Seamless Incoloy 800 Pipe – High-Temperature Nickel Alloy Pipe for Oxidation and Creep Resistance
ASeamless Incoloy 800 Pipe is a high-performance nickel-iron-chromium alloy pipe designed for service in high-temperature and corrosive environments. Manufactured from a solid alloy billet through hot extrusion or precision cold drawing, seamless pipes contain no longitudinal weld seams, ensuring consistent metallurgical properties and superior structural integrity.
Incoloy Alloy 800 (UNS N08800 / EN 1.4876) is an austenitic nickel-iron-chromium alloy known for its excellent oxidation resistance, carburization resistance, and high-temperature strength.
The carefully balanced chemical composition of nickel, chromium, and iron provides long-term metallurgical stability during continuous exposure to temperatures up to 1100°F (593°C). As a result, Alloy 800 seamless pipes are widely used in thermal processing equipment, petrochemical plants, and power generation systems where both mechanical strength and corrosion resistance are required.
Size Range: OD 6–457 mm · WT 0.5–45 mm
Key Technical Advantages of Incoloy 800 Seamless Pipe
Using Seamless Incoloy 800 Pipe (UNS N08800) in high-temperature systems offers several important engineering advantages.
Excellent Creep and Rupture Strength
Alloy 800 maintains high mechanical strength and resistance to creep deformation under prolonged exposure to high stress and elevated temperatures, making it suitable for critical thermal applications.
Outstanding Oxidation and Carburization Resistance
Thehigh chromium and nickel content forms a stable protective oxide layer on the material surface, providing resistance to oxidation, scaling, and carburization in industrial furnace atmospheres.
Resistance to Aqueous Corrosion
Although primarily designed for high-temperature environments, Incoloy 800 alloy also provides moderate resistance to aqueous corrosion and chloride-induced stress corrosion cracking (SCC).
Excellent Thermal Fatigue Resistance
Theseamless pipe structure eliminates weld zones, which are often susceptible to thermal fatigue. This allows the pipe to withstand repeated thermal cycling without cracking or mechanical degradation.
Good Fabricability and Weldability
Alloy 800 seamless tubing demonstrates excellent fabrication characteristics, including compatibility with standard welding methods such as GTAW (TIG) and GMAW (MIG), with strong resistance to hot cracking.
Product Specifications and Data
To provide a comprehensive overview of this high-performance material, here are the detailed technical specifications and performance data for Incoloy 800.
Equivalent Grade
| UNS | Common grade name | EN material number | EN steel name | JIS grade | GB/T grade |
|---|---|---|---|---|---|
| N08800 | Incoloy 800 | 1.4876 | X10NiCrAlTi32-21 | NCF800 | NS1101 / NS111 (legacy) |
Grade correspondence does not make ASTM, ASME, EN, JIS and GB delivery requirements interchangeable. Confirm chemistry, heat treatment, mechanical properties, dimensions, testing and certification against the purchase specification. See the grade designation index.
Chemical Composition
The composition of Incoloy 800 is carefully balanced to achieve its superior high-temperature strength and oxidation resistance.
| Grade | Ni | Cu | Fe | Mn | C | Si | S | Cr | Al | Ti | P | Other |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 800 | 30.00-35.00 | ≤0.75 | ≥39.50 | ≤1.50 | ≤0.10 | ≤1.00 | ≤0.015 | 19.00-23.00 | 0.15-0.60 | 0.15-0.60 | ≤0.045 | – |
| 800H | 30.00-35.00 | ≤0.75 | ≥39.5 | ≤1.50 | 0.05-0.10 | ≤1.00 | ≤0.015 | 19.00-23.00 | 0.15-0.60 | 0.15-0.60 | ≤0.045 | – |
| 800HT | 30.00-35.00 | ≤0.75 | ≥39.5 | ≤1.50 | 0.06-0.10 | ≤1.00 | ≤0.015 | 19.00-23.00 | 0.25-0.60 | 0.25-0.60 | ≤0.045 | AL+Ti=0.85-1.20 |
Typical Mechanical Properties
Incoloy 800 is specifically designed to maintain its strength and shape in high-stress, high-temperature environments.
| Tensile Strength | Yield Strength | Elongation | Hardness |
|---|---|---|---|
| ≥ 520 MPa | ≥ 205 MPa | ≥ 30% | Not an acceptance limit in ASTM B407 |
Typical Physical Properties
These physical properties highlight the material’s ability to perform reliably under a wide range of conditions.
