Incoloy 800HT | UNS N08811 | 1.4959
- ASTM B407 / ASME SB407
- ASTM B163 / ASME SB163
- ASTM B514 / ASME SB514
- ASTM B366 / ASME SB366
UNS N08811 is a nickel-iron-chromium superalloy commonly known as Incoloy 800HT or Alloy 800HT.It is a high-temperature corrosion-resistant material specifically engineered to deliver exceptional creep and fracture strength at elevated temperatures.
UNS N08811 resists oxidation,carburization,and nitriding atmospheres and is designed to withstand temperatures up to 982°C (1800°F).Compared to Incoloy 800 and 800H,800HT offers higher creep resistance and stress rupture strength.Its high nickel and chromium content provides excellent corrosion resistance in diverse corrosive environments.Solution annealed to achieve a coarser grain structure (ASTM 5 or coarser),enhancing high-temperature performance.
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Available UNS N08811 Pipe & Fitting Types
Pipe Forms
- Seamless Tubes/Pipes:
Available in various outer diameters (6 mm to 325 mm) and wall thicknesses (SCH 10S, SCH 40S, SCH 80S, etc.).
Outer Diameter: 6 mm – 325 mm (1/8“ to 12”); Wall Thickness: 0.89 mm – 35 mm.Customization is acceptable. - Welded Tubes:
While slightly less strong,they offer greater cost-effectiveness compared to seamless tubes. - Special Specifications:
KAYSUNS also provides square,rectangular,U-shaped,coiled tubes,heat exchanger tubes,and more.
Fitting Types
- Welded Pipe Fittings:
The most common fittings include 90° elbows,45° elbows,equal-diameter tees and reducing tees,concentric reducers and eccentric reducers,pipe caps,and stub pipes.
UNS N08811 Pipe & Fitting Surface Treatment
Pipe Surface Finishes
- Pickling and Annealing
- Bright Annealing
- Polishing
- Sandblasting/Shot Blasting
Fitting Types
- Pickling
- Sandblasting
- Surface Passivation
- Ends Oiled or Sealed With Wax
Although end oiling and wax sealing are not considered “surface treatment,” they are typically applied with oil and covered with plastic dust caps to prevent oxidation of the bevel during transportation.
Chemical Composition of UNS N08811
| Element | Ni | Cr | Fe | C | Al+Ti | Mn | Si |
|---|---|---|---|---|---|---|---|
| Weight (%) | 30.0 – 35.0 | 19.0 – 23.0 | Balance | 0.06 – 0.10 | 0.85 – 1.20 | ≤1.50 | ≤1.00 |
Mechanical Properties of UNS N08811
| Property | Tensile Strength | Yield Strength | Elongation | Hardness | Density | Melting Range |
|---|---|---|---|---|---|---|
| Value (Typical) | ≥550 MPa (80 ksi) | ≥240 MPa (35 ksi) | ≥30 | ≤190 | 7.94g/cm³ | 1357−1430℃ |
UNS N08811 Pipe QA & Testing
For pipes conforming to ASTM B407 / ASME SB407 (seamless pipe) or ASTM B514 (welded pipe) standards,Kaysuns ensures their quality through the following tests.
Chemical Analysis
Spectral analysis ensures strict compliance with chemical composition standards.
Mechanical Testing
- Tensile Testing:
Measures tensile strength,yield strength,and elongation. - Hardness Testing:
Ensures materials meet Rockwell or Brinell hardness standards.
Creep Testing
Although not required for every batch,our factory must still provide laboratory data to demonstrate its stability at high temperatures.
Non-Destructive Testing
- Hydrostatic Test:
Calculate pressure according to standards to verify pipe wall integrity. - Eddy Current or Ultrasonic Testing (UT):
Detect internal defects in pipe walls.
Grain Size Determination
Incoloy 800HT must undergo high-temperature solution treatment to achieve a grain size of ASTM No. 5 or coarser to ensure creep strength.
UNS N08811 Fitting QA & Testing
For the ASTM B366 / ASME SB366 (Butt Weld/Formed Pipe Fittings) standard,Kaysuns performs the following tests.
Dimensional Inspection
Strictly inspect the outside diameter,wall thickness,bevel angle,and distance from center to end face in accordance with ASME B16.9.
Heat Treatment
Ensure that the pipe fittings undergo solution annealing at temperatures exceeding 1150°C (2100°F) after forming.
Surface Examination
- Liquid Penetrant Inspection (LPI/PT):
Focuses on detecting microcracks in the curvature and weld areas of elbows and tees. - Magnetic Particle Inspection (MPI):
Detects surface and subsurface defects.
Radiography - RT
For welded pipe fittings requiring 100% weld inspection (e.g., X-ray grade tees),X-ray testing must be performed.
Material Identification
100% material verification using handheld spectrometers to prevent material mix-ups.
UNS N08811 Pipe & Fitting Applications
- Petrochemical & Refining
- Power Generation
- Heat Treating & Furnaces
- Chemical Processing
- Environmental & Aerospace
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