Technique for smelting stainless steel through RKEF (rotary kiln-electric furnace) and AOD furnace duplex process

Abstract

The invention relates to a technique for smelting stainless steel, and particularly relates to a novel technique for smelting stainless steel through an RKEF (rotary kiln-electric furnace) and AOD furnace duplex process. The technique comprises the following steps: directly feeding crude nickel alloy molten iron produced by an RKEF into an AOD furnace, performing duplex refining to produce stainless steel, and making the stainless steel into slabs through a continuous casting system. The invention has the following beneficial effects: intermediate production procedures, such as crude nickel alloy casting, intermediate frequency furnace remelting and the like, are reduced; the heat energy of the crude nickel alloy molten iron is fully utilized; the slag type, slag temperature and molten iron temperature in the crude nickel alloy production are controlled, so that the temperature can reach a certain value during AOD furnace refining, and the pilot and industrial production of the stainless steel can be finished through other technologies; the technique reduces the power consumption and production cost, shortens the product yield time, ensures that the on-site environment is cleaner and more friendly and relieves the labor intensity of personnel; and refined stainless steel products meeting the national standards and customer requirements can be produced.

Description

Technical field: [0001] The invention belongs to the technical field of metallurgical engineering, and in particular relates to a new process method for smelting stainless steel by adopting RKEF and AOD furnace duplex method. Background technique: [0002] At present, the method of producing stainless steel at home and abroad is basically to use the crude nickel alloy block produced by the submerged thermal electric furnace as the main raw material, melt it in the intermediate frequency furnace, mix it with other raw materials in a certain proportion through the AOD refining furnace, and decarburize and dephosphorize. After the waiting process, oxidation and final refining are carried out to complete the adjustment of liquid alloy composition and temperature, and finally become stainless steel. The qualified stainless steel after refining is made into stainless steel slabs by continuous casting system. [0003] Due to the use of thick nickel alloy block as the main raw mater...

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Problems solved by technology

[0004] However, the use of RKEF process to produce crude nickel alloy through the control of slag type, slag temperature, molten iron temperature and heat preservation control and other measures, directly sending molten iron into AOD furnace for double refining and other production technology of stainless steel has not been reported, and belongs to domestic and foreign blank

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