STEEL Russian patent published in 2008 - IPC C22C38/58 

FIELD: metallurgy.

SUBSTANCE: invention concerns metallurgy field. Particularly it concerns steel content used in transportation equipment, machine-tool construction, pump-and-compressor equipment. Steel contains carbon, silicon, manganese, chrome, nickel, molybdenum, vanadium, nitrogen, copper, boron, titanium, niobium and iron at following ratio, wt %: carbon 0.25-0.27, silicon 0.3-0.5, manganese 4.9-5.3, chrome 0.9-1.5, nickel 0.9-1.5, molybdenum 3.4-4.8, vanadium 0.4-0.45, nitrogen 0.07-0.15, copper 0.9-1.7, boron 0.005-0.1, titanium 0.1-0.2, niobium 0.3-0.5, iron is the rest.

EFFECT: increasing of steel durability.

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