A production line and production process for continuous casting and rolling of thin strip steel with low yield strength ratio

Abstract

The invention belongs to the technical field of continuous casting and rolling of iron and steel, and specifically discloses a continuous casting and rolling production line and production technology of thin strip steel with low yield ratio. The production line includes a continuous casting machine, a high-pressure water rough descaling device, a rough rolling unit, a pendulum shear, a waste billet push-out and stacking device, an emergency shear, an induction heating furnace, and a high-pressure water fine descaling device arranged in sequence along the rolling direction. , Finishing rolling unit, high-speed flying shear and coiling unit. The production process is as follows: continuous casting billet→rough descaling with high-pressure water→rough rolling→induction heating→finish descaling with high-pressure water→finish rolling→coiling with high-speed flying shear→coiling. The invention realizes the production of thin strip steel with high surface quality and low yield ratio by adding rough descaling, reducing the number of induction heating groups, lengthening the distance between finishing rolling intermediate stands, and shortening the distance between finishing rolling stand and coiler. , due to the reduction of rolling line equipment and shortened production line length, the production line construction and operating investment costs can be reduced.

Description

technical field [0001] The invention relates to the technical field of continuous casting of iron and steel, in particular to a continuous casting and rolling production line and production technology of thin strip steel with low yield ratio. Background technique [0002] Continuous casting and rolling has been developed and has formed representative technologies such as CSP, ISP, FTSR, ESP, and MCCR. In recent years, the endless continuous hot rolling technology represented by Arvedi's ESP in Italy has achieved good industrial application, and can stably produce thin strip steel with a thickness below 1.2mm, breaking through the forbidden thickness zone that conventional hot continuous rolling cannot touch. Compared with conventional hot continuous rolling, ESP has the following advantages: Endless rolling eliminates strip threading and tailing, which greatly improves the control accuracy and stability of the size and performance of the steel coil; the continuous casting an...

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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