7204 Aluminum alloy,Aluminum 7204 alloy，E FORU

### **7204 Aluminum Alloy: High-Strength Automotive Alloy** **7204 Aluminum Alloy** is a heat-treatable aluminum-zinc-magnesium alloy specifically developed for automotive structural applications requiring high strength, excellent energy absorption characteristics, and good formability. This alloy provides an optimal balance between mechanical performance and manufacturing efficiency for safety-critical automotive components. --- #### **1. Chemical Composition** | Element | Content (%) (Typical) | Role in the Alloy | | :--- | :--- | :--- | | **Zinc (Zn)** | 4.8 - 5.8 | Primary strengthening element through formation of MgZn₂ precipitates | | **Magnesium (Mg)** | 2.0 - 2.8 | Enhances strength and age-hardening response | | **Copper (Cu)** | 0.50 - 1.0 | Improves strength and stress corrosion resistance | | **Iron (Fe)** | ≤ 0.15 | Tightly controlled impurity | | **Silicon (Si)** | ≤ 0.12 | Tightly controlled impurity | | **Manganese (Mn)** | 0.10 - 0.25 | Grain structure control | | **Chromium (Cr)** | 0.10 - 0.25 | Enhances corrosion resistance | | **Zirconium (Zr)** | 0.08 - 0.16 | Grain refiner and recrystallization inhibitor | | **Titanium (Ti)** | ≤ 0.10 | Grain refiner | | **Other Elements** | ≤ 0.05 each; ≤ 0.15 total | - | | **Aluminum (Al)** | Balance | Base metal | --- #### **2. Physical Properties** | Property | Value / Description | | :--- | :--- | | **Density** | 2.80 g/cm³ (0.101 lb/in³) | | **Melting Range** | 550°C - 640°C (1022°F - 1184°F) | | **Electrical Conductivity** | 38-42% IACS | | **Thermal Conductivity** | 140-155 W/m·K | | **Coefficient of Thermal Expansion** | 23.6 × 10⁻⁶/°C (20-100°C) | | **Modulus of Elasticity** | 70.5 GPa (10.2 × 10⁶ psi) | --- #### **3. Mechanical Properties (Typical for T6 Temper)** | Property | Typical Value | | :--- | :--- | | **Tensile Ultimate Strength** | 430 - 480 MPa (62 - 70 ksi) | | **Tensile Yield Strength (0.2% Offset)** | 380 - 430 MPa (55 - 62 ksi) | | **Elongation** | 10-14% | | **Compression Yield Strength** | 370 - 420 MPa (54 - 61 ksi) | | **Shear Strength** | 240 - 280 MPa (35 - 41 ksi) | | **Fatigue Strength** | 150 - 180 MPa (22 - 26 ksi) | | **Brinell Hardness** | 120 - 140 HB | --- #### **4. Product Applications** **7204 Aluminum Alloy** is primarily used in automotive structural applications: * **Automotive Safety Components:** * Bumper reinforcement systems * Crash boxes and energy absorbers * Door intrusion beams * Side impact protection systems * Front and rear rail structures * **Body-in-White Applications:** * Pillar reinforcements (A, B, C pillars) * Roof rails and headers * Floor cross members * Body structural reinforcements * **Chassis Applications:** * Chassis frame components * Suspension mounting brackets * Subframe members * **Commercial Vehicles:** * Truck frame components * Bus structural members * Heavy vehicle safety components --- #### **5. International Standards** | Standard Body | Designation | Specification | | :--- | :--- | :--- | | **Aluminum Association** | 7204 | AA Teal Sheets | | **ASTM International** | 7204 | ASTM B209 | | **European Norm** | EN AW-7204 | EN 485-2 | | **Japanese Standards** | A7204 | JIS H 4000 | | **Unified Numbering System** | A97204 | UNS Registry | --- #### **6. Key Characteristics** **Advantages:** * **Excellent energy absorption** capabilities * **High strength-to-weight ratio** * **Superior crash performance** * **Good formability** in T4 condition * **Excellent fatigue resistance** * **Good weldability** * **Cost-effective** for automotive production **Limitations:** * Requires controlled heat treatment * Limited to sheet product forms * Requires corrosion protection * Higher cost than standard automotive alloys --- #### **7. Manufacturing Considerations** * **Stamping:** Good formability in solution-treated condition * **Welding:** Excellent spot weldability and MIG welding compatibility * **Heat Treatment:** Strong response to paint bake hardening * **Joining:** Suitable for adhesive bonding and mechanical fastening * **Surface Treatment:** Good paint adhesion and coating compatibility --- #### **8. Special Features** **7204 Aluminum Alloy** offers specific advantages for automotive applications: * **Crash Energy Management:** Superior energy absorption in impact scenarios * **Weight Reduction:** Significant mass savings over steel components * **Manufacturing Compatibility:** Suitable for high-volume production processes * **Property Consistency:** Reliable mechanical properties **Automotive Performance Benefits:** - Enhanced vehicle safety ratings - Improved fuel efficiency through weight reduction - Reduced greenhouse gas emissions - Maintains structural integrity in crash scenarios --- #### **9. Performance Characteristics** * **Crash Performance:** Excellent energy absorption per unit mass * **Fatigue Life:** Superior durability under cyclic loading * **Corrosion Resistance:** Adequate with proper surface protection * **Impact Toughness:** Good resistance to dynamic loading **7204 Aluminum Alloy** represents advanced automotive aluminum technology, specifically engineered to address the dual challenges of vehicle lightweighting and enhanced safety performance. The alloy's optimized composition delivers an exceptional combination of high strength and energy absorption characteristics, making it particularly valuable for automotive safety-critical components where crashworthiness and weight reduction are paramount. The alloy's compatibility with standard automotive manufacturing processes and its consistent performance have established it as a key material in the automotive industry's pursuit of safer, more efficient, and environmentally friendly vehicles.

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 2202 gallon liquid totes Special package is available on request.