The critical overburning temperature of chromium forged steel was experimented and discussed by DSC method and metallographic analysis of heat-treatment samples. Temperature increase during forging process and effects of some alloying elements on overburning temperature were simulated respectively by using Deform-3D and Thermo-calc software. The results of linear regression analysis showed that increased temperature has a prop relationship between volume and rate of forging process. Besides, a monotonic decreasing relationship is found between the content of alloying elements with overburning temperature in the scope of the composition of chromium forged steel. It is found that carbon has the major effect on the overburning temperature.