# Alloy C22 UNS N06022: Properties and Applications
## Introduction to Alloy C22
Alloy C22, also known as UNS N06022, is a nickel-chromium-molybdenum-tungsten alloy designed to resist a wide range of corrosive environments. This advanced material offers exceptional resistance to both oxidizing and reducing media, making it one of the most versatile corrosion-resistant alloys available today.
## Chemical Composition
The chemical composition of Alloy C22 is carefully balanced to provide optimal performance:
– Nickel (Ni): 56% (base element)
– Chromium (Cr): 22%
– Molybdenum (Mo): 13%
– Tungsten (W): 3%
– Iron (Fe): 3% max
– Cobalt (Co): 2.5% max
– Carbon (C): 0.015% max
– Other elements in smaller quantities
## Key Properties of Alloy C22
### Corrosion Resistance
Alloy C22 exhibits outstanding resistance to:
– Pitting and crevice corrosion
– Stress corrosion cracking
– Intergranular attack
– Oxidizing and reducing environments
### Mechanical Properties
Typical mechanical properties at room temperature include:
– Tensile strength: 690 MPa (100 ksi)
– Yield strength: 310 MPa (45 ksi)
Keyword: Alloy C22 UNS N06022
– Elongation: 45%
– Hardness: 90 HRB
### Thermal Properties
Alloy C22 maintains its properties at elevated temperatures:
– Melting range: 1325-1370°C (2420-2500°F)
– Maximum service temperature: 600°C (1112°F) in oxidizing environments
## Applications of Alloy C22
Due to its exceptional properties, Alloy C22 finds applications in numerous industries:
### Chemical Processing Industry
– Reactors and vessels
– Heat exchangers
– Piping systems
– Flue gas desulfurization systems
### Pharmaceutical Industry
– Process equipment
– Storage tanks
– Transfer systems
### Oil and Gas Industry
– Downhole components
– Valves and fittings
– Offshore platform components
### Pollution Control
– Scrubbers
– Waste treatment systems
– Chimney liners
## Fabrication and Welding
Alloy C22 can be fabricated using standard techniques:
– Hot working: 925-1205°C (1700-2200°F)
– Cold working: Annealed condition recommended
– Welding: Performed using matching filler metal (ERNiCrMo-10)
## Comparison with Other Alloys
Alloy C22 offers several advantages over similar materials:
– Superior to Alloy C276 in many corrosive environments
– Better resistance to localized corrosion than Alloy 625
– More versatile than titanium in chemical processing applications
## Conclusion
Alloy C22 UNS N06022 represents a significant advancement in corrosion-resistant materials. Its balanced composition provides exceptional performance across a wide range of aggressive environments, making it an excellent choice for demanding applications in chemical processing, oil and gas, and other industries where corrosion resistance is critical.
