Boron-containing weather-proof thin strip steel and manufacturing method thereof

Abstract

Provided are boron-containing weather-proof thin strip steel and a manufacturing method thereof. The manufacturing method comprises performing double roller thin strip continuous casting to produce boron-containing weather-proof steel; after a cast strip is processed through a crystallizing roller, adopting a mode of spraying dry ice to perform uniform strengthened cooling on the cast strip, rapidly cooling the cast strip to below 1,280 DEG C, and enabling the cooling speed to be 200-300 DEG C / s, so that precipitation of thick and large BN in the cooling mode is promoted, emergency of low-melting-point-phase B203 and precipitation of tiny AlN are avoided, and the aims of homogenizing austenite grains and reducing yield ratio are achieved; then performing austenite on-line recrystallization rolling; then performing anti-oxidizing rapid cooling to cool the strip steel undergoing hot rolling, and enabling the cooling temperature to be 80-200 DEG C / s; and enabling coiling temperature to be 500-600 DEG C. Steel with low yield ratio can be obtained through the manufacturing method, and the problems that steel produced by thin strip continuous casting are universally uneven in structure, high in yield ratio and difficult to form and cannot meet the requirements for cold rolling materials are effectively solved.

Description

technical field [0001] The invention relates to a twin-roll thin strip continuous casting process, in particular to a boron-containing weather-resistant thin strip steel and a manufacturing method thereof. Background technique [0002] Traditional thin strips are mostly produced by multi-pass continuous rolling of cast slabs with a thickness of 70-200mm, while cast strips produced by twin-roll thin strip continuous casting process are rolled into hot strips in one or two passes. The rolled strip can be put into the market. Compared with the traditional strip production process, the former has a shorter production line and requires less energy. It is a low-carbon and environmentally friendly hot-rolled thin strip production process. [0003] The typical technological process of twin-roll thin strip continuous casting is: molten steel in the ladle is poured directly into a crystallization roller and side sealing device that rotates relatively and can be cooled rapidly through...

AI Technical Summary

Problems solved by technology

Thin strip continuous casting can solve the problems of uneven structure, high yield ratio and poor formability when producing this kind of steel, so as to meet the use requirements of cold-rolled base material and "replacing cold with heat" products

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