Incoloy 800HT is a nickel-iron-chromium alloy with good strength and excellent resistance to oxidation and carburization in high-temperature atmospheres. It also resists corrosion by many aqueous environments. Incoloy 800HT maintains a stable, austenitic structure during prolonged exposure to high temperatures. Incoloy 800HT is used for process piping, heat exchangers, carburizing equipment, heating-element sheathing and nuclear steam-generator tubing. Standard product forms are round, flats, forging stock, pipe, tube, plate, sheet, strip and wire.
Unit of Measure



N/A Incoloy®


N/A Plates


N/A 1/2 inches


N/A 0.500 inches12.7 mm

Plate Weight per Unit Area

N/A 0.15350 lbs/in²107.9211836 kg/m²

Nickel Alloy Compositions


N/A Incoloy 800HT

Basic Composition

N/A 0.015% Max. Sulphur 0.10% Carbon 0.60% Aluminum 0.60% Titanium 0.75% Max. Copper 1.0% Max. Silicon 1.20% Aluminum +Titanium 1.50% Max. Manganese 23.0% Chrominum 35.0% Nickel 39.5% Min. Iron


N/A 0.287 lbs/in³7.94 g/cm³

ASTM Specification

N/A ASME SB-409 ASTM B409 UNS N08811

Typical Mechanical Properties

Melting Temperature Range

N/A 2475 to 2525 ºF1357 to 1385 ºC

Rupture Strength (1000 h at 1200°F/650°C)

N/A 24000 psi165 MPa

Rupture Strength (1000 h at 1300°F/705°C)

N/A 15000 psi105 MPa

Rupture Strength (1000 h at 1400°F/760°C)

N/A 10000 psi70 MPa

Rupture Strength (1000 h at 1600°F/870°C)

N/A 4700 psi32 MPa

Rupture Strength (1000 h at 1800°F/980°C)

N/A 2000 psi14 MPa