In the field of hot strip mill finishing train, the demands for not only high quality of sheet product shape and sheet surface condition but also high productivity and energy saving in rolling are increasing. In this circumstance, we have developed completely new type compound roll which is composed of high-carbon high speed steel of outer shell and forged steel of core material to meet the requirement of high reliability as well as high wear resistance.
After many experiments, the first trial of this new compound high-carbon high speed steel rolls was made in 1987 in finishing train of hot strip mill. Since then more than one hundred fifty new compound rolls have been used in hot strip mill finishing train. These new compound rolls are contributing the high productivity of rolling and the improvement of sheet products.