| 摘要 |
PURPOSE:To manufacture a hot rolling roll having excellent durability, at the time of manufacturing a hot rolling roll, by using high carbon low alloy cast iron as a matrix, forging stock contg. high hardness metallic carbides having the shape of fine grains and thereafter executing hardening and tempering. CONSTITUTION:This hot rolling roll is manufactured by subjecting stock having a barrel containing a compsn. contg., by weight, 1.5 to 2.5% C, <1.2% Si, <1.2% Mn, 1.5 to 6.0% Cr and 4.5 to 8.0% V, contg. Mo and W so as to satisfy 1.5 to 5.0% Mo+0.5W, furthermore contg. one or more kinds among <3% Ni, <5% Co, <2% Nb and <2% Ti and the balance Fe as well as satisfying C=%VX0.24+(0.4 to 1.0)% and 0.3Cr+Mo+0.5W>2.6% and having a structure in which hard metallic carbides having the properties of >2100 Vickers hardness, >45mum average grain size (d) an <14% areal rate E1 as well as >6.7X10<-3> E1/d are dispersed into a matrix having >550 Vickers hardness to forging, hardening and tempering treatment. |
