ASTM B167 UNS N06690 Seamless Pipe & Tube
ASTM B167 UNS N06690, widely recognized as Alloy 690, is a high-chromium nickel-based alloy engineered for outstanding corrosion resistance and superior performance in high-temperature environments. Its elevated chromium level ensures exceptional resistance to oxidizing acids, hot corrosion, and steam at elevated pressures. Alloy 690 is extensively used in nuclear steam generators, chemical processing, and high-temperature heating systems due to its robustness, mechanical strength, and stability under prolonged exposure.
Key Features
- Exceptional resistance to high-temperature oxidation and steam corrosion
- Superior resistance to acidic and alkaline environments
- High chromium content provides excellent resistance to oxidizing media
- Reliable performance in nuclear and chemical processing systems
- Good mechanical strength and metallurgical stability at elevated temperatures
- Suitable for welding, fabrication, and high-pressure applications
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | N06690 |
| WNR | 2.4642 |
| ISO / EN | NiCr30Fe |
| Trade Name | Alloy 690 |
ASTM B167 UNS N06690 Chemical Composition
| Element | Content (%) |
|---|---|
| Nickel (Ni) | ≥ 58.0 |
| Chromium (Cr) | 27.0 – 31.0 |
| Iron (Fe) | 7.0 – 11.0 |
| Manganese (Mn) | ≤ 1.0 |
| Silicon (Si) | ≤ 0.5 |
| Copper (Cu) | ≤ 0.5 |
| Carbon (C) | ≤ 0.05 |
| Sulfur (S) | ≤ 0.015 |
UNS N06690 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 620 MPa min |
| Yield Strength (0.2% Offset) | 275 MPa min |
| Elongation | 30% min |
| Hardness | ≤ 90 HRB |
Alloy 690 Physical Properties
| Property | Value |
|---|---|
| Density | 8.19 g/cm³ |
| Melting Range | 1343 – 1377°C |
| Thermal Conductivity | ~14 W/m·K |
| Electrical Resistivity | ~1.03 µΩ·m |
| Specific Heat | 0.46 J/g·K |
Type of ASTM B167 UNS N06690 Pipes
- UNS N06690 Seamless Pipe
- UNS N06690 Seamless Tube
- Hot Finished Pipes
- Cold Drawn Tubes
- Annealed / Solution Treated Tubes
Application
- Nuclear steam generator tubes
- High-temperature heating and industrial furnaces
- Chemical process industry equipment
- Heat exchangers and condenser tubing
- Steam reforming and syngas generation systems
- Power generation high-temperature components
- Corrosion-resistant boiler and superheater tubes
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