ASTM B729 Alloy 20 Seamless Tubes
Cold-Drawn Precision Tubes for Demanding Thermal Applications

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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

Mechanical Properties

Chemical Composition (%)

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.

Yuhong Holding Group has more than 35 years experience for pipeline products, till now we have 3 big joint venture factories,  the total production area more than 130000 square meters, and more than 600 workers with 106 production lines give our clients excellent supporting always.   The factories already got certificates like : ABS, LR, DNV-GL, BV, KR, CCS, ASME, ISO 9001, ISO14001, ISO18001, ect.

Our factories main products as below : 
Factory 1th: Stainless steel seamless tube, Duplex steel seamless tube, Super duplex steel seamless tube, Nickel alloy steel seamless tube;

Factory 2th: Carbon steel seamless tube, Alloy steel seamless tube; Enhanced Heat Tranfer Tube, low fin tube ,U bending workshop;
Factory 3th: High frequency welding fin tube(HFW fin tube, Solid Fin tube, Studded Tube, Serrated Fin tube, Longitudinal welding fin tube), Wound fin tube(L type fin tube, LL type fin tube,  KL type fin tube), Embedded G type fin tube , Extruded fin tube,  low fin tube, U bend & 180deg. Return;

Yuhong Holding Group also has gained rich experience for project package( products contain:Pipes, Fittings, Flanges, heat exchanger, furnace, fired heater, air cooler, boiler) , YUHONG brand has marked its global presence in more than 85 countries, like, Korea, USA, Canada, Mexico, Colombia, Bolivia, Chile, Argentina, Brazil, Ecuador, Austria, New Zealand, Singapore, Malasyia, Indonesia, Thailand, Vietnam, Ukraine, Turkey,Sauid Arabia, Qatar, U.A.E,Israel,India, UK, France, Italy, Gernmany, Poland, Spain,... We have successfully implemented the orders of Cross Country Pipelines for our valuable customers. In addition, we have also developed a huge network of contacts and strategic alliances with most important manufacturers as stockists around the world.