The article presents the results of tests of influence of the thermo-mechanical treatment parameters (such as temperature, cooling conditions) on the mechanical properties and microstructure of steel 23MnB4 indicated for cold-heading. The process of rolling was conducted in simulation in continuous finishing train arrangement of four rolling stands in a laboratory of Faculty of Metallurgy and Materials Engineering VSB Ostrava. Results of presented tests will be applied for optimization of the rolling process on rolling mill type MORGAN equipped with a system of regulated cooling Stelmor. Achieved results for steel 23MnB4 will be useful for optimization of heat-plastic treatment in order to achieve products with good mechanical properties.