4343/3003/4343 Aluminum Brazing Sheet Coil Strip

2026-05-20

As a manufacturer specializing in aluminum brazing sheet, Haomei Aluminum's 4343/3003/4343 aluminum brazing sheet coil strip is a mainstream brazing substrate in the heat exchange industry. Leveraging its precise three-layer composite structure, stable brazing performance, and excellent environmental adaptability, 4343/3003/4343 aluminum brazing sheet coil is widely suitable for high-end markets worldwide, including automotive, home appliance, and industrial heat exchange, and is a core brazing aluminum material for overseas customers' bulk purchases.

Structurally, 4343/3003/4343 aluminum brazing sheet coil strip features a sandwich composite structure with double-sided 4343 brazing layers + a middle 3003 manganese alloy core layer, tailor-made for brazing operations.
The outer 4343 aluminum alloy has a strictly controlled silicon content of 7.0%–10.0%, with a stable liquidus temperature of around 595℃. Its melting point is significantly lower than the 3003 core substrate, allowing for complete melting and flow during brazing without burning the base material.
The middle 3003 core layer, enhanced with manganese, possesses high strength, deformation resistance, and resistance to refrigerant corrosion, providing structural support. We can customize the brazing layer thickness from 5% to 15% as needed.
Specifications cover thicknesses from 0.1–3.0 mm and widths from 100–1250 mm, available in both coil and sheet forms, and tempers including O, H14, and H18. Strict adherence to ASTM and EN international standards is maintained, and slitting, special packaging, and customized production are supported.

The multi-layered composite design gives 4343/3003/4343 aluminum brazing sheet coil strip an irreplaceable core advantage.
Firstly, the three layers are formed using a hot-rolled metallurgical composite process, resulting in a tight bond between the layers without delamination or bubbles. This provides excellent resistance to impact and bending, making it suitable for automated stamping and deep-drawing processes.
Secondly, the 4343 brazing filler metal has high fluidity, resulting in a dense and uniform weld with satisfactory airtightness. It can withstand high-pressure refrigerant environments with extremely low leakage rates.
Thirdly, the 3003 core layer is resistant to water vapor, salt spray, and refrigerant corrosion, making it suitable for long-term high-temperature and high-pressure operating conditions and extending its service life.
Fourthly, the strip surface undergoes passivation and cleaning treatment, removing oxide layers and oil contaminants, significantly improving brazing wettability and increasing welding efficiency.
Fifthly, it features stringent dimensional accuracy, with thickness tolerance controlled within ±0.005mm, ensuring strong batch-to-batch performance consistency and suitability for large-scale production lines overseas.

In terms of application, 4343/3003/4343 aluminum brazing sheet coil strip has extremely high adaptability, deeply covering high-end heat exchange scenarios worldwide, and is an indispensable core substrate for many industries.
In the automotive sector, our products are widely used in radiators, condensers, and intercoolers of traditional gasoline vehicles, as well as battery cooling plates and thermal management systems for new energy vehicles. They meet the heat exchange needs of various vehicle models, helping to improve vehicle energy efficiency.
In the home appliance HVAC sector, they are suitable for air conditioner evaporators, condensers, and air source heat pump heat exchangers. Their high-efficiency heat exchange and corrosion resistance enhance the user experience and lifespan of home appliances.
In the industrial sector, they can be used in engineering machinery coolers, generator set heat dissipation components, rail transit heat exchange devices, and solar collectors. They are also suitable for special applications such as seawater desalination equipment and lightweight heat exchange components for aerospace, comprehensively meeting the personalized needs of customers in various overseas industries.

In the production process of 4343/3003/4343 aluminum brazing sheet coil strip, we use high-purity aluminum ingots with precise proportions, undergoing a full-process processing including vacuum casting, hot rolling composite, multi-pass cold rolling, atmosphere-protected annealing, and online surface treatment. Combined with multiple quality inspection processes, we control every step from composition and mechanical properties to brazing effect, ensuring the stability of exported products. Haomei can provide material testing reports and competitive pricing, comprehensively assisting overseas customers in establishing production facilities. We are a reliable brazing aluminum supplier in the global heat exchange industry.

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