Nickel Alloy Incoloy 800 UNS N08800

Incoloy 800 was the first of these alloys and it was slightly modified into Incoloy 800H. This modification was to control carbon (.05-.10%) and grain size to optimize stress rupture properties. Incoloy 800HT has further modifications to the combined titanium and aluminum levels (.85-1.20%) to ensure optimum high temperature properties.The nickel alloy is dual certified (800H/HT) and combines the properties of both forms.

Alloy 800 (UNS N08800) Chemical Composition, %

Mechanical Properties

Typical room temperature Tensile Properties of Annealed Material

• Excellent corrosion resistance in the water media of the extremely high temperature of 500C.
• Good stress corrosion resistance
• Good machining
• High creep strength
• Very good resistance to oxidation
• Good resistance to combustion gases
• Very good resistance to carburization
• Good resistance to nitrogen absorption
• Good structural stability at high temperatures
• Good weldability

The main difference between alloys 800, 800H and 800HT is mechanical properties. The difference is due to the limited composition of the 800H and 800HT alloys and the high temperature annealing used for these alloys. In general, 800 alloys exhibit higher mechanical properties at room temperature and short exposure to high temperatures, while 800H and 800HT alloys exhibit excellent creep and fracture strength during prolonged exposure to high temperatures.

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