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Incoloy 800HT

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.

ASTM B408 UNS N08811 (Incoloy 800HT) rods.

ASTM B408 UNS N08811 (Incoloy 800HT) rods. O.D=52 mm.

Incoloy 800, 800H & 800HT have nearly identical chemical composition and physical properties. The major differences between these alloys are their mechanical properties which stem from the restricted compositions of alloys 800H and 800HT and the high-temperature anneals used for these alloys. In general, alloy 800 has higher mechanical properties at room temperature and during short-time exposure to elevated temperatures, whereas alloys 800H and 800HT have superior creep and rupture strength during extended high-temperature exposure.

Incoloy 800HT serpentine coils for the heat exchanger.

Incoloy 800HT serpentine coils for the heat exchanger.

1. Chemical Composition Requirements

The Chemical Composition of Incoloy 800, %
Nickel30.0-35.0
Cromium19.0-23.0
Iron≥39.5
Carbon0.06-0.10
Aluminum0.25-0.60
Titanium0.25-0.60
Manganese≤1.50
Silicon≤1.00
Sulfur≤0.015
Copper≤0.75
Al+Ti0.85-1.20

2. Mechanical Properties of Incoloy 800HT

Tensile Strength, min.Yield Strength, min.Elongation, min.Hardness, min.
MpaksiMpaksi%HB
600872954344138

3. Physical Properties of Incoloy 800HT

DensityMelting RangeSpecific HeatElectrical Resistivity
g/cm3°C°FJ/kg. kBtu/lb.°FµΩ·m
7.941357-13852475-25254600.110989

4. Product Forms and Relative Standards

Product FromStandard
Rod and BarASTM B408, EN 10095
Plate, Sheet & StripASTM A240, A480, ASTM B409, B906
Seamless Pipe & TubeASTM B829, B407
Welded Pipe & TubeASTM B514, B515, B751, B775
Welded fittingsASTM B366
ForgingASTM B564, DIN 17460

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