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The article considers the technology for producing GX120Mn13 steel with high manganese content altered by a special modifier in order to improve the constructional durability of the manufactured parts. The ultra-dispersed powder of refractory metal oxides is used for the modification process. The samples are produced in the series of casting and tested mechanically. The structural research demonstrates the improvement of the steel microstructure and its mechanical characteristics. It has also revealed that the size of an austenite grain and nonmetallic inclusions on grain boundaries are reduced, and sulphide inclusions are partially dissolved, which has a positive impact on the operation characteristics of the steel.