The article focuses on the issue of heat treatment. The cooling curves were obtained for Isorapid 277HM with an experimental way of temperature measuring and their statistical processing. Experimental method was consistent with the test normative ISO standard 9950 (Wolfson's test). The cooling oil Isorapid 277HM was agitated with different agitation work and had a constant temperature of 50 °C. In the next part of this article the surface temperature depended combined heat transfers were calculated. The methodology was based on inverse heat transfer. The interpretation code was software ANSYS and ORIGIN.

The article is focused on the issue of heat treatment. The cooling curves were obtained for Isorapid 277HM with an experimental way of temperature measuring and their statistical processing. Material data of the material pattern 50CrMo4 were obtained from the Material Data Sheet (MDS) of Deutsche Edelstahlwerke (***, 2011). The cooling oil Isorapid 277HM was agitated with energy input 1.65 J.s −1 .kg −1 and had a constant temperature of 50 °C. In the follow of this article were showed the experimentally obtained results: geometry distortion,