Incoloy 800H

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Product Description

Incoloy 800H

Incoloy 800H

Incoloy 800H Alloy is an austenitic high-strength solid-solution Ni-Fe-Cr Alloy with controlled levels of C, Al, Ti, Si and Mg and increased content of (Al + Ti).

A special solution anneal treatment gives highest creep-rupture strength above
700 ℃ due to the precipitation of TiC.
Below 700℃, gamma prime precipitates combined with loss of ductility.
excellent creep strength at temperature above 700 ℃

  • good resistance to reducing, oxidizing and nitriding atmospheres and to atmospheres which alternate between reducing and oxidizing conditions
  • metallurgical stability in long-term application at high temperatures

For applications where frequent excursions to temperatures lower than 700 ℃ during service cannot be excluded or parts of the material are permanently exposed to a temperature below 700 ℃, the use of Incoloy 800H is recommended.

Density: 7.95

Corrosion resistance

The high nickel and chromium contents of Incoloy 800H/HT Alloy ensure excellent resistance to oxidation.
The alloys are also very resistant to carburization, nitridation and oxidizing sulphur-bearing atmospheres.
The protective oxide film which is formed is adherent in both static and cyclic conditions of heating and cooling, and resistance to carburization is enhanced when a thin film of oxide is formed on the alloy through pre-oxidation prior to service. Resistance to hydrogen is excellent and Alloy800H/HT are standard materials used in the production of hydrogen in steam/hydrocarbon reforming processes.

Applications of Incoloy 800H:

Due to high strength during long periods of service and resistance to carburization and nitridation, Incoloy 800H/HT Alloy have found many applications in steam/hydrocarbon reforming for components such as: pigtails, headers/collectors/manifolds, transfer piping, catalyst tubes (in lowpressure processes) and quench-system piping.

Typical applications are:

  • ethylene pyrolysis tubing in convection and radiant sections – resistance to carburization and good mechanical properties
  • ethylene dichloride cracking tubes resistance to carburization and to dry hydrogen chloride and chlorine
  • cracking tubes used in the production of acetic anhydride and ketene – high strength, resistance to both carburization and the formation of sigma phase
  • components, e.g. heat exchangers, piping systems etc., in coal conversion plants
  • steam generator tubing in helium cooled, high temperature reactor systems ? high strength, resistance to helium and to steam

Chemical composition

Ni Cr Fe C Mn Si Cu P S Al Ti Al+Ti
min(%) 30.0 19.0 bal. 0.06 0.15 0.15 0.85
max(%) 32.0 23.0 0.10 1.5 1.0 0.75 0.03 0.015 0.60 0.60 1.2

Mechanical properties

Condition Yield Strength(Mpa) Tensile Strength(Mpa) Elongation(%) Hardness(HB)
ASTM Min Value Solution Annealed 170 450 30
Typical Values at RT Solution Annealed 245 559 40 140

International Specification Comparison chart

Material Round Bar Plate Pipe
Seamless Welded
UNS B408 B409 B407 B163
ASME N08811 SB408 SB409 SB407 SB163
JIS NCF800H NCF800HT H4553 G4901 H4552
DIN 1.4876 1.4959 17460 17460 17459


Product: Sheet, Coil, Pipe, Bar, Wire and Forgings