ASTM B725 Nickel Alloy 201 UNS N02201 Welded Pipe
ASTM B725 Nickel Alloy 201 (UNS N02201) welded pipe is a low-carbon modification of commercially pure nickel, engineered for superior resistance to caustic alkalies, neutral salts, and reducing chemicals. With reduced carbon content, Nickel 201 provides excellent thermal stability and improved resistance to graphitization at elevated temperatures, making it suitable for high-temperature and high-purity environments. Produced according to the ASTM B725 standard, these welded pipes are widely used in chemical processing, power generation, marine systems, food-grade applications, and equipment requiring high corrosion resistance and conductivity. Available in a wide range of sizes, schedules, and finishes, Nickel 201 pipes offer exceptional reliability and long-term performance.
Key Features
- Low-carbon, high-purity nickel alloy with excellent corrosion resistance
- Exceptional resistance to caustic alkalies and reducing chemicals
- Superior resistance to graphitization at elevated temperatures
- High thermal and electrical conductivity
- Excellent weldability, formability, and fabrication properties
- Suitable for high-temperature and high-purity process lines
- Available in a wide range of diameters, thicknesses, and lengths
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | N02201 |
| WNR | 2.4061 |
| BS | NA12 |
| ISO | Ni 99.2 (Low Carbon) |
| Trade Name | Nickel 201 |
Sizes
Outer Diameter (OD)
- From 6 mm (1/4″ NB) up to 914.4 mm (30″ NPS)
Wall Thickness (WT)
- Available in 5S, 10S, 40S, 80S, 160, XXS and other schedules
- Thickness range from 0.3 mm to 50 mm or more, depending on OD and schedule
Length Options
- Supplied in Single Random (SRL), Double Random (DRL)
- Custom lengths up to 13,500 mm (approx. 44 feet) available on request
ASTM B725 Alloy 201 UNS N02201 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Nickel (Ni) | ≥ 99.0 |
| Iron (Fe) | ≤ 0.40 |
| Manganese (Mn) | ≤ 0.35 |
| Carbon (C) | ≤ 0.02 |
| Silicon (Si) | ≤ 0.35 |
| Copper (Cu) | ≤ 0.25 |
| Sulfur (S) | ≤ 0.01 |
ASTM B725 Alloy 201 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 370 MPa |
| Yield Strength (0.2% Offset) | ≥ 105 MPa |
| Elongation | ≥ 40% |
| Hardness | ≤ 65 HRB |
Nickel 201 Physical Properties
| Property | Value |
|---|---|
| Density | 8.89 g/cm³ |
| Melting Point | 1435 – 1446°C |
| Electrical Resistivity | 0.099 μΩ·m |
| Thermal Conductivity | 91 W/m·K |
| Modulus of Elasticity | 205 GPa |
Type of Alloy 201 Pipes
- ASTM B725 Nickel 201 Welded Pipes
- Welded & Annealed Pipes
- Large Diameter Welded Pipes
- Custom Fabricated Nickel Alloy 201 Welded Pipes
Applications
- High-temperature caustic alkali processing
- Chemical and petrochemical equipment
- High-purity processing systems
- Marine and seawater piping
- Food-grade equipment
- Heat exchangers, condensers, and evaporators
- Electrical and thermal components
- Power generation and environmental systems
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