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The paperwork considers the possibility to control the properties of the obtained experimental alloys, and also to ensure the reduction of the interaction between the resulting reaction products and materials of refractory equipment by adding filler materials to iron-aluminum thermite. There have been revealed regularities of the metal yield and the content of impurity chemical elements in the alloy composition depending on the quantity of input fillers. The analysis of the structure has been done, and hardness of the test items has been determined. The obtained experimental alloys with addition of various quantity of filler materials, according to the current standards, in chemical composition correspond to the steel grades which have been determined.