Centrifugal cast roll shell material

Details Centrifugal cast roll shell material Centrifugal cast roll shell material

C - Chemistry, Metallurgy

22

C

C22C 37/06 (2006.01) C22C 37/08 (2006.01) B21B 27/00 (2006.01)

Patent

CA 2189668

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°C or higher.

La présente invention concerne une matière de revêtement pour rouleaux de moulage centrifuge, qui contient de 2,5 à 4,7 % de C, 0,8 à 3,2 % de Si, 0,1 à 2,0 % de Mn, 0,4 à 1,9 % de Cr, 0,6 à 5 % de Mo, 3,0 à 10,0 % de V et 0,6 à 7,0 % de Nb, ces éléments satisfaisant aux relations 1 à 4 ci-dessous: (1) 2,0 + 0,15 V + 0,10 Nb </= C (%), (2) 1,1 </= Mo/Cr, (3) Nb/V </= 0,8, (4) 0,2 </= Nb/V, le reste étant du fer et d'inévitables impuretés, et comprenant des carbures granuleux du type MC dont la température d'écoulement est d'au moins 1 400 DEG C, et du graphite.

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