Preparation method of low-carbon-emission cold-rolled base material steel strip

Abstract

The invention discloses a preparation method of a low-carbon-emission cold-rolled base material steel strip, and belongs to the field of ferrous metallurgy. The preparation method is a method for producing a low-carbon and low-silicon boron-containing cold-rolled deep-drawing base strip steel coil by adopting process routes of top-bottom combined blown converter smelting, converter tapping slag washing and inclusion removal, slab continuous casting and hot continuous rolling. According to the material prepared through the method, the low-carbon and low-silicon component design is adopted, the LF refining procedure is omitted, and through deoxidation, inclusion removal and continuous casting in the converter tapping process, the recovery rate of boron is guaranteed, and the performance stability of steel is improved. As the LF refining procedure is omitted, the nitrogen content in the steel is reduced, the quality of the strip steel is improved, electrode consumption does not exist in the production process, power consumption and carbon dioxide emission are reduced, and a novel method is provided for converter smelting and slab continuous casting of boron-containing low-carbon and low-silicon cold-rolled base material steel strips.

Description

technical field [0001] The invention relates to a method for preparing a low-carbon emission cold-rolled base material steel strip. The process route is smelting in a converter with top-bottom combined blowing, washing the steel slag out of the converter to remove impurities, continuous casting of slabs and continuous hot rolling to produce a low-carbon, low-carbon steel strip. The invention discloses a method for deep-drawing a base strip steel coil by cold-rolling silicon-containing boron, and belongs to the field of iron and steel metallurgy. [0002] technical background [0003] Steel base strip for cold rolling, the production method of steelmaking, usually pretreatment desulfurization of molten iron, converter smelting, LF refining or RH vacuum treatment, slab continuous casting to prepare slabs that meet the specifications, and then produce slabs that meet the requirements of cold rolling through hot continuous rolling. Steel coil (base strip) for rolling needs. [0...

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Problems solved by technology

[0005] Literature search shows that the smelting method of boron-containing steel in the iron and steel metallurgy industry must go through LF treatment, and some need to go through VD or RH vacuum treatment and then add ferroboron for alloying to improve the yield of boron. Anshan Iron and Steel uses titanium in steel Nitrogen fixation method to solve the problem of hardening steel coils due to high nitrogen content

[0006] For cold-rolled base steel with low carbon, low silicon, and low manganese content, due to the extremely low content of silicon and manganese, silicon-manganese deoxidation is weakened, and only aluminum deoxidation can be used. 2 o 3 Al 2 o 3 Composite inclusions of mainly calcium and magnesium oxides are the main factors affecting product quality, and even affect the straight line of slab continuous casting. It is very easy to oxidize, and needs LF refining to produce reducing slag to produce, but the LF refining process causes molten steel to increase nitrogen and affects the mechanical properties and cold stamping performance of cold-rolled base materials

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