Structural Types and Material Selection for Laser-Welded Finned Tubes

Structural Types and Material Selection for Laser-Welded Finned Tubes

Based on fin arrangement, laser-welded finned tubes are primarily categorized into two types, suited for different heat exchange scenarios:

Helical Finned Tubes: Fins are helically wound around the base tube with adjustable spacing (typically 2-10mm). They offer large heat transfer area and strong airflow turbulence, making them ideal for air-side heat exchange (e.g., heat exchangers, boiler economizers).

Longitudinal Fin Tubes: Fins are distributed axially along the base tube in radial or parallel arrangements. These tubes feature low flow resistance and ease of cleaning, making them suitable for heat exchange involving dusty or particulate-laden fluids (e.g., power plant air-cooled islands, industrial waste heat recovery equipment).

Material selection must align with operating conditions regarding temperature, corrosion resistance, and thermal conductivity requirements. Common combinations include:

Application: Industrial high-temperature flue gas heat exchange (≤600°C)

Base tube material: 20# seamless steel tube

Fin material: Q235 steel

Core reason: Low cost, high-temperature resistance, meets general industrial requirements

Application scenario: Corrosion-resistant environments (e.g., chemical plants, marine)

Base tube material: 304/316 stainless steel

Fin material: 304/316 stainless steel

Core Reason: Resists acid, alkali, and salt spray corrosion; lifespan exceeds 15 years

Application Scenarios: High-efficiency heat transfer scenarios (e.g., air conditioning heat exchangers)

Base Tube Material: Copper tubing

Fin Material: Copper

Core Reason: High thermal conductivity (copper thermal conductivity: 398 W/(m·K)), superior heat transfer efficiency