Nickel Alloy C-22 / Hastelloy® C-22 – Properties, Applications and Technical Data
Alloy C-22, also known as Hastelloy® C-22, is an advanced nickel-chromium-molybdenum-tungsten alloy (UNS N06022 / Werkstoffnr 2.4602) developed for extreme corrosion resistance in aggressive chemical environments. The material is considered one of the most corrosion-resistant nickel-based alloys on the market and is used where maximum operational reliability and service life are required.
Alloy C-22 is typically supplied as sheet, bar, tube and forgings for use in the chemical process industry, environmental technology, offshore, energy and advanced industrial systems.
Properties of Alloy C-22
Alloy C-22 combines high chromium content with molybdenum and tungsten, which provides superior resistance to pitting corrosion, crevice corrosion and stress corrosion cracking in chloride-containing environments.
The low carbon and silicon content minimizes the risk of intergranular corrosion after welding, making the alloy particularly suitable for welded structures in aggressive process environments.
Type: Nickel-Chromium-Molybdenum-Tungsten Alloy
Alloy: Ni-Cr-Mo-W (Alloy C-22 / Hastelloy® C-22)
Structure: Austenitic nickel-based alloy
UNS: N06022
Werkstoffnr: 2.4602
Standards: ASTM B574, ASTM B575, ASTM B619, ASTM B622, ASTM B366
Advantages
- Exceptional resistance to pitting and crevice corrosion
- Very good resistance to chlorides and chloride-containing process media
- Resistant to both oxidizing and reducing acids
- Superior weldability compared to many other nickel-base alloys
- Long service life in aggressive chemical environments
Limitations
- Higher material cost than standard stainless steels
- Not intended for extremely high temperatures above the material's design limit
- May be more demanding to machine than simpler alloys
Typical applications
Chemical process industry
Reactors, heat exchangers, columns, transfer pipes and process equipment in highly corrosive environments.
Environmental and flue gas purification
Scrubbers, ducts, dampers, fans and components for flue gas cleaning systems.
Oil & Gas
Components in chloride-containing and acidic environments with high requirements for corrosion resistance.
Energy & Power Generation
Equipment in systems where temperature and aggressive media are combined.
Corrosion resistance
Alloy C-22 is developed to resist a very wide range of aggressive chemicals, including chlorides, wet chlorine gas, strong acids and mixed oxidizing/reducing environments.
The high chromium content improves resistance in oxidizing systems while molybdenum and tungsten strengthen the alloy's resistance in reducing acids.
Environments where Alloy C-22 performs well
- Chloride-rich process environments
- Oxidizing and reducing acids
- Flue gas cleaning and waste management
- Chemical process equipment
Environments to avoid
- Applications where simpler materials provide adequate performance
- Temperatures above the material's recommended operating range
Technical data (annealed condition)
| Yield strength (0.2%) |
~310 MPa |
| Tensile strength |
~690 MPa |
| Elongation at break |
~40–45% |
| Density |
~8.69 g/cm³ |
| Modulus of elasticity |
~205 GPa |
| Recommended maximum temperature |
≤1250°C (oxidation) |
| Weldability |
Very good – recommended filler material ERNiCrMo-10 |
With a global network of reliable suppliers, we offer customized solutions and fast access to Alloy C-22 in various shapes and dimensions.
Contact us if you need technical advice or a quote – we will help you find the right nickel-based superalloy for your application.
Buy Alloy C-22 from HARALD PIHL – your specialist in corrosion-resistant nickel materials with global delivery.
Our strengths
- ISO 9001 and AS9120 certified quality management
- Full traceability according to EN 10204 3.1
- Materials according to ASTM, ASME and international standards
- Cutting and adaptation according to drawing
- Fast global delivery
