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Incoloy 800 (UNS N08800 / W.Nr. 1.4876 / GB NS111, formerly 0Cr20Ni32AlTi) is an iron-nickel-chromium austenitic alloy designed for high-temperature oxidation resistance, carburization resistance, and general corrosion resistance in aqueous media. With approx. 32% Ni and 21% Cr balanced by Fe, it sits between 300-series stainless steels and high-nickel alloys like Inconel 600 or Incoloy 825. It is widely specified for heat exchangers, furnace components, petrochemical reformer piping, and nuclear steam-generator tubing where temperatures reach 600–800°C.
Chemical Composition (ASTM B409 / B407 / B408)
Values are weight percent (wt.%) per ASTM specification:
|
Element |
Min (%) |
Max (%) |
Note |
|---|---|---|---|
|
Nickel (Ni) |
30.0 |
35.0 |
Stabilizes austenite, resists Cl⁻ SCC |
|
Chromium (Cr) |
19.0 |
23.0 |
Forms Cr₂O₃ passive / oxide film |
|
Iron (Fe) |
39.5 |
Balance |
Matrix element |
|
Carbon (C) |
— |
0.10 |
Lower C variants available |
|
Aluminum (Al) |
0.15 |
0.60 |
With Ti, stabilizes structure, aids carburization resistance |
|
Titanium (Ti) |
0.15 |
0.60 |
Controls grain stability (Al+Ti typically 0.30–1.20%) |
|
Manganese (Mn) |
— |
1.50 |
— |
|
Silicon (Si) |
— |
1.00 |
— |
|
Copper (Cu) |
— |
0.75 |
— |
|
Sulfur (S) |
— |
0.015 |
— |
Mechanical & Physical Properties (Solution Annealed, Room Temp.)
Typical minimum values per ASTM B409/B407; actual mill test values may vary slightly by product form.
|
Property |
Value (Typical / Minimum) |
|---|---|
|
Tensile Strength (Rm) |
≥ 520 MPa (75 ksi); typical 550–650 MPa |
|
Yield Strength (Rp0.2) |
≥ 205 MPa (30 ksi); typical 220–280 MPa |
|
Elongation (A, in 50 mm) |
≥ 30%; typical 35–40% |
|
Hardness |
≤ 90 HRB (typical 70–85 HRB); ≤ ~150–180 HB |
|
Density |
7.94–8.00 g/cm³ (use 8.0 g/cm³ for calc.) |
|
Melting Range |
1357–1385°C (2475–2525°F) |
|
Modulus of Elasticity (RT) |
~196–200 GPa |
|
Magnetic |
Non-magnetic in annealed condition |
|
Recommended Max. Continuous Service (air) |
~870°C (1600°F); short excursion higher. For creep-design >593°C, use 800H/800HT |
International Grade Equivalents
|
Standard / Region |
Designation |
|---|---|
|
UNS (USA) |
N08800 |
|
ASTM / ASME Product Forms |
B409 (plate/sheet), B408 (bar), B407 / B163 (seamless tube), B564 (forgings) |
|
DIN / W.Nr. (Germany) |
1.4876 — X10NiCrAlTi32-20 (EN 10095) |
|
GB (China) |
NS111 (also referenced as GH1180 / 0Cr20Ni32AlTi in older docs) |
|
JIS (Japan) |
NCF 800 (JIS G4901 / G4311) |
|
BS (UK) |
NA 15 |
|
AFNOR (France) |
Z8NC32-21 / Z15CN24-13 |
|
ISO |
ISO 6207 / ISO 9723 series |
Common Applications & Notes on Selection
Heat Exchangers & Process Piping: Nitric acid coolers, phosphoric acid service, refinery overhead condensers.
Furnace & Heat Treatment: Radiant tube supports, muffle cans, carburizing furnace fixtures — benefits from Cr₂O₃ scale and Al/Ti-stabilized microstructure.
Power & Nuclear: Feedwater heater tubing (secondary side), steam generator components.
Elevated Temperature Creep Service: For designs above ~593°C where creep rupture is a governing factor, specify Incoloy 800H (N08810 / W.Nr.1.4958) with controlled C ≥0.05% and coarse grain, or 800HT (N08811 / W.Nr.1.4959) with Al+Ti ≥0.85% for optimum creep strength.
