Composition of roller

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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.COPYRIGHT KIPO 2013