| 摘要 |
PURPOSE:To provide a conjugated roll combining high hardness with wear resistance, by applying the building-up of nickel chromium-type cast iron to the outside periphery of the steel core material of a roll and by subjecting the above to hardening at a specific temp. and then to high-temp. tempering treatment. CONSTITUTION:The overlay welding of a nickel chromium-type cast-iron material is applied to the outside periphery of a steel core material by an electroslag remelting process, which is used as an outer layer to form a conjugated roll. Subsequently, this conjugated roll is hardened at 950-1,150 deg.C, heated and held at a high-temp. tempering temp. of 475-525 deg.C for about 1-10hr, and successively subjected to rapid cooling, slow cooling, and subzero cooling. By this method, the conjugated roll having a high hardness of >=about 91 Shore hardness and wear resistance can be obtained. |
