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