STEEL Russian patent published in 2007 - IPC C22C38/28 

FIELD: ferrous metallurgy; composition of chromium steels used for manufacture of parts for thermal units, engines, hot deformation tools and other articles.

SUBSTANCE: proposed steel contains the following constituents, mass-%: carbon, 1.2-1.6; silicon, 1.2-1.4; manganese, 0.6-1.0; chromium, 10.0-12.0; vanadium, 1.2-1.6; molybdenum, 5.0-6.0; tungsten, 1.0-2.0; titanium, 0.2-0.4; zirconium, 0.1-0.2; hafnium, 5.0-6.0; calcium, 0.003-0.005; the remainder being iron.

EFFECT: enhanced heat resistance of steel.

1 tbl