High-Frequency Welded ASME SA335 P9 Helical Finned Tubes | Extreme Heat-Resistant Alloy Steel for Industrial Furnace Systems

Product Overview

Introducing ​ASME SA335 P9 High-Frequency Welded Helical Finned Tubes, designed for extreme-temperature industrial furnace applications. These tubes combine ​chromium-molybdenum alloy durability with ​high-efficiency heat transfer, making them ideal for harsh environments.

​Key Features

​1. Material & Chemical Composition

• ​Base Tube: ASME SA335 P9 Chromium-Molybdenum Alloy Steel (Cr: 8.5-9.5%, Mo: 0.90-1.10%)
• ​Fin Material: High-grade stainless steel (AISI 304/316L) for corrosion resistance.
• ​Chemical Composition:

Compliant with ASME SA335 and ASTM A213 standards.

​2. Mechanical Properties

​3. Manufacturing Process

• ​High-Frequency Welding (HFW): Achieves ​95% weld integrity between fins and base tube through automated spiral winding.
• ​Post-Weld Treatment: Shot blasting + anti-corrosion coating (zinc or epoxy) for enhanced durability.
• ​Quality Control: 100% hydrostatic testing (1.5x design pressure) and ultrasonic inspection.

​4. Applications

• ​High-Temperature Furnaces: Cement kilns, steel reheating systems.
• ​Heat Recovery Units: Boilers, economizers, and air preheaters.
• ​Oil & Gas: Crackers, reformers, and sulfur recovery units.

​Advantages

1. ​Superior Heat Transfer: 4-7x higher efficiency than smooth tubes due to spiral fin design.
2. ​Corrosion Resistance: Withstands acidic/sulfur-rich environments (pH 2-12).
3. ​Long Service Life: 2-3x lifespan over conventional welded tubes.

​FAQ

Q1: What is the lead time for bulk orders?
A: Standard lead time is ​4-6 weeks for 20-ft container loads.

Q2: Can these tubes withstand thermal cycling?
A: Yes, the ASME SA335 P9 alloy ensures stability under repeated heating/cooling.

Q3: Are certifications available?
A: We provide ​ASME, ISO 9001, and EN 10204-3.1 certifications.

​Why Choose Yuhong?

• ​55 Production Lines: Fully automated HFW machines ensure consistent quality.
• ​Global Reach: Exported to 80+ countries with on-time delivery.
• ​Technical Support: 110+ engineers provide custom solutions for fin height (8-20mm) and pitch (4.5-15mm).

Contact Us:

• ​Email: jimmy@steelseamlesspipe.com
• ​WhatsApp: +86 18892647377
• ​Website: www.steelfintube.com

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.