technologies...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C21C7/072C21C7/076
CPCY02P10/20
Inventor 雷辉陈靓吴胜喻林黄登华杨洪波
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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