ASTM B729 Alloy 20 / UNS N08020 / 2.4660 Seamless Nickel Alloy Pipe
ASTM B407 UNS N08811 DIN 1.4959 / INCOLOY 800HT SEAMLESS ALLOY STEEL PIPE
Alloy 20 offers outstanding resistance to a wide range of corrosive media, especially sulfuric acid and other aggressive chemicals. This makes it ideal for applications in chemical manufacturing and storage. It also has good tensile strength and yield strength, contributing to its performance under different operating conditions.
Here are some key characteristics of Alloy 20 seamless Pipe:
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Chemical Composition: Typically contains nickel (32% min), chromium (19% min), molybdenum (2.5% min), along with small amounts of iron, carbon, manganese, silicon, and sulfur.
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Corrosion Resistance: Excellent resistance to sulfuric acid, phosphoric acid, and other harsh environments, making it suitable for chemical processing.
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Temperature Range: Maintains strength and stability at high temperatures, often used in environments that experience elevated thermal conditions.
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Mechanical Properties: Good mechanical strength and ductility, with yield strength typically around 30,000 psi and tensile strength around 70,000–80,000 psi.
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Weldability: Can be easily welded and fabricated, ensuring versatility in various applications.
ASTM B729 Alloy 20 Seamless Nickel Alloy Pipe Mechanical Properties
| Density | Melting Range | Yield Stress (0.2%Offset) | Tensile Stress | Elongation |
| 8.1 g/cm3 | 1443 °C (2430 °F) | Psi - 35000 , MPa - 241 | Psi - 80000 , MPa - 551 | 30 % |
ASTM B729 Alloy 20 Seamless Nickel Alloy PipeChemical Composition
| Ni | C | Mo | Mn | Si | Fe | Cu | S | P | Cr |
| 32 - 38 | 0.02 max | 2 - 3 | 1 - 2 | 0.7 max | Bal | 3 - 4 | 0.005 max | 0.02 max | 19 - 21 |
ASTM B729 Alloy 20 Seamless Nickel Alloy Pipe Equivalent Grade
| STANDARD | UNS | WERKSTOFF NR. | AFNOR | EN | JIS | BS | GOST |
| Alloy 20 | N08020 | 2.4660 | Z2NCUD31-20AZ | NiCr20CuMo | - | - | - |
Advantages of ASTM B729 Alloy 20 Seamless Nickel Alloy Pipe
- Superior Corrosion Resistance: Especially in acidic conditions, making it ideal for chemical processing.
- Versatile Applications: Suitable for a broad range of industries, including pharmaceuticals and food processing.
- Ease of Fabrication and Welding: Facilitates easier handling and assembly in construction and repairs.
- Resistance to Pitting and Crevice Corrosion: Provides reliability in harsh environments.
- Lower Cost for Specific Applications: Compared to high-nickel alloys used in high-temperature applications where Alloy 20's properties suffice.
Application
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Chemical & Petrochemical: Reactors, heat exchangers, and piping systems handling corrosive media (e.g., sulfuric acid)
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Aerospace: Combustion chambers, turbine components, and hydraulic systems due to high-temperature performance
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Marine & Energy: Seawater desalination plants, offshore oil rigs, and nuclear power systems
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Pharmaceuticals: Equipment requiring contamination-free surfaces and acid resistance
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