ASTM B564 N08811 Incoloy 800HT Concentric Reducer ANSI B16.5 PT UT

What is N08811 / Incoloy 800HT?

Incoloy 800HT is a nickel-iron-chromium alloy, and also a modified version of alloy 800. It has high creep-rupture strength.

Incoloy 800 HT is an iron-nickel-chromium alloy having the same basic composition as Incoloy 800, with significantly higher creep rupture strength. The higher strength results from close control of carbon, aluminum and titanium contents in conjunction with a high temp anneal.

The 800HT modification was to control carbon (0.05 to 0.10%) and grain size to (>ASTM 5) to optimize stress rupture properties. Incoloy 800 HT has further modifications to the combined titanium and aluminum levels (0.85 to 1.2%) to ensure optimum high temperature properties. The alloy is dual certified and combines the properties of both forms.

The chemical balance allows the alloy to exhibit excellent resistance to carburization, oxidation and nitriding atmospheres. 800HT will not become embrittled even after long periods of usage in the 1200-1600 deg F range where many stainless steels become brittle.

Excellent cold forming characteristics typically associated with the nickel-chromium alloys are exhibited with 800HT. When cold formed extensively the grain size produces a visibly undulated surface called “orange peel”. 800HT can be welded by the common techniques used on stainless steels.

Incoloy 800/H/HT Chemical Composition

Incoloy 800HT Mechanical Properties

Incoloy 800/H/HT Equivalent

Penetration Test

Application

-Gas Processing Industries
-Petrochemical
-Power Generation
-Food Processing
-Chemical
-Oil & Gas