Incoloy 800HT Elbows with Resistance to aqueous corrosion at moderate temperatures
Incoloy 800HT, also known as ¡°Alloy 800HT¡±, is designated as UNS N08811 or DIN W.Nr. 1.4959. It is an iron-nickel-chromium alloy having the same basic composition as Incoloy 800 and Incoloy 800H but with significantly higher creep-rupture strength.
The high nickel and chromium contents in alloy 800H/800HT? results in excellent resistance to oxidation, carburization and sul?dation. These nickel steel alloys are identical except for the higher level of carbon in alloy 800H, and the addition of up to 1.20 percent aluminum and titanium in alloy 800HT. Incoloy 800 was the first of these alloys and it was slightly modified into Incoloy 800H. This modification was to control carbon (.05-.10%) and grain size to optimize stress rupture properties. The high nickel content also increases the resistance to nitriding, although resistance could be lower than other alloys containing a higher percentage of nickel, such as alloy 600.