Alloy, Corrosion- And Heat-Resistant, Bars, Forgings, Rings And Stock For Forgings, Rings Or Heading 29Fe - 22Cr - 21Ni - 18.5Co - 3.2Mo - 2.8W - 0.78Ta 0.30Al - 0.05La - 0.20N (Hs-556) Solution Heat Treated