Incoloy 800H (UNS N08810) and 800HT (UNS N08811) are enhanced versions of the standard Incoloy 800 alloy, specifically optimized for superior creep resistance and high-temperature stability. These nickel-iron-chromium alloys feature:

• Controlled carbon content (0.05-0.10% for 800H, 0.06-0.10% for 800HT)

• Titanium and aluminum additions for improved creep strength

• Higher nickel content (30-35%) compared to standard austenitic steels

• Excellent microstructural stability during long-term service

• Size Range
  Wire	0.5-7.5mm
  Rod / bar	8.0-200mm
  strip	(0.5-2.5)*(5-180)mm
  Tube	Custom made
  Plate	Custom made

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Key Properties

• Outstanding creep rupture strength at 600-900°C (1112-1652°F)

• Minimum creep rupture strength: 100 MPa at 700°C/100,000 hours

• Excellent resistance to oxidation and carburization

• Good weldability and fabricability

• Superior thermal fatigue resistance

Primary Applications

Power Generation Systems

1. Superheater and reheater tubes in coal-fired boilers

2. High-pressure steam piping systems

3. Heat recovery steam generator (HRSG) components

4. Gas turbine exhaust systems

Nuclear Power Components

1. Steam generator tubing

2. Reactor coolant system piping

3. Nuclear fuel processing equipment

4. Primary circuit auxiliary components

Petrochemical Processing

1. Steam methane reformer furnace tubes

2. Pyrolysis furnace components

3. High-temperature heat exchangers

4. Catalytic reforming system parts

Industry Trends Driving Demand

1. Power Plant Efficiency Improvements

• Global push for higher operating temperatures to improve efficiency

• Need for materials that can withstand ultra-supercritical conditions

• Retrofitting of aging power plants with advanced materials

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3. Nuclear Energy Renaissance

• Growing investment in next-generation nuclear reactors

• Demand for proven materials with nuclear qualification

• Life extension programs for existing nuclear plants

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4. Clean Energy Transition

• Role in hydrogen production infrastructure

• Applications in carbon capture systems

• Use in biomass and waste-to-energy plants

Technical Advantages Over Alternatives

• Superior creep resistance compared to standard Incoloy 800

• More cost-effective than nickel-based superalloys like Inconel 617

• Better oxidation resistance than 9Cr-1Mo ferritic steels

• More established performance history than newer alloy variants

• Compliant with ASME Boiler and Pressure Vessel Code (Section III for nuclear)

Future Outlook
The market for Incoloy 800H/800HT seamless tubes is expected to grow due to:

• Increasing global energy demand

• Focus on power plant efficiency improvements

• Nuclear power expansion in emerging markets

• Need for reliable materials in extreme service conditions

Standards Compliance

• ASTM B407/ASME SB407 (Seamless pipe and tube)

• EN 10216-5 (European standard)

• ASME Code Case N-201 (Nuclear applications)

• NACE MR0175/ISO 15156 (Sour service compliance)

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