STEEL Russian patent published in 2008 - IPC C22C38/32 

FIELD: metallurgy.

SUBSTANCE: invention concerns metallurgy field. Particularly it concerns heat-resistant steel content for heat power plant parts with steam operating temperature till 620°C. Steel contains carbon, silicon, manganese, chrome, molybdenum, vanadium, niobium, calcium, cerium, nitrogen, tungsten, boron, sulphur, phosphorus and iron, at a following components ratio, mass %: carbon 0.08-0.12, silicon 0.15-0.20, manganese 0.40-0.60, chrome 8.0-9.5, molybdenum 0.4-0.6, tungsten 1.0-2.0, vanadium 0.15-0.30, niobium 0.04-0.09, calcium 0.005-0.05, cerium 0.02-0.05, nitrogen 0.03-0.07, boron 0.001-0.006, sulphur not more than 0.01, phosphorus not more than 0.015, the rest is iron.

EFFECT: improving of steel heat-resistance, long-term strength and plasticity.

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