Stock Grades/Specifications

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Alloys 800H and 800HT

Alloy 800H (UNS N08810) is an austenitic high-strength solidsolution nickel-iron-chromium alloy with controlled levels of carbon, aluminium, titanium, silicon and manganese and controlled content of (Al+Ti).
The analysis is similar to that of Alloy 800, but a special solution treatment (with grain sizes ≥ 90μm/ASTM No.4) gives significantly increased creeprupture strength above 600°C (1110°F). For services below 600°C (1110°F) the use of soft annealed Alloy 800 is suggested.

These alloys are characterised by:

  • • good creep-rupture properties at temperatures above 600°C (1110°F) without loss of ductility during long term use at temperatures below 700°C (1290°F), due to limitation of (Ti+Al) content to max 0.7%
  • • good resistance to reducing, oxidising and nitriding atmospheres and to atmospheres which alternate between reducing and oxidising conditions
  • • metallurgical stability in long-term application at high temperatures

Alloy 800HT (UNS N08811) is an austenitic high-strength solidsolution nickel-iron-chromium alloy with controlled levels of carbon, aluminium, titanium, silicon and manganese and increased content of (Al+Ti).
A special solution treatment (with grain sizes ≥ 90μm/ASTM No.4) gives highest creep-rupture strength above 700°C (1290°F) due to the precipitation of TiC. Below 700°C (1290°F), gamma prime (’) precipitates combined with a loss of ductility.

Alloy 800HT is characterised by:

  • • excellent creep strength at temperature above 700°C (1290°F)
  • • good resistance to reducing, oxidising and nitriding atmospheres and to atmospheres which alternate between reducing and oxidising conditions
  • • metallurgical stability in long-term application at high temperatures
  • • where frequent excursions to temperatures lower than 700°C (1290°F) during service cannot be excluded or parts of the material with run permanently at a regime below 700°C (1290°F) the use of Alloy 800H is recommended

Designation and Standards - Alloy 800H

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