Alloy 800

Nickel Alloy 800
UNS N08800/N08810/N08811

Stainalloy is highly experienced in the supply of Alloy UNS N08800/N08810/N08811 piping materials. For over 20 years, Stainalloy has been dealing with Alloy 800 and has gained unmatched technical know-how and excellent relationships with the leading manufacturers.

Alloy 800, 800H, and 800HT are high strength nickel-iron-chromium alloys that exhibit superior resistance to carburization and oxidation during high-temperature exposure. These nickel steel alloys are identical except for the higher level of carbon in alloy 800H, and the addition of up to 1.20% aluminum and titanium in alloy 800HT. These alloys are resistant to embrittlement from precipitation of sigma phase and chloride stress-corrosion cracking due to the nickel content. The corrosion resistance is quite high. In the solution annealed condition, alloys 800H and 800HT have excellent creep and stress rupture properties.

Alloy 800 is mainly used in applications with temperatures up to 1100° F, whereas alloys 800H and 800HT are normally used in temperatures above 1100° F where resistance to creep and rupture is required. The chemical balance allows the nickel steel alloy to exhibit excellent resistance to carburization, oxidation and nitriding atmospheres.

Alloy 800HT will not become embrittled even after long periods of usage in the 1200-1600° F range where many stainless steels become brittle.

Stainalloy stocks ½” up to and including 8” seamless Alloy 800 pipes manufactured by only the most reputable mills in accordance with ASTM B407.

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