2024-T72 Aluminum alloy,Aluminum 2024-T72 alloy,E FORU

### **Aluminum 2024-T72 Alloy Product Introduction** **Overview** 2024-T72 is a specialized aluminum-copper alloy that has undergone solution heat treatment and artificial averaging to provide exceptional resistance to stress-corrosion cracking (SCC). The T72 temper represents an optimized heat treatment condition that sacrifices some strength to achieve the best possible SCC resistance among 2024 alloy tempers, making it particularly valuable for applications in corrosive environments where reliability is paramount. --- #### **1. Chemical Composition** | Element | Content (%) | |---------|-------------| | **Aluminum (Al)** | Balance | | **Copper (Cu)** | 3.8 - 4.9 | | **Magnesium (Mg)** | 1.2 - 1.8 | | **Manganese (Mn)** | 0.30 - 0.9 | | **Iron (Fe)** | ≤ 0.20 | | **Silicon (Si)** | ≤ 0.15 | | **Zinc (Zn)** | ≤ 0.10 | | **Chromium (Cr)** | ≤ 0.10 | | **Other Elements** | ≤ 0.15 total | --- #### **2. Physical Properties** | Property | Value / Description | |----------|---------------------| | **Density** | 2.78 g/cm³ (0.100 lb/in³) | | **Melting Range** | 500°C - 638°C (932°F - 1180°F) | | **Electrical Conductivity** | 33-38% IACS | | **Thermal Conductivity** | 121 W/m·K | | **Coefficient of Thermal Expansion** | 23.2 × 10⁻⁶/°C (20-100°C) | | **Modulus of Elasticity** | 73.1 GPa (10,600 ksi) | | **Poisson's Ratio** | 0.33 | --- #### **3. Mechanical Properties** **Typical Mechanical Properties:** | Property | Value | |----------|-------| | **Tensile Strength** | 415-450 MPa (60-65 ksi) | | **Yield Strength (0.2% Offset)** | 275-310 MPa (40-45 ksi) | | **Elongation in 2 inches** | 10-15% | | **Shear Strength** | 255-275 MPa (37-40 ksi) | | **Fatigue Strength** | 124 MPa (18 ksi) | | **Brinell Hardness** | 100-110 HB | | **Compressive Yield Strength** | 275-310 MPa (40-45 ksi) | --- #### **4. International Standards** | Standard System | Designation | Product Form | |-----------------|-------------|--------------| | **ASTM** | ASTM B209 | Sheet & Plate | | **AMS** | AMS 4037 | Sheet | | **MIL** | MIL-DTL-6075 | Sheet | | **EN** | EN AW-2024A [T72] | Sheet/Plate | | **ISO** | ISO 6361 | Wrought Products | --- #### **5. Product Applications** **Aerospace Applications:** - Aircraft components operating in marine environments - Wing and fuselage structures for naval aircraft - Components with sustained tensile stresses - Aircraft parts exposed to coastal atmospheres **Marine and Offshore:** - Naval vessel components - Offshore platform structures - Marine aircraft components - Coastal installation equipment **Special Applications:** - Components requiring maximum SCC resistance - Structures with high residual stresses - Critical components in corrosive environments - Applications where long-term reliability is essential --- #### **6. Key Advantages & Considerations** **Advantages:** - ✅ **Excellent Stress-Corrosion Cracking Resistance** - ✅ **Good Corrosion Resistance** in aggressive environments - ✅ **Improved Service Life** in corrosive conditions - ✅ **Stable Mechanical Properties** - ✅ **Reduced Maintenance Requirements** - ✅ **Predictable Long-Term Performance** **Considerations:** - ⚠️ **Reduced Strength** compared to T6 and T8 tempers - ⚠️ **Limited Weldability** - not recommended for fusion welding - ⚠️ **Specialized Application** range - ⚠️ **Higher Cost** due to specialized heat treatment - ⚠️ **Limited Availability** compared to standard tempers --- **Heat Treatment Process** **T72 Temper Process:** 1. **Solution Heat Treatment:** - Temperature: 490-500°C (915-932°F) - Soak time dependent on thickness - Rapid quenching 2. **Artificial Averaging:** - Specific temperature-time cycle - Controlled averaging process - Results in stable microstructure --- **Stress-Corrosion Performance** **Key Characteristics:** - Superior resistance to stress-corrosion cracking - Stable in marine and industrial environments - Suitable for sustained tensile stress applications - Proven performance in aggressive atmospheres --- **Machining and Fabrication** **Machinability:** Good (similar to other 2024 tempers) **Formability:** Limited after final heat treatment **Joining Methods:** Mechanical fastening preferred **Surface Treatment:** Responds well to standard aluminum treatments --- **Conclusion** 2024-T72 aluminum alloy represents a specialized solution for applications where stress-corrosion cracking resistance takes priority over maximum strength. The artificial averaging process in the T72 temper produces a stable microstructure that provides exceptional resistance to SCC, making it the preferred choice for components operating in marine, coastal, and other corrosive environments. While offering lower mechanical properties than T6 or T8 tempers, its superior environmental durability and reliability make it invaluable for critical applications where long-term performance in aggressive conditions is essential. The alloy continues to serve important roles in aerospace, marine, and industrial applications where conventional high-strength aluminum alloys would be susceptible to stress-corrosion failures.

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 1546 gallon liquid totes Special package is available on request.