7072-H12 Aluminum alloy,Aluminum 7072-H12 alloy，E FORU

### **7072-H12 Aluminum Alloy: Cladding and Finstock Alloy** **7072 Aluminum Alloy** is a non-heat-treatable aluminum-zinc alloy primarily used as a cladding material for other aluminum alloys and for finstock applications. The H12 temper indicates a strain-hardened state to a quarter-hard temper, providing a balance of strength and formability suitable for various manufacturing processes. --- #### **1. Chemical Composition** | Element | Content (%) (Typical) | Role in the Alloy | | :--- | :--- | :--- | | **Zinc (Zn)** | 0.8 - 1.3 | Provides galvanic protection and lowers electrochemical potential | | **Iron (Fe)** | 0.6 - 1.0 | Increases strength and improves finstock performance | | **Silicon (Si)** | ≤ 0.10 | Impurity element | | **Copper (Cu)** | ≤ 0.10 | Impurity element | | **Manganese (Mn)** | ≤ 0.10 | Impurity element | | **Magnesium (Mg)** | ≤ 0.10 | Impurity element | | **Chromium (Cr)** | ≤ 0.04 | Impurity element | | **Titanium (Ti)** | ≤ 0.05 | Impurity element | | **Other Elements** | ≤ 0.05 each; ≤ 0.15 total | - | | **Aluminum (Al)** | Balance | Base metal | --- #### **2. Understanding the H12 Temper** The H12 temper designation indicates: - **H1**: Strain-hardened only - **2**: Quarter-hard temper, providing a specific level of strength and hardness **Key Characteristics:** - Moderate strength achieved through controlled cold working - Good balance between strength and formability - Suitable for further forming operations - Consistent mechanical properties --- #### **3. Physical Properties** | Property | Value / Description | | :--- | :--- | | **Density** | 2.72 g/cm³ (0.098 lb/in³) | | **Melting Range** | 640°C - 655°C (1184°F - 1211°F) | | **Electrical Conductivity** | 48-52% IACS | | **Thermal Conductivity** | 180-200 W/m·K | | **Coefficient of Thermal Expansion** | 23.6 × 10⁻⁶/°C (20-100°C) | | **Modulus of Elasticity** | 69 GPa (10.0 × 10⁶ psi) | --- #### **4. Mechanical Properties (Typical)** | Property | Typical Value | | :--- | :--- | | **Tensile Ultimate Strength** | 140 - 180 MPa (20 - 26 ksi) | | **Tensile Yield Strength (0.2% Offset)** | 110 - 150 MPa (16 - 22 ksi) | | **Elongation** | 10-18% | | **Shear Strength** | 85 - 115 MPa (12 - 17 ksi) | | **Fatigue Strength** | 55 - 75 MPa (8 - 11 ksi) | | **Brinell Hardness** | 35 - 50 HB | --- #### **5. Product Applications** **7072-H12** is primarily used in: * **Cladding Applications:** * Protective cladding for aircraft alloys * Architectural panel cladding * Marine component cladding * Corrosion protection layers * **Heat Exchanger Components:** * Fins for air conditioning systems * Radiator fins * Heat exchanger tubes * HVAC system components * **Electrical Applications:** * Heat sink components * Electrical conductor cladding * Electronic packaging * **Other Applications:** * Packaging materials * Decorative trim * Building products * Laminated products --- #### **6. International Standards** | Standard Body | Designation | Specification | | :--- | :--- | :--- | | **Aluminum Association** | 7072-H12 | AA Teal Sheets | | **ASTM International** | 7072-H12 | ASTM B209 / B479 | | **Aerospace (AMS)** | 7072 | AMS 4007 | | **European Norm** | EN AW-7072 H12 | EN 485-2 | | **Unified Numbering System** | A97072 | UNS Registry | --- #### **7. Key Characteristics** **Advantages:** - **Excellent sacrificial corrosion protection** when clad to core alloys - High thermal conductivity - Good electrical conductivity - Excellent formability and bendability - Good surface finish characteristics - Consistent mechanical properties - Suitable for further forming operations **Limitations:** - Moderate strength compared to heat-treatable alloys - Not suitable for primary structural applications - Limited high-temperature performance - Requires proper handling to maintain surface quality --- #### **8. Manufacturing Considerations** * **Forming:** Excellent formability in H12 temper * **Joining:** Good weldability and brazeability * **Machining:** Fair machinability - requires sharp tools * **Surface Treatment:** Excellent for anodizing and coating * **Heat Treatment:** Non-heat-treatable - properties achieved through cold work only --- #### **9. Special Features** **7072-H12** offers unique functional characteristics: * **Galvanic Protection:** When used as cladding, it sacrificially protects the core alloy from corrosion due to its electrochemical potential * **Thermal Performance:** Excellent heat transfer characteristics ideal for finstock applications * **Manufacturing Versatility:** Can be roll-bonded to other aluminum alloys * **Surface Quality:** Provides excellent surface finish for decorative applications * **Formability:** The H12 temper offers good formability for manufacturing complex shapes The alloy's primary value lies in its electrochemical properties and thermal performance. The H12 temper provides an optimal balance for manufacturing processes, offering sufficient strength for handling while maintaining good formability for subsequent fabrication operations. **7072-H12 Aluminum Alloy** serves critical functional roles in multi-layer aluminum products and heat transfer applications, where its unique combination of electrochemical, thermal, and mechanical properties make it an essential material in specific industrial applications requiring corrosion protection and efficient heat transfer.

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 2163 gallon liquid totes Special package is available on request.