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Incoloy® Alloy 800H (UNS N08811) Fe base, Ni 32, Cr 21, Mn 1.5

UNS N08810 / UNS N08811
Exhibits excellent resistance to carburization, oxidation and nitriding atmospheres. The alloy is dual certified and combines the properties of both forms.

800HT is an iron-nickel-chromium alloy having the same basic composition as Alloy 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.
Unit of Measure

Mechanical Data

Single Point Turning

 N/A Finishing - 0.025" depth, 0.007"/rev feed - 200 SFM Roughing - 0.15" depth, 0.015"/rev feed -175 SFM

Drilling

 N/A 1/2" Dia hole - 0.007"/rev feed - 60 SFM 1/4" Dia hole - 0.004"/rev feed - 60 SFM 3/4" Dia hole - 0.010"/rev feed - 60 SFM

Reaming

 N/A 1/2" Dia hole - 0.007"/rev feed - 100 SFM 1/4" Dia hole - 0.004"/rev feed - 100 SFM 3/4" Dia hole - 0.010"/rev feed - 100 SFM

Side and Slot Milling

 N/A Finishing - 0.050" depth - 0.009"/tooth feed - 140SFM Roughing - 0.25" depth - 0.007"/tooth feed - 125SFM

Additional Information

Additional Information

 N/A The 800H modification was to control carbon (0.05 to 0.10%) and grain size to (>ASTM 5) to optimize stress rupture properties. 800HT 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 ºF 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.

Typical applications for the alloy include ethylene pyrolysis, hydrocarbon cracking, cracking furnaces for vinyl chloride, diphenol and acetic acid. The alloy is also used for valves, fittings and other components exposed to corrosive attack from 1100 to 1800 ºF.

Round bar ranging from 3/4" to 6" diameter, and light gauge sheet and plate. Material can be supplied in random lengths, cut to order or machined to customer requirements. Machining includes drilling, threading, milling, CNC shapes, turning, tapping, flanges and others.