6061-T6; 6061-T651 Aluminum alloy,Aluminum 6061-T6; 6061-T651 alloy,E FORU

### **6061-T6 / T651 Aluminum Alloy: Product Introduction** **Overview** 6061-T6 and T651 represent the peak-aged temper conditions of the versatile 6061 aluminum-magnesium-silicon alloy. The **T6 temper** indicates material that has been **solution heat-treated and artificially aged** to achieve maximum strength and hardness. The **T651 temper** specifically denotes material that has been **stress-relieved by stretching** after solution heat treatment before artificial aging. These are the most commonly used tempers of 6061 aluminum, offering an exceptional combination of **high strength, good corrosion resistance, and excellent machinability**. --- #### **1. Chemical Composition (Weight %)** | 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** | 43-47% IACS | 43-47% IACS | | **Thermal Conductivity** | 167-175 W/m·K | 970-1015 BTU·in/(hr·ft²·°F) | | **Coefficient of Thermal Expansion** | 23.6 × 10⁻⁶/°C | 13.1 × 10⁻⁶/°F | --- #### **3. Mechanical Properties** **Typical Minimum Mechanical Properties:** | Property | T6 Temper | T651 Temper | |----------|-----------|-------------| | **Tensile Strength** | 310 MPa (45 ksi) | 310 MPa (45 ksi) | | **Yield Strength (0.2% Offset)** | 276 MPa (40 ksi) | 276 MPa (40 ksi) | | **Elongation (in 50mm)** | 8-12% | 8-12% | | **Hardness (Brinell)** | 95-100 HB | 95-100 HB | | **Shear Strength** | 207 MPa (30 ksi) | 207 MPa (30 ksi) | | **Fatigue Strength** | 96.5 MPa (14 ksi) | 96.5 MPa (14 ksi) | **Key Difference:** - **T651** includes stress-relieving by stretching (typically 1-3% permanent set) after solution heat treatment, providing superior dimensional stability for precision machining applications --- #### **4. 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 * **AMS (Aerospace Material Specification):** * AMS 4025: 6061-T6 Sheet * AMS 4026: 6061-T651 Plate * AMS 4046: 6061-T651 Extrusions * **ISO (International Organization for Standardization):** * ISO 6361-2: Wrought aluminum sheets * ISO 6362-2: Extruded products * **EN (European Standards):** * EN 573-3: Chemical composition * EN 755-2: Extruded products --- #### **5. Product Applications** **Aerospace & Defense:** - Aircraft landing gear components - Wing and fuselage structures - Space vehicle components - Military vehicle armor **Transportation Industry:** - Truck chassis and frames - Automotive suspension components - Railway car structures - Bicycle frames and components **Marine Applications:** - Boat hulls and decks - Marine hardware - Ship superstructures - Offshore platform components **Industrial & Consumer:** - Machine frames and bases - Structural components - Pressure vessels - Sporting goods equipment --- #### **6. Key Characteristics & Advantages** * **High Strength-to-Weight Ratio:** Excellent mechanical properties with low density * **Good Corrosion Resistance:** Resists atmospheric and marine environment corrosion * **Excellent Machinability:** Can be readily machined to precise tolerances * **Superior Weldability:** All common welding methods applicable with proper technique * **Good Anodizing Response:** Accepts various surface treatments and coatings * **Dimensional Stability (T651):** Ideal for precision components requiring minimal distortion during machining * **Good Fatigue Strength:** Suitable for dynamic load applications --- #### **7. Heat Treatment Specification** * **Solution Heat Treatment:** 530°C ± 10°C (985°F ± 15°F) for sufficient time * **Quenching:** Rapid quench in water or polymer * **Artificial Aging:** 160-180°C (320-355°F) for 8-18 hours * **Stress Relieving (T651):** 1-3% permanent stretch after solution treatment **Technical Note:** The T651 temper is particularly valuable for applications requiring extensive machining, as the stress-relieving process minimizes warping and distortion during manufacturing. This makes it the preferred choice for precision components in aerospace, defense, and high-performance applications.

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 1995 gallon liquid totes Special package is available on request.