6069-O Aluminum alloy,Aluminum 6069-O alloy,E FORU

### **Aluminum 6069-O Alloy: Product Introduction** **Overview** Aluminum 6069-O is the annealed temper of the 6069 aluminum alloy, a specialized high-strength member of the Al-Mg-Si alloy family. In the "O" (annealed) condition, the alloy is in its **softest state**, offering **maximum ductility and formability** while maintaining the excellent corrosion resistance characteristics of the 6069 series. This temper is specifically engineered for applications requiring **severe forming operations** before the material undergoes final heat treatment to achieve its high-strength potential. --- #### **1. Chemical Composition (Weight %)** | Element | Minimum (%) | Maximum (%) | Notes | |---------|-------------|-------------|-------| | Silicon (Si) | 0.6 | 1.2 | Optimized for strength development | | Iron (Fe) | - | 0.35 | Controlled impurity | | Copper (Cu) | 0.25 | 0.45 | Enhanced copper for strength | | Manganese (Mn) | 0.20 | 0.40 | Grain structure control | | Magnesium (Mg) | 0.8 | 1.2 | Balanced for Mg₂Si formation | | Chromium (Cr) | 0.10 | 0.20 | Corrosion resistance improvement | | Zinc (Zn) | - | 0.10 | Impurity control | | Titanium (Ti) | - | 0.10 | Grain refiner | | Other (Each) | - | 0.05 | - | | Other (Total) | - | 0.15 | - | | **Aluminum (Al)** | **Balance** | | | --- #### **2. Physical Properties** | Property | Metric Value | Imperial Value | |----------|--------------|----------------| | **Density** | 2.70 g/cm³ | 0.0975 lb/in³ | | **Melting Range** | 580-650 °C | 1076-1202 °F | | **Electrical Conductivity** | 45-50% IACS | 45-50% IACS | | **Thermal Conductivity** | 170-185 W/m·K | 985-1070 BTU·in/(hr·ft²·°F) | | **Coefficient of Thermal Expansion** | 23.6 × 10⁻⁶/°C | 13.1 × 10⁻⁶/°F | | **Modulus of Elasticity** | 68.9 GPa | 10,000 ksi | --- #### **3. Mechanical Properties** **Typical Mechanical Properties for 6069-O:** | Property | Metric Value | Imperial Value | |----------|--------------|----------------| | **Tensile Strength** | 120-160 MPa | 17-23 ksi | | **Yield Strength (0.2% Offset)** | 50-90 MPa | 7-13 ksi | | **Elongation (in 50mm)** | 18-25% | 18-25% | | **Hardness (Brinell)** | 35-45 HB | 35-45 HB | | **Shear Strength** | 80-110 MPa | 12-16 ksi | | **Fatigue Strength** | 60-80 MPa | 9-12 ksi | --- #### **4. International Standards** * **ASTM Standards:** * ASTM B221: Standard Specification for Aluminum and Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles, and Tubes * ASTM B211: Standard Specification for Aluminum and Aluminum-Alloy Bar, Rod, and Wire * **European Standards (EN):** * EN 573-3: Chemical composition * EN 755-2: Mechanical properties for extruded products * **ISO Standards:** * ISO 6361-2: Wrought aluminum and aluminum alloy sheets, strips and plates * ISO 6362-2: Wrought aluminum and aluminum alloy extruded rods/bars, tubes and profiles --- #### **5. Product Applications** **Complex Forming Applications:** - Deep drawn components requiring severe deformation - Complex stamped structural parts - Spin-formed aerospace components - Heavy formed structural elements **Aerospace Manufacturing:** - Aircraft structural pre-forms - Complex shaped aerospace components - Pre-forms for high-strength applications - Aerospace brackets and fittings before heat treatment **Transportation Industry:** - Automotive structural pre-forms - Heavy vehicle components before final treatment - Complex shaped transportation parts - Chassis components requiring forming **Industrial Applications:** - Machinery components requiring severe forming - Heavy equipment pre-forms - Complex industrial parts before heat treatment - Specialized tooling components --- #### **6. Key Characteristics & Advantages** * **Excellent Formability:** Maximum ductility for severe forming operations * **High Strength Potential:** Can be heat treated to achieve tensile strength over 350 MPa (51 ksi) * **Good Corrosion Resistance:** Maintains excellent corrosion resistance in annealed condition * **Superior Workability:** Ideal for complex fabrication processes * **Excellent Weldability:** All common welding methods can be employed * **Outstanding Machinability:** Easy to machine in annealed condition * **Heat Treatable:** Can be solution treated and aged to T6 temper for high strength --- #### **7. Heat Treatment Potential** **After Forming Heat Treatment Sequence:** 1. **Solution Heat Treatment:** 530-540°C (986-1004°F) 2. **Quenching:** Rapid water quenching 3. **Artificial Aging:** 165-175°C (329-347°F) for 8-12 hours **Final T6 Properties After Heat Treatment:** - Tensile Strength: 350-380 MPa (51-55 ksi) - Yield Strength: 310-340 MPa (45-49 ksi) - Elongation: 10-14% --- #### **8. Processing and Fabrication** **Forming Characteristics:** - Excellent for deep drawing operations - Suitable for severe bending and forming - Minimal springback characteristics - Good for stretch forming and spinning **Machining Properties:** - Excellent machinability in annealed condition - Good surface finish achievable - Easy chip formation and disposal - Suitable for high-speed machining operations **Joining Methods:** - Excellent weldability using TIG and MIG methods - Good for resistance welding applications - Suitable for brazing and soldering - Mechanical fastening easily accomplished **Surface Treatment Compatibility:** - Good for anodizing after final heat treatment - Suitable for various coating applications - Excellent surface preparation characteristics - Maintains integrity with proper treatment --- #### **9. Quality Assurance** **Testing and Verification:** - Mechanical property testing - Chemical composition analysis - Formability testing and verification - Surface quality inspection - Dimensional accuracy checks **Certification and Documentation:** - Mill test certificates per international standards - Process control documentation - Full traceability records - Quality compliance certification - Third-party inspection reports available --- **Technical Note:** Aluminum 6069-O serves as the optimal starting condition for manufacturing complex components that require severe forming operations before achieving final high-strength properties through heat treatment. The alloy's enhanced chemistry provides the foundation for significantly higher final strength after T6 treatment compared to standard 6xxx series alloys. This makes 6069-O particularly valuable for applications where complex shapes must be formed first, then heat treated to achieve the high strength levels required for demanding structural applications in aerospace, transportation, and heavy industry. The annealed condition ensures maximum workability while setting the stage for exceptional final properties after proper thermal processing.

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 2016 gallon liquid totes Special package is available on request.