| 摘要 |
PURPOSE:To obtain the roll material having excellent wear resistance at the time of hot rolling by using a steel material or a cast iron material contg. specified amounts of Mo, V and Cr as the outer layer material of a composite roll for hot rolling. CONSTITUTION:Alloy iron having the compsn. contg., by weight, 1.5 to 2.5% C, 0.2 to 1.5% Si, <1.5% Mn, 6 to 10% Mo, 3 to 10% V, 3 to 8% Cr and the balance Fe is used as the outer layer material of a composite rolling roll used at the time of subjecting a steel material or the like to hot rolling. Since the content of C is reduced as compared with that in a roll material made of high alloy cast iron which has conventionally been used, the brittleness in the matrix structure is reduced, toughness is made excellent and chipping is not generated in the use, and since hard double carbide of V, Mo, Cr, etc., is dispersedly present in the matrix having toughness, the composite roll for rolling having high hardness and excellent wear resistance and having prolonged service life can be obtd. |
