PROCEDURE FOR COMPLEX CRYOGENIC-DEFORMATION TREATMENT OF STEEL Russian patent published in 2011 - IPC C21D8/00 C21D6/04 C21D6/00 

FIELD: metallurgy.

SUBSTANCE: there is melted austenite steel containing components at following ratio, wt %: carbon 0.01-0.20, chromium 13.0-18.0, nickel 6.0-16.0, aluminium 0.1-2.5, tungsten 2.0-4.0, manganese to 0.3, titanium to 0.3, silicon to 0.3; copper to 0.2; sulphur to 0.03; phosphorus to 0.03; iron and unavoidable impurities - the rest at meeting condition: sum of chromium and nickel is 20.0-32.0. Further, steel is quenched and subjected to plastic deformation at cryogenic temperatures in several stages, to low temperature tempering upon each stage and to high temperature tempering and ultra-sonic treatment within the range of working frequencies f=18÷22 kHz.

EFFECT: raised corrosion resistance of steel, upgraded strength and magnetic characteristics.

2 ex, 2 tbl