ASTM B167 UNS N06603 Seamless Pipe & Tube
Introduction
ASTM B167 UNS N06603, known as Alloy 603, is a high-performance nickel-chromium-aluminum alloy engineered for extreme oxidation resistance and durability at elevated temperatures. Its enhanced aluminum content provides excellent surface stability, scaling resistance, and extended service life in thermal processing environments. Alloy 603 is widely used in furnace systems, heat-treat equipment, incinerators, and other applications where continuous high-temperature exposure demands exceptional reliability.
Key Features
- Exceptional resistance to oxidation at elevated temperatures
- Excellent performance in carburizing and chlorinated atmospheres
- Stable oxide film formation due to enriched aluminum content
- High mechanical strength at elevated temperatures
- Outstanding resistance to thermal fatigue and cyclic heating
- Good fabricability and weldability
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | N06603 |
| WNR | – |
| EN | – |
| ISO | – |
| Trade Name | Alloy 603 |
ASTM B167 UNS N06603 Chemical Composition
| Element | Content (%) |
|---|---|
| Nickel (Ni) | Balance |
| Chromium (Cr) | 22.0 – 25.0 |
| Aluminum (Al) | 2.0 – 4.0 |
| Iron (Fe) | Up to 3.0 |
| Manganese (Mn) | ≤ 1.0 |
| Silicon (Si) | ≤ 0.5 |
| Copper (Cu) | ≤ 0.5 |
| Carbon (C) | ≤ 0.10 |
| Others | Trace elements |
UNS N06603 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 600 MPa min |
| Yield Strength | 240 MPa min |
| Elongation | 30% min |
| Hardness | ≤ 85 HRB |
ASTM B167 Alloy 603 Physical Properties
| Property | Value |
|---|---|
| Density | 8.0 g/cm³ |
| Melting Range | ~1350 – 1400°C |
| Thermal Conductivity | ~12–15 W/m·K |
| Electrical Resistivity | ~1.1 µΩ·m |
| Specific Heat | ~0.44 J/g·K |
Type of ASTM B167 UNS N06603 Pipes
- UNS N06603 Seamless Pipe
- UNS N06603 Seamless Tube
- Hot Finished Pipes
- Cold Drawn Tubes
- Annealed / Solution Treated Tubes
Application
- Furnace muffles and heat-treat fixtures
- High-temperature industrial heating systems
- Thermal oxidizers and incinerators
- Heat shields and radiant tubes
- Petrochemical high-temperature processing
- Power generation components exposed to extreme heat
- Gas turbine support structures
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