Hi-Cr Steel roll was developed for roughing stand & early finishing stand where the wear is basically ‘Thermo-Mechanical’ rather than abrasive in nature. The most important prevailing factor in Hi-Cr steel shell is the micro-hardness of the matrix which is governed by Chromium content of the matrix (Cr Matrix) or intern by (Cr/C) ratio with % Carbon content , ultimately result in increase in hardness, harden ability & oxidation