Förfarande för ythärdning av termovalsar

摘要

The invention relates to a method for hardening steel rolls. In the method, the residual stress distribution resulting from the hardening is changed to correspond essentially to the stress load caused by the thermal load of the thermo roll. In the method, the thermo roll is first preheated to the Ms temperature or above it, then surface heated for hardening to above temperature A3, and finally quenching is carried out and continued until the temperature falls below about 160{C.