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Method for smelting stainless steel by direct reduced iron

A technology for reducing iron and stainless steel, applied in electric furnaces, furnace types, furnaces, etc., can solve problems such as affecting the quality of final products, inability to remove heavy metals, and less environmental pollution, reducing chromium oxidation, less resource consumption, and less environmental pollution. Effect

Active Publication Date: 2012-11-21
BEIJING SHOUGANG INT ENG TECH
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Problems solved by technology

[0005] The object of the present invention is to provide a kind of method that adopts direct reduction iron to smelt stainless steel, overcomes the deficiency that heavy metals such as As, Cu, Pb, Sn contained in scrap steel of the above-mentioned prior art cannot be removed, affects the quality of final product; And, equipment investment is few, Less resource consumption and less environmental pollution

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  • Method for smelting stainless steel by direct reduced iron

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Embodiment Construction

[0016] 1) The direct reduced iron is melted in an eccentric bottom electric arc furnace 1. The main components of the direct reduced iron are: C 1.4%; S 0.01%; P 0.04%; total iron content 92%; metallic iron content 84.64%; FeO 9.47%; The steel is tapped after oxygen smelting, the tapping temperature is 1580°C, and the P content is 0.02%.

[0017] 2) Put the molten steel in step 1 into the AOD furnace 3 through the ladle 2, blow oxygen to decarburize and raise the temperature, and when the temperature of the molten pool rises to 1660°C, continuously put the high-carbon ferrochromium into the AOD furnace at a speed of 1.8t / min Alloying in 3, while composite side blowing O 2 / N 2 The mixed gas decarburizes and preserves chromium; puts ferrosilicon into the steel, and on the one hand reduces the Cr in the slag 2 o 3 , On the other hand, make up for heat loss, maintain the temperature of the molten pool, the end point temperature of molten steel is 1680 ° C, the end point carbon...

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Abstract

The invention relates to a method for smelting stainless steel by direct reduced iron, and belongs to the technical field of stainless steel smelting. The method includes the process steps: melting the direct reduced iron by an electric furnace; refining and alloying the iron by an AOD (argon oxygen decarburization) furnace; refining the iron by the AOD furnace; and continuously casting the iron.Compared with a traditional stainless steel smelting method, the method has the advantages that product quality is high, the content of oxygen, nitrogen, hydrogen and impurities in the steel is low, the P content can be controlled below 0.02%, the variety range is wide, low-carbon and ultra-low-carbon stainless steel, low-P stainless steel and ultra-pure ferrite stainless steel can be produced, and the comprehensive yield of chromium is improved by about 5% as the electric furnace is only used for melting the direct reduced iron and providing high-temperature crude molten steel.

Description

technical field [0001] The invention belongs to the technical field of stainless steel smelting, and in particular relates to a method for smelting stainless steel by using direct reduced iron; the direct reduced iron is used as the main raw material for smelting stainless steel, and after being melted in an electric furnace, the stainless steel is refined in an AOD furnace and a VOD furnace. Background technique [0002] At present, the main raw materials for smelting stainless steel at home and abroad are mostly ordinary steel scrap, stainless steel scrap and molten iron. [0003] Most of the raw materials for smelting stainless steel abroad are stainless steel scrap, and the smelting method is the two-step method of electric furnace-AOD furnace or the three-step method of electric furnace-AOD furnace-VOD furnace. Electric furnace-AOD furnace is a two-step smelting process, that is, the electric furnace is used as the main melting furnace, and scrap steel and alloy materia...

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Application Information

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IPC IPC(8): C21B13/12C21C7/00C22C33/04
Inventor 武国平张德国张国栋宋宇
Owner BEIJING SHOUGANG INT ENG TECH
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