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Alloy 800HT Pipes

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Alloy 800HT Strips

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Alloy 800HT Plates

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Alloy 800HT Bars

About Alloy 800HT

alloy 800ht

What is Alloy 800HT?

Alloy 800HT also referred to as the UNS N08811/W.Nr. 1.4959 alloy.

Alloy 800HT is an iron-nickel-chromium alloy having the same basic composition as alloy 800, with significantly higher creep rupture strength.

Alloy 800HT has a restricted chemistry, within the limits of alloy 800H, and requires a heat treatment of 2100°F (1149°C) minimum. The carbon is 0.06 to 0.10% (alloy 800H is 0.05 to 0.10%), the Al + Ti is 0.85 to 1.20% (alloy 800H is 0.30 to 1.20% Al + Ti).

Alloys 800H and 800HT are available in all standard mill forms including rod, bar, plate, sheet, strip, shapes, and tubular products.

Alloy 800HT Standards


-Seamless Pipe & Tube


-Welded Pipe & Tube


-Rod & Bar


-Plate, Sheet, Strip & Foil

Alloy 800HT Chemical Composition

alloy 800ht chemical composition

Alloy 800HT Data Sheet

Alloy 800HT Equivalent Grades

Alloy 800HT1.4959N08811

Alloy 800HT Mechanical Properties

DensityMelting PointTensile StrengthYield Strength (0.2%Offset)Elongation
7.94 g/cm31385 °C (2525 °F)250-550Mpa90-150Mpa45% – 15%

Alloy 800HT Physical Properties

Melting RangeSpecific Heat, 20°C (J/(g.K)) Magnetic Permeability (20°C)Thermal Conductivity, 20°C (W/(m.K))Curie Temperature (°C)
1385 °C (2525 °F)460<1.00911.5-115

Alloy 800HT Applications

Alloy 800HT Related Resources

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