6351-T4; 6351-T451 Aluminum alloy,Aluminum 6351-T4; 6351-T451 alloy,E FORU

### **Aluminum 6351-T4 / 6351-T451 Alloy (EN AW-6351) - Product Introduction** **Aluminum 6351-T4/T451** is a heat-treatable aluminum-magnesium-silicon alloy supplied in solution heat-treated and naturally aged condition. The T4 temper provides a combination of good formability with moderate strength, while the T451 temper indicates stress-relieving by stretching after solution heat treatment to improve dimensional stability for machining and fabrication. --- #### **1. Chemical Composition** The chemical composition follows established standards for 6351 alloy: | Element | Content (%) (Typical) | Standard Range | |---|---|---| | **Aluminum (Al)** | Balance | Balance | | **Magnesium (Mg)** | 0.40 - 0.8 | 0.40 - 0.8 | | **Silicon (Si)** | 0.70 - 1.3 | 0.70 - 1.3 | | **Iron (Fe)** | ≤ 0.50 | ≤ 0.50 | | **Copper (Cu)** | ≤ 0.10 | ≤ 0.10 | | **Manganese (Mn)** | 0.40 - 0.8 | 0.40 - 0.8 | | **Chromium (Cr)** | ≤ 0.20 | ≤ 0.20 | | **Zinc (Zn)** | ≤ 0.20 | ≤ 0.20 | | **Titanium (Ti)** | ≤ 0.10 | ≤ 0.10 | | **Others (Each)** | ≤ 0.05 | ≤ 0.05 | | **Others (Total)** | ≤ 0.15 | ≤ 0.15 | --- #### **2. Physical Properties** | Property | Metric Value | Imperial Value | |---|---|---| | **Density** | 2.71 g/cm³ | 0.0979 lb/in³ | | **Melting Range** | 580 - 650 °C | 1076 - 1202 °F | | **Electrical Conductivity** | 42-46 % IACS | 42-46 % IACS | | **Thermal Conductivity** | 175-190 W/m·K | 1215-1320 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 | --- #### **3. Mechanical Properties** **T4 Temper Properties:** - **Tensile Strength:** 205-240 MPa (30,000-35,000 psi) - **Yield Strength (0.2% Offset):** 110-150 MPa (16,000-22,000 psi) - **Elongation:** 16-22% - **Hardness (Brinell):** 65-75 HB **T451 Temper Properties:** - **Tensile Strength:** 210-245 MPa (30,500-35,500 psi) - **Yield Strength (0.2% Offset):** 115-155 MPa (16,700-22,500 psi) - **Elongation:** 15-20% - **Hardness (Brinell):** 68-78 HB *Note: T451 offers improved dimensional stability for machining compared to T4.* --- #### **4. International Standards** - **ASTM:** ASTM B221, ASTM B316 - **EN:** EN AW-6351 (3.3207) - **ISO:** ISO 209 AlMgSi - **AMS:** AMS 4115 - **SAE:** SAE J454 --- #### **5. Product Applications** **T4 Temper Applications:** - **Automotive Parts:** Body panels, structural components - **Marine Components:** Boat fittings, marine hardware - **Architectural Extrusions:** Window frames, door frames - **General Fabrication:** Formed and shaped components - **Transportation:** Truck and trailer components **T451 Temper Applications:** - **Precision Machined Parts:** Components requiring stable dimensions - **Aerospace Components:** Non-critical structural parts - **Hydraulic Fittings:** Valve bodies, connectors - **Machine Parts:** Jigs, fixtures, and tooling components - **Electrical Hardware:** Connectors, mounting brackets --- #### **6. Key Advantages & Characteristics** **T4 Temper Advantages:** - **Excellent Formability:** Ideal for bending and forming operations - **Good Weldability:** Can be readily welded using all standard methods - **Moderate Strength:** Suitable for many structural applications - **Corrosion Resistance:** Good resistance to atmospheric exposure - **Age Hardening Capability:** Can be naturally aged or further heat treated **T451 Temper Additional Advantages:** - **Improved Dimensional Stability:** Stress-relieved for better machining performance - **Reduced Distortion:** Minimal warping during and after machining - **Predictable Machining:** Consistent performance in fabrication - **Better Flatness:** Improved stability for precision applications **Heat Treatment Considerations:** - Solution heat treatment temperature: 515-540°C (960-1000°F) - Natural aging occurs at room temperature over several days - Can be artificially aged to T6 temper for higher strength **Safety Note:** Proper heat treatment and quality control are essential as 6351 alloy has known susceptibility to stress corrosion cracking if not properly processed. --- **Conclusion:** Aluminum 6351-T4/T451 offers an excellent combination of formability, weldability, and moderate strength for fabrication-intensive applications. The T451 variant provides additional dimensional stability for precision machining requirements. While this alloy provides good general performance, appropriate design and processing controls should be implemented to ensure long-term reliability in critical 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 2074 gallon liquid totes Special package is available on request.