| 摘要 |
Provided is a centrifugally cast composite roll for hot rolling in which: an outer layer (1) that is formed by centrifugal casting and an inner layer (2) comprising a ductile cast iron are integrated by welding; the outer layer has a chemical composition that includes, by mass, 1-3% of C, 0.4-3% of Si, 0.3-3% of Mn, 1-5% of Ni, 2-7% of Cr, 3-8% of Mo, 3-7% of V, 0.01-0.12% of B, and a remainder of Fe and unavoidable impurities; the relationship that is represented by Cr /(Mo + 0.5W) < -2/3[C - 0.2(V + 1.19Nb)] + 11/6 (wherein W = 0 and Nb = 0 when W and Nb are not included) is satisfied; and 1-15% of an MC carbide, 0.5-20% of a charcoal boride, and 0.5-20% of an Mo-based carbide by area ratio are included therein. |
