COMPOSITION OF ROLLER

摘要

PURPOSE: A cold rolling mill composition is provided to maintain high temperature strength by adding rare earth while minimizing a decline of elongation percentage and to have lowered occurrence of crack and deformation even under a condition of repetitive heating and cooling, thereby extending service life of a roller. CONSTITUTION: A cold rolling mill composition comprises is composed of, in wt%: carbon (C): 0.17-0.25; tungsten (W): 1-3; chrome (Cr): 19-22; nickel (Ni): 31-35; manganese (Mn): 1.5 or less; silicon (Si): 1.2 or less; one or two component selected between niobium (Nb) and vanadium (V):1.5-2.5; and rare earth metal 0.1-0.4.