There are numerous advantages to Incoloy 825 (UNS n08825) over other nickel-iron-chromium alloys, such as molybdenum, copper, and titanium. It is an alloy that provides high levels of corrosion resistance to both moderately oxidizing and moderately reducing environments. It is similar to alloy 800, but it is more resistant to corrosion in aqueous environments.
There are two nickel alloys in the oil and gas industry that are very important. The most important are Inconel 625 and Incoloy 825 Seamless. As an austenitic nickel-iron-chromium-molybdenum-copper alloy containing high levels of chrome, nickel, copper, and molybdenum, Nickel 825 provides high corrosion resistance to both moderately oxidizing as well as moderately reducing environments. In addition to its exceptional resistance to chloride stress corrosion cracking, this alloy also exhibits exceptional resistance to crevice corrosion and general corrosion due to its balanced alloying elements. As a result of the high level of nickel in this nickel alloy, together with the amounts of molybdenum and copper present in the alloy, it has significantly better corrosion resistance in environments that are highly corrosive, such as reducing environments. Titanium also contributes to the stability of the alloy against intergranular corrosion by being added to this alloy. The corrosion cracking caused by chloride stress corrosion cracking is a localized intergranular corrosion phenomenon that occurs when materials are subjected to high temperatures, oxygen, and chloride ions, such as seawater when they are put under tensile strength.
Typical for nickel alloys, the material is readily formable and weldable to a wide range of temperatures from cryogenic to well in excess of 1000°F (538°C).
With additions of molybdenum, copper, and titanium, Incoloy 825 is a nickel-iron-chromium alloy designed to provide exceptional corrosion resistance in many corrosive environments. In comparison with alloy 800, it has improved aqueous corrosion resistance. In addition to its excellent resistance to both reducing and oxidizing acids, it also exhibits excellent resistance to stress corrosion cracking, pitting, and crevice corrosion, as well as localized attack. A nickel steel alloy called alloy 825 composition has excellent resistance to sulfuric acid and phosphoric acid, which makes it ideal for chemical processing, pollution-control equipment, oil and gas well piping, nuclear fuel reprocessing, acid production, and pickling equipment.
In what applications is Incoloy a 825 material used?
- Processing of chemicals
- Control of pollution
- Piping for oil and gas wells
- Reprocessing of nuclear fuel
- Pickling equipment consists of a number of components, such as heating coils, tanks, baskets, and chains
- Production of acid in the body
What are the characteristics of Incoloy 825?
- Resistant to both reducing and oxidizing acids with excellent corrosion resistance
- Stress-corrosion crack resistance is a good feature of this material
- Resistance to localized attacks such as pitting and crevice corrosion that is satisfactory
- It is very resistant to sulfuric and phosphoric acids
- In both room and elevated temperatures up to approximately 1000 degrees Fahrenheit, this material has excellent mechanical properties
- Pressure vessels are permitted to be used in temperatures up to 800 degrees Fahrenheit at the wall of the vessel
Types Of Incoloy 825 Material Plates, Sheets, and Coils:
- Incoloy 825 Plates
- Incoloy 825 Sheets
- Incoloy 825 Shim Sheet
- Incoloy 825 Perforated Sheet
- Incoloy 825 Chequered Plate
- Incoloy 825 Roll
- Incoloy 825 Ring
- Incoloy 825 Circles
- Incoloy 825 Coils
- Incoloy 825 Strips
- Incoloy 825 Flat
- Incoloy 825 Blank
- Incoloy 825 Profile
- Incoloy 825 Foils
Applications of Incoloy 825 Material
- Sulphuric acid piping and vessels
- Phosphoric acid evaporators
- Pickling tank heaters, pickling tanks, and equipment
- Chemical process equipment
- Propellor shafts
- Tank trucks
- Calorifiers
- Electrostatic precipitator electrodes
- Hot vessels for food, water, and seawater,
- Ammonium sulfate vessels
- Expansion bellows
- Marine exhaust systems
- Power station ash hoppers
