Overview

Low-finned tubes with extruded fins are manufactured by passing a seamless base tube through special dies. The tube material is cold-formed radially outward to create integral, helical fins that are part of the tube wall itself. This results in a single-piece, monolithic construction where the fins and tube are metallurgically bonded.

Extruded fin tubes offer superior heat transfer characteristics. The integral fin structure eliminates contact resistance between the fin and tube, ensuring maximum thermal efficiency. The fins typically have a trapezoidal profile and consistent spacing, optimized for efficient heat flow in applications involving liquids or condensing vapors.

Key features include:

• Exceptional Thermal Bond: Integral fin-to-tube structure eliminates contact resistance, maximizing heat transfer efficiency.

• High Strength & Integrity: Monolithic construction provides excellent mechanical strength, pressure containment, and resistance to thermal cycling stresses.

• Superior Corrosion Resistance: Base tube and fins are the same corrosion-resistant stainless steel, ideal for harsh chemical or marine environments.

• High Temperature Capability: Suitable for continuous service temperatures up to 300°C (depending on specific grade) without degradation.

• Robust & Cleanable: Smooth fin profile and solid construction resist fouling and allow for effective cleaning.

• Long Service Life: Excellent corrosion resistance and structural integrity contribute to extended operational lifespan, offering good long-term value.

Base tube & Fin material (Integral):

• Stainless Steel:

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  • ASME SA213/ASTM A213 TP304/304L, TP316/316L, TP321, TP310S, TP317

  • ASME SA249/ASTM A249 TP304/304L, TP316/316L

  • Duplex Stainless Steels (e.g., UNS S31803, S32205)

  • Super Austenitic Stainless Steels (e.g., 904L, AL-6XN)

  • Nickel Alloys (e.g., Inconel 625, Incoloy 825 - less common for extrusion

  • but possible)

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