4343 Aluminum alloy,Aluminum 4343 alloy,E FORU

### **Product Introduction: Aluminum 4343 Alloy** **Overview** Aluminum 4343 Alloy is a specialized aluminum-silicon brazing filler metal primarily used as cladding material in brazing sheets. With its specific silicon content and optimized composition, it offers excellent brazing characteristics, good fluidity, and reliable performance in various brazing operations, particularly in controlled atmosphere brazing (CAB) processes. --- ### **1. Chemical Composition (Typical Weight %)** | Element | Content (%) | |---------|-------------| | **Aluminum (Al)** | Balance | | **Silicon (Si)** | 6.8 - 8.2 | | **Iron (Fe)** | ≤ 0.8 | | **Copper (Cu)** | ≤ 0.25 | | **Manganese (Mn)** | ≤ 0.10 | | **Magnesium (Mg)** | ≤ 0.10 | | **Zinc (Zn)** | ≤ 0.20 | | **Titanium (Ti)** | ≤ 0.15 | | **Other Elements** | ≤ 0.05 each | | **Total Others** | ≤ 0.15 | --- ### **2. Physical Properties** | Property | Value / Description | |----------|---------------------| | **Density** | 2.68 g/cm³ | | **Melting Range** | 577 - 615 °C | | **Solidus Temperature** | 577 °C | | **Liquidus Temperature** | 615 °C | | **Electrical Conductivity** | 37-42% IACS | | **Thermal Conductivity** | 152-172 W/m·K | | **Coefficient of Thermal Expansion** | 21.8 × 10⁻⁶/°C | | **Modulus of Elasticity** | 73 GPa | --- ### **3. Mechanical Properties (As-clad Condition)** | Property | Value Range | |----------|-------------| | **Tensile Strength** | 125-165 MPa | | **Yield Strength (0.2% Offset)** | 55-95 MPa | | **Elongation (in 50mm)** | 12-20% | | **Hardness (Brinell)** | 42-57 HB | | **Shear Strength** | 115-145 MPa | --- ### **4. International Standards** | Standard Body | Designation | |---------------|-------------| | **Aluminum Association (AA)** | AA 4343 | | **European Standard (EN)** | EN AW-4343 | | **ISO** | AlSi7 (ISO 18273) | | **UNS** | A94343 | | **ASTM** | B209, B373 | --- ### **5. Product Applications** **Brazing Sheet Applications:** - Heat exchanger fins and tubes - Automotive radiators - Air conditioner evaporators and condensers - Charge air coolers - Oil coolers and intercoolers **Controlled Atmosphere Brazing:** - Automotive heat exchangers - HVAC system components - Refrigeration equipment - Industrial cooling systems - Aerospace heat exchangers **Cladding Applications:** - Multi-layer brazing sheets - Composite material manufacturing - Heat transfer surface coatings - Joining applications in aluminum assemblies --- ### **6. Key Characteristics & Advantages** - **Excellent Brazing Performance**: Optimized melting characteristics for brazing operations - **Good Fluidity**: Superior flow characteristics during brazing - **Controlled Melting Range**: Appropriate solidus and liquidus temperatures for reliable brazing - **Corrosion Resistance**: Good resistance to various cooling media and environments - **Compatibility**: Excellent compatibility with core alloys in brazing sheets - **Surface Quality**: Good for subsequent finishing and coating operations - **Process Versatility**: Suitable for both flux and fluxless brazing processes --- ### **7. Special Features** **Brazing Characteristics:** - Balanced melting range for process control - Good capillary action - Effective fillet formation - Minimal base metal erosion - Compatible with commercial brazing fluxes **Manufacturing Advantages:** - Can be rolled to thin gauges - Good bonding characteristics with core alloys - Consistent performance in high-volume production - Predictable behavior during brazing processes - Excellent for automated manufacturing lines --- ### **8. Processing Guidelines** **Brazing Parameters:** - Optimal brazing temperature: 590-610°C - Suitable for controlled atmosphere brazing - Compatible with vacuum brazing processes - Works well with standard brazing fluxes **Cladding Process:** - Typically clad onto core alloys like 3003, 6951 - Cladding ratio usually 5-15% - Proper surface preparation essential - Controlled rolling parameters required **Quality Control:** - Visual inspection for complete flow and fillets - Leak testing for pressure-containing assemblies - Metallographic examination for joint integrity - Corrosion testing for long-term performance **Disclaimer:** The information provided is for reference purposes only. Brazing performance may vary depending on specific process parameters, core materials, and equipment conditions. For critical applications, consult technical data sheets from material suppliers and conduct appropriate brazing procedure qualifications. The alloy is specifically designed for brazing sheet applications and should be evaluated for compatibility with specific core materials and brazing processes.

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 1766 gallon liquid totes Special package is available on request.