ASTM B407 UNS N08800, UNS N08801, UNS N08810, UNS N08811 Nickel Alloy Steel Cold Drawn Tube
ASTM B407 UNS N08810, Incoloy 800, is a nickel-iron-chromium high-temperature alloy seamless pipe designed for extremely high temperatures and corrosive environments. Its chemical composition is based on nickel, chromium, and iron, with trace elements such as aluminum and titanium added to enhance oxidation and carburization resistance.
This alloy maintains excellent oxidation resistance, carburization resistance, and mechanical strength at temperatures up to 1100°C, and exhibits good resistance to sulfide and chloride stress corrosion cracking.
N08810 pipe is widely used in critical equipment such as petrochemical cracking furnaces, ethylene cracking tubes, nuclear power heat exchangers, and thermal power boilers, particularly in high-temperature oxidizing, carburizing, or sulfiding environments.
Compared to traditional stainless steel, it offers superior high-temperature strength, thermal fatigue resistance, and corrosion resistance; and at a lower cost than high-nickel alloys, it is an ideal choice for balancing performance and cost.
N08810 pipe provides long-term, stable service in environments containing chloride ions, sulfides, or acidic media.
Description
INCOLOY alloy 800 is an alloy of nickel, iron and chromium. The alloy is capable of remaining stable and maintaining its austenitic structure even after long time exposures to high temperatures. Other characteristics of the alloy are good strength, and high resistance to oxidizing, reducing and aqueous environments. The standard forms in which this alloy is available are round, flats, forging stock, tube, plate, sheet, wire and strip.
Incoloy 800 Alloy Steel Seamless Tube Chemical Composition
| Element |
Content (%) |
| Iron, Fe |
≥39.5 |
| Nickel, Ni |
30-35 |
| Chromium, Cr |
19-23 |
| Manganese, Mn |
≤1.5 |
| Others |
Remainder |
Incoloy 800 Alloy Steel Seamless Tube Physical Properties
| Properties |
Metric |
Imperial |
| Density |
7.94 gm/cm3 |
0.287 lb/in3 |
Incoloy 800 Alloy Steel Seamless Tube Mechanical Properties
| Properties |
Metric |
Imperial |
| Tensile strength(annealed) |
600 MPa |
87 ksi |
| Yield strength(annealed) |
275 MPa |
39.9 ksi |
| Elongation at Break |
45% |
45% |
Hot working
| Incoloy Alloy 800 |
up to about 1500 Deg F (816°C) |
| Incoloy Alloy 800H |
1100 Deg F (593°C) to 1800°F (982°C) |
Applications of ASTM B407 UNS N08810 Tubes
1. Petrochemical & Refining
High nickel (30–35%) and chromium (19–23%) content prevent scale formation and embrittlement in hydrocarbon processing.
2. Power Generation,Superheaters/Reheaters Heat Recovery Steam Generators (HRSGs)
3. Chemical Processin Catalytic Reactors Waste Incineration Systems
4. Thermal Processing & Heat Treatment Annealing Furnaces
5. Oil & Gas (Upstream/Downstream)
6. Aerospace: Exhaust systems and afterburners requiring thermal fatigue resistance.
7.Cryogenics: Low-temperature applications (down to -200°C) due to retained toughness.
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