Alloy 22
UNS N06022
Description
Alloy 22 is a fully austenitic, nickel-chromium-molybdenum alloy with better overall corrosion resistance compared to other nickel-chromium-molybdenum alloys, including alloy C-276, alloy C4 and alloy 625. It exhibits excellent resistance to both oxidising and reducing acid environments as well as those containing mixed acids due to the addition of high chromium content and molybdenum and tungsten content. It also has exceptional resistance to a large range of chemical process environments, including ferric chlorides, chlorine, hot contaminated solutions, acetic acids, seawater and brine solutions. Thus, Alloy 22 is the ideal choice when considering alloys for use in extreme corrosive environments such as chemical/petrochemical processing, pollution control (flue gas desulfurization), power, marine, pulp and paper processing, and waste disposal industries.
Chemical Component
| Ni | Cr | Mo | Fe | W | Co | C | Mn | Si | V | P | S |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Balance | 20-22.5% | 12.5-14.5% | 2-6% | 2.5-3.5% | 2.5% max | 0.015% max | 0.5% max | 0.08% max | 0.35% max | 0.02% max | 0.02% max |
Basic Information
| Items | Alloy 22 |
|---|---|
| Catalog | ACMA-Ni-A007 |
| Density | 8.61 g/cm3 |
| Hardness | 89 HRB |
| Specific Heat Capacity | 381 J/kg.°C |
| Electrical Resistivity | 1.215 µΩ.m |
| Curie Temperature | < -196 °C |
| Melting Range | 1351-1387 °C |
| Poisson's Ratio | 0.3 |
Material Forms
Alfa Chemistry offers Alloy 22 in a variety of forms, including
- Welding Wire
- Sheet & Plate
- Round Tubing
- Round Bar
- Pipe
- Pipe Fittings
- Flanges
Mechanical & Physical Properties
| Properties | -196 °C | 20 °C | 100 °C | 200 °C | 300 °C | 400 °C |
|---|---|---|---|---|---|---|
| Ultimate Tensile Strength for sheet ≤ 50 mm thick, MPa | - | 690-950 | - | - | - | - |
| Ultimate Tensile Strength for bar ≤ 90 mm thick, MPa | - | 690-951 | - | - | - | - |
| 0.2% Yield Strength for sheet ≤ 50 mm thick, MPa | - | 310 | 270 | 225 | 195 | 175 |
| 0.2% Yield Strength for bar ≤ 90 mm thick, MPa | - | 310 | 290 | 245 | 215 | 195 |
| Elongation, % for sheet ≤ 50 mm thick | - | 45 | - | - | - | - |
| Elongation, % for bar ≤ 90 mm thick | - | 45 | - | - | - | - |
| Charpy Impact V-notch men value, J | 96 | 120 | - | - | - | - |
| Thermal Conductivity, kcal/(hr.m.°C) | - | 10.1 | 11.1 | 13.4 | 15.5 | 17.5 |
| Modulus of Elasticity, 105 MPA | - | 2.05 | - | 1.97 | - | 1.85 |
Specifications
Applications
Alloy 22 can be used in a variety of applications, including:
- Reactors and pressure vessels
- Nutsche pressure filters
- Centrifugers and dryers
- Agitators and mixers
- Containment vessels and glove boxes
- Pollution control equipment
- Flue gas desulphurization (FGD) lined ducts and dampers
Among the many applications, Alloy 22 is most suitable for chemical processing industry.
* Technical data included herein should be used as a guideline only, and should not be construed as maximum or minimum values for specification or for final design, or for a particular use or application. The data may be revised anytime without notice.
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