A nickel-iron-chromium grade with addition of molybdenum and copper, Alloy 825 has excellent corrosion resistance.

Alloy 825 is a high performing nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium. The nickel content is sufficient for resistance to chloride-ion stress-corrosion cracking.

  • UNS Number: N08825
  • Werkstoff Number: 2.4858
  • ASTM: B163, B423, B424, B425, B564, B704, B705, B366, B751, B775, B829

Product availability

Pipe (Seamless)
Pipe (Welded)
Pipe Fittings
Round Bar

Chemical analysis



  • Fuel element dissolvers
  • Sea-water-cooled heat exchangers; offshore product piping systems; tubes and components in sour gas service
  • Heat exchangers, evaporators, scrubbers, dip pipes etc. in phosphoric acid production
  • Air-cooled heat exchangers in petroleum refineries
  • Chemical and Food Processing

About Alloy 825

The nickel in Alloy 825, in conjunction with the molybdenum and copper, gives superb resistance to reducing environments such as those containing sulphuric and phosphoric acids. The molybdenum prevents resistance to pitting and crevice corrosion. The alloy’s chromium content confers resistance to a variety of oxidising substances such as nitric acid, nitrates and oxidising salt.

NeoNickel specialises in supplying high performance metal alloys to a wide variety of industries. As a highly respected European supplier we provide the finest quality heat resistant, corrosion resistant, aerospace, titanium and stainless steel alloys anywhere on the market.

  • Density: 8.14 g/cm³
  • Melting Range: 1370-1400°C
  • Specific Heat Capacity: 440 J/kg.°C
  • Electrical Resistivity: 1.13 µΩ.m
  • Poisson's Ratio: 0.29 - 0.34

Mechanical & Physical Properties

Mechanical & Physical Properties21.1°C93.3°C148.9°C204.4°C315.6°C371.1°C426.7°C537.8°C684.9°C982°C
Ultimate Tensile Strength /MPa585530525515500495485---
0.2% Yield Strength /MPa240205190180170165155---
Elongation %30---------
Coefficient of Thermal Expansion /µm/m°C **-
Thermal Conductivity /kcal/(hr.m.°C)9.5510.57810.57811.86813.22414.53414.53415.65216.856-
Modulus of Elasticity / GPa196192192187181174174168162118
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