The thesis presents the heat treatment of hardening. It describes the hardening agents, types of hardening and different hardening furnaces. The main emphasis is on the determination of hardening of steel C45. Based on the results defined with the help of Jominy and Grossmans tests, we can assume that the hardening of steel C45 is not the best, which is also a result of the influence of the mass of the sample. Further on, a comparisson between the results of hardening and relaxation of samples at different temperatures is made. At the end, there is a review of the microstuctures obtained at the hardening and tempering.
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