Abstract
Carburization of the surfaces of steel castings obtained by casting according to gasified models is one of the main and most significant problems of using this casting method. In the work, experiments were carried out to reduce carbon liquation in castings made of 20GL steel with a wall thickness of 15 mm by carrying out heat treatment (normalization) in two modes, and the influence of the FIL-1 modifier (Russia) on the structure of castings was evaluated. The structures were examined before and after heat treatment. It was found that before the heat treatment, samples made of 20GL steel without a modifier have the largest carbonized layer (up to 2 mm), whereas in samples with a modifier this indicator does not exceed 0.8 mm. The optimal heat treatment mode for modified samples was established (normalization at a temperature of 950 °C and holding for 1 hour), leading to the distribution of carbon from the carbonized surface of the samples over their entire cross section, refining of the structure and its transition to an equilibrium state. 
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