Nickel Alloy 800/800H/800HP

UNS N08800/UNS N08810/UNS N08811


Optimize Your Equipment with Alloy 800HP

Because of its unique ability to sustain extreme temperatures, Alloy 800 is ideal for construction tasks and materials. James Duva is a highly specialized alloy 800 distributor that will work with you to get you the best alloy for the job.

This nickel-iron-chromium alloy has several desirable traits. First, the chromium helps resist corrosion and oxidation while the nickel resists cracking from chloride stress-corrosion. The iron element also resists to internal oxidation, and all these elements together create a completely durable alloy.

Each metal contributes something useful to the overall makeup of alloy 800, but the special combination of titanium and aluminum levels make this alloy especially useful for high temperature applications.

Typical Applications

This alloy works well in construction, but “construction” encompasses quite a few different industries. The list below gives you outlines how others use alloy 800, 800H, and 800HP:

  • Heat treating equipment: baskets, trays, fixtures
  • Chemical/petrochemical processing: heat exchangers and piping systems
  • Nuclear power plants: super heater and re-heater tubing
  • Paper and coal conversion plants

Anything that involves high temperature reactors, quench system piping, or convection tubing will typically require an alloy similar to 800 because of its ability to deal with extreme temperatures.

Design Features

  • 800 HP avoids creep and stress ruptures even above 700° C (1290°) because of increased Al & Ti content.
  • Resistance to sulfurized atmospheres with commonly reduced and oxidized surroundings.
  • Good metallic durability at high temperatures over time, or long-term.


  • Seamless Pipe 1/4”- 8”
  • Welded Pipe 8” – 24”
  • Butt-Weld Fittings 1/2” – 24”
  • Flanges 1/2” – 24”
  • Bar 1/8” – 11”
  • Welded Pipe 4” – 24”
  • Pressure Fittings 1/4” – 2”
  • Plate 1/8” – 3”
  • Seamless Tube 1/8” – 1”


  • ASTM B407, B514, B366, B408, B564
  • ASME SB407, SB514, SB366, SB408, SB564

Tensile Requirements

This alloy has a tensile strength of 72.5 KSI and a yield strength of 25 KSI. Convert KSI to MPA by multiplying by 6.895.

It’s always important to find the right alloy or steel for any specific job. Different kinds of steel have different properties, but each one has the ideal characteristics for a particular task. Call us to find the right allow for your next project.

For specific questions, check out our technical guides or give us a call at 908-526-1222 today.

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Chemical Composition

C Cr Fe Ni Al Ti Al/Ti
.06-.10 19.0-23.0 39.5 30.0-35.0 .15-.60 .15-.60 .85-1.20