ASTM B167 UNS N06693 Seamless Pipe & Tube
ASTM B167 UNS N06693, also known as Alloy 693, is an advanced nickel-chromium-aluminum alloy developed for extreme high-temperature corrosion resistance. Its high chromium and aluminum levels provide remarkable resistance to oxidation, carburization, sulfidation, and metal dusting—making Alloy 693 one of the most reliable materials for severe petrochemical and thermal processing applications. This grade maintains structural stability under prolonged exposure to temperatures above 1000°C, ensuring long service life in demanding environments.
Key Features
- Exceptional resistance to oxidation and metal dusting
- Superior carburization and sulfidation resistance at elevated temperatures
- Excellent structural stability under long-term thermal exposure
- High chromium and aluminum content for enhanced surface protection
- Strong mechanical strength in high-temperature environments
- Good weldability and fabricability
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | N06693 |
| WNR | – |
| Trade Name | Alloy 693 |
ASTM B167 UNS N06693 Chemical Composition
| Element | Content (%) |
|---|---|
| Nickel (Ni) | Balance |
| Chromium (Cr) | 27.0 – 31.0 |
| Aluminum (Al) | 2.5 – 4.0 |
| Iron (Fe) | 3.0 – 10.0 |
| Manganese (Mn) | ≤ 1.0 |
| Silicon (Si) | ≤ 0.5 |
| Copper (Cu) | ≤ 0.5 |
| Carbon (C) | ≤ 0.08 |
| Sulfur (S) | ≤ 0.015 |
| Others | Trace elements |
UNS N06693 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 650 MPa min |
| Yield Strength (0.2% Offset) | 300 MPa min |
| Elongation | 30% min |
| Hardness | ≤ 95 HRB |
ASTM B167 Alloy 693 Physical Properties
| Property | Value |
|---|---|
| Density | 8.3 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 UNS N06693 Pipes
- UNS N06693 Seamless Pipe
- UNS N06693 Seamless Tube
- Hot Finished Pipes
- Cold Drawn Tubes
- Annealed / Solution Treated Tubes
Application
- Petrochemical furnace components
- Steam reformer and syngas equipment
- High-temperature oxidation-prone environments
- Metal dusting–resistant systems
- Thermal processing & heat-treating equipment
- Incinerators and combustion systems
- Catalyst support structures
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