ASTM B622 UNS N06045 Pipe (Hastelloy C-4 / Alloy C-4)
ASTM B622 UNS N06045 specifies seamless pipes and tubes made from a nickel-chromium-molybdenum alloy known as Hastelloy C-4 or Alloy C-4. This alloy is engineered for exceptional thermal stability and resistance to intergranular corrosion, even after prolonged exposure to high temperatures.
UNS N06045 pipes are highly resistant to stress corrosion cracking and maintain excellent corrosion resistance in both oxidizing and reducing chemical environments, making them ideal for demanding chemical processing applications.
Key Features
- Excellent resistance to intergranular corrosion
- Superior thermal stability at elevated temperatures
- Outstanding resistance to stress corrosion cracking
- Reliable performance in oxidizing and reducing media
- Excellent weldability without post-weld heat treatment
- Long service life in aggressive chemical services
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | N06045 |
| W.Nr | 2.4610 |
| DIN | NiMo16Cr16Ti |
| Trade Names | Hastelloy C-4, Alloy C-4 |
ASTM B622 UNS N06045 Chemical Composition
| Element | Content (%) |
|---|---|
| Nickel (Ni) | Balance |
| Chromium (Cr) | 14.0 – 18.0 |
| Molybdenum (Mo) | 14.0 – 17.0 |
| Iron (Fe) | ≤ 3.0 |
| Cobalt (Co) | ≤ 2.0 |
| Carbon (C) | ≤ 0.015 |
| Manganese (Mn) | ≤ 1.00 |
| Silicon (Si) | ≤ 0.08 |
| Phosphorus (P) | ≤ 0.02 |
| Sulfur (S) | ≤ 0.01 |
| Titanium (Ti) | ≤ 0.70 |
Hastelloy C-4 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 620 MPa (min) |
| Yield Strength (0.2% Proof) | 275 MPa (min) |
| Elongation | 40% (min) |
| Hardness | ≤ 95 HRB |
Alloy C-4 Physical Properties
| Property | Value |
|---|---|
| Density | 8.64 g/cm³ |
| Melting Range | 1320 – 1370°C |
| Thermal Conductivity | 9.7 W/m·K |
| Electrical Resistivity | 1.30 µΩ·m |
| Modulus of Elasticity | 206 GPa |
Type of ASTM B622 UNS N06045 Pipe
- UNS N06045 Seamless Pipe
- UNS N06045 Seamless Tube
- Hot Finished Pipes
- Cold Drawn Pipes
- Bright Annealed Tubes
- Chemical Process Pipes
- Heat Exchanger Tubes
Applications
- Chemical processing equipment
- High-temperature reactor systems
- Heat exchangers and condensers
- Acid recovery and reprocessing units
- Petrochemical and refinery plants
- Pulp and paper industry
- Pollution control and waste treatment systems
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