METHODE FOR PRODUCING WIDE FLAT STEEL BY THIN SLAB CONTINUOUS CASTING AND ROLLING AND THE SYSTEM THEREOF

摘要

Disclosed are a method for producing wide flat steel by thin slab continuous casting and rolling and the system thereof. The method includes the following steps: the molten steel is first continuously cast into a thin slab of 50~90mm thickness; then the thin slab is carried out even heating, electromagnetic induction heating, surface descaling, hot strip rolling, laminar flow cooling and coiling. Through regulating the technological parameters of the method, the solid solution and precipitation behaviors of carbon, nitrogen and sulfide in steel are controlled, and finally, qualified wide flat steel can be obtained. The system mainly consist of a slab continuous caster, a slab shearing equipment, a roller-hearth furnace, a slab electromagnetic induction heating stove, a high-pressure water descaling device, a hot strip mill, a laminar flow cooling device and a steel strip coiling apparatus which are successively connected. The slab electromagnetic induction heating stove is comprised of a quick electromagnetic induction zone and an electromagnetic induction holding zone. The method and the system can effectively control the solid solution and precipitation behaviors of carbon, nitrogen and sulfide in steel, and produce high quality of broad hot strips with lower cost and by more flexible process.