| 摘要 |
PURPOSE:To improve the equipment operation rate, etc. by performing a buildup welding with the heat resistant, corrosion resistant and wear resistant metal material containing the prescribed wt% Cr on the surface of a roll shell, then by forming a remelt zone in the prescribed width by melting with the specified heat input quantity. CONSTITUTION:The surface of a shell part 1 is formed in a flat cylindrical face after performing the buildup welding of the heat resistant, corrosion resistant and wear resistant metal material of a martensite group, etc. containing 11-19% Cr on the surface of the shell part 1 of a roll. The remelt zone 2 in 2-10mm width is then formed in serial state with the small heat input of 600-1,500 Joule/cm without using any filler rod by TIG welding method, etc. for the surface thereof. A crack is caused along the direction of the remelt zone 2 in short time after using the roll, but the thermal stress is released, so the generation of a big crack in the other direction can be prevented. In this way, the roll life is extended and the improvement in the equipment operation rate and reduction in the equipment cost are enabled. |
