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This diploma thesis deals with methods of heat treatment of tool steel. The thesis briefly describes iron alloys and their properties, possible heat treatment is described. In the experimental part, there is hardening of K720 steel, (ČSN 41 9312) into various hardening environments is performed and mechanical properties such as hardness, impact work and steel strength are detected. The results evaluate the best heat treatment for blade production, both functional and ecological. According to the best method of heat treatment, the production of the product will be realized.

This thesis deals with heat treatment and chemical heat treatment of steel. The first part is devoted to the theory of heat treatment and chemical heat treatment and detailed description of the most used methods. Next, the work describes the tests used in the practical measurement. In the experimental part, there is hardness comparison of unalloyed and low-alloyed steels after chemical heat treatment in six ways. The resulting structures are evaluated metallographically. In the last part, the work evaluates the influence of chemical heat treatment on corrosion resistance after salt spray test. Conclusion is devoted to the discussion about application of chemical heat treatment in technical practice.