Incoloy 800HT Steel Pipe

Incoloy 800HT (designated under UNS N08811 and DIN W.Nr. 1.4959) is a solid-solution strengthened iron-nickel-chromium superalloy. While it belongs to the broader 800-series family, it is specifically modified to optimize long-term mechanical stability at temperatures exceeding 1100°F (593°C). HT PIPE is a incoloy astm b407 uns n08811 Pipe supplier with 15+ export experience. Contact us for more information and quotes for free!

Product Forms

Bar & Rod

Plate & Sheet

Coil & Strip

Pipe & Tube

Fitting: Flange, Tee, Elbow, Reducer etc.

Forging: Ring, Shaft, Circle, Block etc.

Contact now

Procurement & Compliance: Navigating Specifications

When issuing a Request for Quote (RFQ) for high-performance piping, absolute adherence to international material standards is required to ensure field safety. Incoloy 800HT pipes are manufactured and verified under distinct technical standards:

Seamless Pipe & Tube: Manufactured under ASTM B407 and ASME SB407. Cold-drawn seamless processing offers uniform wall thickness and completely eliminates the risk of weld-seam weld decay or structural variations.

Welded Pipe: Certified under ASTM B514 / ASME SB514. These are typically chosen for larger nominal bore sizes where seamless options become cost-prohibitive, provided the weld line undergoes rigorous non-destructive testing (NDT).

Pressure Code Approval: Components intended for structural pressure boundary lines are fully certified under the ASME Boiler and Pressure Vessel Code (Section VIII, Division 1).

Alloy 800/800H/800HT Chemical Composition

Oxidation & Carburization Resistance

The chromium content builds a resilient, self-healing oxide layer that prevents surface degradation at temperatures up to 2100°F (1150°C). It strongly resists carburization (carbon absorption) in reducing gas environments.

Chloride Stress Corrosion Cracking (SCC)

With high nickel chemistry (30–35%), 800HT is virtually immune to chloride-induced stress corrosion cracking, a vulnerability that frequently plagues standard 300-series stainless steels.

No Intergranular Embrittlement

Unlike many ferritic or austenitic steels, Incoloy 800HT resists the precipitation of the brittle "sigma phase" during long-term thermal exposure in the crucial 1200°F to 1600°F (649°C to 871°C) range.

Primary Industrial Applications

Because Incoloy 800HT pipes maintain dimensional stability and pressure containment under extreme thermal stress, they are heavily utilized across three core sectors:

1. Petrochemical and Hydrocarbon Processing

In facilities running steam/hydrocarbon reforming processes, ethylene production, and cracking systems, piping networks are bombarded by volatile process gases and intense external heat. Incoloy 800HT is the industrial standard for catalyst tubing, pigtails, outlet manifolds, and transfer lines where lesser metals would quickly suffer stress rupture.

2. Power Generation and Nuclear Systems

Modern power facilities achieve higher thermal efficiencies by operating at increased temperatures. 800HT piping systems serve as steam superheater tubing, high-temperature heat exchangers, and cooling lines within both conventional coal-fired utilities and advanced gas-cooled nuclear reactors.

3. Thermal Processing and Furnace Manufacturing

For commercial heat-treating infrastructure, structural integrity under thermal cycling is everything. Seamless 800HT pipes are fabricated into industrial furnace radiant tubes, retorts, muffles, and high-temp process headers that must endure constant expansion and contraction cycles.

Hot Tags: incoloy 800ht steel pipe, China incoloy 800ht steel pipe manufacturers, suppliers