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 |
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 |
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℃) |
Mechanical properties
| Tensile strength Rm N/mm | ≥690 |
|---|---|
| Yield strength RP0.2 N/mm | ≥283 |
| Elongation % | ≥30 |
| Hardness HB | ≤200 |
| *After solution heat treatment | |
Available product forms
- Round Bar
- Plate
- Pipe & Tube
- Welding Consumables
- Flanges
- Hex Bolts
- Threaded Rod
- Nuts & Washers
Technical values are transcribed and translated from the supplied Milike Chinese catalogue. Confirm the applicable purchase specification, heat treatment condition, and inspection requirements before final material selection.
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