ASTM B423 UNS N06845 Seamless Pipe & Tube
ASTM B423 UNS N06845 is a high-performance nickel-iron-chromium alloy, commonly associated with the Incoloy 825 family, engineered for seamless pipes and tubes operating in aggressive corrosive environments. This alloy delivers exceptional resistance to a wide range of aggressive acids and offers strong protection against stress-corrosion cracking due to its balanced nickel and chromium content. Manufactured under the ASTM B423 standard, UNS N06845 pipes and tubes are widely used across chemical processing, petrochemical systems, and offshore installations, where reliability, stability, and material integrity are critical. Available in multiple tempers and surface conditions, this grade supports diverse industrial applications requiring long-term performance in demanding operating conditions.
Key Features
- Excellent corrosion resistance in acids, chlorides, and seawater
- High resistance to stress-corrosion cracking and pitting
- Stable mechanical properties at elevated temperatures
- Exceptional durability and long service life in harsh environments
- Suitable for high-temperature, high-pressure, and corrosive service
- High weldability and good fabrication characteristics
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | N06845 |
| EN | Nickel Alloy (Equivalent UNS Family Reference) |
| Trade Name | High-Performance Nickel Alloy |
Sizes
- Pipes: 1/8” IPS to 48” OD
- Tubes: 3 mm to 600 mm OD
- Wall Thickness: 0.5 mm to 30+ mm, depending on schedule
- Schedules: SCH 5, 10, 40, 80, 120, 160, XXS
- Lengths: SRL / DRL / Custom Cut with ±3.5 ft tolerance
ASTM B423 UNS N06845 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Nickel (Ni) | 45.0 – 55.0 |
| Chromium (Cr) | 19.0 – 23.0 |
| Iron (Fe) | Balance |
| Molybdenum (Mo) | 2.5 – 3.5 |
| Copper (Cu) | 1.0 – 3.0 |
| Titanium (Ti) | 0.6 – 1.2 |
| Carbon (C) | ≤ 0.05 |
| Manganese (Mn) | ≤ 1.0 |
| Silicon (Si) | ≤ 0.5 |
| Sulfur (S) | ≤ 0.03 |
UNS N06845 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 550 MPa |
| Yield Strength (0.2% Offset) | ≥ 220 MPa |
| Elongation | ≥ 30% |
| Hardness | ≤ 200 HB |
Incoloy 825 Physical Properties
| Property | Value |
|---|---|
| Density | 8.10 g/cm³ |
| Melting Range | 1350 – 1400°C |
| Thermal Conductivity | 11 W/m·K at 20°C |
| Electrical Resistivity | 1.05 – 1.15 μΩ·m |
| Modulus of Elasticity | 195 GPa |
Type of ASTM B423 UNS N06845 Pipe
- UNS N06845 Seamless Pipes
- UNS N06845 Seamless Tubes
- Cold Drawn Tubes
- Hot Finished Pipes
- Heat Exchanger & Condenser Tubes
Applications
- Chemical processing plants
- Heat exchangers and pressure vessels
- Oil & gas offshore piping systems
- Marine and seawater equipment
- Petrochemical and refinery piping
- Pollution control and acid handling systems
- High-temperature equipment
- Nuclear and power generation components
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