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 |
Designations
UNS N08825
Werkstoff Nr. 2.4858
Specifications
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
Density：8.1g/cm3
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.