Incoloy 800HT features a more restricted chemistry, specifically requiring a higher combined total of aluminium and titanium (0.85-1.20%) compared to the base 800 or 800H grades. This allows 800HT to provide significantly higher creep and stress-rupture properties in temperatures exceeding 1100°F.
ASTM B407 Incoloy 800HT Seamless Pipe Manufacturer
At Zhejiang Xintongda Special Steel Manufacturing Co., Ltd, we make high-quality Incoloy 800HT Seamless Pipe for demanding thermal environments. This specific nickel-iron-chromium alloy contains approximately 30-35% nickel and 19-23% chromium, with added aluminium and titanium (0.85-1.20%). As a China-based manufacturer and a global supplier, we make sure our pipes fully comply with the ASTM, EN, JIS, GB, and GOST standards. Our Incoloy 800HT is a preferred choice over standard grades because the controlled chemical composition provides superior creep and stress-rupture resistance. Unique features include exceptional stability and resistance to oxidation, carburisation, and nitriding at temperatures up to 1800°F. These pipes are used in chemical processing, power generation and heat treatment furnaces. Every product undergoes strict quality checks including ultrasonic and hydrostatic testing, before delivery to guarantee performance. We are a multiple internationally certified manufacturer and supply high performance solutions with competitive pricing for Incoloy 800HT Seamless Pipe to assist our clients in optimising their operational costs and long-term infrastructure investments. We have an annual supply capacity of 25,000 tons.
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Standard
ASTM B407
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OD Range
6-457 mm
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Thickness
1-65 mm
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Length
≤ 18 m
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Technical Data
Technical Data
Manufacturing Process of Incoloy 800HT Pipe
Initially, the production of Incoloy 800HT pipe involves precision hot extrusion. Cold rolling or cold drawing is then carried out to obtain the necessary dimensions and mechanical properties. Following that, controlled solution annealing is used to improve creep resistance and grain size. For a detailed breakdown of the entire manufacturing process, click here.
Characteristics of Alloy 800HT Pipe
The main technical feature of ASTM B407 seamless pipe is that it maintains its structural integrity in changing thermal conditions. The following list shows the exact features of this grade:
- Good Corrosion Resistance: Resists aqueous corrosion at moderate temperatures and high-temperature oxidation. The high nickel content specifically provides protection against chloride-ion stress corrosion cracking, which often plagues standard stainless steels.
- Elevated Temperature Resistance: Maintains mechanical strength when exposed to heat up to 1800°F (982°C). The alloy remains stable during long term exposure, preventing the phase transformations that lead to brittleness in other materials.
- Chemical Composition: Incoloy 800HT pipe contains optimal proportions of nickel, iron, and chromium. This composition ensures that a protective oxide scale forms and sticks tightly to the metal surface when the temperature changes.
- Workability: Exhibits excellent cold forming characteristics despite high strength. It can be welded using standard techniques such as GTAW or GMAW provided the matching filler metal is used to maintain the 800HT properties.
- Mechanical Properties: Controlled additions of titanium and aluminum lead to high stress-to-rupture values. Aluminum and titanium additions enhance high-temperature strength by maintaining microstructural stability.
Incoloy UNS N08811 Equivalent Material
Incoloy 800HT is identified as UNS N08811. Some of the commonly known equivalents are DIN 1.4859 and different specs of the Incolloy alloy 800HT series.
| GRADE | UNS | GB | JIS | ISO | DIN/EN | GOST | |
| ISC | NEW | ||||||
| Incoloy 800HT | N08811 | - | NS112 | NCF800HT | - | 1.4859 | - |
Difference Between Incoloy 800H vs 800HT
While both alloys belong to the same family, the primary distinction lies in the chemistry and the resulting strength at high temperatures. Both grades are solution annealed to achieve a coarse grain size, but the 800HT variant requires a more restrictive chemical range to ensure maximum creep resistance.
| Feature | Incoloy 800H (UNS N08810) | Incoloy 800HT (UNS N08811) |
| Carbon Content | 0.05% – 0.10% | 0.06% – 0.10% |
| Aluminium (Al) | 0.15% – 0.60% | 0.25% – 0.60% |
| Titanium (Ti) | 0.15% – 0.60% | 0.25% – 0.60% |
| Al + Ti Total | 0.30% – 1.20% | 0.85% – 1.20% |
| Annealing Temperature | Minimum 2050°F（1121°C) | Minimum 2050°F（1121°C) |
| Primary Strength | High creep resistance | Superior stress-rupture strength |
100% Certified Testing & Documentation
- EN 10204 3.1 and EN 10204 3.2 Material Test Certificates (MTC)
- Raw Materials Certificate
- 100% PMI
- Heat Treatment Charts
- Third-Party Inspection Report
- Surface roughness and size measurement
- Manufacturer Test Certificate (Impact Testing, Flattening, Flare, Bend, Hardness, Intergranular, Pitting Corrosion, Grain size, ET, UT, HT)
- Laboratory Test Certificate from the Government-Approved Lab
Application of Incoloy 800HT Seamless Nickel Alloy Pipe
Incoloy 800HT pipe is widely used in sectors where equipment must withstand both heat and corrosive atmospheres. Incoloy 800HT pipe is essential in:
Chemical Processing
We supply these pipes for heat exchanger components and piping systems in volatile chemical reactions. The alloy is particularly effective in high-temperature processes involving hydrocarbons and steam-methane reforming.
Pollution Control
Found in scrubbers and systems dealing with corrosive exhaust gases. The resistance to sulfur-bearing atmospheres makes it ideal for waste-to-energy plants and industrial incinerators.
Oil and Gas Recovery
Applied in downhole equipment and steam injection systems. It handles the high pressures and thermal stresses found in enhanced oil recovery operations without losing structural stability.
Acid Production and Pickling Operations
Resistant to nitric acid and various organic acids. We manufacture these pipes for use in acid cooling systems and heating coils where long-term durability is a priority.
Paper Mills
Utilised in digester liquor heaters and bleaching equipment. The alloy stands up to the aggressive chemicals used in wood pulp processing and the high-pressure steam required for the machinery.
Power Generation
Essential for superheater and reheater tubing in steam boilers. It provides the necessary creep-rupture strength for decades of service in modern power plants.
Frequently Asked Questions
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How is 800HT different from Incoloy 800/800H Pipe?