ASTM A312 TP304H Helical Serrated Fin Tube with 11-13Cr Fins For Air Preheaters

Our ASTM A312 TP304H Helical Serrated Fin Tube with 11-13Cr Fins is a precision-engineered heat transfer component, strictly manufactured in line with the ASTM A312 standard—an authoritative specification for seamless, welded, and heavily cold-worked austenitic stainless steel pipes. The product consists of two core parts: the TP304H base tube and 11-13Cr helical serrated fins, which are integrally combined to ensure optimal performance.

1. The Base Tube: ASTM A312 TP304H seamless pipe

(1)Chemical Composition (% by weight)

ASTM A312 TP304H (UNS S30409) is a high-carbon version of the standard TP304 grade. The higher carbon range (0.04–0.10%) is specifically designed to improve creep strength at elevated temperatures.

(2)Mechanical Properties

The mechanical properties of TP304H are similar to standard TP304 but with enhanced performance in high-temperature service due to its higher carbon content.

2. High-Performance 11-13Cr Fins

What truly sets this product apart is the fin material: 11–13% chromium (Cr) steel. These helical serrated fins are carefully selected to provide:

• Enhanced corrosion and oxidation resistance in flue gas environments
• Good thermal conductivity to support efficient heat transfer
• Compatibility with TP304H under cyclic thermal loading
• Cost-effectiveness compared to full stainless steel fins, without compromising service life in moderately aggressive conditions

3. Helical Serrated Fin Design

The helical serrated (cut or segmented) fin geometry is produced by precision winding and mechanical interlocking onto the base tube. This design delivers several critical advantages:

• Improved heat transfer coefficient on the gas side, thanks to interrupted fin surfaces that reduce boundary layer buildup
• Lower fouling tendency compared to solid fin configurations
• Lighter weight per unit length while maintaining substantial extended surface area
• Better soot blowing effectiveness in dirty gas streams

4. Why Choose This Product?

• Thermal Performance: The serrated fin profile increases heat transfer efficiency by up to 20–30% compared to plain solid fins under the same pressure drop.
• Mechanical Integrity: Helical winding ensures consistent contact with the tube outer diameter, minimizing interface resistance.
• High-Temperature Strength: TP304H resists sensitization and intergranular corrosion, even after prolonged exposure in the 550–750°C range.
• Customizable: Tube length, fin density, fin height, and end preparations are available to match your specific process requirements.

5.Typical Applications

Application Scenarios This versatile helical serrated fin tube is widely applied in various industrial fields that require efficient heat transfer and high durability, especially in high-temperature, high-pressure, and corrosive environments. Key applications include:

- Petroleum industry: Process heaters, heat exchangers for oil refining and chemical processing.

- Power generation industry: Boilers, air preheaters, economizers, and gas turbine exhaust heat exchangers.

- Metallurgical industry: Heat exchange systems in smelting and processing processes.

- Chemical industry: Heat exchangers for corrosive media and high-temperature reaction systems. It performs exceptionally well in environments with high fin-side temperatures, corrosive gases, or CO₂-rich media, delivering long-term reliability and reducing operational costs for customers.