STEEL FOR VESSEL STRUCTURES OF NUCLEAR POWER STATIONS Russian patent published in 2010 - IPC C22C38/60 C22C38/52 

FIELD: metallurgy.

SUBSTANCE: invention refers to metallurgy of structural steel and can be implemented at fabrication of vessel structures of nuclear power stations. Steel contains carbon, silicon, manganese, chromium, nickel, molybdenum, vanadium, copper, aluminium, calcium, cobalt, nitrogen, niobium, sulphur, phosphorus, arsenic, antimony, tin and iron at the following ratio of elements, wt %: carbon 0.15 - 0.18, silicon 0.17 - 0.37, manganese 0.30 - 0.60, chromium 2.70 - 3.00, nickel 0.20 - 0.40, molybdenum 0.60 - 0.80, vanadium 0.25 - 0.35, copper 0.01 - 0.07, aluminium 0.005 - 0.01, calcium 0.01 - 0.05, cobalt 0.005 - 0.025, niobium 0.03 - 0.05, nitrogen 0.005 - 0.04, sulphur 0.002 - 0.007, phosphorus 0.002 - 0.007, arsenic 0.005 - 0.01, antimony 0.001 - 0.005, tin 0.001 - 0.005, iron - the rest. Summary contents of phosphorus, tin, antimony and arsenic are not more 0.02, while summary contents of nickel. Copper and cobalt are not more 0.45.

EFFECT: upgraded strength and viscosity of steel, operational reliability, safety and increased operational resource of nuclear reactor vessels.

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