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Incoloy Alloy 800HT Pipes & Tubes

Material Description

UNS N08811

Chemical Composition, %












39.5 min


.75 max




1.5 max

.015 max

1.0 max

Incoloy alloy 800HT is nickel-iron-chromium alloys with good strength and excellent resistance to oxidation and carburization in high-temperature exposure. The nickel steel alloy is identical except for the higher level of carbon in alloy 800H, and the addition of up to 1.20 percent aluminum and titanium in alloy 800HT. Incoloy alloy 800HT has further modifications to the combined titanium and aluminum levels (.85-1.20%) to ensure optimum high temperature properties. The nickel alloy is dual certified (800H/HT) and combines the properties of both forms. Incoloy 800H/HT alloy was intended for high temperature structural applications. The nickel content makes the alloys highly resistant to both chloride stress-corrosion cracking and to embrittlement from precipitation of sigma phase. The general corrosion resistance is excellent. In the solution annealed condition, alloys 800HT has superior creep and stress rupture properties.

Incoloy alloy 800HT is normally used in temperatures above 1100° F where resistance to creep and rupture is required. The chemical balance allows the nickel steel alloy to exhibit excellent resistance to carburization, oxidation and nitriding atmospheres. Incoloy alloy 800HT will not become embrittled even after long periods of usage in the 1200-1600° F range where many stainless steels become brittle. Excellent cold forming characteristics typically associated with the nickel-chromium alloys are exhibited with 800HT. When cold formed extensively the grain size produces a visibly undulated surface called “orange peel”. Incoloy 800HT can be welded by the common techniques used on stainless steels.


● High temperature strength

● High creep rupture strength

● Resistant to oxidation and carburization in high temperature environments

● Good corrosion resistance in many acidic environments

● Good resistance to many sulfur-containing atmospheres


● Tubing has exposure to corrosive environments and high temperatures such as heat treating equipment, chemical and petrochemical processing, nuclear power plants and the paper pulp industry.

● Heat-treating equipment such as baskets, trays, and fixtures

● Heat exchanger tubing and piping system for Chemical and petrochemical processing industries in nitric acid media especially where resistance to chloride stress-corrosion cracking is required.

● Power plants use them for super-heater tubing and re-heater tubing

Seamless Tube Information:

Specification: ASTM B-163 / ASME SB-163, ASTM B-407 / ASME SB-407

Outside Diameter: 6.0-114 mm

Wall Thickness: 0.5-15 mm

Length: Max.24000mm (the maximum length is for the scope of special diameters and walls)

Other sizes are on the request