7475-T7351 Aluminum alloy,Aluminum 7475-T7351 alloy，E FORU

### **Aluminum 7475-T7351 Alloy Technical Datasheet** --- #### **1. Product Overview** **7475-T7351** is a high-strength aluminum alloy from the Al-Zn-Mg-Cu (7xxx) series, specifically heat-treated to achieve superior stress corrosion cracking (SCC) resistance while maintaining excellent strength and fracture toughness. The T7351 temper indicates the material has undergone solution heat treatment, stress-relieving by stretching (1.5-3% permanent set), and artificial aging to an over-aged condition for enhanced corrosion resistance. --- #### **2. Chemical Composition (Weight %)** | Element | Content | Role | |---------|----------|------| | Zinc (Zn) | 5.2-6.2 | Primary strengthening | | Magnesium (Mg) | 1.9-2.6 | Strengthening phase formation | | Copper (Cu) | 1.2-1.9 | Strength & corrosion resistance | | Chromium (Cr) | 0.18-0.25 | Grain structure control | | Iron (Fe) | ≤0.12 | Impurity control | | Silicon (Si) | ≤0.10 | Impurity control | | Manganese (Mn) | ≤0.06 | Impurity control | | Titanium (Ti) | ≤0.05 | Grain refinement | | Other Elements | ≤0.05 each | - | | Aluminum (Al) | Balance | Base metal | --- #### **3. Physical Properties** | Property | Value | |----------|-------| | Density | 2.80 g/cm³ (0.101 lb/in³) | | Melting Range | 475-635°C (887-1175°F) | | Thermal Conductivity | 130 W/m·K | | Electrical Conductivity | 35-42% IACS | | Modulus of Elasticity | 71 GPa (10.3×10⁶ psi) | | Coefficient of Thermal Expansion | 23.4×10⁻⁶/°C (20-100°C) | --- #### **4. Mechanical Properties** **Typical Values at Room Temperature:** - **Tensile Ultimate Strength**: 483-510 MPa (70-74 ksi) - **Tensile Yield Strength (0.2% Offset)**: 400-434 MPa (58-63 ksi) - **Compressive Yield Strength**: 400 MPa (58 ksi) - **Elongation**: 12-14% (in 50 mm) - **Shear Strength**: 276 MPa (40 ksi) - **Fatigue Strength** (R.R. Moore test): 138 MPa (20 ksi) - **Fracture Toughness (K_Ic)**: 33-36 MPa√m --- #### **5. International Standards** **Primary Specifications:** - **AMS 4202**: Aluminum Alloy 7475-T7351 Plate - **ASTM B209**: Standard Specification for Aluminum Alloy Sheet and Plate - **ASTM B247**: Aluminum Alloy Die Forgings and Forging Stock **Additional Standards:** - **ISO 6361**: Wrought Aluminum and Aluminum Alloy Sheets - **EN 485**: Aluminum and Aluminum Alloys - Sheet, Strip and Plate - **MIL-DTL-897E**: Military Specification for Aluminum Alloy Plate --- #### **6. Product Applications** **Aerospace & Defense:** - Aircraft wing skins and fuselage panels - Space vehicle structural components - Military aircraft bulkheads and frames - Helicopter structural members - Missile components **Transportation & Industrial:** - High-performance automotive components - Racing bicycle frames - Marine structural components - Precision machinery parts --- #### **7. Key Characteristics** **Advantages:** - Excellent stress corrosion cracking resistance - Superior fracture toughness - Good fatigue performance - Excellent strength-to-weight ratio - Enhanced exfoliation corrosion resistance - Good machinability in aged condition - Stable mechanical properties **Limitations:** - Slightly lower strength than T651 temper - Requires protective coatings in severe environments - Higher cost than standard 7xxx alloys - Limited weldability --- #### **8. Processing Characteristics** **Machining:** - Good machinability in T7351 condition - Recommended: Carbide tools with positive rake angles - Use adequate cooling for optimal finish **Heat Treatment:** - Solution Treatment: 470-490°C (878-914°F) - Aging: Two-stage aging process at 100-120°C and 150-170°C - Stress Relief: 1.5-3% stretching after solution treatment **Forming:** - Best formability in annealed condition - Limited forming possible in T7351 temper - Hot forming recommended for complex shapes --- #### **9. Corrosion Resistance** - **Stress Corrosion Cracking**: Excellent resistance in short transverse direction - **Exfoliation Corrosion**: Resistant (rating EB per ASTM G34) - **General Corrosion**: Requires protective coatings for severe environments - **Galvanic Corrosion**: Compatible with proper isolation --- #### **10. Quality Assurance** **Testing Requirements:** - Ultrasonic inspection per ASTM E114 - Stress corrosion testing per ASTM G47 - Fracture toughness testing per ASTM E399 - Mechanical property verification - Corrosion resistance validation **Certification:** - Mill certification to applicable standards - Full traceability to original heat lot - Third-party verification available --- #### **Conclusion** 7475-T7351 aluminum alloy represents an optimized solution for applications requiring the perfect balance of high strength, exceptional corrosion resistance, and superior damage tolerance. The T7351 temper specifically addresses stress corrosion cracking concerns while maintaining excellent mechanical properties, making it particularly valuable for aerospace structures, defense applications, and other critical components operating in demanding environments. Its controlled composition and specialized heat treatment ensure reliable performance where safety and longevity are paramount considerations.

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 2216 gallon liquid totes Special package is available on request.