7020-T652 Aluminum alloy,Aluminum 7020-T652 alloy，E FORU

### **Aluminum 7020-T652 Alloy (EN AW-7020) - Product Introduction** **Aluminum 7020-T652** is a high-strength aluminum-zinc-magnesium alloy that has been solution heat-treated, stress-relieved by stretching, and artificially aged. This specific temper provides enhanced dimensional stability and reduced residual stresses compared to the standard T6 temper, making it ideal for precision applications requiring stable mechanical properties and minimal distortion during machining. --- #### **1. Chemical Composition** The chemical composition maintains the same balanced formulation as standard 7020 alloy: | Element | Content (%) (Typical) | Standard Range (EN 573-3) | |---|---|---| | **Aluminum (Al)** | Balance | Balance | | **Zinc (Zn)** | 4.0 - 5.0 | 4.0 - 5.0 | | **Magnesium (Mg)** | 1.0 - 1.5 | 1.0 - 1.5 | | **Manganese (Mn)** | 0.05 - 0.50 | 0.05 - 0.50 | | **Chromium (Cr)** | 0.10 - 0.35 | 0.10 - 0.35 | | **Zirconium (Zr)** | 0.08 - 0.20 | 0.08 - 0.20 | | **Copper (Cu)** | ≤ 0.20 | ≤ 0.20 | | **Iron (Fe)** | ≤ 0.40 | ≤ 0.40 | | **Silicon (Si)** | ≤ 0.35 | ≤ 0.35 | | **Titanium (Ti)** | ≤ 0.15 | ≤ 0.15 | | **Others (Each)** | ≤ 0.05 | ≤ 0.05 | | **Others (Total)** | ≤ 0.15 | ≤ 0.15 | --- #### **2. Physical Properties** Aluminum 7020-T652 exhibits stable physical properties: | Property | Metric Value | Imperial Value | |---|---|---| | **Density** | 2.78 g/cm³ | 0.100 lb/in³ | | **Melting Range** | 475 - 635 °C | 887 - 1175 °F | | **Electrical Conductivity** | 37-41 % IACS | 37-41 % IACS | | **Thermal Conductivity** | 148-163 W/m·K | 1025-1130 BTU·in/(hr·ft²·°F) | | **Coefficient of Thermal Expansion** | 23.7 × 10⁻⁶/K | 13.2 × 10⁻⁶/°F | | **Modulus of Elasticity** | 70 GPa | 10,150 ksi | | **Shear Modulus** | 26.5 GPa | 3,840 ksi | --- #### **3. Mechanical Properties** **7020-T652 Mechanical Properties:** | Property | Metric Value | Imperial Value | |---|---|---| | **Tensile Strength, Ultimate** | 340-390 MPa | 49,300-56,600 psi | | **Tensile Strength, Yield (0.2%)** | 270-320 MPa | 39,200-46,400 psi | | **Elongation in 50mm** | 11-15% | 11-15% | | **Hardness (Brinell)** | 92-102 HB | 92-102 HB | | **Shear Strength** | 200 MPa | 29,000 psi | | **Fatigue Strength** | 120 MPa | 17,400 psi | | **Fracture Toughness** | 36-41 MPa·√m | 33-37 ksi·√in | --- #### **4. International Standards** Aluminum 7020-T652 conforms to these international standards: * **European Standard (EN):** **EN AW-7020** (Material Number 3.4335) * **ISO:** **AlZn4.5Mg1** under ISO 209 * **EN 755:** Aluminum and aluminum alloy extruded rod/bar, tube and profiles * **ASTM:** **ASTM B221** for Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles, and Tubes * **AMS:** **AMS 4154** (Aerospace Material Specification) * **JIS:** **JIS H 4040** (A7020) * **GB/T:** **GB/T 3190** (Chinese National Standard) --- #### **5. Product Applications** Aluminum 7020-T652 is specified for precision applications requiring dimensional stability: * **Aerospace Components:** Aircraft structural members, precision fittings * **Military Equipment:** Weapon system components, military vehicle parts * **Transportation:** Railway vehicle structural components, truck frames * **Marine Applications:** Precision boat components, marine hardware * **Industrial Machinery:** Precision machine parts, jigs and fixtures * **Automotive:** High-precision vehicle components, suspension parts * **Defense Systems:** Military equipment requiring dimensional stability * **Structural Components:** Critical applications requiring minimal distortion --- #### **6. Key Advantages & Characteristics** * **Enhanced Dimensional Stability:** Stress-relieved condition minimizes distortion during machining * **Reduced Residual Stresses:** Improved performance in precision applications * **Excellent Weldability:** Maintains good welding characteristics of 7020 alloy * **Good Corrosion Resistance:** Suitable for marine and industrial environments * **Superior Machinability:** Stable during precision machining operations * **Consistent Mechanical Properties:** Uniform properties throughout the material * **Good Fatigue Performance:** Excellent resistance to cyclic loading * **Predictable Performance:** Reliable behavior in critical applications **Heat Treatment Process:** - Solution Treatment: 465-480°C (870-900°F) - Rapid quenching - Stress Relieving: 1.5-3% permanent set by stretching - Artificial Aging: 120-140°C (250-285°F) for 16-24 hours **T652 vs T6 Advantages:** - **Improved dimensional stability for machining** - **Reduced risk of distortion after machining** - **Better flatness and straightness** - **Superior performance in precision applications** **Machining Characteristics:** - Minimal distortion during and after machining - Consistent dimensional accuracy - Good surface finish achievable - Suitable for high-precision components --- **Quality Assurance:** - Strict dimensional tolerance requirements - Mechanical property verification - Residual stress testing - Comprehensive quality certification **Processing Recommendations:** - Maintain stable machining conditions - Use sharp cutting tools - Implement proper clamping techniques - Monitor dimensional changes during processing - Follow recommended machining sequences --- **Conclusion:** Aluminum 7020-T652 offers the superior dimensional stability and reduced residual stresses required for precision applications while maintaining the excellent strength, weldability, and corrosion resistance characteristics of the 7020 alloy system. Its stress-relieved condition makes it particularly valuable for applications where dimensional stability during and after machining is critical. The alloy's combination of mechanical properties, environmental resistance, and enhanced stability establishes it as a preferred choice for aerospace, military, and precision engineering applications where reliability and dimensional accuracy are paramount. For components requiring both the strength of 7020 alloy and the dimensional stability needed for precision manufacturing, 7020-T652 delivers optimal performance and processing reliability.

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 2116 gallon liquid totes Special package is available on request.