7039-O Aluminum alloy,Aluminum 7039-O alloy，E FORU

### **Aluminum 7039-O Alloy (EN AW-7039) - Product Introduction** **Aluminum 7039-O** is the annealed temper of the 7039 aluminum-zinc-magnesium alloy, characterized by its maximum softness and ductility. The "O" temper designation indicates that the material has been fully annealed to achieve the softest possible condition, making it ideal for applications requiring severe forming, deep drawing, or complex bending operations while maintaining excellent potential for subsequent heat treatment to high strength levels. --- #### **1. Chemical Composition** The chemical composition is balanced for optimal formability and subsequent age-hardening response: | Element | Content (%) (Typical) | Standard Range | |---|---|---| | **Aluminum (Al)** | Balance | Balance | | **Zinc (Zn)** | 3.8 - 4.8 | 3.8 - 4.8 | | **Magnesium (Mg)** | 2.6 - 3.4 | 2.6 - 3.4 | | **Chromium (Cr)** | 0.15 - 0.25 | 0.15 - 0.25 | | **Manganese (Mn)** | 0.10 - 0.40 | 0.10 - 0.40 | | **Copper (Cu)** | ≤ 0.10 | ≤ 0.10 | | **Iron (Fe)** | ≤ 0.40 | ≤ 0.40 | | **Silicon (Si)** | ≤ 0.30 | ≤ 0.30 | | **Zirconium (Zr)** | ≤ 0.05 | ≤ 0.05 | | **Titanium (Ti)** | ≤ 0.10 | ≤ 0.10 | | **Others (Each)** | ≤ 0.05 | ≤ 0.05 | | **Others (Total)** | ≤ 0.15 | ≤ 0.15 | --- #### **2. Physical Properties** Aluminum 7039-O exhibits typical physical properties in annealed condition: | Property | Metric Value | Imperial Value | |---|---|---| | **Density** | 2.78 g/cm³ | 0.100 lb/in³ | | **Melting Range** | 475 - 635 °C | 887 - 1175 °F | | **Electrical Conductivity** | 40-44 % IACS | 40-44 % IACS | | **Thermal Conductivity** | 155-170 W/m·K | 1075-1180 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** The O temper provides maximum ductility with minimum strength: | Property | Metric Value | Imperial Value | |---|---|---| | **Tensile Strength, Ultimate** | 220-260 MPa | 31,900-37,700 psi | | **Tensile Strength, Yield (0.2%)** | 100-140 MPa | 14,500-20,300 psi | | **Elongation in 50mm** | 16-20% | 16-20% | | **Hardness (Brinell)** | 60-70 HB | 60-70 HB | | **Shear Strength** | 140 MPa | 20,300 psi | | **Fatigue Strength** | 90 MPa | 13,100 psi | | **Poisson's Ratio** | 0.33 | 0.33 | --- #### **4. International Standards** Aluminum 7039-O conforms to the following international standards: * **ASTM:** **ASTM B209**, **ASTM B928** * **MIL:** **MIL-DTL-46027** (Armor Plate Specification) * **AMS:** **AMS 4050** (Aerospace Material Specification) * **UNS:** **A97039** * **EN:** **EN AW-7039** (European Standard Equivalent) --- #### **5. Product Applications** Aluminum 7039-O is specifically used for applications requiring severe forming: * **Armor Plate Forming:** Ballistic armor components requiring complex shaping * **Military Vehicle Components:** Armored vehicle parts needing extensive forming * **Aerospace Components:** Complex-shaped aircraft structures * **Marine Structures:** Boat hull components requiring forming * **Transportation Components:** Vehicle structural parts * **Industrial Equipment:** Complex-formed machinery components * **Prototype Development:** Parts requiring easy formability for prototyping * **General Fabrication:** Components requiring extensive forming operations --- #### **6. Key Advantages & Characteristics** * **Maximum Formability:** Excellent for severe bending and deep drawing operations * **Superior Ductility:** Highest elongation characteristics in the 7039 alloy system * **Excellent Weldability:** Can be readily welded in annealed condition * **Age-Hardening Potential:** Can achieve strengths over 400 MPa after heat treatment * **Good Ballistic Base:** Ideal starting condition for armor plate manufacturing * **Workability:** Easy to cut, form, and shape with minimal springback * **Annealing Stability:** Consistent properties throughout the material * **Uniform Properties:** Homogeneous characteristics across sections **Annealing Process:** - Annealing temperature: 415-430°C (780-805°F) - Soaking time: 2-3 hours at temperature - Controlled cooling rate (furnace cooling preferred) - Uniform properties throughout cross-section **Forming Characteristics:** - Minimum bend radius: 0-1T (depending on thickness) - Excellent for deep drawing operations - Low springback characteristics - Suitable for complex stamping and forming **Subsequent Heat Treatment:** - Can be solution heat treated and aged to T6 temper - Typical aging temperature: 120-140°C (250-285°F) - Good response to artificial aging - Can achieve high ballistic properties after forming --- **Quality Assurance:** - Consistent mechanical properties throughout material - Good surface quality with minimal imperfections - Reliable performance in forming operations - Suitable for ballistic applications after heat treatment **Processing Recommendations:** - Store in dry conditions to prevent surface contamination - Handle with care to avoid surface scratches and damage - Complete major forming operations before heat treatment - Use proper tooling and lubrication to avoid galling - Clean surfaces thoroughly before subsequent heat treatment --- **Conclusion:** Aluminum 7039-O offers the ultimate in formability and workability within the 7039 alloy system, making it the preferred choice for applications requiring severe forming operations before final heat treatment. Its ability to be subsequently heat treated to high strength levels with good ballistic properties provides manufacturers with exceptional flexibility in production processes. The alloy's combination of maximum ductility, good weldability, and excellent age-hardening potential makes it invaluable for complex formed components across military, aerospace, and general fabrication applications. For manufacturers requiring maximum formability with the option for subsequent strengthening to high strength levels with ballistic capabilities, Aluminum 7039-O delivers unparalleled processing flexibility and performance potential.

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 2134 gallon liquid totes Special package is available on request.