Outer layer material used for centrifugal roller

The invention discloses an outer layer material of roller, which solves the problem of ensuring performance of the roller and reducing the manufacturing cost. The technical measures for problem solving include: components and their weight percent: C: 3.1 to 3.5, Si: 0.6 to 1.2, Mn: 0.4 to 0.8, S: less than or equal to 0.03, Cr: 1.5 to 2.0, Mo: 0.2 to 0.5, Ni: 3.6 to 3.9, Cu: 0.2 to 1.0, and others are Fe and inevitable imparities. Compared with the prior art, the invention replaces partial Ni with easily available Cu element, which not only reduces the manufacturing cost and has good economicbenefit, but also the performance of the roller is stable, which meets the demand of the users.