Incoloy 825* Specification
*Trade name of Special Metals Group of Companies

  • W.NR 2.4858
  • UNS N08825
  • AWS 022

Applicable Standards:

  • BS 3076 NA16
  • ASTM B425
  • NACE MR0175 / ISO 15156-3

 

Incoloy 825 is a Nickel-Iron-Chromium alloy with additions of Molybdenum and Copper. It has excellent resistance to both reducing and oxidising acids, to stress-corrosion cracking and to localised pitting and crevice corrosion. It is also especially resistant to sulphuric and phosphoric acids.

Good Mechanical Properties at Elevated Temperatures No
Corrosion Resistant at Ambient Temperatures Yes
Corrosion Resistant & Good Mechanical Properties at Elevated Temperatures No
Oxidation Resistant No
Precipitation Hardenable No

Applications include:

  • Chemical Processing
  • Nuclear Fuel Reprocessing
  • Acid Production
  • Pickling Equipment

Approximate Chemical Composition
Ni 38 - 46%
Fe 22% min
Cr 19.5 - 23.5%
Mo 2.5 - 3.5%
Cu 1.5 - 3%
Ti 0.6 - 1.2%
Properties
DENSITY 8.14 g/cm3 0.294 lb/in3
MELTING POINT 1400oC 2550oF
COEFFICIENT OF EXPANSION 14.0 µm/m °C
(20 - 100°C)
7.8 x 10-6 in/in °F
(70 - 212°F)
MODULUS OF RIGIDITY 75.9 kN/mm2 11009 ksi
MODULUS OF ELASTICITY 196 kN/mm2 28428 ksi
CONDITION OF SUPPLY HEAT TREATMENT (AFTER FORMING)
Annealed/Spring Temper Stress relieve at 450 - 470oC (840 - 880oF) for 30 - 60 minutes and air cool.
CONDITION APPROX TENSILE STRENGTH APPROX SERVICE TEMPERATURE
Annealed 600 - 800 N/mm2  87 - 116 ksi -100 to +250oC -145 to +480oF
Spring Temper 800 - 1100 N/mm2 116 - 159 ksi -100 to +250oC -145 to +480oF
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