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Incoloy 800

Designated as UNS N08800 or DIN W.Nr. 1.4876, Incoloy 800 (also known as “Alloy 800”) is an iron-nickel-chromium alloy with good strength and excellent resistance to oxidation and carburization in high-temperature atmospheres. It also has excellent resistance to corrosion by many aqueous environments and resistance to chloride stress-corrosion cracking. Incoloy 800 alloy maintains a stable austenitic structure during prolonged exposure to high temperatures since it doesn’t form the embrittling sigma phase after long time exposure at 1200°F [649°C]. It’s mainly used for petrochemical process piping, heat exchangers, carburizing equipment, heating element sheathing, and nuclear steam generator tubing.

ASTM B564 Incoloy 800 Weld Neck Flange

ASTM B564 Incoloy 800 weld neck flange, 3″ SCH80 600#, ASME B16.5.

1. Chemical Composition Requirements

The Chemical Composition of Incoloy 800, %
Ni30.0-35.0
Cr19.0-23.0
Fe≥39.5
Ti0.15-0.60
Al0.15-0.60
C≤0.10
Mn≤1.50
Si≤1.00
S≤0.015
Cu≤0.75

2. Physical Properties of Incoloy 800

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

3. Mechanical Properties of Incoloy 800

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

4. Product Forms and 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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