High-Performance Bimetallic Extruded Fin Tube (ASTM A179 Base + AL Fin)

1. Product Overview: ASTM A179 & Aluminum Bimetallic Extruded Fin Tube

The bimetallic extruded fin tube is a critical component in modern thermal management systems. By combining an ASTM A179 seamless cold-drawn low-carbon steel base tube with a highly conductive Aluminum (AL) fin sleeve, this product offers an unparalleled balance of mechanical strength and thermodynamic efficiency. Designed specifically for harsh industrial environments, our ASTM A179 + AL extruded fin tubes provide excellent corrosion protection and ensure zero contact thermal resistance between the core tube and the finned surface.

2. Structural Design & Extrusion Process of ASTM A179 Base and AL Fins

The exceptional performance of this fin tube lies in its structural integrity and the cold-extrusion manufacturing process.

• Base Tube (ASTM A179): Acts as the high-pressure core, ensuring superior mechanical strength and resistance to internal fluid pressure.

• Fin Material (Aluminum 1060/1100): Selected for its lightweight nature, excellent thermal conductivity, and atmospheric corrosion resistance.

• Embedding/Extrusion Process: Unlike welded or wrapped tubes, our bimetallic extruded fin tubes are manufactured by inserting the ASTM A179 steel tube into an Aluminum muff tube. The aluminum is then cold-extruded (rolled) under high pressure to form the fins. This process creates a tight, gap-free, metallurgical-like bond between the ASTM A179 base and the AL fin, completely protecting the steel core from atmospheric corrosion.

3. Chemical Composition: ASTM A179 Carbon Steel & AL Fins

To ensure stable performance in heat exchange applications, we strictly adhere to international material standards. Below is the chemical composition of the ASTM A179 base tube and the standard Aluminum (AL 1060) fin material.

Table 1: Chemical Composition of ASTM A179 Base Tube (%)

Table 2: Chemical Composition of AL 1060 Fin Material (%)

4. Dimension & Tolerance Range for ASTM A179 + AL Extruded Fin Tubes

Precision is crucial for the assembly of heat exchanger tube bundles. We manufacture our ASTM A179 and Aluminum fin tubes to strict tolerances, meeting or exceeding API 661 standards.

Table 3: Standard Dimensions and Tolerances

5. Performance Advantages of ASTM A179 / AL Extruded Finned Tubes

Why do global engineers prefer the combination of ASTM A179 steel and Aluminum extruded fins?

• Maximum Heat Transfer Efficiency: The cold-extrusion process ensures no air gap between the ASTM A179 core and the AL fin, eliminating thermal contact resistance.

• Superior Corrosion Protection: The seamless aluminum outer layer completely encapsulates the ASTM A179 base tube, preventing the carbon steel from rusting in wet or corrosive atmospheric conditions.

• High Temperature Resistance: This bimetallic extrusion can operate stably at temperatures up to 300°C (572°F) without the aluminum fins loosening or deforming.

• Mechanical Rigidity: The extruded AL fins are strong enough to withstand high-pressure water washing during routine maintenance without bending.

6. Detailed Applications of ASTM A179 Base & AL Fin Tubes

Due to their robust design and thermal efficiency, our ASTM A179 and Aluminum bimetallic fin tubes are widely utilized across various heavy industries:

• Petrochemical & Oil Refineries: Essential components in Air Cooled Heat Exchangers (ACHE) and gas cooling systems.

• Power Generation: Used in air condensers, steam exhaust cooling, and boiler economizers.

• HVAC & Refrigeration: Large-scale commercial air conditioning units and industrial chiller systems.

• Food & Agriculture: Timber drying kilns, grain processing, and large-scale greenhouse heating systems.

7. Our Expertise: Why Choose Us for Your ASTM A179 + AL Fin Tube Orders?

As a seasoned manufacturer and exporter of heat exchanger components, we bring decades of B2B experience to your procurement process.

• Certified Quality: All ASTM A179 base tubes undergo rigorous NDT (Non-Destructive Testing), Eddy Current testing, and hydrostatic testing before the AL fin extrusion process.

• Global Export Experience: We provide comprehensive EN 10204 3.1 Mill Test Certificates (MTC) and export seaworthy packaging (fumigated wooden boxes or steel frames) to ensure your ASTM A179 / AL fin tubes arrive safely at your port.

• Custom Fabrication: Whether you need specific fin pitches, staggered tube arrangements, or custom bare end lengths, our engineering team can manufacture exactly to your mechanical drawings.