Online electromagnetic monitoring of austenite transformation in hot strip rolling and its application to process optimization

¹ ArcelorMittal Global R&D, Maizières les Metz, France
e-mail: artem.marmulev@arcelormittal.com
² ArcelorMittal Global R&D, East Chicago, USA
³ National University of Science and Technology “MISIS”, Moscow, Russia

Received: 31 January 2013
Accepted: 9 April 2013

Abstract

Online detection and monitoring of phase transformation using non-destructive electromagnetic system in industrial hot strip mill processing of steels are reported. The system renders wide range of possibilities for advanced control and fine tuning of the hot rolling and run-out table cooling parameters. These in turn allow for process modifications to better control the microstructure of hot rolled bands. In particular, such modifications can attenuate the adverse effects of uncontrollable cooling of hot band coils that leads to severely non-homogeneous hot band microstructure. An example of application is given demonstrating how reducing the non-homogeneity of hot band microstructure with the aid of online hot strip mill electromagnetic system can help eliminating the off-thickness defects in advanced high strength steel full hard strips thus contributing to lowering the production costs and increasing the yield.