Method for improving purity of molten steel in argon station

A technology of purity and molten steel, applied in the field of converter smelting, can solve the problems of prolonging the production cycle, increasing the cost per ton of steel, waste and so on

Active Publication Date: 2011-05-04
NANYANG HANYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for relatively low-grade steel types, it is undoubtedly a waste to refine them thro...

Method used

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  • Method for improving purity of molten steel in argon station
  • Method for improving purity of molten steel in argon station

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Embodiment Construction

[0013] The steps that the present invention takes are as follows:

[0014] (1) Add 30-60Kg of lime, 20-40Kg of calcium carbide, and 130-160Kg of pre-melted refining slag into the ladle before blowing argon. The total diameter of the molten steel open hole shall be controlled within 400-600mm;

[0015] (2) Add aluminum wire into the ladle after blowing argon for 1 to 3 minutes;

[0016] (3) After accumulatively blowing argon for 6 minutes, reduce the amount of argon to carry out soft argon blowing. The soft argon blowing standard is based on the total diameter of the molten steel open hole being controlled at 200-400 mm, and the soft argon blowing time must be guaranteed to be ≥ 6 minutes;

[0017] (4) The total argon blowing time of the molten steel in the argon station is ≥12 minutes. When the temperature meets the liquidus temperature +50-60°C, the argon gas is turned off, and then the alkaline covering agent and carbonized rice husk are added to the ladle.

[0018] The pr...

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Abstract

The invention discloses a method for improving purity of molten steel in an argon station, which comprises the following steps of: (1) adding 30 to 60kg of lime, 20 to 40kg of calcium carbide and 130 to 160kg of premelted refining slag into a steel ladle before argon blowing, and increasing argon quantity for strongly blowing argon, wherein the strong argon blow standard is that the sum of the diameters of blown open holes of the molten steel is controlled to be between 400 and 600mm; (2) after strongly blowing argon for 1 to 3 minutes, adding aluminum wires into the steel ladle; (3) after strongly blowing argon for 6 minutes together, reducing argon quantity for softly blowing argon, wherein the soft argon blow standard is that the sum of the diameters of blown open holes of the molten steel is controlled to be between 200 and 400mm, and the soft argon blow time is ensured to be more than or equal to 6 minutes; and (4) making the total argon blow time for the molten steel in the argon station more than or equal to 12 minutes, closing the argon when the temperature accords with the liquidus temperature of between 50 and 65 DEG C, and adding an alkaline covering agent and carbonized rice husks into the steel ladle. The premelted refining slag is added into the argon station, the process is easy to operate and the purity of the molten steel can be effectively improved.

Description

[0001] technical field [0002] The invention belongs to the technical field of converter smelting, and specifically relates to a method for improving the purity of molten steel in an argon station, which is used to improve the properties of slag during processing in the argon station, which is beneficial to the adsorption and removal of inclusions, and reduces the total oxygen content of finished products, P , S and other harmful impurities, especially suitable for converter smelting straight up continuous casting pouring steel. Background technique [0003] The principle of LF refining is to use the good reducing atmosphere in the furnace, add slag-forming materials and deoxidizers, and accelerate the material transfer between steel slags by blowing argon gas at the bottom of the ladle to stir, achieve the purpose of deep desulfurization and deoxygenation, and promote the floating of inclusions . However, for relatively low-grade steel grades, LF refining is undoubtedly a...

Claims

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Application Information

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IPC IPC(8): C21C7/04C21C7/076C21C7/072
CPCY02P10/20
Inventor 赵迪朱书成张立新许少普崔冠军张少辉付全虎袁恒闫波许春乔华伟李振恒
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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