Among the priority tasks for the development of the country's metallurgical complex, the problem of improving the quality and reducing the cost of metal products remains relevant. Improving the quality characteristics of structural steels is carried out at all technological stages of steel production. The thermodynamics of the phosphorus oxidation reaction, macrokinetics of oxidation processes, phase composition, structure and physicochemical properties of multicomponent slags of the CaO-SiO2-FeO-MnO-P2O5-MgO and CaO-SiO2-B2O3-Al2O3 system, including viscosity, equilibrium interphase distribution of sulfur and boron during out-of-furnace processing of steel.

The results of fundamental research form the basis for the development of innovative technological solutions that provide:

- smelting of intermediate steel in oxygen converters and modern EAFs under magnesium slag of rational composition with a guaranteed low phosphorus content and high durability of the refractory lining of steel-smelting units;

-deep desulfurization and direct microalloying of structural steel grades with boron in ladle-furnace installations using environmentally friendly boron-containing slag.

The introduction of developed innovative technological solutions ensured the production of low-carbon boron-containing structural steels of a new generation, sparingly alloyed with manganese, with low phosphorus and sulfur content and a complex of increased mechanical properties, incl. for large-diameter pipes of strength category X80 without heat treatment with the prospect of reaching strength category X100-X120.