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Incoloy 800H/HT

Incoloy 800H/HT

Boasting high creep-rupture strength, INCOLOY Alloy 800HT is a nickel-iron-chromium alloy modified from the original alloy 800. Through proper mechanical and thermal processing, the alloy enables engineers to incorporate higher design stresses than what is possible with conventional alloy.

Equivalent grades

• Incoloy 800H/HT
• UNS N08810
• UNS N08811
• W.NR. 1.4959
• DIN 1.4958

Chemical Composition Reference


Physical Property Reference

• Density: 7.94 g/cm³

• Tensile Strength: 560 MPa

• Yield Strength: 250 MPa

• Melting Point: 1357-1385 ℃

• Yield Strength: 250 MPa

• Tensile Strength: 560 MPa

• Elongation at break: 45%

Stock & Dimensions

Our warehouse has a large number of stock to provide you with a variety of products in different sizes, and can also customize the size according to your needs.
• Bar: 0.5~600mm Diameter
• Coil: 0.5~150mm Thick
• Plate: 0.5~200mm Thick
• Pipe: 6~630mm External Diameter; 0.5~40mm Wall Tick
• Available in specific sizes

Product Forms

We provide you with a variety of product forms, including but not limited to:
• Bar/Rod
• Pipe/Tube
• Coil/Strip
• Plate/Sheet/Circle
• Wire
• Fitting (Flange, Elbow, Tee...)
• Customize

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Incoloy 800H/HT

Essential details
Alloy 800H/800HT are two individual solid solution strengthened, iron-nickel-chromium alloys. They are typically offered as one, dual certified alloy, meeting the chemical composition requirements of both alloys.

The principle difference between alloys 800H and 800HT® is the restricted aluminum and titanium content in 800HT, which results in higher creep and stress rupture properties.

Both alloy 800H and 800HT are generally considered to be superior to the base alloy 800 (UNS N08800) because of greater creep and stress rupture properties and a more restrictive C wt% range. Alloy 800H limits the C wt% from just 0.1% max in base alloy 800 to a 0.5% to 0.1% range. Alloy 800HT further controls this by limiting the C wt% to 0.6% to 0.1%. There are also limitations on the grain size for alloy 800 H/HT that are not in place for alloy 800.


- Chemical and Petrochemical Processing—process equipment for the production of ethylene, ethylene dichloride, acetic anhydride, ketene, nitric acid and oxy-alcohol

- Petroleum Refining—steam/hydrocarbon reformers and hydrodealkylation units

- Power Generation—steam super-heaters and high temperature heat exchangers in gas-cooled nuclear reactors, heat exchangers and piping systems in coal-fired power plants

- Thermal Processing Fixtures—radiant tubes, muffles, retorts and fixtures for heat-treating furnaces

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