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Heat treatment of steel consists of heating and cooling the object according to a given heat-time cycle with the aim of achieving a certain microstructure and technological or use properties. The time of heating and holding depends on influencing factors originating from the properties of the material and construction of the workpiece, the construction of the furnace and the given heat treatment procedure. The paper analyzed the influence of the distribution of the temperature field in the furnace and the shape of the objects made of carbon steel C20 and S235JR on the heating time and the heat transfer coefficient. Based on the experimentally recorded heating curves, a mathematical model is set up in the paper for determining the heat transfer coefficient of a chamber electric furnace without a protective atmosphere, assuming the heating of „thermodynamically thin“ objects according to Newton's model. The proposed mathematical model is applicable for creating technological instructions for the preparation of heating of steel objects in annealing, hardening and tempering procedures in chamber electric furnaces.
heat treatment; heat transfer coefficient; Newton’s heating model
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