Incoloy alloy 800H (UNS N08800)

  • Enhanced strength to endure high temperature
  • Better strength to endure creep rupture
  • Oxidation resistance & carburization resistance
  • Corrosion resistance for acidic environments
  • Resistance to deteriorating sulfur atmospheres
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A variant of Incoloy 800, Incoloy Alloy 800H is a nickel-chromium-iron based alloy that flaunts excellent oxidation resistance & ample strength. It also shows resistance to carburization when exposed to high-temperature environments.

Incoloy 800, 800HT, & 800H are almost similar in terms of properties. However, the difference in 800H comes from the fact that there is a higher percentage of carbon in this alloy. Apart from this, the alloy also brings in 1.20% aluminum, while 800HT brings titanium in the quotient.

Common Names:

  • UNS N08810
  • UNS N08811
  • Alloy 800H

Executive Standards:

  • ASTM B 409
  • ASME SB 409
  • AMS 5871

Chemical Properties:

Nickel (%)30.0 to 35.0
Chromium (%)19.0 to 23.0
Iron (%)39.5 Minimum
Carbon (%)0.05 to 0.10
Aluminum (%)0.15 to 0.60
Titanium (%)0.15 to 0.60
Aluminum + Titanium (%)0.30 to 1.20

Mechanical Properties:

Tensile Strength77,000
Yield Strength29,000
Hardness126 Brinell

 Physical Properties:

Specific HeatBTU/lb-°F0.11
Elasticity ModulusPsi28.5 x 106
GPa196.5 GPa
Melting Range°F2475 to 2525
°C1357 to 1385
Thermal ConductivityBTU/hr/ft2/ft/°F10.6
Electrical ResistivityAt 68°F59.5
At 20°C99

Key Features:

  • Creep-Rupture Properties: The close chemistry control & solution annealing treatment for heat caters to the need for creep-rupture resistant properties.
  • Oxidation Resistance: The high chromium & nickel combination in this alloy caters to the oxidation resistance requirement.
  • Corrosion Resistance: The alloy flaunts corrosion-resistant properties, especially when used within the nitric & organic acid environments.
  • Easy Fabrication: Alloy 800H can easily be welded & processed with the help of the standard fabrication processes.

Product Forms Available:

  • Plate
  • Sheet
  • Bar
  • Wire
  • Tube & Pipe
  • Fittings


  • Quench boilers for ethylene furnace
  • Fittings, Valves, & Other Components
  • Hydrocarbon Cracking
  • Equipment for heat treatment
  • Industrial furnace
  • Petrochemical & chemical processing
  • Re-heaters & super-heaters for power plants
  • Heat exchangers
  • Pressure vessels

Possible Alternative Grades:

  • Incoloy Alloy 800: This is the prime alloy from which 800H is derived while keeping the features the same, just with more carbon content.
  • Incoloy Alloy 800HT: Alloy 800HT is pretty similar to 800H & is used for its corrosion-resistant features.

Frequently Asked Questions:

  • How is Alloy 800H machined?

Alloy 800H should be machined only when present in its annealed condition. Given the fact that this alloy is prone to hardening during work, it should be machined in low-cutting speed.

  •  Is Incoloy Alloy 800 similar to Alloy 800H?

Yes, Incoloy Alloy 800H is actually a controlled derivative of alloy 800 with the prime difference in carbon composition.

  • What is the machining process used for Alloy 800H?

In general, machining involves threading, drilling, CNC shaping, milling, tapping, turning, flanges, & more. However, some metals alloy like 800H needs to be annealed prior to machining.

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