HEAT RESISTANT STEEL FOR STEAM POWER INSTALLATIONS AND POWER UNITS WITH OVERCRITICAL PARAMETRES OF STEAM Russian patent published in 2011 - IPC C22C38/32 

FIELD: metallurgy.

SUBSTANCE: heat resistant steel contains carbon, silicon, manganese, chromium, nickel, molybdenum, vanadium, niobium, aluminium, tungsten, nitrogen, boron, yttrium, hydrogen, calcium, sulphur, phosphorus and iron at following ratio of components, wt %: carbon 0.01-0.15, silicon 0.2-0.5, manganese 0.2-0.5, chromium 10.0-12.0, molybdenum 0.4-0.8, tungsten 0.4-1.2, vanadium 0.1-0.3, niobium 0.02-0.06, aluminium 0.01-0.05, nitrogen 0.01-0.05, boron 0.001-0.005, yttrium 0.002-0.01, hydrogen 0.0005-0.003, calcium 0.001-0.005, sulphur 0.005-0.01, phosphorus 0.005-0.02, iron - the rest. Summary contents of carbon and nitrogen does not exceed 0.16 %, summary contents of sulphur and phosphorus (S+P) does not exceed 0.025%, while molybdenum equivalent determined with ratio (Mo+0.5W) does not exceed 1.0 %.

EFFECT: raised operational reliability and total resource of operation of modern steam power equipment of heat power units of electric stations due to increased stability of complex of main physical-mechanical properties.

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