ASTM B167 UNS N06674 Pipe & Tube
ASTM B167 UNS N06674 is a high-performance nickel-based alloy designed for superior strength, oxidation resistance, and long-term stability at elevated temperatures. Known for its excellent resistance to carburization, hot corrosion, and aggressive furnace atmospheres, UNS N06674 pipes and tubes manufactured under ASTM B167 are widely used in high-temperature industrial processes, petrochemical units, and heat-treating systems. The alloy provides consistent mechanical performance and dimensional stability under continuous thermal exposure.
Key Features
- Exceptional strength at high temperatures
- Outstanding oxidation resistance up to extreme heat levels
- Superior resistance to carburization and hot corrosion
- Stable mechanical properties during long-term thermal exposure
- Excellent resistance to chemical attack in mixed environments
- Offered in seamless and welded configurations
- Suitable for demanding high-temperature industrial systems
Equivalent Grades
| Standard | Equivalent |
|---|---|
| UNS | N06674 |
| Trade Name | High-Temperature Ni-Cr Alloy |
| Werkstoff | – |
| Other Equivalents | Heat-Resistant Nickel Alloys |
Available Sizes
- Pipe OD: 6 mm to 914.4 mm
- Tube OD: 3 mm to 600 mm
- Wall Thickness: 0.3 mm to 50 mm+
- Length: Up to 13.5 meters (SRL / DRL / Custom)
ASTM B167 UNS N06674 Chemical Composition
| Element | % |
|---|---|
| Nickel (Ni) | Balance |
| Chromium (Cr) | 20.0 – 26.0 |
| Molybdenum (Mo) | 8.0 – 10.0 |
| Cobalt (Co) | 5.0 – 10.0 |
| Aluminum (Al) | 0.3 – 1.2 |
| Titanium (Ti) | 0.2 – 0.6 |
| Carbon (C) | ≤ 0.15 |
| Manganese (Mn) | ≤ 1.0 |
| Silicon (Si) | ≤ 1.0 |
| Sulfur (S) | ≤ 0.015 |
| Iron (Fe) | ≤ 5.0 |
UNS N06674 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 700 – 850 MPa |
| Yield Strength (0.2% Proof) | 300 – 400 MPa |
| Elongation | ≥ 30% |
| Hardness | ≤ 95 HRB |
UNS N06674 Physical Properties
| Property | Value |
|---|---|
| Density | ~8.2 g/cm³ |
| Melting Range | ~1320 – 1400°C |
| Thermal Conductivity | ~12 W/m·K |
| Electrical Resistivity | ~1.1 µΩ·m |
| Specific Heat | ~450 J/kg·K |
Type of UNS N06674 Pipes
- Seamless Pipes
- Welded Pipes
- Seamless Tubes
- Welded Tubes
- Furnace Tubes
- High-Temperature Industrial Tubing
Application
- High-temperature furnace systems
- Power generation & turbine components
- Petrochemical & refinery heaters
- Industrial heat-treating equipment
- Chemical processing units
- Exhaust systems & incinerators
- Thermal oxidation systems
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