PRECIPITATION HARDENING STEEL (VERSIONS) AND ITEM OUT OF STEEL (VERSIONS) Russian patent published in 2010 - IPC C22C38/16 C22C38/12 C22C38/42 C22C38/46 C22C38/48 C22C38/58 C22C38/54 F04D29/04 F01B9/00 

FIELD: metallurgy.

SUBSTANCE: steel contains carbon, nickel, and at least one of elements: copper, vanadium and niobium, iron and additives at the following ratio of components, wt %: carbon ≤ 0.15, nickel 2.5÷9.0, at least one of elements: copper, vanadium, niobium in sum 0.01÷4.5, iron and additives - the rest. Composition of steel is of the following ratio: Cu+V_eff+Nb_eff≤2.5+0.3-Ni, where V_eff=V-4.2·(C-Nb/7.8)>0 is contents of vanadium left after formation of carbides, and Nb_eff=Nb-7.8·C>0 is contents of niobium left after formation of carbides.

EFFECT: raised strength at maintaining satisfactory plasticity and impact viscosity with simultaneous raised stability of mechanical properties during operation.

8 cl, 2 tbl, 1 ex