EUROPEAN STEEL TECHNOLOGY AND APPLICATION DAYS 2017 - ESTAD 2017

POSCO has developed CEM® (Compact Endless cast and rolling Mill) process, which is based on high casting speed with 6~8m/min and endless rolling from mold meniscus to down coiler. Mechanical design improvement and high speed technology development have been achieved through various efforts such as the mold pool flow control, water cooling in the caster and the mold level hunting control. For stable change of coil thickness and width during endless rolling, the control softwares of casting and rolling have been reinforced continuously against a lot of abnormal situation, successively. Owing to the endless rolling technology, the production ratio of ultra-thin gauge HR coils was increased significantly over 70% but, on the contrary, the cobble ratio in the rolling region was greatly decreased. Because the temperature and the speed of the strip directly after finishing mill are constant during endless rolling, the strip temperture on the run-out table for AHSS can be controlled well.