MARTENSITE-FERRITE CORROSION-RESISTANT CHROME-NICKEL STEEL WITH IMPROVED MACHINABILITY Russian patent published in 2016 - IPC C22C38/40 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, namely to martensite-ferromagnetic corrosion-resistant steels used for production of working blades, discs, shafts, bushings, flanges, fastening and other parts. Steel contains, wt%: carbon 0.11-0.17, silicon 0.20-0.80, manganese 0.20-0.80, chrome 16.00-18.00, bismuth 0.06-0.13, calcium 0.002-0.003, aluminium 0.02-0.04, sulphur not more than 0.025, phosphorus not more than 0.030, nickel 1.5-2.5, molybdenum not more than 0.30, copper not more than 0.30, titanium not more than 0.20, vanadium not more than 0.20, tungsten not more than 0.20, iron is rest.

EFFECT: better machinability at maintaining required mechanical properties and corrosion resistance of metal, as well as improving environmental situation production due to reduced aggressiveness of hazardous emissions into ambient atmosphere.

1 cl, 2 tbl