2020 Technology and Operation of a Hot Rolling Mill

Abstract

The state-of-the-art of both technology and operational practice of a hot rolling mill are discussed. The focus is first on the control of entry temperature in the finish mill. Transfer bar cooling and induction heating are presented. Next, the safe keeping in the finishing mill of surface quality, crown and flatness are discussed. Important tools to achieve these properties are lubrication, friction measurement, roll cooling, inter stand and skin cooling, bending, shifting and prediction of roll forces. The third and final topic is the run- out table cooling. Ultra-fast cooling is compared with laminar cooling. The cooling strategies and their importance to realise the required micro-structure and properties are discussed for hot rolled Dual Phase steel, pipe line grades and rebar.