7175-T74 Aluminum alloy,Aluminum 7175-T74 alloy，E FORU

### **7175-T74 Aluminum Alloy: High-Strength Corrosion Resistant Alloy** **7175-T74 Aluminum Alloy** is a high-strength aluminum-zinc-magnesium-copper alloy that has been solution heat-treated and artificially over-aged to provide an excellent combination of strength and corrosion resistance. This temper is specifically designed to offer superior resistance to stress corrosion cracking (SCC) while maintaining good mechanical properties. --- #### **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 T74 Temper** The T74 temper designation indicates: - **T7**: Solution heat-treated and artificially over-aged - **4**: Specific over-aging treatment to achieve optimal corrosion resistance **Key Characteristics:** - Enhanced resistance to stress corrosion cracking - Good exfoliation corrosion resistance - Balanced combination of strength and toughness - Improved dimensional stability --- #### **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** | 42-46% IACS | | **Thermal Conductivity** | 145-165 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** | 450 - 490 MPa (65 - 71 ksi) | | **Tensile Yield Strength (0.2% Offset)** | 380 - 420 MPa (55 - 61 ksi) | | **Elongation** | 12-16% | | **Compression Yield Strength** | 370 - 410 MPa (54 - 59 ksi) | | **Shear Strength** | 250 - 280 MPa (36 - 41 ksi) | | **Fatigue Strength** | 130 - 160 MPa (19 - 23 ksi) | | **Brinell Hardness** | 110 - 125 HB | --- #### **5. Product Applications** **7175-T74** is used in applications requiring both strength and corrosion resistance: * **Aerospace Structures:** * Wing components * Fuselage frames * Bulkheads * Structural brackets * Support structures * **Marine Applications:** * Marine aircraft components * Ship and boat structures * Offshore platform components * **Military Applications:** * Military aircraft components * Naval aircraft structures * Defense system components * **Industrial Applications:** * High-strength components in corrosive environments * Machinery parts requiring corrosion resistance --- #### **6. International Standards** | Standard Body | Designation | Specification | | :--- | :--- | :--- | | **Aluminum Association** | 7175-T74 | AA Teal Sheets | | **ASTM International** | 7175-T74 | ASTM B209 | | **Aerospace (AMS)** | 7175-T74 | AMS 4103 | | **European Norm** | EN AW-7175 T74 | EN 485-2 | | **Unified Numbering System** | A97175 | UNS Registry | --- #### **7. Key Characteristics** **Advantages:** * **Excellent stress corrosion cracking resistance** * **Superior exfoliation corrosion resistance** * **Good strength-to-weight ratio** * **Excellent fatigue performance** * **Good fracture toughness** * **Enhanced dimensional stability** * **Reliable long-term performance** **Limitations:** * Lower strength than T6 temper * Higher cost due to additional heat treatment * Requires controlled manufacturing processes * Limited formability in aged condition --- #### **8. Manufacturing Considerations** * **Machining:** Good machinability with reduced risk of stress corrosion * **Forming:** Best formed in annealed condition before final heat treatment * **Welding:** Requires specialized techniques * **Heat Treatment:** Precise control of aging parameters essential * **Surface Treatment:** Excellent for anodizing and coating --- #### **9. Special Features** **7175-T74** offers enhanced corrosion performance: * **Corrosion Resistance:** Superior performance in aggressive environments * **Property Balance:** Optimal combination of strength and corrosion resistance * **Reliability:** Proven performance in demanding applications * **Versatility:** Suitable for various product forms **Comparison with T6 Temper:** - Significantly better stress corrosion cracking resistance - Improved exfoliation corrosion resistance - Slightly lower strength but better overall property balance - Enhanced long-term reliability --- #### **10. Performance in Service** * **Corrosion Performance:** Excellent in marine and industrial environments * **Fatigue Life:** Good for structural applications * **Stress Corrosion:** Superior resistance to cracking * **Temperature Stability:** Maintains properties in service conditions **7175-T74 Aluminum Alloy** represents an optimized solution for applications where corrosion resistance is as important as mechanical strength. The T74 temper provides exceptional resistance to stress corrosion cracking while maintaining adequate strength levels, making this alloy particularly valuable for aerospace and marine applications where components are exposed to corrosive environments. The alloy's proven track record in demanding applications demonstrates its reliability and performance capabilities.

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 2194 gallon liquid totes Special package is available on request.