What is INCOLOY material?
Incoloy 825 (Nickel 825) Strip, Coil, Foil, Wire, AMS 5542, ASTM B424
Application areas
chemical processing components
pollution control
Oil and gas recovery
Pickling tank parts
Nuclear fuel processing
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)
form
Coil
strip
defeat
ribbon
metallic line
contour
round
flat
square
INCOLOY 825 Mechanical Properties at Room Temperature
Annealing typical values
Ultimate tensile strength: 85 KSI min (586 MPa min) Yield strength: (0.2% offset) 35 KSI min (241 MPa min) Elongation: 30% mi
Conditioning:
lncoloy 825 can be cold rolled to various states. Please contact GNEE Technical Services for more information.
Additional features
Corrosion resistance of INCOLOY 825
See NACE (National Society of Corrosion Engineers) recommendations.
Finishes
#1 - Hot rolled, annealed and descaled. It is available in ribbon, foil and strip form. It is used in applications where a smooth decorative surface is not required.
#2D - Matt surface produced by cold rolling, annealing and descaling. For use on deep drawn parts and those where lubricant needs to be retained during the forming process. #2B - Smooth surface produced by cold rolling, annealing and descaling. A slight cold rolling pass is added after annealing using a polishing roller to give it a brighter surface finish than 2D.
#BA-bright annealed cold rolled and bright annealed
#CBA - Of course bright annealed cold rolled matte finish and bright annealed
#2 - Cold Rolled
#2BA - Smooth surface produced by cold rolling and bright annealing. A light pass using a highly polished roller produces a smooth surface. 2BA finishes can be used in light forming applications where a glossy finish is required on the formed part. Polishing - Various grit surface treatments to meet specific polishing requirements. Not all finishes are available on all alloys - please contact GNEE sales for more information.
Wire finish
XC - Ultra Clean Bright Annealed or Bright Annealed and Cold Rolled Grease - Ultra Bright Finish (for decorative applications) Soap - A soapy coating on the wire acts as a lubricant. For custom wire finishes, please contact GNEE.
heat treatment
lncoloy 825 cannot be hardened and heat treated.
