ASTM B622 UNS N06022 Pipe (Hastelloy C-22 / Alloy C22)
ASTM B622 UNS N06022 refers to seamless pipes manufactured from a nickel-chromium-molybdenum alloy commonly known as Hastelloy C-22 or Alloy C22. This alloy is recognized for its exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking in both oxidizing and reducing environments.
UNS N06022 pipes are widely used in chemical processing, pollution control, pharmaceutical, and marine industries where extreme corrosion resistance and long service life are critical.
Key Features
- Outstanding resistance to pitting and crevice corrosion
- Excellent performance in oxidizing and reducing media
- Superior resistance to stress corrosion cracking
- High mechanical strength and toughness
- Excellent weldability and fabrication characteristics
- Performs reliably in aggressive chemical environments
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | N06022 |
| W.Nr | 2.4602 |
| DIN | NiCr21Mo14W |
| Trade Names | Hastelloy C-22, Alloy C22 |
ASTM B622 UNS N06022 Chemical Composition
| Element | Content (%) |
|---|---|
| Nickel (Ni) | Balance |
| Chromium (Cr) | 20.0 – 22.5 |
| Molybdenum (Mo) | 12.5 – 14.5 |
| Iron (Fe) | 2.0 – 6.0 |
| Tungsten (W) | 2.5 – 3.5 |
| Cobalt (Co) | ≤ 2.5 |
| Carbon (C) | ≤ 0.015 |
| Manganese (Mn) | ≤ 0.50 |
| Silicon (Si) | ≤ 0.08 |
| Phosphorus (P) | ≤ 0.02 |
| Sulfur (S) | ≤ 0.02 |
ASTM B622 Hastelloy C-22 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 690 MPa (min) |
| Yield Strength (0.2% Proof) | 310 MPa (min) |
| Elongation | 45% (min) |
| Hardness | ≤ 95 HRB |
Alloy C22 Physical Properties
| Property | Value |
|---|---|
| Density | 8.69 g/cm³ |
| Melting Range | 1325 – 1370°C |
| Thermal Conductivity | 10.1 W/m·K |
| Electrical Resistivity | 1.30 µΩ·m |
| Modulus of Elasticity | 206 GPa |
Type of ASTM B622 UNS N06022
- UNS N06022 Seamless Pipe
- UNS N06022 Seamless Tube
- Hot Finished Pipes
- Cold Drawn Pipes
- Bright Annealed Tubes
- Heat Exchanger Tubes
- Chemical Processing Pipes
Applications
- Chemical processing equipment
- Pharmaceutical and biotech plants
- Pollution control and waste treatment systems
- Heat exchangers and condensers
- Marine and offshore piping systems
- Pulp and paper industry
- Petrochemical and refinery units
- Acid handling and corrosion-critical services
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