Incoloy 800HT: Complete Properties & Application Guide

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Overview

Incoloy 800HT (UNS N08811 / W.Nr. 1.4959) is a further modification of 800H with controlled carbon, aluminum, and titanium additions for superior creep and rupture strength above 800°C. The combined Al+Ti content is restricted to 0.85-1.20% for optimal performance.

Chemical Composition

The chemical composition of Incoloy 800HT is carefully controlled to achieve its unique combination of properties and performance characteristics.

Element	Min %	Max %
Nickel (Ni)	30.0	35.0
Iron (Fe)	39.5	Balance
Chromium (Cr)	19.0	23.0
Carbon (C)	0.06	0.10
Aluminum+Titanium (Al+Ti)	0.85	1.20
Aluminum (Al)	0.25	0.60
Titanium (Ti)	0.25	0.60
Manganese (Mn)	—	1.5

Mechanical Properties at Room Temperature

The mechanical properties of Incoloy 800HT vary depending on product form and heat treatment condition. The data below represents typical values for solution-annealed material.

Property	Value
Tensile Strength	450 MPa
Yield Strength (0.2% offset)	170 MPa
Elongation in 2 inches	50%
Density	7.94 g/cm3
Melting Point	1385 °C
Max Service Temperature	980 °C

Corrosion Resistance

Excellent resistance to oxidation and carburization at elevated temperatures. Superior performance in steam, hydrogen, and hydrocarbon environments. The controlled chemistry provides consistent long-term performance in high-temperature applications.

Applications

The unique combination of properties makes Incoloy 800HT suitable for a wide range of demanding applications:

• Steam Generation: Superheater and reheater tubing for high-pressure boilers.
• Refining: Furnace tubes and catalyst transfer lines in refineries.
• Chemical Processing: Ethylene pyrolysis coils and reformer tubes.
• Power Generation: Heat exchangers and piping in advanced power plants.
• Nuclear: Steam generator components and nuclear fuel cladding.

Available Product Forms

Hangbo Alloy Group manufactures and supplies Incoloy 800HT in the following product forms, conforming to ASTM, AMS, and ASME specifications:

• Round Bars: Diameters from 6 mm to 300 mm, hot-finished or cold-drawn, solution annealed.
• Seamless Tubes & Pipes: Sizes from 6 mm OD to 219 mm OD, various wall thicknesses.
• Plates & Sheets: Thicknesses from 0.5 mm to 50 mm, hot-rolled or cold-rolled.
• Forgings: Custom flanges, rings, discs, and complex shapes per customer drawing.
• Welding Wire: Diameters 0.8 mm to 5.0 mm, precision-wound coils and spools.

Related Standards

Standard	Description
ASTM B407	Seamless Pipe and Tube
ASTM B409	Plate, Sheet, and Strip
ASTM B408	Bar and Rod
ASTM B564	Forgings
ASME SB-407	Pressure Vessel Code
ASTM B366	Fittings

Contact Us for Incoloy 800HT

Hangbo Alloy Group maintains extensive inventory of Incoloy 800HT in all standard product forms. We can provide mill test certificates, third-party inspection reports (SGS, TUV), and custom processing services.

For quotations, material certifications, or technical consultation, contact our sales team or call +86-136-1165-6360. We typically respond within 10 minutes.