NATURAL AND NON-TEMPERED ROUND STEEL WITH HIGH STRENGTH, HIGH IMPACT STRENGTH, EASE OF CUTTING AND METHOD OF ITS PRODUCTION Russian patent published in 2024 - IPC C22C38/58 C22C38/60 C22C38/48 C22C38/46 C22C38/44 C21D8/06 

FIELD: metallurgy.

SUBSTANCE: invention relates to production of natural and non-tempered round steel, used as material for production of mechanical and structural parts of increased safety, in particular, automotive parts or parts for loaded units of machine building. Steel has chemical composition including the following chemical elements in wt.%: C 0.36–0.45, Si 0.20–0.70, Mn 1.25–1.85, Cr 0.15–0.55, Ni 0.10–0.25, Mo 0.10–0.25, Al 0.02–0.05, Nb 0.001–0.040, V 0.10–0.25, S 0.02–0.06, if necessary, 0<Cu≤0.25, and the rest is Fe and unavoidable impurities.

EFFECT: steel has high strength of not less than 1,000 MPa, high Charpy impact strength A_ku of more than or equal to 27 J, as well as high machinability.

11 cl, 2 dwg, 3 tbl, 6 ex