Method for smelting low-carbon low-silicon aluminum killed steel on CSP (Cast Steel Plate) production line

Abstract

The invention relates to a method for smelting low-carbon low-silicon aluminum killed steel on a CSP (Cast Steel Plate) production line. The method comprises the steps of desulfurizing molten iron; slagging off; converter smelting; steel tapping; deoxidizing and alloying; argon blowing in an argon feeding station; refining in an LF furnace; and normally adopting protective casting to form a blank.According to the method for smelting the low-carbon low-silicon aluminum killed steel on the CSP production line provided by the invention, the problems of high substandard rate of products, low qualification rate of components, frequency of cast steel casting break and the like caused by surface quality defects in short process production for smelting the low-carbon low-silicon aluminum killed steel at present are solved, the substandard rate of the products caused by surface inclusion defects is reduced to be within 0.4 percent, the qualification rate of the components is improved to be more than 98.5 percent, and the cast steel casting break rate is reduced to be within 0.4 percent.

Description

technical field [0001] The invention relates to the field of killed steel production, in particular to a smelting method for producing low-carbon, low-silicon, aluminum-killed steel with a short CSP process. Background technique [0002] Low-carbon and low-silicon aluminum-killed steels, such as RST330, DC01 and Q235J0, are widely used in electrical, construction, machinery and other industries. For this type of steel, the market requires that it should have good ductility and stamping resistance, which requires strict surface quality for continuous casting slabs; It is necessary to ensure that silicon is controlled at Si]≤0.04%, which poses a difficult problem for the control of steelmaking process. [0003] The Chinese Patent Publication No. CN104056871 discloses "a production process for controlling inclusions". It uses low-basicity slag system to transform high-melting-point inclusions in steel into low-melting-point silicate inclusions by controlling the process of de...

AI Technical Summary

Problems solved by technology

Through the control of Als and S in the process of steel deoxidation, slag and LF furnace refining, it solves the problems of high correction rate of surface inclusion defects, low component qualification rate and broken pouring of low-carbon and low-silicon aluminum-killed steel in the existing CSP production line Frequent and other problems make the rate of judgment change as low as less than 0.4%, the qualified rate of components increases to more than 98.5%, and the rate of broken pouring of pouring steel is as low as less than 0.4%.