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Refined-smelting ladle furnace calcium carbide deoxidation method

A ladle refining furnace and calcium carbide technology, which is applied in the field of iron and steel metallurgy, can solve problems such as affecting casting conditions, inclusions and polluting molten steel, and increasing production costs, and achieve the effects of improving casting conditions, improving internal quality, and saving electric energy

Inactive Publication Date: 2008-04-09
ANGANG STEEL CO LTD
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Problems solved by technology

But it significantly increases the production cost, and Al 2 o 3 The fundamental problems of inclusions polluting molten steel and affecting casting conditions have not been resolved

Method used

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with a specific embodiment in which the tank capacity is a 100-ton molten steel tank.

[0016] For ordinary carbon structural steel, calcium carbide is used to completely replace aluminum forging, the amount added per ton of steel is 0.6kg, and the amount of calcium carbide added to a 100-ton tank is 60kg. After the molten steel arrives at the station, blow argon for 3 minutes to measure temperature and take samples, stir under a large argon flow rate of 500L / min, and then add 60kg of calcium carbide, the rest is a conventional process.

[0017] For low-silicon-aluminum-killed steels and pipeline steels that require acid-melted aluminum, the standard is to add 0.4-0.8kg of aluminum forging per ton of steel, and then add 0.6-1.2kg of calcium carbide. Because a part of aluminum forging and calcium carbide are added, it is generally adopted under the premise of meeting the deoxidation requirements. If the...

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Abstract

The invention relates to a calcium carbide oxidizing method of ladle fining furnace. The calcium carbide is completely substituted for aluminum for plain carbon steel, for low silicon aluminum killed steel and pipeline steel, according to the station of slag series, the aluminum of the weigh from 0.4 kg to 0.8 kg is added to the molten steel of per ton, milled on the flux of 500 L per minute of argon gas, then the calcium carbide of the weigh from 0.6 kg to 1.2 kg is also added to the molten steel of per ton, the calcium carbide is used for oxidizing, submerged-arcing and slagging. The method not only lessens the pollution of the lard of aluminum oxide for molten steel, forms foaming slag and benefits for ladle furnace submerged-arc slagging, but also reduces noise, shields the heat radiation of molten steel, saves the power use. At the same time, the method reduces the acid smelting aluminum, the use of calcium wire, enriching-lard, effectually prevents the phenomena of circumfluence from taking place and improves the inherent quality of the billet.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and specifically relates to a method for deoxidizing a ladle refining furnace (hereinafter referred to as LF furnace) by using calcium carbide. Background technique [0002] As we all know, aluminum is a metal with strong reducibility, so in the steel smelting process, aluminum is mostly used as a strong deoxidizer, adding pure aluminum block, aluminum forging, etc. to deoxidize in the smelting process. At present, all-aluminum deoxidation is commonly used in the production of LF furnace steel. Because the price of aluminum is relatively expensive, not only the smelting cost increases, but also the effective yield of aluminum is low. More importantly, the product of all-aluminum deoxidation is Al 2 o 3 , a large amount of oxides enter the molten steel, resulting in a large amount of Al in the molten steel 2 o 3 Inclusions pollute the molten steel and seriously affect the int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06
Inventor 刘敏姚伟智赵爱英
Owner ANGANG STEEL CO LTD
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