6951-O Aluminum alloy,Aluminum 6951-O alloy，E FORU

### **Aluminum 6951-O Alloy (EN AW-6951-O) - Product Introduction** **Aluminum 6951-O** is the annealed temper of the 6951 aluminum-magnesium-silicon 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. --- #### **1. Chemical Composition** The chemical composition is balanced for optimal formability and subsequent heat treatment response: | Element | Content (%) (Typical) | Standard Range (ASTM/EN) | |---|---|---| | **Aluminum (Al)** | Balance | Balance | | **Magnesium (Mg)** | 0.50 - 0.8 | 0.50 - 0.8 | | **Silicon (Si)** | 0.25 - 0.6 | 0.25 - 0.6 | | **Iron (Fe)** | ≤ 0.25 | ≤ 0.25 | | **Copper (Cu)** | 0.10 - 0.30 | 0.10 - 0.30 | | **Manganese (Mn)** | ≤ 0.10 | ≤ 0.10 | | **Chromium (Cr)** | ≤ 0.10 | ≤ 0.10 | | **Zinc (Zn)** | ≤ 0.10 | ≤ 0.10 | | **Titanium (Ti)** | ≤ 0.05 | ≤ 0.05 | | **Others (Each)** | ≤ 0.05 | ≤ 0.05 | | **Others (Total)** | ≤ 0.15 | ≤ 0.15 | --- #### **2. Physical Properties** Aluminum 6951-O exhibits typical aluminum characteristics in annealed condition: | Property | Metric Value | Imperial Value | |---|---|---| | **Density** | 2.70 g/cm³ | 0.0975 lb/in³ | | **Melting Range** | 610 - 650 °C | 1130 - 1202 °F | | **Electrical Conductivity** | 48-52 % IACS | 48-52 % IACS | | **Thermal Conductivity** | 185-200 W/m·K | 1285-1390 BTU·in/(hr·ft²·°F) | | **Coefficient of Thermal Expansion** | 23.4 × 10⁻⁶/K | 13.0 × 10⁻⁶/°F | | **Modulus of Elasticity** | 69 GPa | 10,000 ksi | | **Shear Modulus** | 26 GPa | 3,770 ksi | --- #### **3. Mechanical Properties** The O temper provides maximum ductility with minimum strength: | Property | Metric Value | Imperial Value | |---|---|---| | **Tensile Strength, Ultimate** | 95-125 MPa | 13,800-18,100 psi | | **Tensile Strength, Yield (0.2% Offset)** | 35-65 MPa | 5,100-9,400 psi | | **Elongation in 50mm** | 24-30% | 24-30% | | **Hardness (Brinell)** | 28-38 HB | 28-38 HB | | **Shear Strength** | 70 MPa | 10,200 psi | | **Fatigue Strength** | 45 MPa | 6,500 psi | | **Poisson's Ratio** | 0.33 | 0.33 | --- #### **4. International Standards** Aluminum 6951-O conforms to the following international standards: * **ASTM:** **ASTM B221** for Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles, and Tubes * **EN:** **EN AW-6951** (European Standard Equivalent) * **ISO:** **AlMgSi** under ISO 209 * **AMS:** **AMS 4115** (Aerospace Material Specification) * **SAE:** **SAE J454** (Society of Automotive Engineers) --- #### **5. Product Applications** Aluminum 6951-O is specifically used for applications requiring severe forming: * **Heat Exchanger Components:** Fins, tubes, and complex heat transfer parts * **Deep Drawn Parts:** Components requiring severe deep drawing operations * **Complex Formed Shapes:** Intricate architectural and decorative elements * **Electrical Components:** Bus bar components requiring forming * **Prototype Development:** Parts requiring easy formability for prototyping * **Automotive Parts:** Complex-shaped trim and structural components * **Lighting Components:** Reflector sheets and formed lighting parts * **General Fabrication:** Parts requiring extensive forming and shaping --- #### **6. Key Advantages & Characteristics** * **Maximum Formability:** Excellent for severe bending and deep drawing operations * **Superior Ductility:** Highest elongation characteristics in the 6951 alloy system * **Excellent Surface Quality:** Good surface characteristics for subsequent finishing * **Annealing Stability:** Consistent properties throughout the material * **Workability:** Easy to cut, form, and shape with minimal springback * **Heat Treatable:** Can be subsequently heat treated to T4, T5, or T6 tempers * **Weldability:** Good welding characteristics in annealed condition * **Machinability:** Good machining properties with proper tooling **Annealing Process:** - Annealing temperature: 340-360°C (645-680°F) - Soaking time: 2-3 hours at temperature - Controlled cooling rate (furnace cooling or air cooling) - Uniform properties throughout cross-section **Forming Characteristics:** - Minimum bend radius: 0-0.5T (depending on thickness and orientation) - Excellent for deep drawing operations - Low springback characteristics - Suitable for complex forming and stamping operations **Subsequent Heat Treatment:** - Can be naturally aged to T4 temper after forming - Can be artificially aged to T5 or T6 temper - Good response to solution heat treatment - Suitable for complete T4 to T6 heat treatment cycle --- **Processing Recommendations:** - Store in dry conditions to prevent surface contamination - Handle with care to avoid surface scratches and damage - Clean surfaces thoroughly before subsequent heat treatment - Use proper tooling and lubrication to avoid galling during forming - Complete major forming operations before any heat treatment **Quality Assurance:** - Consistent mechanical properties throughout material - Good surface quality with minimal imperfections - Reliable performance in forming operations - Suitable for quality-critical fabrication processes --- **Conclusion:** Aluminum 6951-O offers the ultimate in formability and workability within the 6951 alloy system, making it the preferred choice for applications requiring severe forming operations. Its ability to be subsequently heat treated to higher strength tempers provides manufacturers with exceptional flexibility in production processes. The alloy's combination of maximum ductility, good surface quality, and heat treatability makes it invaluable for complex formed components across heat exchange, automotive, architectural, and general fabrication applications. For manufacturers requiring maximum formability with the option for subsequent strengthening, Aluminum 6951-O delivers unparalleled performance and processing flexibility.

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 2092 gallon liquid totes Special package is available on request.