Alloy 825 • UNS N08825 • WNR 2.4858

Alloy 825 (UNS N08825) is an austenitic nickel-iron-chromium alloy with additions of molybdenum, copper and titanium. It was developed to provide exceptional corrosion resistance in both oxidizing and reducing environments. The alloy is resistant to chloride stress-corrosion cracking and pitting. The addition of titanium stabilizes Alloy 825 against sensitization in the as-welded condition making the alloy resistant to intergranular attack after exposure to temperatures in a range that would sensitize unstabilized stainless steels. The fabrication of Alloy 825 is typical of nickel-base alloys, with material being readily formable and weldable by a variety of techniques

Available tube product forms

Typical Applications

  • Condensers
  • Oil and gas well equipment
  • Hydraulic systems
  • Chemical injection lines
  • Chemical process equipment and vessels
  • Downhole control lines
  • Control and instrumentation
  • Acid Production
  • Nuclear fuel processing

Typical manufacturing specifications

  • ASTM B626
  • ASTM B423
  • ASTM B704
  • Also individual customer specifications.

Industries predominantly using this grade            

Technical Data

Mechanical Properties

Temper Annealed
Tensile Rm 85 ksi (min)
Tensile Rm 590 MPa (min)
R.p. 0.2% Yield 35 ksi (min)
R.p. 0.2% Yield 240 MPa (min)
Elongation (2” or 4D gl) 30 % (min)


Physical Properties (Room Temperature)

Specific Heat (0-100°C) 440 J.kg-1.°K-1
Thermal Conductivity 11.1 W.m -1.°K-1
Thermal Expansion 14 mm/m/°C
Modulus Elasticity 196 GPa
Electrical Resistivity 1.13 μohm/cm
Density 8.13 g/cm3


Chemical Composition (% by weight)

Element Min Max
C - 0.05
Si - 0.5
Mn - 1
P - 0.03
S - 0.03
Al - 0.2
Cr 19.5 23.5
Cu 1.5 3
Fe Balance
Mo 2.5 3.5
N 0.15 0.25
Ni 38 46
Ti 0.60 1.20
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