HEAT RESISTANT STEEL OF MARTENSITE CLASS Russian patent published in 2011 - IPC C22C38/54 C22C38/32 

FIELD: metallurgy.

SUBSTANCE: steel contains carbon, silicon, manganese, chromium, nickel, tungsten, molybdenum, cobalt, vanadium, niobium, nitrogen boron, sulphur, phosphorus, aluminium, copper and iron at following ratio of components, wt %: carbon not more 0.02, silicon from 0.15 to 0.2, manganese from 0.45 to 0.6, chromium from 8.5 to 9.0, nickel not over 0.05, tungsten from 1.7 to 1.75, molybdenum from over 0.5 to 0.6, cobalt from 2.8 to 3.2, vanadium 0.18 - 0.23, niobium from 0.05 to 0.08, nitrogen from 0.05 to 0.07, boron from 0.006 to 0.008, sulphur not over 0.01, phosphorus not over 0.01, copper from 0.01 to 0.05, aluminium not over 0.003, iron - the rest.

EFFECT: raised resistance to creepage and operability of steam lines and power stations operating at super-hyper-critical parametres of steam at high pressure and high operational temperature.

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