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气体喷射冷却及浸水冷却是冷轧薄钢板连续退火线最基本的冷却法。但是,这是两种极慢和极快的冷却法,其冷却速率难以改变。为适应在连续退火线上处理各种类型带钢的需要,必须有一种冷却能力可变的新冷却法。因此,在冶金研究的基础上,研制了加速冷却法,即A_cC法,以便使带铜以450m/min的线造度运行。温度从700℃左右至400℃左右(终点温度)以100至200℃/s的冷却速率过时效,而不发生带钢变形。为了研制这种新冷却法,再建了一条线速度稍慢(60m/s)、能处理商品宽带的实验作业线。通过口琴式气体雾化水冷喷嘴(A_cC喷嘴)的研制和这些喷嘴在冷却设备上的安装,发现了一种采用优化模型自适应控制法和卡曼筛选法的控制体系,使终点温度可控制在400±5℃,冷却速率控制在100～200±15℃/s。A_cC法在新日铁広畑厂和名古屋厂的连续退火作业线(CAPL)上的应用效果令人满意。
Gas jet cooling and immersion cooling are the most basic cooling methods for continuous annealing of cold-rolled steel sheets. However, there are two very slow and very fast cooling methods, the cooling rate of which is difficult to change. In order to accommodate the need to process various types of strip on a continuous annealing line, there must be a new cooling method with variable cooling capacity. Therefore, on the basis of the metallurgical research, an accelerated cooling method, that is, the A_cC method, was developed so that the copper strip is run at a line speed of 450 m / min. The temperature was aged from about 700 ° C to about 400 ° C (end temperature) at a cooling rate of 100 to 200 ° C / s without deformation of the strip. In order to develop this new cooling method, we built a new experimental line that can process commercial broadband at a slower speed (60m / s). Through the development of the harmonica gas-atomized water-cooled nozzles (A_cC nozzles) and the installation of these nozzles on the cooling equipment, a control system using an optimized model adaptive control method and a Kaman screening method was found, allowing the endpoint temperature to be controlled at 400 ± 5 ℃, the cooling rate is controlled at 100 ~ 200 ± 15 ℃ / s. The application of the A_cC method to the Continuous Annealing Line (CAPL) of the Nippon Steel Works and Nagoya Plant has achieved satisfactory results.