NAS 800H (NCF 800H, UNS N08810)/NAS 800T (UNS N08811) are nickel-iron-chromium alloys that provide high strength and excellent resistance to oxidation and carburization at high temperatures
Incoloy 800H Pipe Fittings (UNS N08810) is in fact an iron-nickel-chromium alloy having the same basic composition as Incoloy 800, with significantly higher creep rupture strength.
