| 摘要 |
A centrifugal cast roll shell material composed of a granular MC carbide, graphite and C: 2.5 to 4.7%, Si: 0.8 to 3.2%, Mn: 0.1 to 2.0%, Cr: 0.4 to 1.9%, Mo: 0.6 to 5%, V: 3.0 to 10.0% and Nb: 0.6 to 7.0%, satisfying the following formulae (1), (2), (3) and (4): 2.0 + 0.715 V + 0.10 Nb ~ c (%) ...(i) 1.1 ~ Mo/Cr ...(2) Nb/V ~ 0.8 ...(3) 0.2 ~ Nb/V ...(4), the remainder being Fe and inevitable impurities, wherein the pouring temperature is 1,400.degree.C or higher.
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