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Method for producing ultra-low-carbon steel by duplex process

A technology of ultra-low carbon steel and vacuum treatment, which is applied in the field of refining outside the furnace of iron and steel metallurgy. It can solve the problems that the production of continuous casting machines cannot meet the requirements, the casting flow cannot be carried out normally, and the nozzle is blocked, so as to eliminate the high incidence of inclusion defects. , Improve the production capacity of continuous casting and eliminate the effect of clogging problem

Inactive Publication Date: 2009-06-24
ANGANG STEEL CO LTD
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Problems solved by technology

This method can meet the requirements for the production of conventional continuous casting machines or the production of slabs with low internal quality requirements, but it cannot meet the requirements for the production of special models of continuous casting machines with high internal quality requirements and medium thickness.
Because of the large amount of Al 2 o 3 During the casting process, it is enriched on the inner wall of the nozzle, causing the nozzle to be blocked, and the casting flow cannot be carried out normally; while the Al that enters the slab with the casting flow 2 o 3 , which are exposed as inclusion defects in the subsequent rolling process

Method used

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Embodiment Construction

[0015] The embodiment of the present invention takes the production of 3 cans of ultra-low carbon steel as an example, and the amounts of molten steel are 101t, 99t and 102t respectively. After the converter is tapped, 400kg, 500kg and 500kg of aluminum powder and calcium oxide compounds are added respectively to initially change the composition of the compound in the top slag. When the molten steel reaches the RH treatment position, the molten steel top slag is sampled and analyzed. In the slag (FeO+ MnO) contents were 25.8%, 30.21% and 28.41% respectively; after deoxidation and alloying after RH treatment, the molten steel was transported to the LF furnace, and 300kg, 350kg and 380kg of lime, 50kg, 65kg and 75kg of aluminum were added to the top slag respectively and argon Gas stirring, the purpose of argon stirring is to increase the reaction interface of the slag-steel molten pool, make aluminum react with (FeO) and (MnO) in the slag, and remove oxygen in the slag. Formati...

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Abstract

The invention provides a method for producing ultra-low carbon steel using a duplex process, comprising converter smelting, RH vacuum processing and slab continuous casting. The method is characterized in that when the converter tapping is finished, the initial quality transforming treatment is carried out on top slag, LF secondary refining is added after the RH vacuum processing, and the final quality transforming treatment is carried out on the top slag; a slab caster with medium thickness is adopted for the continuous casting. With reasonable technical design, the method for producing ultra-low carbon steel using the duplex process can eliminate the problems of the nozzle clogging caused by aluminium oxide and high inclusion defect incidence during the production of the caster with medium thickness, realize the continuous large-scale production of the ultra-low carbon steel on a non-traditional conticaster, further lower the production cost and improve the continuous casting production capability for the ultra-low carbon steel.

Description

technical field [0001] The invention belongs to the technical field of out-of-furnace refining of iron and steel metallurgy, and in particular relates to a method for producing ultra-low carbon steel by a double-link method combining an RH vacuum treatment process and an LF out-of-furnace refining process. Background technique [0002] The traditional ultra-low carbon steel production method is converter smelting - RH vacuum treatment - continuous casting. This method can meet the requirements for the production of conventional continuous casting machines or the production of slabs with low internal quality requirements, but it cannot meet the requirements for the production of special models of continuous casting machines with high internal quality requirements and medium thickness. Because of the large amount of Al 2 o 3 During the casting process, it is enriched on the inner wall of the nozzle, causing the nozzle to be blocked, and the casting flow cannot be carried out...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06C21C7/10C21C5/00
Inventor 肖江山姚伟智赵爱英张洪峰刘振中张文许海亮
Owner ANGANG STEEL CO LTD
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