What is Incoloy 825 material?
Description of INCOLOY 825
In the oil and gas industry, the two most important nickel alloys are Inconel 625 and Incoloy 825. Incoloy 825 is an austenitic nickel-iron-chromium-molybdenum-copper alloy containing high levels of chromium, nickel, copper and molybdenum to provide a high level of nickel alloy corrosion resistance to moderately oxidizing and moderately reducing environments. This balance of alloying elements gives the alloy excellent resistance to chloride stress corrosion cracking, crevice corrosion and general corrosion. The high content of nickel in this nickel alloy combined with the significant amounts of molybdenum and copper produces significantly improved corrosion resistance in corrosive environments, such as reducing environments, compared to stainless steel. Adding titanium to the alloy also helps stabilize the alloy and prevent intergranular corrosion. Chloride stress corrosion cracking is a type of localized intergranular corrosion that occurs in materials exposed to tensile strength, high temperatures, and environments containing oxygen and chloride ions, such as seawater.
As an austenitic nickel alloy, the material is ductile over a wide temperature range, from cryogenic temperatures to over 1000 °F (538 °C). The machinability of nickel alloys is typical, and the material is easy to shape and weld by a variety of techniques.
chemical typical
Nickel: 38.00 - 46.00
Chrome: 19.50 - 23.50
Iron: 22.00 minutes
Titanium: 0.06 - 1.2
Molybdenum: 2.50 - 3.50
Copper: 1.50-3.00
Carbon: 0.05 max
Manganese: 1.0 or less
Sulfur: 0.03 maximum
Silicon: Max 0.5
Aluminum: Max 0.2
physical properties
Density: 0.294 lb/in3, 8.14 g/cm3
Specific Heat, (32 - 212 °F), Btu/lb·°F, (0 - 100 °C), J/kg·°C: 0.105 (440)
Average coefficient of thermal expansion: in/inl°F (mm/ml°C):
70 - 212°F (20 - 100°C): 7.7 x 10-5 (13.9)
Thermal Conductivity: BTU/h-ft-°F (W/m-°K) 70°F (21°C): 6.4 (11.1)
Modulus of elasticity: ksi (MPa)
28.4 x 103 (196 x 103) stretched
Magnetic permeability H = 200 Oersted at 70°F (21°C):
Annealing: 1.005
Melting point: 2500 - 2550 °F (1370 - 1400 °C)
