ASTM B167 UNS N06696 Seamless Pipe & Tube
ASTM B167 UNS N06696, marketed as Alloy 696, is a high-temperature nickel-chromium alloy engineered for extreme oxidation resistance, outstanding carburization resistance, and superior performance in metal-dusting environments. The alloy’s high chromium and aluminum content enhances surface stability during prolonged exposure above 1000°C, making it an ideal choice for petrochemical, thermal processing, and furnace-related applications. Alloy 696 ensures long operating life in aggressive high-temperature service where standard alloys fail.
Key Features
- Exceptional resistance to oxidation at elevated temperatures
- High resistance to carburization and metal dusting
- Strong mechanical stability under long exposure above 1000°C
- High chromium and aluminum levels for superior surface protection
- Excellent performance in petrochemical and thermal processing systems
- Good weldability and formability for industrial fabrication
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | N06696 |
| WNR | – |
| Trade Name | Alloy 696 |
ASTM B167 UNS N06696 Chemical Composition
| Element | Content (%) |
|---|---|
| Nickel (Ni) | Balance |
| Chromium (Cr) | 28.0 – 31.5 |
| Aluminum (Al) | 1.0 – 4.0 |
| Iron (Fe) | 4.0 – 10.0 |
| Manganese (Mn) | ≤ 1.0 |
| Silicon (Si) | ≤ 0.5 |
| Copper (Cu) | ≤ 0.5 |
| Carbon (C) | ≤ 0.08 |
| Sulfur (S) | ≤ 0.015 |
UNS N06696 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 690 MPa min |
| Yield Strength (0.2% Offset) | 310 MPa min |
| Elongation | 28% min |
| Hardness | ≤ 96 HRB |
ASTM B167 Alloy 696 Physical Properties
| Property | Value |
|---|---|
| Density | 8.2 g/cm³ |
| Melting Range | ~1350 – 1400°C |
| Thermal Conductivity | ~12–15 W/m·K |
| Electrical Resistivity | ~1.05 µΩ·m |
| Specific Heat | ~0.46 J/g·K |
Type of ASTM B167 UNS N06696 Pipes
- UNS N06696 Seamless Pipe
- UNS N06696 Seamless Tube
- Hot Finished Pipes
- Cold Drawn Tubes
- Annealed / Solution Treated Tubes
Application
- Petrochemical furnace tubes and reformer components
- High-temperature carburizing environments
- Metal dusting–resistant equipment
- Thermal processing and heat-treating systems
- Steam reforming and synthesis gas equipment
- Incineration and high-temperature combustion systems
- Critical high-temperature tubing in chemical industries
Reviews
There are no reviews yet.