HEAT-RESISTANT HIGH-DUCTILE AUSTENITE STEEL Russian patent published in 2011 - IPC C22C38/58 

FIELD: metallurgy.

SUBSTANCE: steel contains carbon, chromium, manganese, nickel, aluminium, boron, cerium, silicon, tungsten, vanadium, niobium, iron and unavoidable impurities at following ratio of components, wt %: carbon 0.02 - 0.06, silicon 0.10 - 0.40, manganese 16 - 19, chromium 14 - 16, nickel 5.5 - 7.0, tungsten 0.5 - 0.9, vanadium 0.1 - 0.2, niobium 0.1 - 0.2, aluminium 0.3 - 0.9, cerium 0.05 - 0.20, boron 0.002 - 0.050, iron and unavoidable impurities - the rest. For components of steel there is maintained condition: ([Ni]+0.5[Mn]+30[C])/[Cr]+0.5[W]+1.5[Si]+0.5[Nb])=0.8-1.0, while ratio of contents of carbon to summary contents of vanadium and niobium is 0.06-0.20.

EFFECT: raised ductility and stability of austenite at maintaining increased heat resistance.

4 cl, 4 tbl