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Method for accurately controlling aluminum consumption of IF steel

A technology of precise control and molten steel, applied in the field of smelting, can solve the problems of large fluctuations in IF steel and aluminum consumption and poor stability, and achieve good economic benefits, low cost, and reduced fluctuations

Inactive Publication Date: 2020-07-28
PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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Problems solved by technology

[0005] In view of this, the object of the present invention is to provide a method for accurately controlling the amount of aluminum in IF steel, which can effectively solve the problems of large fluctuations in aluminum consumption and poor stability in IF steel

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  • Method for accurately controlling aluminum consumption of IF steel

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Embodiment 1

[0039] A production process of high-grade automobile panel steel. The molten steel is produced through a converter-LF furnace-RH furnace-continuous casting process, and the steel output of the converter is 230 tons. During RH refining, the inbound oxygen activity is 500ppm, the inbound carbon content is 240ppm, and the steel grade Mn requirement is 0.10%. With this invention, the amount of high-carbon ferromanganese is 77kg, metal manganese is 154kg, and the time for adding high-carbon ferromanganese and metal manganese is 3 minutes, that is, adding high-carbon ferromanganese and metal manganese within 3 minutes of RH refining. At the end of RH decarburization, the oxygen activity was 248ppm, the aluminum consumption was 186kg, the RH outbound aluminum content was 0.039%, and the Mn content was 0.10%. After adopting the invention, the fluctuation of aluminum consumption between furnaces can be controlled within 10kg, and the fluctuation of Als can be controlled within 0.005%. ...

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Abstract

The invention discloses a method for accurately controlling the aluminum consumption of IF steel. The method comprises the following steps of tapping steel by a converter without deoxidation alloying;in the RH refining process, adding high-carbon ferromanganese for deoxidation, wherein the amount of the added high-carbon ferromanganese is determined on the basis of the carbon content of molten steel, and complementing the manganese content requirement of the steel grade through metal manganese; adding aluminum for deoxidization after the decarburization is finished. According to the method for accurately controlling the aluminum consumption of the IF steel, the amount of the added high-carbon ferromanganese for deoxidation is determined according to the carbon content of the molten steel,accurate control over oxygen inhibition in molten steel decarburization can be achieved, then the aluminum consumption of the IF steel can be accurately controlled, fluctuation of the aluminum consumption is reduced, and the inclusion control level is stabilized.

Description

technical field [0001] The invention relates to the technical field of smelting, in particular to a method for precisely controlling the amount of aluminum used in IF steel. Background technique [0002] Interstitial atom-free steel is also called IF steel. In IF steel, due to the low content of C and N, adding a certain amount of Ti and Nb makes the C and N atoms in the steel fixed into carbides and nitrides, so that the steel There are no interstitial atoms, so it is called interstitial-free steel. Interstitial-free steel has low yield point and yield strength ratio, high elongation, high plastic strain ratio, high work hardening index and other deep drawing properties, and has no aging. [0003] For iron and steel enterprises that produce high-surface-quality cold-rolled IF steel products such as automobile sheets and home appliance sheets, users have higher requirements for the surface quality of IF steel, and the degradation rate of surface inclusion defects in surface...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/10C21C7/06C21C7/068C21C7/00
CPCC21C7/10C21C7/06C21C7/0006C21C7/068
Inventor 张彦恒周海龙喻林
Owner PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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