Roll outer layer material for hot rolling and method of...

Details Roll outer layer material for hot rolling and method of... Roll outer layer material for hot rolling and method of...

C - Chemistry, Metallurgy

22

C

C22C 38/26 (2006.01) B21B 27/02 (2006.01) B22D 13/00 (2006.01)

Patent

CA 2166258

A roll outer layer material for hot rolling consists essentially, as analyzed in weight percent, of 2.5-4.0% C, 6.0-20% Cr, 3.0-10.0% V, 0.6-5.0% Nb, 2.0-15% Mo, 3.0% or below Si, 3.0% or below Mn, C, V, Nb and Cr satisfying a following formula (1), 10.5 <= 6.5.C(%) - 1.3.V(%) - 0.7.Nb(%) <= 2.Cr(%) - 2 ...(1), and the balance being Fe and incidental impurities. A method of manufacturing a roll for hot rolling comprises the steps of centrifugally casting an outer layer material having the above composition, centrifugally casting graphite steel containing 0.5% or above of C as an intermediate layer, and casting an axis material which is a spheroidal graphite cast iron, a flake graphite cast iron or a graphite steel. C is present in the intermediate layer in an amount which satisfies a following formula (2), C(%) (intermediate layer ) >= 2.0 - 0.5 [C(%) - 0.2V(%) - 0.11Nb(%)] (outer layer) ... (2).

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