HEAT-RESISTANT STEEL OF MARTENSITIC CLASS Russian patent published in 2016 - IPC C22C38/54 

FIELD: metallurgy.

SUBSTANCE: invention relates to heat-resistant chromium martensite steel used for manufacture of blades of turbine power plants. Steel contains components in following ratio, wt%: carbon 0.08-0.12, silicon less than 0.1, manganese 0.05-0.1, chromium 9.5-10.0, nickel not more than 0.2, tungsten 2.3-3.0, molybdenum 0.05-0.1, cobalt 2.5-3.5, vanadium 0.18-0.25, niobium 0.04-0.07, nitrogen no more than 0.003, boron 0.008-0.013, rhenium 0.1-0.2, sulphur no more than 0.006, phosphorus no more than 0.01, aluminium no more than 0.01, copper 0.05-0.3, titanium no more than 0.01, iron - balance.

EFFECT: higher long-term strength values, which allows using steel in heat engineering lift working temperature of thermal power plants to 630°C.

1 cl, 3 tbl, 1 ex