Incoloy 800H & 800HT丨N08810 & N08811
Incoloy 800H and 800HT are nickel-iron-chromium alloys specifically engineered for outstanding creep rupture strength, oxidation resistance, and long-term structural stability at elevated temperatures.
J&A Alloy supplies Incoloy 800H & 800HT pipe, tube, plate, sheet, bar, wire, and forgings for petrochemical, power generation, and industrial furnace applications.
✔ Excellent creep strength
✔ Outstanding oxidation resistance
✔ Superior carburization resistance
✔ Excellent fabrication and weldability
Incoloy 800H & 800HT Supplier & Manufacturer
Incoloy 800H (UNS N08810) and Incoloy 800HT (UNS N08811) are modified versions of Alloy 800 with controlled carbon, aluminum and titanium contents to optimize creep and stress rupture properties at temperatures above 600°C.
Unlike standard Alloy 800, these grades provide superior long-term stability under sustained thermal loading, making them ideal for petrochemical processing, ethylene cracking furnaces, heat exchangers and power generation systems.
J&A Alloy supplies Incoloy 800H & 800HT products with complete traceability and international certifications.
Key Features of Incoloy 800H & 800HT
Excellent Creep Strength
Designed for long-term service under elevated temperatures and stresses.
Outstanding Oxidation Resistance
Resists oxidation and scaling up to approximately 1100°C.
Superior Carburization Resistance
Excellent performance in carbon-rich furnace atmospheres.
High Structural Stability
Maintains mechanical integrity during prolonged exposure.
Excellent Weldability
Can be fabricated using standard nickel alloy welding procedures.
Long Service Life
Widely used for critical thermal processing equipment.
Chemical Composition
| Element | 800H (%) | 800HT (%) |
|---|---|---|
| Nickel (Ni) | 30.0-35.0 | 30.0-35.0 |
| Chromium (Cr) | 19.0-23.0 | 19.0-23.0 |
| Iron (Fe) | Balance | Balance |
| Carbon (C) | 0.05-0.10 | 0.06-0.10 |
| Al + Ti | 0.30-1.20 | 0.85-1.20 |
| Manganese (Mn) | ≤1.50 | ≤1.50 |
| Silicon (Si) | ≤1.00 | ≤1.00 |
| Copper (Cu) | ≤0.75 | ≤0.75 |
| Sulfur (S) | ≤0.015 | ≤0.015 |
Mechanical Properties
| Property | Typical Value |
|---|---|
| Tensile Strength | ≥ 450 MPa |
| Yield Strength (0.2%) | ≥ 180 MPa |
| Elongation | ≥ 30% |
| Hardness | ≤ 85 HRB |
| Density | 7.94 g/cm³ |
| Melting Range | 1357-1385°C |
Corrosion Resistance
Incoloy 800H & 800HT provide excellent resistance to:
- Oxidation
- Carburization
- Sulfidation
- Nitriding atmospheres
- Steam environments
- Organic acids
- High-temperature corrosion
The high nickel content also provides excellent resistance to chloride stress corrosion cracking.
High Temperature Performance
Typical Service Characteristics
- Oxidation resistance up to approximately 1100°C
- Excellent creep rupture strength
- Outstanding thermal stability
- Good fatigue resistance
- Superior long-term structural integrity
Available Forms
J&A Alloy supplies Incoloy 800H & 800HT in:
- Pipe
- Tube
- Plate
- Sheet
- Coil
- Strip
- Round Bar
- Rod
- Wire
- Flanges
- Fittings
- Forgings
Custom sizes available.
Applications of Incoloy 800H & 800HT
Petrochemical Industry
- Ethylene cracking tubes
- Transfer piping
- Steam reformers
Industrial Furnaces
- Radiant tubes
- Retorts
- Furnace baskets
Power Generation
- Superheater tubing
- Heat exchangers
Chemical Processing
- Pressure vessels
- Process heaters
Heat Treatment Equipment
- Conveyor systems
- Fixtures
Incoloy 800H & 800HT vs Inconel 600
| Property | 800H / 800HT | Inconel 600 |
|---|---|---|
| UNS | N08810 / N08811 | N06600 |
| Main Alloy System | Ni-Fe-Cr | Ni-Cr |
| Creep Strength | Excellent | Good |
| Oxidation Resistance | Excellent | Excellent |
| Carburization Resistance | Excellent | Good |
| Maximum Service Temperature | ~1100°C | ~1175°C |
| Primary Applications | Petrochemical Furnaces | Chemical Processing |
| Weldability | Excellent | Excellent |
Welding & Fabrication
Incoloy 800H & 800HT exhibit excellent fabrication properties.
Recommended Welding Methods
- GTAW (TIG)
- GMAW (MIG)
- SMAW
Fabrication Notes
- Excellent hot and cold workability
- Conventional nickel alloy machining methods
- ERNiCr-3 filler metal commonly recommended
Standards & Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | N08810 / N08811 |
| Werkstoff | 1.4958 / 1.4959 |
| ASTM | B407 (Tube) |
| ASTM | B408 (Rod, Bar) |
| ASTM | B409 (Plate, Sheet, Strip) |
| ASME | SB407 / SB408 / SB409 |
| Common Trade Name | Incoloy 800H / 800HT |
Frequently Asked Questions
What is the difference between Incoloy 800H and 800HT?
800HT has tighter control of aluminum and titanium contents, providing improved creep rupture strength.
What are Incoloy 800H & 800HT used for?
They are widely used in petrochemical furnaces, steam reformers, heat exchangers and power generation equipment.
Can Incoloy 800H be welded?
Yes. It offers excellent weldability using conventional nickel alloy welding procedures.
What temperature can Incoloy 800H withstand?
It provides excellent oxidation resistance up to approximately 1100°C.
Is Incoloy 800H resistant to carburization?
Yes. It performs exceptionally well in carbon-rich furnace atmospheres.
What forms are available?
Pipe, tube, plate, sheet, bar, rod, wire, flanges, fittings, and forgings.
Why Choose J&A Alloy
✔ ASTM / ASME certified materials
✔ PMI and third-party inspection
✔ EN 10204 3.1 MTC available
✔ OEM machining capability
✔ Global export experience
✔ Fast delivery
✔ Competitive factory pricing
✔ Complete material traceability
