Excellent resistance to high-temperature oxidation and carburization in extreme thermal environments.
Superior creep and rupture strength for sustained performance under prolonged stress.
Outstanding resistance to chloride stress-corrosion cracking in aggressive aqueous conditions.
Excellent structural stability with minimal sensitization during welding and thermal cycling.
Incoloy 800 is a nickel-iron-chromium alloy designed for high-temperature strength and excellent resistance to oxidation and carburization, As a professional Incoloy 800 supplier, Hengyi Metal provides plates, pipes, tubes and bars for industrial and high-temperature applications worldwide.
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Email: sales@hengyimetal.com
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Features: Incoloy800/800H/800HT has a restricted carbon content range of 0.05 to 0.10%, which is in the upper portion of that of Incoloy 800, and is annealed at 1149 to 1177℃ (Incoloy 800 is annealed at 983 to 1038℃). These differences impart it to have higher stress rupture and creep properties than Incoloy 800
Incoloy800/800H/800HT tubes and pipes are engineered for demanding applications in petrochemical, power generation, and heat-treating industries. This austenitic nickel-iron-chromium alloy delivers reliable performance in superheater tubes, furnace components, and chemical processing systems. With exceptional formability and consistent wall uniformity, it enables efficient fabrication while meeting stringent safety and quality standards for critical service environments
Applications: Chemical and petrochemical process piping, high temperature heat exchangers, furnace components, carburizing equipment, heating-element sheathing, and nuclear power steam superheating tubing.
Note: Incoloy is a registered trademark of the Special Metals Corporation group of companies
Learn more about Incoloy 800 properties
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| Item | Details |
|---|---|
| Material Grades | UNS N08800 (800), UNS N08810 (800H), UNS N08811 (800HT) |
| Product Form | Seamless Tube / Seamless Pipe / Welded Tube (as required) |
| Outer Diameter | 6mm – 219mm (custom sizes available upon request) |
| Wall Thickness | 0.5mm – 20mm (customizable) |
| Length | Random length, fixed length, or custom length |
| Manufacturing Standards | ASTM B163, ASTM B407, ASTM B514, ASME SB163, ASME SB407, DIN, EN, or customer-specified standards |
Key Differentiators: 800 vs 800H vs 800HT
Understanding the differences between the three grades is essential for selecting the right material for your application:
| Grade | UNS | Carbon Content | Key Characteristics | Best Suited For |
|---|---|---|---|---|
| Incoloy800 | N08800 | ≤ 0.10% | General-purpose alloy with good high-temperature strength and corrosion resistance | Applications below 600°C, heat exchangers, general piping |
| Incoloy800H | N08810 | 0.05–0.10% | Controlled carbon content + solution annealed; higher creep rupture strength | Elevated temperature service above 600°C, furnace components |
| Incoloy800HT | N08811 | 0.06–0.10% | Controlled carbon + Al+Ti (0.85–1.20%); highest creep rupture strength | Extreme high-temperature environments, superheater tubes, radiant tubes |
Chemical Composition (Weight %)
| Element | Incoloy800 (N08800) | Incoloy800H (N08810) | Incoloy800HT (N08811) |
|---|---|---|---|
| Nickel (Ni) | 30.0 – 35.0 | 30.0 – 35.0 | 30.0 – 35.0 |
| Chromium (Cr) | 19.0 – 23.0 | 19.0 – 23.0 | 19.0 – 23.0 |
| Iron (Fe) | Balance | Balance | Balance |
| Carbon (C) | ≤ 0.10 | 0.05 – 0.10 | 0.06 – 0.10 |
| Aluminum (Al) | 0.15 – 0.60 | 0.15 – 0.60 | 0.15 – 0.60 |
| Titanium (Ti) | 0.15 – 0.60 | 0.15 – 0.60 | 0.15 – 0.60 |
| Aluminum + Titanium | — | — | 0.85 – 1.20 |
| Silicon (Si) | ≤ 1.00 | ≤ 1.00 | ≤ 1.00 |
| Manganese (Mn) | ≤ 1.50 | ≤ 1.50 | ≤ 1.50 |
| Sulfur (S) | ≤ 0.015 | ≤ 0.015 | ≤ 0.015 |
Mechanical Properties (Typical Values)
| Property | Incoloy800 | Incoloy800H | Incoloy800HT |
|---|---|---|---|
| Tensile Strength (MPa) | ≥ 520 | ≥ 520 | ≥ 520 |
| Yield Strength 0.2% (MPa) | ≥ 205 | ≥ 205 | ≥ 205 |
| Elongation (%) | ≥ 30 | ≥ 30 | ≥ 30 |
| Hardness (HB) | ≤ 200 | ≤ 200 | ≤ 200 |
| Grain Size (ASTM) | — | 5 or coarser | 5 or coarser |
Note: 800H and 800HT are solution annealed at controlled temperatures to achieve coarse grain structure, which significantly enhances creep rupture strength at elevated temperatures.
Physical Properties
| Property | Value (Typical) |
|---|---|
| Density | 7.94 g/cm³ (0.287 lb/in³) |
| Melting Range | 1350 – 1400°C (2460 – 2550°F) |
| Thermal Conductivity (100°C) | 11.5 W/m·K |
| Coefficient of Expansion (20–1000°C) | 17.5 × 10⁻⁶ /K |
| Electrical Resistivity | 1.03 µΩ·m |
Form | ASTM |
Rod and bar | B 408 |
Plate, sheet and strip | A 240, A 480, B 409, B 906 |
Seamless pipe and tube | B 407, B 829 |
Welded pipe | B 514, B 775 |
Welded tube | B 515, B 751 |
Welding fitting | B 366 |
Forging | B 564 |
Alloy | ASTM | DIN | BS | AFNOR | GB | |
|---|---|---|---|---|---|---|
New grades | Old grades | |||||
| Incoloy 800 | UNS N08800 | 1.4876 / X10NiCrAlTi3220 | NA15 | Z8NC32.21 | NS1101 | NS111 |
| Incoloy 800H | UNS N08810 | 1.4958 / X5 NiCrAlTi 31-20 | NA 15 (H) | NS1102 | NS112 | |
| Incoloy 800HT | UNS N08811 | 1.4959 / X 8 NiCrAlTi 32-21 | ||||
| Incoloy 825 | UNS N08825 | 2.4858 / NiCr21Mo | NA16 | NC21FeDu | NS1402 | NS142 |
| Incoloy 925 | UNS N09925 | 1.4529 / X1NiCrMoCu | ||||
| Incoloy 926 | UNS N08926 | 1.4529 / X1NiCrMoCu | X1NiCrMoCu | X1NiCrMoCu | ||
| Incoloy 901 | UNS N09901 | 2.4662 | ||||
| Incoloy 330 | UNS N08830 | |||||
