800/800H/800HT

Wst. 1.4876/1.4958/1.4959
UNS N08800/N08810/N08811

Stock program: Available on request

Specification: ASTM B 407 / ASTM B 163 / ASME SB-163
EN ISO 1127/96/NACE MR0175

Maximum service temperature: 1100°C/2000°F

Alloy 800, 800H and 800HT are nickel-iron-chromium alloys with good strength and excellent resistance to carburization and oxidation at high temperature environment. Alloy 800 was the first alloy with analyses  similar to that of alloy 800H and 800HT, except the higher level of carbon in 800H/HT and  the addition of aluminum in 800H and titanium in 800HT. the modification of alloy 800 into alloy 800H was to control carbon percentage and grain size to optimize stress rapture properties. Alloy 800 is primarily used for temperatures up to 600°C / 1100°F and the  alloys 800H/800HT are commonly used for temperature above. To ensure optimum high temperature properties the nickel alloy is dual certified as 800H/800HT and combines the properties of both forms.

Characteristics   

•  Excellent resistance to high temperature corrosion
•  Super creep and rapture strength during extended high temperature exposure
•  Stable metallurgical structure by long term exposure at high temperatures
•  Good corrosion resistance in many acidic environments
•  Very good resistance to sulfur-containing atmospheres
•  High resistance to chloride stress corrosion

Market applications:

•    Chemical processing
•    Oil & gas
•    Heat treating equipment
•    Nuclear power plants
•    Pulp & paper industry

Technical details