INCOLOY® alloy 800H (UNS N08811) Fe base, Ni 32, Cr 21, Mn 1.5, Ti-Al strengthened. 800HT is an iron-nickel-chromium alloy having the same basic composition as Alloy 800 but with significantly higher creep rupture strength. Exhibits excellent resistance to carburization, oxidation and nitriding atmospheres. The alloy is dual certified and combines the properties of both forms.