HIGH-STRENGTH NON-MAGNETIC CORROSION-RESISTANT CAST STEEL, AND ITEM MADE FROM IT Russian patent published in 2012 - IPC C22C38/58 

FIELD: metallurgy.

SUBSTANCE: steel contains the following, wt %: carbon ≤ 0.06, silicium 0.1 - 1.0, chrome 19.0 - 23.0, manganese 14.0 -16.0, nickel 6.0 - 9.0, molybdenum 0.5 - 1.5, nitrogen 0.45 - 0.67, vanadium 0.01 - 0.50, niobium 0.01 - 0.30, yttrium 0.001 - 0.050, calcium 0.005 - 0.010, boron 0.001 - 0.01, and iron and inevitable impurities are the rest. Steel can also contain one or several elements of the group, wt %: tungsten 0.1 - 0.5, copper 0.01 - 2.0, cobalt 0.01 - 2.0, titanium 0.001 - 0.3, tantalum 0.001 - 0.3, zirconium 0.01 - 0.3, selenium 0.001 - 0.02. Steel composition meets the condition: 1.17*Cr_equiv-Ni_equiv<11.164, where Ni_equiv=[Ni] + 0.1[Mn] - 0.01[Mn]²+ 18[N] + 30[C] +0.5[Cu]+0.5[Co], Cr_equiv=[Cr] + 1.5[Mo] + 0.48[Si] + 2.3[V] + 1.75[Nb] + 1.5[Ti] +0.75[W]+1.75[Ta].

EFFECT: steel has high strength, ductility, corrosion resistance and weldability.

6 cl, 2 tbl