Incoloy 825 (Alloy 825, UNS N08825) Flange Description
Incoloy alloy is also a range of superalloys produced by Special Metals Corporation. They are nickel-iron-chromium alloys that are used for applications that require high corrosion resistance and high-temperature strength. Incoloy alloys are quite similar to Inconel alloys but their different composition makes some distinctions in their applications.
Alloy 825 is a Nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium. The alloy's chemical composition provides exceptional resistance to many corrosive environments. The Nickel content is sufficient for resistance to Chloride-ion stress corrosion cracking. The nickel, combined with molybdenum and copper, also gives outstanding resistance to reducing environments such as those containing sulfuric and phosphoric acid. The molybdenum also aids resistance to pitting and crevice corrosion. The alloy Chromium content confers resistance to a variety of oxidizing substances such as nitric acid, nitrates and oxidizing salts. The titanium addition, with appropriate heat treatment, will stabilize the alloy against sensitization to intergranular corrosion.
Other trade names: Alloy 825, Nickelvac 825, Nicrofer 4241
Incoloy 825 (Alloy 825, UNS N08825) Flange Specifications
Metal Type: UNS N08825
Standard: ASTM B564
Chemical Composition, %
| |
Ni |
Fe |
Cr |
Mo |
Cu |
Ti |
C |
Mn |
S |
Si |
Al |
| Min |
38 |
22 |
19.5 |
2.5 |
1.5 |
0.6 |
|
|
|
|
|
| Max |
46 |
|
23.5 |
3.5 |
3.0 |
1.2 |
0.05 |
1.0 |
0.03 |
0.5 |
0.2 |
Incoloy 825 (Alloy 825, UNS N08825) Flange Applications
- Sulfuric acid pickling plant equipment, including heating coils, tanks, crates, baskets, and chains
- Fuel element dissolvers
- Offshore product piping system components and tubes sour gas service
- Seawater-cooled heat exchangers
- Paper industry – pipe digesters
- Pipelines for wet sulfur dioxide gas
- Phosphoric acid production equipment, including heat exchangers, evaporators, and scrubbers
- LPG (liquid petroleum gas) processing equipment, including air-cooled heat exchangers
Incoloy 825 (Alloy 825, UNS N08825) Flange Packing
Our Incoloy 825 materials are carefully handled during storage and transportation to preserve the quality of our product in its original condition.
Frequently Asked Questions
How does Incoloy 825 perform in high-temperature environments?
Incoloy 825 maintains good mechanical properties and oxidation resistance at elevated temperatures, making it suitable for applications up to around 540°C (1000°F).
Can Incoloy 825 be welded?
Yes, Incoloy 825 can be welded using common techniques such as TIG (Tungsten Inert Gas) and MIG (Metal Inert Gas) welding. Post-weld heat treatment is often recommended to restore corrosion resistance.
How does Incoloy 825 compare to Inconel 825?
Incoloy 825 and Inconel 825 are the same material. The terms "Incoloy" and "Inconel" are brand names, and both refer to the same nickel-iron-chromium alloy.
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