ASTM B622 UNS N06002 Pipe (Hastelloy X / Alloy X / Alloy 602)
ASTM B622 UNS N06002 refers to seamless pipes manufactured from a high-temperature nickel-chromium-iron-molybdenum alloy, widely known as Hastelloy X, Alloy X, or Alloy 602. This grade delivers exceptional strength, oxidation resistance, and fabricability at elevated temperatures up to 1200°C, making it a top choice for aerospace engines, industrial furnaces, petrochemical units, and gas turbine components.
These pipes are engineered to perform in high-stress and high-temperature environments, offering long-term stability, corrosion resistance, and superior mechanical integrity.
Key Features
- Excellent oxidation resistance up to 1200°C
- High strength and stability at elevated temperatures
- Outstanding creep and rupture resistance
- Good corrosion resistance in reducing and oxidizing environments
- Superior weldability and formability
- Ideal for aerospace, furnace, petrochemical, and gas turbine systems
Available Sizes
| Size Category | Range |
|---|---|
| Outside Diameter (OD) | 6 mm to 219 mm |
| Wall Thickness | 0.7 mm to 12.7 mm |
| Length | 1 meter to 6 meters (Custom Cut Length Available) |
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | N06002 |
| W.Nr | 2.4665 |
| Trade Names | Hastelloy X, Alloy X, Alloy 602 |
ASTM B622 UNS N06002 Chemical Composition
| Element | Content (%) |
|---|---|
| Nickel (Ni) | Balance |
| Chromium (Cr) | 20.5 – 23.0 |
| Iron (Fe) | 17.0 – 20.0 |
| Molybdenum (Mo) | 8.0 – 10.0 |
| Cobalt (Co) | 0.50 – 2.50 |
| Tungsten (W) | 0.20 – 1.00 |
| Carbon (C) | 0.05 – 0.15 |
| Manganese (Mn) | ≤ 1.00 |
| Silicon (Si) | ≤ 1.00 |
| Sulfur (S) | ≤ 0.01 |
| Phosphorus (P) | ≤ 0.04 |
Hastelloy X / Alloy X (UNS N06002) Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 690 MPa (min) |
| Yield Strength (0.2% Proof) | 275 MPa (min) |
| Elongation | 30% (min) |
| Hardness | ≤ 95 HRB |
Alloy 602 UNS N06002 Physical Properties
| Property | Value |
|---|---|
| Density | 8.23 g/cm³ |
| Melting Range | 1260 – 1355°C |
| Thermal Conductivity | 11.4 W/m·K |
| Electrical Resistivity | 1.27 µΩ·m |
| Modulus of Elasticity | 205 GPa |
Type of ASTM B622 (UNS N06002) Pipe & Tube
- UNS N06002 Seamless Pipe
- UNS N06002 Seamless Tube
- Hot Finished Pipes
- Cold Drawn Pipes
- Bright Annealed Tubes
- Boiler & Heat Exchanger Tubes
- Furnace Application Tubes
Applications
- Aerospace engine components
- Gas turbine exhaust systems
- Industrial furnace equipment
- Petrochemical processing units
- Heat exchangers and reformer tubes
- High-temperature piping systems
- Combustion chambers
- Fabricated parts requiring oxidation resistance
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