Seamless Hastelloy C22 Tube (UNS N06022 / 2.4602) – Versatile Nickel Alloy for Extreme Corrosion Resistance
Overview of Seamless Hastelloy C22 Tube
Seamless Hastelloy C22 tube (UNS N06022 / W.Nr. 2.4602) is a high-performance nickel–chromium–molybdenum–tungsten alloy, engineered to deliver exceptional corrosion resistance in both oxidizing and reducing environments.
Manufactured from solid billets through hot piercing and cold finishing, seamless C22 tubes feature a uniform, weld-free microstructure, ensuring superior mechanical strength, pressure resistance, and long-term reliability in critical applications.
Recognized as one of the most versatile corrosion-resistant nickel alloys, Hastelloy C22 is widely used in complex chemical processes where media conditions vary or are highly aggressive.
Key Technical Advantages
- Outstanding Universal Corrosion Resistance
Excellent resistance to a wide range of aggressive media, including ferric and cupric chlorides, chlorine, contaminated acids, and organic/inorganic solutions. - Superior Resistance to Localized Corrosion
High chromium (~22%) and molybdenum (~13%) content ensures excellent resistance to pitting and crevice corrosion, especially in chloride-containing environments. - Excellent Immunity to Stress Corrosion Cracking (SCC)
Nickel-rich composition provides near-complete resistance to chloride-induced SCC. - Strong Performance in Mixed Chemical Environments
Performs reliably in both oxidizing and reducing acids such as nitric acid, sulfuric acid, and hydrochloric acid. - Weld Zone Stability
Resistant to grain boundary precipitation in the heat-affected zone (HAZ), maintaining corrosion resistance in as-welded conditions. - Thermal Stability
Maintains mechanical properties and corrosion resistance at elevated temperatures, suitable for harsh industrial systems such as FGD units.
Product Specifications & Technical Data
The addition of Tungsten (W) specifically enhances its resistance to pitting in halide-containing environments.
Hastelloy C22 is specifically designed to maintain its strength and shape in high-stress, corrosive environments.
These physical properties highlight the material’s ability to perform reliably under a wide range of conditions.
Industrial Applications
Seamless Hastelloy C22 tubes are widely used in industries requiring extreme corrosion resistance:
Chemical Processing Industry
Reactors, heat exchangers, and piping systems handling nitric, sulfuric, and hydrochloric acids
Environmental & FGD Systems
Flue gas desulfurization (FGD) scrubbers, absorbers, ducting, and stack liners
Pharmaceutical & Biotechnology
High-purity process piping where contamination must be minimized
Marine & Offshore Engineering
Seawater handling systems and subsea equipment exposed to highly corrosive environments
Quality Assurance & Inspection
To meet stringent project requirements, all seamless Hastelloy C22 tubes undergo comprehensive quality control:
- Material Certification
EN 10204 3.1 / 3.2 Mill Test Certificate (MTC)
Full traceability from raw material to finished product - Non-Destructive Testing (NDT)
- Positive Material Identification (PMI)
- Eddy Current Testing (ET)
- Ultrasonic Testing (UT)
- Hydrostatic Testing (HT)
- Mechanical & Corrosion Testing
- Intergranular Corrosion (IGC) Test
- Pitting Corrosion Test
- Flattening & Flaring Tests
- Grain size analysis
- Third-Party Inspection Available
ABS, DNV, BV, TÜV, SGS, Lloyd’s Register
