General Description

Incoloy 825 is a nickel-iron-chromium super alloy with addition of molybdenum and copper, resisting wide range of corrosive environments and intergranular sensitization.

Incoloy 825 has exceptional resistance to seawater and to reducing chemicals, such as sulfuric and phosphoric acids. Because it is stabilized against sensitization, Incoloy 825 resists intergranular corrosion. This alloy contains sufficient nickel to make it resistant to chloride stress-corrosion cracking. Its molybdenum content provides resistance to pitting. Its chromium content provides resistance to oxidizing media, such as nitric acid, nitrates, and oxidizing salts.

Typical applications include phosphoric acid evaporators, pickling equipment, chemical processing vessels and piping, equipment for recovery of spent nuclear fuel, propeller shafts, tank trucks and so on.

Chemical Composition

Grade Ni% Cr% Mo% Fe% Al% Ti% C% Mn% Si% Cu% P% S%
Incoloy 825 38.0-46.0 19.5-23.5 2.5-3.5 Bal. Max 0.2 0.6-1.2 Max 0.05 Max 1.0 Max 0.5 1.5-3.0 Max 0.02 Max 0.03


UNS N08825

Werkstoff Nr. 2.4858


Incoloy 825 Bar: ASTM B425

Incoloy 825 Forgings: ASTM B564

Incoloy 825 Welded Tube: ASTM B704/705

Incoloy 825 Seamless Tube: ASTM B423

Incoloy 825 Sheet/Plate: ASTM B424

Physical Properties


Melting Point: 1370°C-1400 °C

Mechanical Properties

Solution Annealed

Tensile: Min 550 MPa

Yiled: Min 250 MPa

Elongation: Min 35%

Welding of Incoloy 825

Any traditional welding procedures can be used to weld Incoloy 825 to similar alloys or other metals, such as gas tungsten arc welding(GTAW), plasma arc welding (PAW), metal inertia gas welding (MIG) and so on. Before welding, remove scale, grease, mark and imprint.

Recommend filler wire regarding welding Incoloy 825: ERNiCrMo-3 or ERNiFeCr-1.

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