Alloy Wire International
Datasheet: Incoloy® 825
Incoloy® 825
Incoloy® 825 is a Nickel-Iron-Chromium alloy with additions of Molybdenum and Copper. It has excellent resistance to both reducing and oxidising acids, to stress-corrosion cracking and to localised pitting. It is also especially resistant to sulphuric and phosphoric acids. Alongside Inconel® 625, Incoloy® 825 is one of the most important nickel alloys for the oil and gas industry. Thanks to the balance of elements, it offers exceptional resistance to chloride stress corrosion cracking, as well as crevice corrosion and general corrosion.
Incoloy® 825 is also known as Nicrofer 4221, Superimphy 82 and Ferrochronin 825.
Available in all profile options
Key Features
Incoloy® 825 offers the following key features:
Resistant to reducing environments such as those containing sulphuric and phosphoric acids
Resistant to a variety of oxidising substances such as nitric acid and nitrates
Resistant to chloride-ion stress corrosion cracking and, pitting & crevice corrosion
Good for chemical processing
Typical Applications
Incoloy® 825 is known to be suitable for the following applications:
Chemical Processing
Nuclear Fuel Reprocessing
Acid Production
Pickling Equipment
Designations
W.Nr 2.4858
UNS N08825
AWS 022
Specifications
ASTM B425
BS 3075 NA 16
BS 3076 NA 16
ISO 15156-3
(NACE MR 0175)
Chemical Composition
The chemical composition of Incoloy® 825 is indicated in the table below:
| Element | Min % | Max % |
|---|---|---|
| Ni | 38.00 | 46.00 |
| Co | – | 2.00 |
| Cu | 1.50 | 3.00 |
| Cr | 19.50 | 23.50 |
| Mo | 2.50 | 3.50 |
| Al | – | 0.20 |
| C | – | 0.05 |
| Si | – | 0.50 |
| Mn | – | 1.00 |
| S | – | 0.03 |
| Ti | 0.60 | 1.20 |
| Fe | Bal |
Alloy Details
Incoloy® 825 density, melting point, coefficient of expansion, and modulus of elasticity is indicated in the table below:
| Density | Melting Point | Coefficient of Expansion | Modulus of Rigidity | Modulus of Elasticity |
|---|---|---|---|---|
| 8.14 g/cm³ | 1400 °C | 14.0 μm/m °C (20 – 100 °C) | 75.9 kN/mm² | 196 kN/mm² |
| 0.294 lb/in³ | 2550 °F | 7.8 x 10-6 in/in °F (70 – 212 °F) | 11009 ksi | 28428 ksi |
Heat treatment of finished parts
The typical heat treatment of Incoloy® 825:
| Condition as supplied by AWI | Type | Temperature | Time | Cooling |
|---|---|---|---|---|
| Annealed or Spring Temper | Stress Relieve | 450 – 470 °C (840 – 880 °F) | 0.5 – 1 Hr | Air |
Properties
The typical mechanical properties of Incoloy® 825:
| Annealed | ||
|---|---|---|
| Approx. tensile strength | <800 N/mm² | <116 ksi |
| Approx. operating temperature depending on load** and environment | -100 to +250 °C | -145 to +480 °F |
| Spring Temper | ||
|---|---|---|
| Approx. tensile strength | 800 – 1100 N/mm² | 116 – 159 ksi |
| Approx. operating temperature depending on load** and environment | -100 to +250 °C | -145 to +480 °F |
The above tensile strength ranges are typical. If you require different please ask.
*Trade name of Special Metals Group of Companies
