7122 Aluminum alloy,Aluminum 7122 alloy，E FORU

### **7122 Aluminum Alloy: High-Strength Automotive Alloy** **7122 Aluminum Alloy** is a heat-treatable aluminum-zinc-magnesium alloy specifically designed for automotive applications requiring high strength and excellent formability. This alloy provides an optimal balance of mechanical properties, making it suitable for structural components in the automotive industry where weight reduction and crash performance are critical. --- #### **1. Chemical Composition** | Element | Content (%) (Typical) | Role in the Alloy | | :--- | :--- | :--- | | **Zinc (Zn)** | 4.5 - 5.5 | Primary strengthening element | | **Magnesium (Mg)** | 1.8 - 2.5 | Enhances strength and age-hardening response | | **Copper (Cu)** | 0.40 - 0.8 | Improves strength and stress corrosion resistance | | **Iron (Fe)** | ≤ 0.20 | Impurity element - controlled for consistency | | **Silicon (Si)** | ≤ 0.15 | Impurity element - controlled for ductility | | **Manganese (Mn)** | 0.05 - 0.20 | Grain structure control | | **Chromium (Cr)** | 0.10 - 0.25 | Enhances corrosion resistance | | **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** | 140-160 W/m·K | | **Coefficient of Thermal Expansion** | 23.6 × 10⁻⁶/°C (20-100°C) | | **Modulus of Elasticity** | 70 GPa (10.2 × 10⁶ psi) | --- #### **3. Mechanical Properties (Typical for T6 Temper)** | Property | Typical Value | | :--- | :--- | | **Tensile Ultimate Strength** | 420 - 480 MPa (61 - 70 ksi) | | **Tensile Yield Strength (0.2% Offset)** | 370 - 430 MPa (54 - 62 ksi) | | **Elongation** | 10-15% | | **Compression Yield Strength** | 360 - 420 MPa (52 - 61 ksi) | | **Shear Strength** | 240 - 280 MPa (35 - 41 ksi) | | **Fatigue Strength** | 140 - 170 MPa (20 - 25 ksi) | | **Brinell Hardness** | 115 - 135 HB | --- #### **4. Product Applications** **7122 Aluminum Alloy** is primarily used in automotive structural applications: * **Automotive Structural Components:** * Bumper beams * * Crash management systems * Door intrusion beams * Seat frames * Chassis components * **Transportation Applications:** * Truck frame components * Bus structural members * Railway vehicle structures * **Industrial Applications:** * High-strength fasteners * Machinery components * Structural supports * **Consumer Products:** * Sports equipment * Bicycle components * High-performance tools --- #### **5. International Standards** | Standard Body | Designation | Specification | | :--- | :--- | :--- | | **Aluminum Association** | 7122 | AA Teal Sheets | | **ASTM International** | 7122 | ASTM B209 | | **European Norm** | EN AW-7122 | EN 485-2 | | **Japanese Standards** | A7122 | JIS H 4000 | | **Unified Numbering System** | A97122 | UNS Registry | --- #### **6. Key Characteristics** **Advantages:** * **High strength-to-weight ratio** * **Excellent energy absorption** characteristics * **Good formability** in T4 temper * **Superior crash performance** * **Good weldability** * **Excellent fatigue resistance** * **Cost-effective** for automotive applications **Limitations:** * Requires controlled heat treatment * Limited to sheet and plate forms * Not suitable for high-temperature applications * Requires corrosion protection in severe environments --- #### **7. Manufacturing Considerations** * **Stamping:** Good formability in solution-treated condition * **Welding:** Good weldability using resistance and MIG welding * **Heat Treatment:** Excellent response to artificial aging * **Joining:** Suitable for mechanical fastening and adhesive bonding * **Surface Treatment:** Good for painting and coating --- #### **8. Special Features** **7122 Aluminum Alloy** offers automotive-specific advantages: * **Crash Energy Management:** Excellent energy absorption capabilities * **Weight Reduction:** Significant mass savings over steel components * **Manufacturing Compatibility:** Suitable for high-volume production * **Property Consistency:** Reliable mechanical properties **Automotive Manufacturing Advantages:** - Compatible with existing production lines - Good spot weldability - Excellent paint adhesion - Predictable springback characteristics --- #### **9. Performance Characteristics** * **Crash Performance:** Superior energy absorption * **Fatigue Life:** Excellent for automotive structural applications * **Corrosion Resistance:** Adequate with proper protection * **Durability:** Good long-term performance **7122 Aluminum Alloy** represents a significant advancement in automotive aluminum technology, specifically engineered to meet the demanding requirements of modern vehicle safety and lightweighting initiatives. The alloy's unique combination of high strength, excellent energy absorption, and good manufacturability makes it particularly valuable for automotive safety-critical components where crash performance and weight reduction are paramount. The continued adoption of 7122 demonstrates the automotive industry's commitment to improved vehicle safety and fuel efficiency through advanced materials engineering.

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 2182 gallon liquid totes Special package is available on request.