4343/3003/4343 Aluminum Brazing Sheet Coil Strip For Radiator Fin

2025-07-04

4343/3003/4343 aluminum brazing sheet coil strip is a three-layer composite aluminum alloy material designed for radiator fins, with a sandwich structure - the middle layer is 3003mod aluminum-manganese alloy, and the two sides are covered with 4343 aluminum-silicon alloy. This structure combines the advantages of two alloys: 3003mod provides excellent corrosion resistance, processability and structural strength, while 4343 achieves low melting point (577-600℃) and good brazing fluidity with high silicon content (6.8-8.2%), which is suitable for the welding needs of complex heat dissipation structures.

The composition of 4343/3003/4343 aluminum brazing sheet coil strip:

- Core layer (3003 aluminum alloy): Al-Mn alloy (Mn content is about 1.0~1.5%), providing excellent processability, corrosion resistance and medium-strength support136.

- Brazing layer (4343 aluminum alloy): Al-Si alloy (Si content 6.8~8.2%), melting point about 577°C, melts and fills the weld during brazing, achieving seamless connection and improving corrosion resistance.

- Symmetrical composite design: double-sided cladding 4343 (single layer thickness accounts for 8~12%), ensuring uniform flow of molten brazing material during welding, suitable for double-sided brazing of heat sinks and pipes.

- Brazing: The brazing material is melted and filled between the joints by heating to form a strong connection, which is suitable for efficient manufacturing of radiators.

Processing flexibility of 4343/3003/4343 aluminum brazing sheet:

Thickness range 0.03-500mm, width 100-2500mm, supports customization of multiple states such as O state (soft state) and H14 (work hardening state).

It can be processed into complex shapes such as harmonica tube type and parallel tube type liquid cold plate through stamping, extrusion, vacuum brazing and other processes.

Brazing process of 4343/3003/4343 aluminum brazing strip:

- Vacuum brazing: suitable for high-precision components, such as electric vehicle power module radiators, to avoid oxidation and improve weld strength.

- Controlled atmosphere brazing: nitrogen protection, low cost, suitable for large-scale production such as power battery water cooling plates.

Properties of 4343/3003/4343 aluminum brazing sheet coil strip:

- Thermal conductivity: The thermal conductivity of aluminum silicon alloy is about 101-126W/(m・℃), which is close to the level of pure aluminum and can efficiently transfer heat.

- Corrosion resistance: 3003mod aluminum manganese alloy has better corrosion resistance than pure aluminum and is suitable for long-term use in humid or acidic and alkaline environments.

- Brazing compatibility: The 4343 coating can be quickly melted in vacuum or controlled atmosphere brazing (560-620℃) to form a dense weld and avoid oxide film interference.

Typical application scenarios of 4343/3003/4343 aluminum brazing sheet coil strip:

- New energy vehicle thermal management: power battery water cooling plate, motor controller liquid cooling plate.

- Industrial heat dissipation equipment: power station air cooler, 5G base station heat exchanger.

- Consumer electronics: high-power chip radiator fins.

This 4343/3003/4343 aluminum brazing sheet coil strip can be used to connect the heat sink with other components through the brazing process during the manufacturing process of the radiator, ensuring the overall performance and durability of the radiator. If you need further specific quotations or customized solutions, you can directly contact us.

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