| 摘要 |
PURPOSE:To enable producing a combined sleeve roll in which cracking is not generated in the vicinity of outer layer boundary by forming a chamber so that the boundary between the outer and inner layers is in the chamfered surface of the end corner part of the roll. CONSTITUTION:The combined sleeve roll is formed with the outer layer 4 of a sintered alloy and the inner layer 5 of a steel. The chamber 8 is formed so that the boundary between the outer and inner layers 4 and 5 is in the chamfered surface of the end corner part of the roll. The chemical composition of the outer layer of the sintered alloy is in weight, 1.0-3.5% C, <=2,9% Si, <=2.0% Mn, <=10% Cr, 3-15% W, 2-10% Mo and 1-15% V and the balance substantially Fe with inevitable impurity elements. Thus, the tensile residual stress generated in the raius direction on the end corner part of the roll is restrained. |
