High-Efficiency Extruded Finned Tubes | A179 Carbon Steel Base with Aluminum Fins

1. Product Overview: Extruded Bimetal Finned Tubes

Material: Base Tube - ASME SA-179 Carbon Steel | Fins - Aluminum 1100/3003

Extruded finned tubes combine the superior pressure resistance of carbon steel with the exceptional thermal conductivity of aluminum fins. Through a cold extrusion process, fins are metallurgically bonded to the base tube, creating a seamless heat transfer surface ideal for high-corrosion and high-temperature applications.

2. Material Composition & Specifications

▶ Base Tube Material: ASME SA-179 Carbon Steel

▶ Fin Material: Aluminum 1100/3003

3. Structural Design & Manufacturing Process

Base Tube: Seamless cold-drawn carbon steel (OD: 15.88 - 50.8 mm)

Fins: Helical aluminum fins (Height: 6-16 mm, Thickness: 0.8-1.2 mm)

Bonding: Cold Extrusion Process

• • Aluminum sleeve forced over base tube under 200-300 tons pressure

• • Fins extruded from sleeve with >35 MPa interfacial strength

• • Zero contact resistance (metallurgical bond)

4. Dimensional Tolerances (Per ASTM Standards)

5. Performance Advantages

• Heat Transfer Efficiency: 8-12x higher than bare tubes (fin surface ratio)

• Corrosion Resistance: Aluminum fins protect carbon steel core

• Fouling Resistance: Optimized fin spacing (3-5 FPI) for dusty gases

• Pressure Integrity: Base tube withstands 6.5 MPa working pressure

• Thermal Expansion Compatibility: Δα < 0.5×10⁻⁶/°C

6. Application Industries & Equipment

7. Why Choose Our Finned Tubes?

• 15+ Years Expertise: ISO 9001-certified extrusion facilities

• Customization: Fin density (2-8 FPI), tube lengths (1-12m), coatings (anodized/Al-zinc)

• Quality Assurance:

100% pressure testing (hydrostatic/pneumatic)

Eddy current inspection of base tubes

Bond strength shear testing (per ASTM D1002)

Global Supply: MOQ 500 meters, lead time 4-6 weeks