7020-T6 Aluminum alloy,Aluminum 7020-T6 alloy，E FORU

### **Aluminum 7020-T6 Alloy (EN AW-7020) - Product Introduction** **Aluminum 7020-T6** is a high-strength, heat-treatable aluminum-zinc-magnesium alloy in the solution heat-treated and artificially aged condition. This alloy is particularly known for its excellent combination of strength, weldability, and corrosion resistance, making it suitable for a wide range of structural applications, especially in transportation and marine industries. --- #### **1. Chemical Composition** The chemical composition is balanced for optimal strength and corrosion resistance: | 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-T6 exhibits excellent physical properties for structural applications: | Property | Metric Value | Imperial Value | |---|---|---| | **Density** | 2.78 g/cm³ | 0.100 lb/in³ | | **Melting Range** | 475 - 635 °C | 887 - 1175 °F | | **Electrical Conductivity** | 38-42 % IACS | 38-42 % IACS | | **Thermal Conductivity** | 150-165 W/m·K | 1040-1145 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-T6 Mechanical Properties:** | Property | Metric Value | Imperial Value | |---|---|---| | **Tensile Strength, Ultimate** | 350-400 MPa | 50,800-58,000 psi | | **Tensile Strength, Yield (0.2%)** | 280-330 MPa | 40,600-47,900 psi | | **Elongation in 50mm** | 10-14% | 10-14% | | **Hardness (Brinell)** | 95-105 HB | 95-105 HB | | **Shear Strength** | 205 MPa | 29,700 psi | | **Fatigue Strength** | 125 MPa | 18,100 psi | | **Fracture Toughness** | 35-40 MPa·√m | 32-36 ksi·√in | --- #### **4. International Standards** Aluminum 7020-T6 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 * **EN 13957:** Aluminum and aluminum alloys - Extruded round, coiled and drawn wire * **ASTM:** **ASTM B221** for general extrusion applications * **JIS:** **JIS H 4040** (A7020) * **GB/T:** **GB/T 3190** (Chinese National Standard) --- #### **5. Product Applications** Aluminum 7020-T6 is widely used in structural applications: * **Transportation Vehicles:** Railway car bodies, truck chassis components * **Marine Structures:** Boat hulls, marine platforms, offshore structures * **Bridge Components:** Pedestrian bridges, lightweight bridge structures * **Military Applications:** Military vehicle structures, defense equipment * **Automotive Components:** Vehicle frames, structural reinforcements * **Industrial Equipment:** Machinery frames, conveyor systems * **Sports Equipment:** Bicycle frames, sports infrastructure * **Architectural Structures:** Building frameworks, structural supports --- #### **6. Key Advantages & Characteristics** * **Excellent Weldability:** Can be readily welded using conventional methods with minimal strength loss * **Good Corrosion Resistance:** Particularly resistant to seawater and marine environments * **High Strength-to-Weight Ratio:** Excellent mechanical properties for weight-sensitive applications * **Good Fatigue Performance:** Superior resistance to cyclic loading conditions * **Stress Corrosion Resistance:** Good resistance to stress corrosion cracking * **Extrudability:** Suitable for manufacturing complex profiles * **Machinability:** Good machining characteristics in T6 condition * **Formability:** Can be formed using appropriate techniques **Heat Treatment Process:** - Solution Treatment: 465-480°C (870-900°F) - Rapid quenching in water or air - Artificial Aging: 120-140°C (250-285°F) for 16-24 hours - Air cooling to room temperature **Welding Performance:** - Excellent weldability using MIG and TIG methods - Minimal degradation in heat-affected zone - Can be welded without post-weld heat treatment - Compatible with standard aluminum filler wires **Corrosion Performance:** - Good resistance to seawater corrosion - Adequate stress corrosion cracking resistance - Suitable for marine and industrial environments - Can be used with protective coatings for severe conditions --- **Quality Assurance:** - Consistent mechanical properties - Controlled chemical composition - Regular mechanical testing - Compliance with international standards **Processing Recommendations:** - Use carbide tools for machining operations - Follow recommended welding procedures - Store in appropriate conditions - Handle with care to prevent surface damage --- **Conclusion:** Aluminum 7020-T6 offers an excellent balance of strength, weldability, and corrosion resistance, making it particularly valuable for transportation, marine, and structural applications. Its superior welding characteristics combined with good mechanical properties and environmental durability establish it as a preferred choice for fabricated structures and weight-sensitive applications. The alloy's combination of performance characteristics and manufacturing flexibility ensures reliable service in demanding applications across various industries, particularly where welding fabrication is required and corrosion resistance is important.

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 2115 gallon liquid totes Special package is available on request.