Steel Mill Rolls - An Overview

摘要

The emergence of modern rolling technologies has reemphasised the significance of in-the-mill service performance of steel mill rolls with reference to increased roll life, improved product quality and enhanced mill productivity in modern steel rolling mills has been the matter of discussion in the recent times. It has been emphasised that developmental programs towards new generation roll materials and effective roll management strategies would be of paramount significance in coming days. The present paper discusses about new generation roll materials, such as High Speed Steel (HSS) and semi-HSS which offers excellent wear resistance as well as strength properties and can be a future roll materials for hot rolling mills for flat and long products in place of currently used high chromium cast iron and cast steel rolls. It has also been enumerated that alloyed ICDP (Indefinite Chill Double Pour) can be a better substitute for the conventional ICDP rolls used in hot strip mill because of the enhanced carbide levels. The use of forged steel rolls based on 3-5% chromium suitably heat treated has been discussed for application in cold rolling mill as work rolls and as back-up rolls for almost every flat product mills. The mention has also been made of SG (Spheroidal Graphitic) iron rolls that can be a very promising material for use in many long product mills because of the inherent thermal, wear & corrosion resistance, good frictional and surface finish properties of cast iron coupled with adequate strength. The discussion in the paper will create awareness amongst steel mill and roll shop professionals about the suitability of various roll materials and qualities for use in modern rolling mills for producing hot and cold rolled steel products encompassing flat and long products.