6061-O Aluminum alloy,Aluminum 6061-O alloy,E FORU

### **6061-O Aluminum Alloy: Product Introduction** **Overview** 6061-O aluminum alloy is the annealed temper of the versatile 6061 aluminum-magnesium-silicon alloy. In this "O" (annealed) condition, the alloy is in its **softest state**, offering **maximum ductility and formability** while maintaining the excellent corrosion resistance and weldability characteristic of the 6061 series. This temper is ideal for applications requiring severe forming operations where high strength is not the primary requirement during the manufacturing process. --- #### **1. Chemical Composition (Weight %)** The chemical composition follows standard 6061 alloy specifications. | Element | Minimum (%) | Maximum (%) | | :--- | :--- | :--- | | Silicon (Si) | 0.40 | 0.8 | | Iron (Fe) | - | 0.7 | | Copper (Cu) | 0.15 | 0.40 | | Manganese (Mn) | - | 0.15 | | Magnesium (Mg) | 0.8 | 1.2 | | Chromium (Cr) | 0.04 | 0.35 | | Zinc (Zn) | - | 0.25 | | Titanium (Ti) | - | 0.15 | | Other (Each) | - | 0.05 | | Other (Total) | - | 0.15 | | **Aluminum (Al)** | **Balance** | | --- #### **2. Physical Properties** | Property | Typical Metric Value | Imperial Value | | :--- | :--- | :--- | | **Density** | 2.70 g/cm³ | 0.0975 lb/in³ | | **Melting Range** | 580 - 650 °C | 1075 - 1200 °F | | **Electrical Conductivity** | 47-50% IACS | 47-50% IACS | | **Thermal Conductivity** | 170-190 W/m·K | 985-1100 BTU·in/(hr·ft²·°F) | | **Coefficient of Thermal Expansion** | 23.6 × 10⁻⁶/°C | 13.1 × 10⁻⁶/°F | --- #### **3. Mechanical Properties (O Temper)** The annealed condition provides minimum strength with maximum formability. | Property | Metric Value | Imperial Value | | :--- | :--- | :--- | | **Tensile Strength** | 125 MPa (min) | 18 ksi (min) | | **Yield Strength (0.2% Offset)** | 55 MPa (min) | 8 ksi (min) | | **Elongation (in 50mm)** | 20-25% | 20-25% | | **Hardness (Brinell)** | 30-35 HB | 30-35 HB | | **Shear Strength** | 85 MPa | 12 ksi | | **Fatigue Strength** | 60 MPa | 9 ksi | --- #### **4. International Standards** 6061-O is recognized in major international standards: * **ASTM (USA):** * ASTM B209: Sheet and Plate * ASTM B211: Bar, Rod, and Wire * ASTM B221: Extruded Bars, Rods, Profiles, and Tubes * ASTM B210: Drawn Seamless Tubes * **ISO (International Organization for Standardization):** * ISO 6361-2: Wrought aluminum and aluminum alloy sheets * ISO 6362-2: Wrought aluminum extruded products * **EN (European Standards):** * EN 573-3: Chemical composition * EN 755-2: Extruded products * **JIS (Japanese Industrial Standards):** * JIS H4040: Aluminum and aluminum alloy bars and wires --- #### **5. Product Applications** 6061-O is specified for applications requiring extensive forming before heat treatment: * **Complex Formed Components:** * Deep drawn housings and enclosures * *Complex brackets and structural supports* * *Tanks and pressure vessels* * **Heat Treatment Precursors:** * *Components that will be solution heat-treated and aged to T6 temper after forming* * *Forgings requiring subsequent heat treatment* * **General Manufacturing:** * *Prototype development and custom fabrications* * *Non-structural applications where formability is prioritized over strength* * **Architectural Applications:** * *Decorative elements requiring severe bending* * *Custom architectural features* --- #### **6. Key Characteristics & Advantages** * **Excellent Formability:** Can undergo severe bending, deep drawing, and stretching operations without cracking * **Superior Ductility:** Highest elongation capability of all 6061 tempers * **Good Corrosion Resistance:** Maintains the excellent corrosion resistance of 6061 series alloys * **Excellent Weldability:** All common welding methods can be employed successfully * **Heat Treatable:** Can be solution heat-treated and aged to T6 temper for high strength after forming * **Good Machinability:** Softer material allows for easier machining operations * **High Electrical and Thermal Conductivity:** Better conductivity than higher strength tempers --- #### **7. Heat Treatment Considerations** A significant advantage of 6061-O is its ability to be heat treated after forming: * **Solution Heat Treatment:** 530°C (985°F) for sufficient time followed by rapid quenching * **Artificial Aging:** 160-180°C (320-355°F) for 8-18 hours to achieve T6 properties * **Final Properties:** After proper heat treatment, mechanical properties equivalent to 6061-T6 can be obtained (Tensile: 310 MPa, Yield: 276 MPa) **Note:** The O temper represents the starting point for all heat treatment processes of 6061 aluminum alloy, making it fundamental to understanding the alloy's full capabilities.

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 1993 gallon liquid totes Special package is available on request.