Abstract: A warm-rolling mill with two hot coil boxes was designed to process difficult-to-deform metals strip. A numerical model was built to calculate strip coil temperature in a two dimensional cylindrical coordinate system， which considered the heat transferring along radial and axial directions. The thermal conductivity coefficient of radial direction was calculated according to the structures of strip layer， oxide layer and interface layer. The axial and radial explicit and implicit differential equations were deduced by finite differential method， solved by the alternating direction implicit method(ADI). The boundary condition of heat transfer coefficient was dominated by radiation mechanism， where a correction coefficient was introduced to consider other factors. The strip coil heating temperature was firstly measured through experiment. Then a linear relation between the actual temperature and heating time was regressed. After using the correction coefficient of heat transfer optimized by the actual temperature， the temperature can be calculated by the model， with the error within ±2℃ compared with the experimental temperature.

Key words: difficult-to-deform metal, warm-rolling, strip coil, heating temperature, finite differential method