7175-T7351 Aluminum alloy,Aluminum 7175-T7351 alloy，E FORU

### **7175-T7351 Aluminum Alloy: High-Strength Corrosion Resistant Alloy** **7175-T7351 Aluminum Alloy** is a high-strength aluminum-zinc-magnesium-copper alloy in a specific temper condition that provides an excellent combination of strength and corrosion resistance. The T7351 temper indicates solution heat treatment, stress relieving by stretching, and artificial aging to achieve optimal properties for aerospace applications. --- #### **1. Chemical Composition** | Element | Content (%) (Typical) | Role in the Alloy | | :--- | :--- | :--- | | **Zinc (Zn)** | 5.1 - 6.1 | Primary strengthening element through formation of MgZn₂ precipitates | | **Magnesium (Mg)** | 2.1 - 2.9 | Enhances strength and age-hardening response | | **Copper (Cu)** | 1.2 - 2.0 | Improves strength and stress corrosion cracking resistance | | **Chromium (Cr)** | 0.18 - 0.28 | Controls grain structure and improves toughness | | **Iron (Fe)** | ≤ 0.20 | Impurity - controlled for improved consistency | | **Silicon (Si)** | ≤ 0.15 | Impurity - controlled for improved ductility | | **Manganese (Mn)** | ≤ 0.10 | - | | **Titanium (Ti)** | ≤ 0.10 | - | | **Other Elements** | ≤ 0.05 each; ≤ 0.15 total | - | | **Aluminum (Al)** | Balance | Base metal | --- #### **2. Understanding the T7351 Temper** The T7351 temper designation indicates: - **T7**: Solution heat-treated and artificially over-aged - **3**: Stress-relieved by stretching (1-3% permanent set) - **51**: Specific aging treatment for plate products **Key Characteristics:** - Enhanced corrosion resistance compared to T6 temper - Reduced residual stresses - Improved dimensional stability - Good balance of strength and toughness --- #### **3. Physical Properties** | Property | Value / Description | | | | | **Density** | 2.80 g/cm³ (0.101 lb/in³) | | **Melting Range** | 477°C - 638°C (890°F - 1180°F) | | **Electrical Conductivity** | 40-44% IACS | | **Thermal Conductivity** | 135-155 W/m·K | | **Coefficient of Thermal Expansion** | 23.6 × 10⁻⁶/°C (20-100°C) | | **Modulus of Elasticity** | 71 GPa (10.3 × 10⁶ psi) | --- #### **4. Mechanical Properties (Typical)** | Property | Typical Value | | | | | **Tensile Ultimate Strength** | 470 - 510 MPa (68 - 74 ksi) | | **Tensile Yield Strength (0.2% Offset)** | 400 - 440 MPa (58 - 64 ksi) | | **Elongation** | 10-14% | | **Compression Yield Strength** | 390 - 430 MPa (57 - 62 ksi) | | **Shear Strength** | 270 - 300 MPa (39 - 44 ksi) | | **Fatigue Strength** | 140 - 170 MPa (20 - 25 ksi) | | **Brinell Hardness** | 120 - 135 HB | --- #### **5. Product Applications** **7175-T7351** is primarily used in aerospace plate applications: * **Aircraft Structures:** * Wing skins and planks * Fuselage frames * Bulkhead components * Structural brackets * Support structures * **Military Applications:** * Military aircraft components * Defense system structures * Armored vehicle components * **Marine Applications:** * Marine aircraft components * Ship and boat structures * **Industrial Applications:** * High-strength machinery components * Structural plate applications --- #### **6. International Standards** | Standard Body | Designation | Specification | | | | | | **Aluminum Association** | 7175-T7351 | AA Teal Sheets | | **ASTM International** | 7175-T7351 | ASTM B209 | | **Aerospace (AMS)** | 7175-T7351 | AMS 4104 | | **European Norm** | EN AW-7175 T7351 | EN 485-2 | | **Unified Numbering System** | A97175 | UNS Registry | --- #### **7. Key Characteristics** **Advantages:** * **Excellent stress corrosion cracking resistance** * **Good exfoliation corrosion resistance** * **High strength-to-weight ratio** * **Superior dimensional stability** * **Good fatigue performance** * **Reduced residual stresses** **Limitations:** * Lower strength than T6 temper * Higher cost due to additional processing * Limited to plate product forms * Requires controlled heat treatment --- #### **8. Manufacturing Considerations** * **Machining:** Good machinability with reduced distortion * **Forming:** Limited formability in aged condition * **Welding:** Requires specialized techniques * **Heat Treatment:** Precise control of aging parameters essential * **Surface Treatment:** Excellent for anodizing and coating --- #### **9. Special Features** **7175-T7351** offers enhanced corrosion performance: * **Corrosion Resistance:** Superior to T6 temper in aggressive environments * **Stress Relief:** Reduced machining distortion * **Property Consistency:** Reliable mechanical properties * **Aerospace Heritage:** Proven performance in demanding applications **Comparison with T6 Temper:** - Better corrosion resistance - Improved stress corrosion cracking resistance - Slightly lower strength but better overall property balance - Enhanced dimensional stability --- #### **10. Performance in Service** * **Corrosion Performance:** Excellent in aerospace environments * **Fatigue Life:** Good for structural applications * **Stress Corrosion:** Superior resistance to cracking * **Temperature Stability:** Suitable for aerospace service conditions **7175-T7351 Aluminum Alloy** represents an optimized solution for aerospace applications where the combination of good strength and superior corrosion resistance is required. The T7351 temper provides enhanced environmental durability while maintaining adequate mechanical properties, making this alloy particularly valuable for aircraft structures exposed to corrosive environments or requiring stable dimensions during machining operations.

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 2192 gallon liquid totes Special package is available on request.