Alloy 800

A nickel-iron-chromium alloy that is metallurgically stable in long term applications at high temperatures.

Alloy 800 is a Ni-Cr-Fe alloy containing small additions of aluminium and titanium. It is an austenitic heat resistant alloy designed for high temperature structural applications. The strength of 800H/AT is achieved by controlled levels of carbon, aluminum and titanium along with a 1148°C minimum anneal to achieve a grain size of ASTM 5 or coarser. The alloy is not hardenable by heat treatment but cold working can provide enhanced mechanical properties.

For severe service environments, nickel alloys come into their own offering far superior mechanical properties and corrosion resistance than many other corrosion resistant alloys. Depending on the application, alloys can be selected to give excellent performance over a wide range of temperatures, operating environments and media where strength and corrosion resistance are critical.

Marine engineering, chemical and petrochemical processing and the oil & gas industry all benefit from the use of these alloys in diverse components from valves through fasteners to drill collars.

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Related Specifications

  • UNS N08800 : ASTM B564

Properties

Chemical Composition

Applications

  • Super-heaters and re-heater tubing
  • Power generation
  • Heat exchangers
  • Pressure vessels
  • Dampers
  • Industrial furnaces
  • Hydrocarbon plants

Characteristics

  • Excellent high temperature strength
  • Oxidation, carburization and sulfidation resistance
  • Good creep-rupture properties
  • Metallurgical stability in long-term applications at high temperatures

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