Innovative ASR Technology for Profile Contour and Flatness Control of Electrical Steel in Multiple-Width Schedule Free Rolling

To implement SFR (Schedule-free Rolling) is an effective way to organize production flexibly and maximize production efficiency in hot rolling. In order to meet the increasingly stringent requirements of PCFC (Profile Contour and Flatness Control) of multiple-width electrical steel strips in hot rolling, the innovative ASR (asymmetry self-compensating rolling) technology is developed that has crown control, edge drop control, and wear control abilities simultaneously. Based on the ASR principle for multiple-width electrical steel, the ASR work rolls, the ASR shifting strategy, and the arranged SFR plan with a width group scheme are developed for SFR of multiple-width electrical steel strips. A comparative study on the strip profile and flatness control performance of CVC, K-WRS, and ASR technologies with work roll wear contours variation within the entire rolling campaign is carried out. The ASR technology of multiple-width electrical steel strips has been industrially tested and applied on the production hot strip mills with the high-quality crown hit rate increased and work roll wear contours improved significantly, which provides an innovative way to new generation high-tech PAI (PCFC All-in-one Integrated, “π” briefly) hot strip mills.