| 摘要 |
PURPOSE:To obtain a composite roll for rolling having improved resistance to spalling and a strong and tough shaft part by specifying the residual compressive stress and tensile strength on the surface of the outside layer material of the composite roll and joining the outside layer and core material in such a way that the tensile strength of the joint part thereof is higher than the lower tensile strength of both materials. CONSTITUTION:The residual compressive stress on the surface of the outside layer material of the composite roll of which the core material consists of a cast steel and forged steel is specified to at least >=20kg/m<2>. The tensile strength of the core material is made >=50kg/cm<2> or for the core material having internally a defect, the tensile strength thereof is made 2divided by piX50X(piXr)<1/2>kgmm.<-2> where the defect is coverted equivalently to a disk perpendicular and the disk radius is designated as (r). The tensile strength in the joint part between the outside layer and the core material is made higher than at least the lower tensile strength of the outside layer and the core material. |
