Steel aluminum extruded finned tubes, also known as bimetallic extruded finned tubes, aluminum extruded finned tubes, or rolled finned tubes, are advanced heat transfer components widely used in industrial air cooling, heating systems, and waste heat recovery applications.
The tube adopts a steel-aluminum composite structure, where the inner steel tube provides excellent pressure resistance while the outer aluminum fins deliver outstanding heat dissipation performance.
Through an integrated extrusion process, the aluminum layer is tightly bonded with the steel tube, creating a high-performance heat exchanger tube that offers significantly better thermal performance and durability compared with traditional high-frequency welded finned tubes and wrapped finned tubes.
A steel aluminum extruded finned tube consists of two main components:
The inner tube serves as the pressure-bearing channel for the heat transfer medium.
Common materials include:
20# seamless carbon steel tube
Suitable for:
304 stainless steel tube
Suitable for:
Typical specifications:
The steel tube provides reliable structural support and ensures safe operation under pressure conditions.
The outer fin layer is made of high-quality aluminum materials:
Features:
The aluminum sleeve completely covers the steel tube and is formed into spiral fins through cold extrusion rolling.
Typical fin specifications:
The production process includes:
Unlike welded finned tubes, the extrusion process creates:
The combination of aluminum fins and steel tube provides outstanding thermal performance.
Advantages include:
Due to the stable composite structure, the tube maintains excellent heat transfer performance during long-term operation.
After 5 years of continuous use, the heat transfer capacity can remain above 95% of the original performance under proper operating conditions.
The fins and base tube become a single metal structure through extrusion.
Compared with:
Extruded finned tubes offer:
They are especially suitable for industrial environments with frequent temperature changes.
The aluminum layer completely covers the steel tube surface.
Benefits:
This makes them ideal for industrial air heating and cooling applications.
The extruded fins feature:
Compared with welded finned tubes:
Because aluminum has a much lower density than steel:
This advantage is especially valuable for large industrial heat exchanger systems.
Although steel aluminum extruded finned tubes provide excellent performance, several application limitations should be considered.
Aluminum fins have limited resistance to:
Applications near coastal areas or highly corrosive chemical environments require careful evaluation.
The recommended continuous operating temperature is:
≤280–300℃
Excessive temperatures may cause:
Compared with standard high-frequency welded finned tubes, extruded finned tubes have:
However, their improved efficiency and longer service life often provide better lifecycle value.
Steel aluminum extruded finned tubes are suitable for:
Suitable external environments include:
Steel aluminum extruded finned tubes are widely used in:
They are an ideal choice for applications requiring high heat transfer efficiency, lightweight design, and long-term operational stability.
Steel aluminum extruded finned tubes combine the pressure resistance of steel with the superior thermal conductivity of aluminum. Through advanced extrusion technology, the steel tube and aluminum fins form a highly reliable bimetallic heat transfer element.
With advantages including high heat transfer efficiency, strong mechanical bonding, corrosion protection, low airflow resistance, and lightweight construction, these finned tubes have become a preferred solution for modern industrial heating, cooling, and heat recovery systems.
