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Incoloy 800HT, also known as “Alloy 800HT”, is designated as UNS N08811 or DIN W.Nr. 1.4959. It is an iron-nickel-chromium alloy having the same basic composition as Incoloy 800 and Incoloy 800H but with significantly higher creep-rupture strength. The higher strength results from deliberate control of the carbon, aluminum, and titanium contents in conjunction with a high-temperature anneal. Used in chemical and petroleum processing, in power plants for superheater and reheater tubing, in industrial furnaces, and for heat treating equipment.
Incoloy 800HT is primarily used in applications with temperatures up to 1100° F, where 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. Incoloy 800HT will not become embrittled even after long periods of usage in the 1200-1600° F range where many stainless steels become brittle. Excellent cold forming characteristics typically associated with the nickel-chromium alloys are exhibited with 800HT. When cold formed extensively the grain size produces a visibly undulated surface called “orange peel”. Incoloy 800HT can be welded by the common techniques used on stainless steels.
Nickel | 30.0-35.0 |
Cromium | 19.0-23.0 |
Iron | ≥39.5 |
Carbon | 0.06-0.10 |
Aluminum | 0.25-0.60 |
Titanium | 0.25-0.60 |
Manganese | ≤1.50 |
Silicon | ≤1.00 |
Sulfur | ≤0.015 |
Copper | ≤0.75 |
Al+Ti | 0.85-1.20 |
Tensile Strength, min. | Yield Strength, min. | Elongation, min. | Hardness, min. | ||
|---|---|---|---|---|---|
Mpa | ksi | Mpa | ksi | % | HB |
600 | 87 | 295 | 43 | 44 | 138 |
Density | Melting Range | Specific Heat | Electrical Resistivity | ||
|---|---|---|---|---|---|
g/cm3 | °C | °F | J/kg. k | Btu/lb.°F | µΩ·m |
7.94 | 1357-1385 | 2475-2525 | 460 | 0.110 | 989 |
Sulphuric acid piping and vessels
Phosphoric acid evaporators
Pickling tank heaters, pickling tanks and equipment
Chemical process equipment
Propellor shafts
Tank trucks
Calorifiers
Electrostatic precipitator electrodes
Hot vessels for food, water and seawater,
ammonium sulphate vessels
Expansion bellows
Marine exhaust systems
Power station ash hoppers
Industrial furnaces
Heat-treating equipment
Chemical and petrochemical processing
Super-heater and re-heaters in power plants
Pressure vessels
Heat exchanger
