Cold Rolling

If a rolling process takes place below the recrystallisation temperature of the material being processed, it is referred to as cold rolling. The recrystallisation temperature is a material-dependent variable. It is approximately 40% to 50% of the absolute melting temperature. The absolute temperature is measured in Kelvin. It is 273.15 higher than the temperature on the Celsius scale. If the temperature of a metal falls below the recrystallisation temperature, the material solidifies during rolling. Lattice defects form in the crystal structure. Work hardening and lattice defects can be eliminated by annealing. Cold rolling requires high forming forces. Only low degrees of deformation can be achieved. This means that at the end of the process, the length is at most ten times greater than at the beginning. Cold rolling is particularly suitable for the production of thin flat products.