ASTM B729 Alloy 20 Seamless Tubes
Cold-Drawn Precision Tubes for Demanding Thermal Applications
Material & Performance Highlights
Alloy 20 (UNS N08020) is a nickel-iron-chromium superalloy renowned for its exceptional resistance to sulfuric acid, chloride stress corrosion, and oxidizing environments. Ideal for heat exchangers, boilers, and chemical processing systems operating under extreme conditions.
Key Features
| Property | Value |
| Standards | ASTM B729, ASME SB729, EN 10216-5 |
| Outer Diameter | 6mm – 150mm (Custom Sizes Available) |
| Wall Thickness | 1mm – 20mm |
| Surface Finish | Cold-Drawn, Annealed, Pickled & Passivated |
Mechanical Properties
| Property | Minimum Value |
| Tensile Strength | 620 MPa |
| Yield Strength | 300 MPa |
| Elongation (%) | 30% |
| Hardness (Rockwell B) | ≤ 100 HRB |
Chemical Composition (%)
| Element | Ni | Cr | Fe | Mo | Cu | C | Mn | Si |
| ASTM B729 | 32-38 | 19-21 | Bal. | 2-3 | 3-4 | ≤0.07 | ≤2.0 | ≤1.0 |
Manufacturing Process
Raw Material Control: Sourced from ISO-certified mills.
Cold Drawing: Enhances dimensional accuracy (±0.05mm) and surface integrity.
Solution Annealing: 1050°C – 1150°C for stress relief and corrosion resistance.
NDT Testing: 100% Eddy Current, Hydrostatic, and Ultrasonic Inspection.
Applications
✅ Heat Exchanger Bundles in Petrochemical Plants
✅ Boiler Superheaters & Condensers
✅ Sulfuric Acid Concentration Systems
✅ Pharmaceutical Reactor Cooling Loops
Why Choose YUHONG’s Alloy 20 Tubes?
55 Production Lines: Guarantee 15-day lead time for bulk orders.
Zero Leakage Warranty: Backed by EN 10204 3.1 Certification.
Customization: Laser-cut threads, flared ends, or pre-bent shapes.
FAQ
Q: How does Alloy 20 compare to 316L in chloride environments?
A: Alloy 20 offers 3x higher pitting resistance per ASTM G48 testing.
Q: Maximum service temperature?
A: 550°C (1022°F) for continuous operation.
Q: MOQ for customized sizes?
A: 500 kg with flexible packaging (Wooden Crates/Plastic Caps).
About YUHONG Holding Group
With 20+ years as a top 5 Chinese finned tube exporter, YUHONG serves 80+ countries through:
55 Advanced Lines: Covering finned tubes, seamless boiler tubes, and alloy pipes.
20,000㎡ Facility: Equipped with CNC cold pilger mills and automated annealing furnaces.
Global Certifications: ISO 9001, PED 2014/68/EU, and API 5CT.
Explore our full range at www.steelfintube.com or contact jimmy@steelseamlesspipe.com for technical support.
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ASTM B729 Alloy 20 Seamless Tubes Corrosion-Resistant Cold-Drawn Tubes for Heat Exchangers Boilers Images
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