超快速冷却装置的开发及其在管线钢生产中的应用

Development of Ultra Fast Cooling Equipment and Its Application to Production of Pipeline Steel

考虑到传统层流冷却装置的冷却能力低、冷却均匀性差,无法满足中厚板低成本减量化的生产需求,因此开发出超快速冷却装置.超快速冷却装置的喷嘴与钢板的距离较近,以一定的角度沿轧制方向将一定压力的水喷射到板面,将板面残存水与钢板之间形成的气膜吹扫掉,从而达到钢板和冷却水之间的完全接触,实现核沸腾,进而大幅度提高冷却效率和冷却均匀性.将超快速冷却装置应用于国内某宽厚板生产线,并在此冷却装置上开发出低成本管线钢.与传统层流冷却装置生产的管线钢相比,采用超快冷工艺可大幅降低管线钢的合金含量并提高板形合格率.

Given the low cooling capacity and the poor uniformity of conventional accelerating cooling control （ACC）,ultra fast cooling （UFC） equipment was developed. With closer distance between the nozzles of the UFC equipment and the plate, cooling water sprayed with a high pressure at a proper angle along the rolling direction can clear away the vaporous film forming on the plate, thus making the water cover the plate completely and achieving nucleate boiling. Using the UFC equipment, cooling efficiency and uniformity are improved significantly and pipeline steels are developed at a low cost. Compared with the ACC, the UFC can greatly reduce both the alloy content in pipeline steels and the defective rate of plate shape.