7031 Aluminum alloy,Aluminum 7031 alloy，E FORU

### **Aluminum 7031 Alloy (EN AW-7031) - Product Introduction** **Aluminum 7031** is a high-strength, heat-treatable aluminum-zinc-magnesium-copper alloy specifically developed for applications requiring excellent strength combined with good stress corrosion resistance. This advanced 7xxx series alloy offers superior mechanical properties and enhanced durability, making it suitable for demanding aerospace, defense, and high-performance structural applications. --- #### **1. Chemical Composition** The chemical composition is carefully balanced for optimal performance: | Element | Content (%) (Typical) | Standard Range | |---|---|---| | **Aluminum (Al)** | Balance | Balance | | **Zinc (Zn)** | 5.5 - 6.5 | 5.5 - 6.5 | | **Magnesium (Mg)** | 2.2 - 2.9 | 2.2 - 2.9 | | **Copper (Cu)** | 1.0 - 1.7 | 1.0 - 1.7 | | **Zirconium (Zr)** | 0.10 - 0.18 | 0.10 - 0.18 | | **Manganese (Mn)** | 0.05 - 0.15 | 0.05 - 0.15 | | **Chromium (Cr)** | 0.08 - 0.16 | 0.08 - 0.16 | | **Iron (Fe)** | ≤ 0.15 | ≤ 0.15 | | **Silicon (Si)** | ≤ 0.12 | ≤ 0.12 | | **Titanium (Ti)** | ≤ 0.05 | ≤ 0.05 | | **Others (Each)** | ≤ 0.05 | ≤ 0.05 | | **Others (Total)** | ≤ 0.15 | ≤ 0.15 | --- #### **2. Physical Properties** Aluminum 7031 exhibits excellent physical properties for high-strength applications: | Property | Metric Value | Imperial Value | |---|---|---| | **Density** | 2.81 g/cm³ | 0.101 lb/in³ | | **Melting Range** | 475 - 635 °C | 887 - 1175 °F | | **Electrical Conductivity** | 35-39 % IACS (T6 Temper) | 35-39 % IACS | | **Thermal Conductivity** | 140-155 W/m·K | 970-1075 BTU·in/(hr·ft²·°F) | | **Coefficient of Thermal Expansion** | 23.6 × 10⁻⁶/K | 13.1 × 10⁻⁶/°F | | **Modulus of Elasticity** | 71 GPa | 10,300 ksi | | **Shear Modulus** | 27 GPa | 3,920 ksi | --- #### **3. Mechanical Properties** Typical mechanical properties for common tempers: | Temper | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB) | |---|---|---|---|---| | **T6** | 540-590 | 470-520 | 10-14 | 145-155 | | **T651** | 550-600 | 480-530 | 9-13 | 148-158 | | **T7351** | 500-550 | 430-480 | 11-15 | 135-145 | | **T7651** | 520-570 | 450-500 | 10-14 | 140-150 | --- #### **4. International Standards** Aluminum 7031 complies with the following international standards: * **EN:** **EN AW-7031** (3.4338) * **ASTM:** **ASTM B209**, **ASTM B247** * **ISO:** **AlZn6MgCu** under ISO 209 * **AMS:** **AMS 4120** (Aerospace Material Specification) * **UNS:** **A97031** * **MIL:** **MIL-A-22771** --- #### **5. Product Applications** Aluminum 7031 is used in demanding high-performance applications: * **Aerospace Structures:** Aircraft wing components, fuselage frames, bulkheads * **Military Equipment:** Defense system components, military vehicle structures * **Space Applications:** Satellite structures, space vehicle components * **High-Performance Automotive:** Racing chassis, suspension systems * **Marine Defense:** Naval vessel components, marine structures * **Industrial Machinery:** High-stress machinery components, press frames * **Sports Equipment:** Professional competition equipment, high-end bicycle frames * **Transportation:** High-strength vehicle structural components --- #### **6. Key Advantages & Characteristics** * **High Strength-to-Weight Ratio:** Excellent mechanical properties with low density * **Superior Stress Corrosion Resistance:** Enhanced resistance to stress corrosion cracking * **Excellent Fatigue Performance:** Outstanding resistance to cyclic loading conditions * **Good Fracture Toughness:** Enhanced damage tolerance characteristics * **Excellent Heat Treatability:** Responsive to artificial aging treatments * **Good Machinability:** Suitable for precision manufacturing operations * **Weldability:** Can be welded using specialized techniques * **Thermal Stability:** Maintains properties at moderate temperatures **Heat Treatment Characteristics:** - Solution treatment temperature: 465-475°C (870-885°F) - Artificial aging temperature: 120-140°C (250-285°F) - T7-type tempers provide improved corrosion resistance - Complex aging sequences for property optimization **Corrosion Performance:** - Excellent stress corrosion cracking resistance - Good exfoliation corrosion resistance - Suitable for severe environmental conditions - Can be enhanced with surface treatments **Manufacturing Characteristics:** - Good forgeability and extrudability - Suitable for complex structural shapes - Can be machined using conventional and CNC methods - Weldable using specialized techniques including FSW --- **Quality Assurance:** - Stringent chemical composition controls - Comprehensive mechanical testing protocols - Advanced non-destructive evaluation methods - Full traceability from raw material to finished product - Regular quality audits and certification **Processing Recommendations:** - Use premium cutting tools for machining operations - Implement controlled heat treatment processes - Follow established welding procedures - Apply appropriate surface protection when required - Maintain clean manufacturing environment --- **Conclusion:** Aluminum 7031 represents an advanced high-strength aluminum alloy that delivers an exceptional balance of mechanical properties, corrosion resistance, and manufacturing capabilities. Its optimized composition and heat treatment response make it particularly valuable for critical aerospace, defense, and high-performance engineering applications where reliability and performance are paramount. The alloy's ability to maintain excellent properties under demanding conditions, combined with its good processing characteristics, establishes it as a preferred material for engineers and designers working on cutting-edge structural applications. For projects requiring the ultimate in aluminum alloy performance with balanced characteristics, Aluminum 7031 provides outstanding value and 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 2126 gallon liquid totes Special package is available on request.