STEEL Russian patent published in 2009 - IPC C22C38/32 

FIELD: metallurgy.

SUBSTANCE: steel contains carbon, silicon, manganese, chrome, vanadium, molybdenum, tungsten, titanium, zirconium, hafnium, calcium, aluminium, boron, tantalum and iron at following ratio, wt %: carbon 1.2-1.6, silicon 1.2-1.4, manganese 0.6-1.0, chrome 10.0-12.0, vanadium 0.2-0,6, molybdenum 5.0-6.0, tungsten 26.0-28,0, titanium 0.12-0.16, zirconium 0.1-0.2, hafnium 2.2-2.6, calcium 0.003-0.005, aluminium 0.12-0.16, boron 0.12-0.16, tantalum 2.2-2.6, iron is the rest.

EFFECT: increasing of steel heat-resistance.

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