Hastelloy C22
Hastelloy C22 is a nickel based corrosion resistant alloy with about 56% nickel, 22% to 24% chromium, 12.5% to 14.5% molybdenum, and 2.5% to 3.5% tungsten. Carbon is limited to ≤0.015%. The alloy resists oxidizing and reducing acids, mixed acid systems, pitting, crevice corrosion, and stress corrosion cracking. It is used in chloride bearing chemical processes, alkylation equipment, flue gas desulfurization systems, and pharmaceutical equipment. The source lists continuous service up to 1000℃ and conventional TIG or MIG welding with controlled heat input.
Product details
Chemical composition
| HastelloyC22 | C | Si | Mn | P | S | Ni | Cr | Mo | Fe | W | V | CO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| min | – | – | – | – | – | – | 20.0 | 12.5 | 2.0 | 2.5 | – | – |
| max | 0.015 | 0.08 | 0.5 | 0.02 | 0.02 | Bal | 22.5 | 14.5 | 6.0 | 3.5 | 0.35 | 2.5 |
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Grade equivalents
| English Item | UNS | W.Nr. | JIS | GB/T | Other Grades |
|---|---|---|---|---|---|
| Hastelloy C22 HC22 Alloy C22 | N06022 | 2.4602 Nicrofer 5621 hMoW | NW6022 | NS338 NS3308 | NiCr21Mo14W 55Ni-21Cr-13.5Mo |
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Physical properties
| Density g/cm³ | 8.9 |
|---|---|
| Melting range ℃ | 1325~1370 |
| Thermal conductivity (100℃) λ/(W/m•℃) | 9.8 |
| Specific heat J/kg•℃ | 427 |
| Elastic modulus GPa | 210 |
| Shear modulus GPa | 72 |
| Electrical resistivity μΩ•m | 1.05 |
| Linear expansion coefficient a/10-6℃-1 | 11.2(20~100℃) |
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Mechanical properties
| Tensile strength Rm N/mm | ≥690 |
|---|---|
| Yield strength RP0.2 N/mm | ≥283 |
| Elongation % | ≥30 |
| Hardness HB | ≤200 |
| *After solution heat treatment | |
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Applications
- Chemical reactors and vessels
- Petroleum refining equipment
- Flue gas desulfurization (FGD) systems
- Pharmaceutical and food-processing machinery
- Environmental protection and wastewater treatment equipment
- Aerospace components
- Marine engineering facilities
Available product forms
- Round Bar
- Wire
- Forgings
- Plate
- Strip
- Seamless Pipe
- Welded Pipe
- Capillary Tube
- Flanges
- Pipe Fittings
- Non-standard Custom Parts
Values follow the Milike materials catalogue and are provided for preliminary review. Confirm the applicable purchase specification, heat treatment condition, and inspection requirements before final material selection.
- Heat and batch traceability
- PMI testing available
- Cut-to-size processing
- Material certificates on request
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