Low-carbon steel and manufacturing method for improving performance uniformity of low-carbon steel rolled by CSP process ferrite

Abstract

The invention provides low-carbon steel and a manufacturing method for improving performance uniformity of low-carbon steel rolled by CSP process ferrite. The low-carbon steel comprises the following components: less than or equal to 0.070% of C, less than or equal to 0.050% of Si, 0.08% to 0.30% of Mn, less than or equal to 0.025% of P, less than or equal to 0.015% of S, 0.020% to 0.060% of Al, and the balance of Fe and inevitable inclusions. Compared with the prior art, through the reasonable smelting, heating, hot rolling, cooling and coiling processes, the problems that a CSP process ferrite rolling temperature process window is narrow, the material structure property of a critical region for transformation from austenite to ferrite is highly sensitive to temperature influence, and transformation from austenite to ferrite is inconsistent are solved; and the uniformity of the material performance is improved. The performance uniformity of the low-carbon steel plate in the width direction is improved by more than 50%, and the problem of edge waves in the next cold rolling galvanizing process is solved.

Description

technical field [0001] The invention relates to the technical field of production technology of thin slab continuous casting and continuous rolling steel, in particular to a low-carbon steel and a manufacturing method for improving the performance uniformity of the ferritic rolling low-carbon steel in a CSP process. Background technique [0002] Compared with the conventional process, the CSP ferritic rolling process produces low carbon steel with a carbon content of <0.07%. The yield strength is reduced by about 15-25%, the thickness of the oxide scale is reduced by 30-50%, and the load and power consumption of the rolling mill can be significantly reduced. At present, it is one of the cutting-edge technologies in the field of hot rolling in the world's steel industry. However, due to its own process characteristics, the CSP ferrite rolling temperature process window is narrow, the material microstructure and properties in the critical area of ​​austenite to ferrite tran...

AI Technical Summary

Problems solved by technology

The performance uniformity of the width direction of this low-carbon steel plate is improved by more than 50%, which solves the edge wave problem of the next cold-rolled galvanizing process

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