ASTM B622 Hastelloy B2 Welded Pipe, 4" SCH 60
ASTM B622 Hastelloy B2 Welded Pipe, 4" SCH 60 refers to a welded pipe made of Hastelloy B2 alloy, conforming to the ASTM B622 specification, with a nominal pipe size of 4 inches and a Schedule 60 wall thickness.
This pipe is constructed using Hastelloy B2, which is a nickel-molybdenum alloy known for its exceptional resistance to a wide range of corrosive environments, including reducing acids and stress-corrosion cracking.
The Schedule 60 designation indicates the thickness of the pipe's wall, with SCH 60 pipes having thicker walls compared to pipes with lower schedule numbers.
Chemical Composition (Typical):
| Element | Composition (%) |
|---|---|
| Nickel (Ni) | 65.0 min |
| Molybdenum (Mo) | 26.0-30.0 |
| Iron (Fe) | 2.0 max |
| Chromium (Cr) | 1.0 max |
| Cobalt (Co) | 1.0 max |
| Manganese (Mn) | 1.0 max |
| Silicon (Si) | 0.10 max |
| Carbon (C) | 0.02 max |
| Phosphorus (P) | 0.04 max |
| Sulfur (S) | 0.03 max |
Mechanical Properties (Typical):
Tensile Strength: 110 ksi (760 MPa) min
Yield Strength (0.2% offset): 51 ksi (350 MPa) min
Elongation: 40% min
Production Process:
The production process involves forming the flat-rolled alloy into pipes through a welding process.
Automatic welding methods are commonly employed, and pipes can be produced with or without filler metal.
Advantages:
Excellent resistance to a wide range of corrosive environments, including reducing acids and stress-corrosion cracking.
High strength and toughness even at elevated temperatures.
Good fabricability and weldability.
Common Questions:
Q: What are the typical applications of ASTM B622 Hastelloy B2 Welded Pipes?
A: These pipes are commonly used in chemical processing, petrochemical, and pharmaceutical industries where resistance to reducing acids and stress-corrosion cracking is required.
Q: Can ASTM B622 Hastelloy B2 Welded Pipes be used in high-temperature applications?
A: Yes, Hastelloy B2 exhibits good mechanical properties and corrosion resistance at elevated temperatures, making it suitable for high-temperature applications.
Q: What precautions should be taken during the welding of ASTM B622 Hastelloy B2 Welded Pipes?
A: Proper welding procedures should be followed to maintain the corrosion resistance and mechanical properties of the alloy. Precautions should be taken to avoid contamination from carbon steel or other materials during welding.
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