Low-yield-ratio thin strip steel continuous casting and continuous rolling production line and production process

Abstract

The invention belongs to the technical field of steel continuous casting and continuous rolling, and particularly discloses a low-yield-ratio thin strip steel continuous casting and continuous rollingproduction line and a production process. The production line comprises a continuous casting machine, a high-pressure water rough descaling device, a rough rolling unit, a swing shear, a waste blankpushing and stacking device, an emergency shear, an induction heating furnace, a high-pressure water fine descaling device, a finishing rolling unit, a high-speed flying shear and a coiling unit whichare sequentially arranged in the rolling direction. The production process comprises the steps of continuous casting blank forming, high-pressure water rough descaling, rough rolling, induction heating, high-pressure water fine descaling, finish rolling, high-speed flying shear coil dividing and coiling. According to the low-yield-ratio thin strip steel continuous casting and continuous rolling production line and the production process, by additionally arranging rough descaling, reducing the number of induction heating sets, lengthening the distance between finish rolling middle racks and shortening the distance between a finish rolling tail rack and a recoiling machine, production of thin strip steel with high surface quality and low yield ratio is achieved; and meanwhile, due to the fact that rolling line equipment is reduced and the length of the production line is shortened, the construction and operation investment cost of the production line can be reduced.

Description

Technical field [0001] The invention relates to the technical field of steel continuous casting, in particular to a low yield ratio thin strip continuous casting and rolling production line and production process. Background technique [0002] After continuous casting and rolling development, representative technologies such as CSP, ISP, FTSR, ESP, MCCR have been formed. In recent years, the headless continuous hot rolling technology represented by the Italian Arvedi's ESP has achieved good industrial applications, and can stably produce thin strip steel with a thickness of less than 1.2mm, breaking through the thickness forbidden zone that cannot be covered by conventional hot rolling. Compared with conventional hot continuous rolling, ESP has the following advantages: Endless rolling eliminates strip threading and tail flicking, which greatly improves the control accuracy and stability of the overall length of the coil; continuous casting and rolling lines Tightly connected, h...

AI Technical Summary

Problems solved by technology

However, it still exists in the realization of ferrite rolling in the true sense: 1. Cooling between stands and after rolling, resulting in large temperature fluctuations; 3. If the final rolling and coiling temperature are to be guaranteed, the entrance temperature of the finishing rolling will be in the two-phase region of austenite and ferrite, which will cause the mixed crystal phenomenon of the final structure and affect the performance

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