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UNS N08810/UNS N08811-Incoloy 800 H is a nickel-iron-chromium alloy that shares the same basic composition as Incoloy 800 but has a significantly higher creep rupture strength. The increased strength is due to strict control of the carbon, aluminium, and titanium content, as well as a high temperature anneal. The 800H modification was made to regulate the carbon content (0.05 to 0.10 percent) and grain size (>ASTM 5) in order to optimise the stress rupture properties. To ensure the best high temperature properties, Incoloy 800 H has additional titanium and aluminium modifications (0.85 to 1.2 percent). Dual certified, the alloy combines the properties of the two forms. The chemical balance of the alloy enables it to resist carburization, oxidation, and nitriding atmospheres exceptionally well. Even after prolonged exposure to temperatures between 1200 and 1600 degrees Fahrenheit, where many stainless steels become brittle, 800HT will not become embrittled.

800HT demonstrates the superior cold forming characteristics associated with nickel-chromium alloys. When the grain size is extensively cold formed, a visible undulating surface known as "orange peel" results. 800HT is a stainless steel that can be welded using conventional techniques.

The alloy is commonly used in ethylene pyrolysis, hydrocarbon cracking, and furnaces for the cracking of vinyl chloride, diphenol, and acetic acid. Additionally, the alloy is used in the manufacture of valves, fittings, and other components that are subjected to corrosive attack between 1100 and 1800 degrees Fahrenheit.

Round bar with a diameter of 3/4" to 6", as well as thin gauge sheet and plate. Incoloy 800 H material is available in random lengths, cut to length, and machined to customer specifications. Drilling, threading, milling, CNC shapes, turning, tapping, and flange manufacturing are all examples of machining.

Chemical Requirements :

- Ni Cr Mn C Si Fe C
Max 35.0 23.0 1.5 0.10 1.0 0.75
Min 30.0 19.0 39.5

Mechanical Property :

- Ultimate Tensile, min. Yield Strength (0.2% OS) Elong. in 2 in. or 50mm (or 4D) min., % R/A Hardness
Min 80 KSi 35 KSi 25
Min 550 MPa 240 MPa


  • Heat exchangers and process piping
  • Chemical processing
  • Carburizing fixtures and retorts
  • Oil and gas industries
  • Nuclear and power industries
  • Commercial Gas Turbines
  • Furnace components
  • Food Processing
  • Electric range heating-element sheathing
  • Chemical Processing
  • Cryogenic Storage Tanks
  • Ammonia effluent coolers
  • Power generation industries
  • Nuclear reactors
  • Gas turbines engines
  • Pressure vessels
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