STAINLESS AUSTENITIC CAST STEEL, METHOD OF PRODUCTION AND USE THEREOF Russian patent published in 2012 - IPC C22C38/06 C22C33/04 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, particularly, to stainless austenitic cast steel production. Steel containing the following is cast, wt %: aluminium from more than 0 to less than or equal to 4, silicon from 0 to 4, manganese from 0 to 25, chromium from 12 to 20, nickel from 0 to 1.2, niobium from 0 to 1.2, tantalum from 0 to 0.2, carbon from 0.01 to 0.15, nitrogen from 0.005 to 0.5, copper from 0 to 4, cobalt from 0 to 1, molybdenum from 0 to 4, tungsten from 0 to 3, titanium from 0 to 1, vanadium from 0 to 0.15, iron and impurities make the rest. Steel content belongs to the range defined by coordinates of four points (Cr_equiv=14; Ni_equiv=8), (Cr_equiv.=14; Ni_equiv=14), (Cr_equiv=22; Ni_equiv=8) and (Cr_equiv=22; Ni_equiv=16), chromium and nickel equivalents are calculated according to: Cr_equiv=%Cr+%Ni+1.5%Si+0.5%W+0,9%Nb+4%Al+4%Ti+1.5%V+0.9%Ta and Ni_equiv=%Ni+30%C+18%N+0.5%Mn+0.3%Co+0.2%Cu-0.2%Al. Produced steel is poured into a mould.

EFFECT: steel has ultimate tensile strength more than 550 MPa, specific elongation at break more than 30% and TRIP effect when under load.

10 cl