Refined-smelting ladle furnace calcium carbide deoxidation method

Abstract

The invention relates to a calcium carbide deoxidation method for a ladle refining furnace, which completely replaces aluminum forging with calcium carbide for ordinary carbon steel. For low-silicon aluminum-killed steel and pipeline steel, according to the slag system, add 0.4-0.8kg of aluminum forging per ton of steel, stir at an argon flow rate of 500L / min, and then add calcium carbide in an amount of 0.6-1.2kg per ton of steel , Carbide carbide deoxidation submerged arc slagging. By adopting the present invention, the deoxidation cost of ordinary carbon steel can be reduced by about 3300 yuan per ton of steel; the cost of low-silicon-aluminum killed steel can be reduced by 5500 yuan per ton of steel. It not only reduces the pollution of Al2O3 inclusions to molten steel and forms foamy slag, which is beneficial to LF furnace submerged arc slagging; it can also reduce noise and shield thermal radiation of molten steel, save electric energy and reduce electrode consumption. At the same time, it can reduce the acid-melted aluminum in the steel, reduce the consumption of calcium wire; reduce the enrichment of inclusions, effectively prevent the occurrence of flocculation, and improve the internal 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...

AI Technical Summary

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