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Incoloy 800HT Seamless Pipe

Incoloy 800HT |UNS N08811|1.4959 Seamless Pipe

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Incoloy 800HT Seamless Pipe (UNS N08811) is a high-performance nickel-iron-chromium alloy pipe specifically engineered for elevated temperature and high-stress applications. With controlled carbon, aluminum, and titanium content, Incoloy 800HT offers excellent creep rupture strength, oxidation resistance, carburization resistance, and structural stability in extreme heat and corrosive processing environments.

Tengqi, a professional Incoloy 800HT seamless pipe manufacturer and supplier based in Fujian, China, specializes in the production of high-quality nickel alloy seamless pipes using advanced hot extrusion and precision cold-finishing processes. We supply Incoloy 800HT seamless pipes in a wide range of outer diameters, wall thicknesses, and customized cut-to-length specifications to meet diverse industrial project requirements.

Our Incoloy 800HT seamless pipes are manufactured in compliance with international standards such as ASTM B407 and ASME SB407, ensuring consistent mechanical properties, dimensional accuracy, and long-term reliability under high-temperature service conditions. Each pipe undergoes comprehensive quality inspection, including hydrostatic testing, ultrasonic testing, eddy current testing, and PMI (Positive Material Identification), to guarantee performance integrity.

Widely used in petrochemical processing, heat treatment equipment, power generation plants, furnace components, and high-temperature piping systems, our Incoloy 800HT seamless pipes deliver superior strength and corrosion resistance in demanding environments.

With strict quality control, competitive pricing, and dependable global delivery, Tengqi has established a strong reputation as a trusted supplier of high-temperature nickel alloy seamless pipes worldwide.

SeamlessIncoloy 800HT Pipe (Incoloy800HT / UNS N08811 / W.Nr. 1.4959) is the Incoloy 800H variant with enhanced creep and stress-rupture properties above 1000 °C. Manufactured by Tengqi in Fujian, China, every heat is fully traceable, hydro-tested and available with third-party inspection (SGS / BV / TUV) on request.

Product Specifications

  • ASTM B161 / B163 — Seamless Tube & Pipe
  • ASTM B165 / B167 — Seamless Pipe
  • ASTM B407 / B423 — Seamless Pipe & Tube
  • ASTM B622 — Seamless Pipe & Tube
  • ASTM B829 — General Requirements
  • Finishing: solution annealed, pickled & polished; bright annealed available on request

Size Range

Outside Diameter (OD)Wall ThicknessLength
6 mm – 1016 mm (1/4"– 40")0.5 mm – 65 mm6 m / 12 m, or as required

Chemical Composition

Incoloy800HT (UNS N08811) — Composition %

UNSCMnPSSiCrNiCuTiAlFe
N088110.06 – 0.10≤ 1.5≤ 0.045≤ 0.015≤ 1.019.0 – 23.030.0 – 35.0≤ 0.750.25 – 0.600.25 – 0.60≥ 39.5

Mechanical Properties

PropertyValue
Delivery ConditionSolution annealed, pickled & polished
Tensile Strength≥ 448 MPa
Yield Strength (0.2% offset)≥ 172 MPa
Elongation in 2 in. / 50 mm≥ 30%

Physical Properties

PropertyValue
Density7.94 g/cm3
Thermal Conductivity11.5 W/m·K
Specific Heat Capacity460 J/kg·K
Elastic Modulus196 GPa
Magnetic PropertiesPractically non-magnetic

Industry Applications

Heat Exchangers & Boiler Tubes
Power Plants & Superheaters
Chemical & Petrochemical Industry
Heat Treatment Furnaces
Hydrogen & Syngas Production
Boiler Feedwater Heaters
Pressure Vessels & Reactors
Flue Gas Desulfurization

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Lidun Industrial Park, Lidun Town, Zhouning County, Ningde City, Fujian Province,355400,China

+86-577-88877003
+86-577-88877015
+86-577-88877019

+86 13587686960

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Lidun Industrial Park, Lidun Town, Zhouning County, Ningde City, Fujian Province,355400,China

+86-577-88877003
+86-577-88877015
+86-577-88877019

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