The forming process is associated with the plastic deformation capability of materials. The formability of metals and alloys is influenced by physical-metallurgical properties of material and by external forming conditions, forming temperature in particular. A kind of borderline for the division of forming is the recrystallization temperature, according to which forming is divided into cold forming, partially hot forming and hot forming. The paper is concerned with problems of optimizing the temperature of forming grade 100CrMo7-3 bearing steel under partial heating. Experimental establishment of the optimum range of forming temperatures was based on the results of tensile testing at elevated temperatures from 100 to 800 °C. Experimental verification of the behaviour of bearing steel under pressure was conducted via the upsetting test at elevated temperatures. The experimental part of the work is also concerned with the analysis of phase composition of grade 100CrMo7-3 bearing steel using computer simulation, and by the verification of simulation via metallographic evaluation.