The main provisions and laws of the theory of heat exchange processes, methods for calculating stationary and non-stationary heat flows are presented. Information is given on fuel and its combustion, metal heating, gas movement and heat exchange in furnaces, general provisions for calculation and design of flame and electric forge furnaces, electric heating induction plants. Methods of increasing the efficiency of furnaces, as well as the process of high-speed and non-oxidative heating are considered. Refractory lining systems are presented, some methods for selecting heat generating devices and their calculation are described. For students of universities of metallurgical and machine-building areas of training, as well as specialists from machine-building and metallurgical plants.