What Is Hastelloy C22 Tube? Properties, Uses & Applications

Hastelloy C22 tube is a high-performance nickel-chromium-molybdenum alloy tube (UNS N06022) designed for exceptional resistance to oxidizing acids, mixed chemical environments, and localized corrosion such as pitting and crevice corrosion. It is widely used in chemical processing, heat exchangers, pharmaceutical equipment, and pollution control systems where conventional stainless steels fail.

 

 

 

In modern industrial systems, material failure is often caused by corrosion rather than mechanical stress. Chemical plants, especially those handling aggressive acids and oxidizers, require tubing materials that can ensure long-term stability.

 

Hastelloy C22 (also known as Alloy C22) is one of the most versatile corrosion-resistant nickel alloys available today. Its balanced composition of nickel, chromium, molybdenum, and iron provides broad resistance across oxidizing and reducing environments, making it a preferred choice for critical industrial applications.

 

TSM Technology supplies ASTM B622 certified Hastelloy C22 seamless tubes, offering full traceability and custom manufacturing for global chemical industries.

 

Key Role of Elements

Chromium (Cr): Enhances oxidation resistance

Molybdenum (Mo): Improves pitting and crevice corrosion resistance

Nickel (Ni): Provides overall chemical stability

Tungsten (W): Strengthens resistance in aggressive media

 

1. Outstanding Corrosion Resistance

Hastelloy C22 is known for resisting a wide range of corrosive environments:

It performs particularly well in complex chemical environments where multiple corrosive agents are present.

 

2. Mechanical Properties

Property	Value
Tensile Strength	~690 MPa
Yield Strength	~310 MPa
Elongation	~40–45%
Hardness	Moderate
Fabricability	Excellent

These properties make C22 suitable for high-stress industrial applications while maintaining corrosion resistance.

3. Thermal Stability

Hastelloy C22 maintains stability in moderate to high temperature environments, making it suitable for:

Heat exchangers

Evaporators

Reactor tubing systems

 

 

Common industry standards include:

• ASTM B622 (Seamless tubes)
• ASTM B619 / B626 (Welded tubes)
• ASME SB622
• EN 10204 3.1 Certification

 

Testing typically includes:

• PMI testing
• Hydrostatic testing
• Ultrasonic / Eddy current testing
• Mechanical property testing

 

 

1. Chemical Processing Industry

C22 tubes are widely used in:

Acid reaction systems

Chlorination plants

Chemical transfer pipelines

Reactor cooling systems

2. Heat Exchangers

Hastelloy C22 tubes are ideal for:

Corrosive heat exchangers

Condensers

Evaporators

Cooling coils

They ensure long service life and stable heat transfer efficiency.

3. Pharmaceutical & Fine Chemical Industry

Used where high purity and corrosion resistance are required, including:

Sterile chemical processing

API manufacturing systems

Clean chemical transport lines

4. Pollution Control Systems

C22 is used in:

Flue gas scrubbers

Waste treatment systems

Acid gas neutralization units

 

 

Alloy	Corrosion Resistance	Best Application
C22	Excellent (broad spectrum)	Mixed chemical environments
C276	Excellent (chloride-heavy systems)	Harsh acid + chloride environments
316L Stainless Steel	Moderate	Mild environments only

Key takeaway:
C22 is a universal corrosion-resistant solution for mixed and oxidizing environments.

 

 

Parameter	Range
Outer Diameter	6 mm – 114.3 mm
Wall Thickness	0.5 mm – 10 mm
Length	Up to 12 meters
Surface Finish	BA / Pickled / Polished
Type	Seamless / Welded

Custom specifications are available for engineering projects.

 

 

• Exceptional corrosion resistance in mixed acids
• Strong performance in oxidizing environments
• High mechanical strength and ductility
• Long service life with low maintenance
• Suitable for complex chemical systems
• Reliable performance under harsh conditions

 

 

Q1: What is Hastelloy C22 tube used for?
It is used in chemical processing, heat exchangers, pollution control, and acid handling systems.

Q2: Is Hastelloy C22 better than stainless steel?
Yes, it offers significantly better corrosion resistance in harsh chemical environments.

Q3: Can C22 resist hydrochloric acid?
It has moderate resistance, but C276 is generally preferred for strong HCl environments.

Q4: Is C22 suitable for heat exchangers?
Yes, especially in oxidizing or mixed chemical conditions.

Q5: What is the UNS number of C22?
UNS N06022.

 

Hastelloy C22 tube is a high-performance nickel alloy solution designed for extreme chemical environments, offering excellent resistance to oxidizing acids, mixed chemicals, and localized corrosion.

 

It is widely used in chemical processing, heat exchangers, pharmaceutical systems, and environmental engineering, where reliability and long service life are critical.

 

For certified ASTM B622 Hastelloy C22 tubes, TSM Technology provides custom manufacturing, full traceability, and global supply support.

Email: info@tsm-titanium.com