Incoloy 800 is the nickel-iron-chromium alloy which shows different characteristics and shows its use in a vast number of applications. This alloy is capable of maintaining the austenitic structure. This nickel steel alloy has a high level of carbon in 800 H and there is also added 1.20 % aluminum as well as titanium in this 800HT alloy. Incoloy 800 is the first alloy as it is slightly modified in an Incoloy 800H. The modification was done to control the carbon as well as the grain size in order to optimize stress rupture character.
This nickel alloy is a double certified and it combines the characteristics of both the forms (800H/HT). Incoloy 800H/HT alloy is intended for the high temperature as well as structural application. Nickel of this alloy makes it highly resistant to chloride stress corrosion cracking as well as embrittlement from the precipitation. In an annealed condition this alloy shows superior creep as well as stress rupture properties.
If we talk about the uses of the Incoloy 800 then it is used in an application where there is temperature up to 1100°F. The chemical balance enables the nickel steel alloy to show excellent resistance to the oxidation, carburization as well as nitriding atmosphere. The Incoloy 800HT Rod is not embrittled even after the large period of use in the 1200 to 1600° F where various stainless steel becomes embrittle.
Types of Incoloy 800 bars-
There are various forms in which the Incoloy 800 bars are offered some of which are the hex, round, rectangular, square, rolled round bar. These bars are given the finishing as bright polishes, rough turned, matt finish and the BA finish.
Incoloy 800 alloy has good mechanical strength over a wide temperature range. The equipment in which these are used is designed based on the tensile properties. This alloy shows higher tensile strength at the room temperature. Cold work substantially enhances the tensile properties of this alloy. This alloy also shows high impact strength as well as remains hard at the cryogenic temperatures. The compressive yield strength of this alloy is similar to tensile yield strength.
Various Characteristics of the Incoloy 800 bars–
- High creep rupture strength
- High-temperature strength
- Excellent corrosion resistance in the acidic environment
- Excellent resistance to sulfur-containing atmospheres
- Resistance to carburization as well as oxidation in the elevated temperature environment
What are the Applications in which Incoloy 800 bars is used?
- Ethylene furnace quench boiler
- Industrial furnaces
- Valves, fittings as well as in apparatus exposed to corrosive attack
- Heat treatment equipment
- Hydrocarbon cracking
- Pressure vessels
- A super heater as well as re heater in the power plants
- Petrochemical as well as chemical processing
- Heat exchangers
These alloys are widely used in an application which involves exposure to the corrosive atmosphere as well as elevated temperatures like paper pulp industry as well as nuclear power plants. Heat treatment equipment like trays, fixtures, and baskets employ Incoloy 800H/HT. petrochemicals as well as chemical processing industry uses this alloy for the piping system as well as heat exchangers in nitric acid media mostly where resistance to chloride stress corrosion is required. Power plant makes use of these alloys as a re-heater tubing as well as super heater tubing.