ASTM B729 ALLOY 20 / UNS NO8020 Hastelloy Seamless Pipe
ASTM B729 ALLOY 20 / UNS NO8020 HASTELLOY SEAMLESS PIPE
ASTM B729 specifies the requirements for seamless pipes made from corrosion-resistant alloys, including Alloy 20 (UNS N08020). This material, classified as a nickel-iron-chromium (Ni-Fe-Cr) alloy, is specifically designed for superior corrosion resistance, especially in chemical processing environments.
Key Features of ASTM B729 Alloy 20 / UNS N08020 Pipes
-
Corrosion Resistance:
- Excellent resistance to sulfuric acid, nitric acid, and phosphoric acid.
- High resistance to pitting, crevice corrosion, and chloride ion stress-corrosion cracking.
- Ideal for environments containing strong oxidizers, organic acids, and reducing agents.
-
High-Performance Material:
- Enhanced mechanical strength due to its unique alloy composition.
- Suitable for both cryogenic and elevated-temperature applications.
-
Versatile Applications:
- Commonly used in chemical, pharmaceutical, food processing, and marine industries.
- Widely applied in heat exchangers, condensers, and storage tanks.
Alloy 20 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 % |
B729 Alloy 20 Chemical 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 |
Manufacturing Specifications for ASTM B729 Seamless Pipes
-
Standards & Dimensions:
- Manufactured under ASTM B729 standards with precise dimensional tolerances.
- Available in various sizes, wall thicknesses, and lengths as per project requirements.
-
Production Process:
- Pipes are produced by seamless hot-working methods and, if necessary, are cold-finished to achieve the desired mechanical properties and dimensions.
-
Testing & Certification:
- Includes hydrostatic testing, non-destructive testing (NDT), and chemical analysis to ensure compliance with ASTM standards.
- Certified with material test reports (MTR) containing chemical and mechanical properties.
Application of Alloy 20
- Chemical Industry: Acid tanks, piping systems, and reactors.
- Petrochemical Plants: Heat exchangers and process piping.
- Marine Applications: Seawater piping and desalination equipment.
- Pharmaceutical Equipment: For sterile and non-reactive environments.
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