INCOLOY® 825 / N08825
Other common names: Alloy 825
Incoloy 825 is a nickel-iron-chromium alloy with additions of molybdenum and copper. This nickel steel alloy’s chemical composition is designed to provide exceptional resistance to many corrosive environments. It is similar to alloy 800 but has improved resistance to aqueous corrosion. It has excellent resistance to both reducing and oxidizing acids, to stress-corrosion cracking, and to localized attack such as pitting and crevice corrosion. Alloy 825 is especially resistant to sulfuric and phosphoric acids. This nickel steel alloy is used for chemical processing, pollution-control equipment, oil and gas well piping, nuclear fuel reprocessing, acid production, and pickling equipment.
Relevant Standards
Inconel 825 is covered by the following standards:
- BS 3076 NA 16
- ASTM B425
Equivalent Materials
Inconel 825 is the tradename of Special Metals Group of Companies and equivalent to:
- W.NR 2.4858
- UNS N08825
- AWS 022
In what forms is Incoloy 825 available at SAGAR STEELS ?
- Sheet
- Plate
- Bar
- Pipe & Tube (welded & seamless)
- Fittings (i.e. flanges, slip-ons, blinds, weld-necks, lapjoints, long welding necks, socket welds, elbows, tees, stub-ends, returns, caps, crosses, reducers, and pipe nipples)
Chemical Composition of Inconel 825
The compositional range for Inconel 825 is provided in the table below.
|
Element |
Content |
|
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 % |
Availability :
Alloy 825 is available as round / flat / sheet
/ hexagonal / plate/ square / coil / pipe & fittings.
Typical Properties of Inconel 825
Typical properties of Inconel 825 are covered in the following table.
|
Property |
Metric |
Imperial |
|
Density |
8.14 g/cm3 |
0.294 lb/in3 |
|
Melting point |
1400°C |
2550°F |
|
Co-Efficient of Expansion |
14.0 µm/m.°C |
7.8x10-6 in/in.°F |
|
Modulus of rigidity |
75.9 kN/mm2 |
11009 ksi |
|
Modulus of elasticity |
196 kN/mm2 |
28428 ksi |
Properties of Supplied Materials and Heat Treated Materials
|
Condition of Supply |
Heat Treatment (After Forming) |
|||
|
Spring Temper/Spring Temper |
Stress relieve at 450 - 470°C (840 - 880°F) for 30-60 minutes and air cool. |
|||
|
Condition |
Approx Tensile Strength |
Approx Service Temp. |
||
|
Annealed |
600 - 800 N/mm2 |
87 -116 ksi |
-100° to +250°C |
-145° to +480°F |
|
Spring Temper |
800 - 1000 N/mm2 |
116 - 159 ksi |
-100° to +250°C |
-145° to +480°F |
Applications of Inconel 825
Inconel 825 typically finds application in:
- Chemical Processing
- Nuclear Fuel Reprocessing
- Acid Production
- Pickling Equipment
Corrosion Resistance
Alloy 825 has a high level of corrosion resistance. It resists general corrosion, pitting, crevice corrosion, intergranular corrosion, and stress-corrosion cracking in both reducing and oxidizing environments.