| Density | Melting Point | Thermal Expansion | Thermal Conductivity | Modulus of Elasticity | Electrical Resistivity |
|---|---|---|---|---|---|
| 7.94 g/cm³ | 1357 – 1385 °C approx. | 14.4 µm/m·°C (20-100°C) | 11.5 W/m·K (20°C) | 196 GPa | 0.989 µΩ·m (20°C) |
Size Tolerance Chart (mm)
Cold-Finished Pipes and Tubes:
| Specified/Calculated Nominal OD (Inches) | Permissible Variation (Inches) | Specified/Calculated Nominal OD (mm) | Permissible Variation (mm) |
| 0.500 to 5⁄8, excl. | ±0.005 | 12.7 to 15.8, excl. | ±0.127 |
| 5⁄8 to 1 1⁄2, incl. | ±0.0075 | 15.8 to 38.1, incl. | ±0.190 |
| Over 1 1⁄2 to 3 1⁄2, incl. | ±0.010 | Over 38.1 to 88.9, incl. | ±0.254 |
| Over 3 1⁄2 to 4 1⁄2, incl. | ±0.015 | Over 88.9 to 114.3, incl. | ±0.381 |
| Over 4 1⁄2 to 6, incl. | ±0.020 | Over 114.3 to 152.4, incl. | ±0.508 |
| Over 6 to 6 5⁄8, incl. | ±0.025 | Over 152.4 to 168.3, incl. | ±0.635 |
| Specified/Calculated Nominal OD (Inches) | Permissible Variation (Inches) | Specified/Calculated Nominal OD (mm) | Permissible Variation (mm) |
| 2 1⁄2 to 5 1⁄2, excl. | ±0.031 | 63.5 to 139.7, excl. | ±0.787 |
| 5 1⁄2 to 9 1⁄4, incl. | ±0.047 | 139.7 to 234.9, incl. | ±1.19 |
| Condition | Specified/Calculated Nominal OD (Inches) | Permissible Variation (Wall Thickness) |
| Cold-Finished | 0.500 to 5⁄8, excl. | ±15.0% |
| 5⁄8 to 4 1⁄2, incl. | ±10.0% | |
| Over 4 1⁄2 to 6 5⁄8, incl. | ±12.5% | |
| Hot-Finished | 2 1⁄2 to 9 1⁄4, incl. | ±12.5% |
Typical Applications of Alloy 800 Seamless Pipe
Due to its excellent performance in high-temperature environments, Incoloy 800 seamless pipes are widely used in industries requiring thermal stability and corrosion resistance.
Petrochemical and Chemical Processing
- Heat exchanger tubing
- Furnace components
- Process piping systems
- Burner assemblies
Power Generation Industry
- Superheater and reheater tubing
- High-temperature boiler components
- Nuclear and fossil fuel power plant systems
Industrial Heat Treatment Equipment
- Radiant tubes
- Retorts and muffles
- Heating elements and furnace piping
Waste Incineration and Environmental Systems
- Combustion chamber components
- Flue gas treatment piping
- High-temperature corrosion-resistant structures
Quality Assurance and International Standards
All Seamless Incoloy 800 Pipes are manufactured and tested in strict accordance with ASTM B407 / ASME SB407 and relevant international quality standards.
| Certification & Test | Technical Description |
|---|---|
| Material Test Certificates | Fully compliant with EN 10204 3.1 / 3.2 certification |
| Alloy Verification | 100% Positive Material Identification (PMI) using XRF or OES analysis |
| Non-Destructive Testing | Ultrasonic Testing (UT) and Eddy Current Testing (ECT) according to ASTM E213 |
| Hydrostatic Testing | Pressure testing to verify structural integrity and leak-free performance |
| Dimensional Inspection | Precision measurement of OD, wall thickness (WT), length tolerance, and surface roughness (Ra) |
| Metallurgical Analysis | Solution annealing records, grain size evaluation, and mechanical tensile testing |
Frequently Asked Questions
What sizes are available for Incoloy 800 seamless pipe?
Continuous supply covers OD 6–457 mm and WT 0.5–45 mm. Requirements outside this range are reviewed against mill capability on request.
Which specification governs Incoloy 800 seamless pipe?
ASTM B407 / ASME SB407 is the governing seamless specification for Incoloy 800 pipe; the edition in force at order time is stated on the quotation and purchase order.
What inspection documents are provided?
Each order is documented with a mill test certificate stating heat chemistry and mechanical test results. EN 10204 3.1 certification, hydrostatic testing, eddy-current or ultrasonic inspection and PMI are performed when specified in the purchase order.
Technical review: page data reviewed by the Xinzhe technical desk on 2026-09-27. Property values are typical reference data compiled from Special Metals Corporation alloy data sheets and the governing ASTM specifications; they are not acceptance guarantees unless stated in the purchase order. "Incoloy" is a trademark of Special Metals Corporation, used here to identify the alloy family only.
Ready to Request a Quotation?
Send the NPS and schedule (or actual OD and wall), quantity, length, end finish and the inspection items you need as acceptance criteria — you will get a written quotation stating the specification and edition, delivery condition, documents included and lead time.
