ADVANCED CONTROL OF COILING TEMPERATURE IN CHINA STEEL'S HOT MILL

The China Steel's 1730 mm Hot Strip Mill #1 in Taiwan underwent major modernization which was completed in 2005. This included new laminar strip cooling system with new control system. The main objectives were to produce special steel grades which meet specific structural requirements such as DP, API, and TRIP grades and achieve tight coiling temperature tolerances. Advanced coiling temperature modeling and on-line control strategies were implemented to meet these goals. The principles of applied models and control are presented along with the process control performance achieved.