Incoloy 800 / 800H / 800HT Iron-Nickel-Chromium Alloy Plate / Sheet

Description (English)

Incoloy 800/800H/800HT alloys are workhorse materials for high-temperature service in chemical, petrochemical, and power-generation industries. The base alloy (800) provides general oxidation resistance and good mechanical properties up to 815 °C. 800H is the higher-carbon variant (0.05–0.10% C) solution-annealed at 1149 °C minimum to develop a coarse grain size (ASTM 5 or coarser) for improved creep-rupture strength. 800HT is a further refinement of 800H with tighter Al+Ti control (0.85–1.20%) and is solution annealed at 1175 °C minimum to maximize high-temperature creep-rupture properties. The alloys are often selected for reformer tubes, cracking furnace components, heat-treatment fixtures, and superheater/reheater tubing.

Size Range

• Plate: thickness 0.5–100 mm × width ≤ 2400 mm × length ≤ 6000 mm
• Sheet: thickness 0.3–6.0 mm × width ≤ 1500 mm
• Strip: thickness 0.05–3.0 mm × width ≤ 600 mm (coil)

Grade Specification

Chemical Composition

Physical Properties

Applications

• Industrial furnace components — radiant tubes, muffles, retorts, baskets
• Steam generator tubing — superheater, reheater, economizer
• Ethylene pyrolysis furnace tubes
• Hydrocarbon reformer outlet headers and pigtails
• Heat-treatment fixtures, trays, and baskets
• Nuclear steam generator — heat exchanger tubes
• Chemical process equipment — high-temperature reactors
• Refinery — catalytic cracking units
• Power generation — superheater supports, headers
• Carbon-steel weld overlay — hot-spot corrosion protection
• Petrochemical — reactor vessels, transfer piping
• Heat shields, recuperators
• Gas turbine ducting and exhaust components
• Sodium lamps and electron tube components
• Pulp and paper — digester vessels, blow tanks