Incoloy 800H: Complete Properties & Application Guide

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Overview

Incoloy 800H (UNS N08810 / W.Nr. 1.4958) is a controlled-carbon version of Incoloy 800 with improved creep and rupture properties at elevated temperatures. The higher carbon content (0.05-0.10%) provides better high-temperature strength through carbide precipitation strengthening.

Chemical Composition

The chemical composition of Incoloy 800H 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)	0.05	0.10
Aluminum (Al)	0.15	0.60
Titanium (Ti)	0.15	0.60
Manganese (Mn)	—	1.5
Silicon (Si)	—	1.0

Mechanical Properties at Room Temperature

The mechanical properties of Incoloy 800H 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, carburization, and sulfidation at elevated temperatures. Good resistance to steam and steam-air mixtures. The alloy performs well in high-temperature hydrogen environments, making it suitable for petrochemical applications.

Applications

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

• Steam Generation: Superheater and reheater tubing in power boilers.
• Hydrocarbon Processing: Catalyst tubing and furnace tubes in refineries.
• Chemical Processing: High-temperature reaction vessels and heat exchangers.
• Nuclear Power: Steam generator tubing and heat exchanger components.
• Heat Treatment: Muffles and furnace components for continuous operation.

Available Product Forms

Hangbo Alloy Group manufactures and supplies Incoloy 800H 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 800H

Hangbo Alloy Group maintains extensive inventory of Incoloy 800H 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.