8081-H25 Aluminum alloy,Aluminum 8081-H25 alloy，E FORU

### **Aluminum 8081-H25 Alloy Technical Datasheet** --- #### **1. Product Overview** **Aluminum 8081-H25** is a specialized wrought aluminum alloy from the 8000 series, supplied in a strain-hardened temper that has been partially annealed to achieve a specific balance of strength and formability. The H25 temper indicates the material has been strain hardened to a degree and then partially annealed, resulting in properties between those of the H2 and H3 tempers. This alloy is designed for applications requiring good strength combined with adequate formability and stable mechanical properties. --- #### **2. Chemical Composition (Weight %)** | Element | Composition Range | Typical Value | |---------|-------------------|---------------| | Aluminum (Al) | Balance | ≥97.6% | | Iron (Fe) | 1.1 - 1.7% | 1.4% | | Silicon (Si) | 0.6 - 1.1% | 0.85% | | Copper (Cu) | 0.08 - 0.22% | 0.15% | | Manganese (Mn) | 0.5 - 0.9% | 0.7% | | Zinc (Zn) | ≤ 0.12% | 0.08% | | Magnesium (Mg) | 0.7 - 1.2% | 0.95% | | Chromium (Cr) | 0.08 - 0.22% | 0.15% | | Titanium (Ti) | ≤ 0.08% | 0.05% | | Other Elements (each) | ≤ 0.05% | - | | Total Other Elements | ≤ 0.15% | - | **Key Composition Features:** - Enhanced alloying elements for improved strength characteristics - Balanced composition for H25 temper processing - Magnesium and manganese for solid solution strengthening - Controlled iron and silicon content - Optimized for stable mechanical properties after partial annealing --- #### **3. Physical Properties** | Property | Metric Value | Imperial Value | |----------|--------------|----------------| | Density | 2.77 g/cm³ | 0.100 lb/in³ | | Melting Range | 585-645°C | 1085-1193°F | | Thermal Conductivity | 135-145 W/m·K | - | | Electrical Conductivity | 37-42% IACS | - | | Modulus of Elasticity | 71 GPa | 10.3 × 10⁶ psi | | Coefficient of Thermal Expansion | 23.3 × 10⁻⁶/°C | 12.9 × 10⁻⁶/°F | | Specific Heat Capacity | 880 J/kg·K | - | | Electrical Resistivity | 41-47 nΩ·m | - | --- #### **4. Mechanical Properties (H25 Temper)** **Typical Mechanical Properties:** - **Tensile Ultimate Strength**: 220-260 MPa (32-38 ksi) - **Tensile Yield Strength (0.2% Offset)**: 160-200 MPa (23-29 ksi) - **Elongation in 50 mm**: 12-16% - **Shear Strength**: 140-170 MPa (20-25 ksi) - **Hardness (Brinell)**: 65-80 HB - **Fatigue Strength**: 90-110 MPa (13-16 ksi) - **Bearing Strength**: 330-390 MPa (48-57 ksi) - **Compressive Yield Strength**: 150-190 MPa (22-28 ksi) **H25 Temper Specific Characteristics:** - **Improved Formability** compared to H2 tempers - **Reduced Residual Stresses** - **Better Stability** during manufacturing processes - **Adequate Strength** for many applications - **Consistent Mechanical Properties** --- #### **5. International Standards** **Primary Specifications:** - **EN 573-3**: Aluminum and aluminum alloys - Chemical composition - **ISO 209**: Wrought aluminum and aluminum alloys - **GB/T 3190**: Wrought aluminum and aluminum alloy chemical composition **Product Standards:** - **EN 755-2**: Aluminum and aluminum alloys - Extruded rod/bar, tube and profiles - **ASTM B221**: Standard Specification for Aluminum and Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles, and Tubes - **ASTM B211**: Standard Specification for Aluminum and Aluminum-Alloy Bar, Rod, and Wire **Temper Standards:** - **EN 515**: Aluminum and aluminum alloys - Temper designations - **ASTM B296**: Standard Practice for Temper Designations - **ISO 2107**: Aluminum temper designations --- #### **6. Product Applications** **Structural Components:** - Medium-strength structural frames - Support brackets and mounting plates - Equipment structural parts - Building components - Industrial framework elements **Transportation Applications:** - Vehicle structural members - Truck and trailer components - Railway equipment parts - Marine structural elements - Transportation system components **Industrial Equipment:** - Machinery components - Equipment frames and bases - Material handling systems - Processing equipment parts - Industrial machinery elements **General Engineering:** - Fabricated metal products - Engineering components - Hardware applications - Custom fabricated parts - General manufacturing applications --- #### **7. Key Characteristics** **H25 Temper Advantages:** - **Good Balance** of strength and formability - **Reduced Springback** compared to H2 tempers - **Improved Stability** during fabrication - **Adequate Weldability** - **Good Machinability** - **Consistent Performance** **Manufacturing Benefits:** - Suitable for moderate forming operations - Good welding characteristics - Adequate machinability - Stable during manufacturing processes - Reliable in service conditions --- #### **8. Processing Characteristics** **Forming Operations:** - **Good Bendability** - minimum bend radius: 2t - **Moderate Deep Drawing** capability - **Adequate Roll Forming** characteristics - **Suitable for Press Brake Forming** - **Improved Formability** over H2 tempers **Machining:** - Good machinability rating: 55% - Produces broken to semi-continuous chips - Recommended cutting speed: 90-190 m/min - Good surface finish achievable - Carbide or high-speed steel tooling suitable **Joining Methods:** - **Good Weldability** - MIG and TIG methods suitable - **Adequate Brazing** characteristics - **Mechanical Fastening** - good performance - **Adhesive Bonding** - acceptable with preparation - **Riveting** - suitable for structural connections --- #### **9. Corrosion Resistance** **Performance Characteristics:** - **Atmospheric Corrosion**: Good resistance - **Industrial Environment**: Adequate performance - **Marine Environment**: Moderate resistance - **Stress Corrosion Cracking**: Generally resistant - **Galvanic Corrosion**: Requires proper design considerations **Protection Methods:** - Chemical conversion coatings - Painting and powder coating systems - Anodizing for enhanced protection - Proper galvanic isolation when needed - Regular maintenance recommended for harsh environments --- #### **10. Thermal Treatment & Stability** **H25 Temper Process:** - Initial strain hardening to specific level - Partial annealing to achieve desired properties - Stabilization of mechanical properties - Final quality verification and testing **Service Temperature Range:** - Continuous service: Up to 120°C (250°F) - Intermittent service: Up to 150°C (300°F) - Good thermal stability for most applications - Maintains properties within service range --- #### **11. Quality Assurance** **Testing Requirements:** - Chemical composition verification - Mechanical property testing - Surface quality inspection - Dimensional accuracy verification - Non-destructive testing when specified **Certification:** - Mill test certificate to applicable standards - Material traceability documentation - Mechanical property certification - Customer-specific quality requirements - Regular quality system audits --- #### **12. Comparison with Similar Tempers** | Property | 8081-H25 | 8081-H22 | 8081-H28 | |----------|-----------|-----------|-----------| | Tensile Strength (MPa) | 220-260 | 200-240 | 260-300 | | Yield Strength (MPa) | 160-200 | 140-180 | 200-240 | | Elongation (%) | 12-16 | 14-18 | 8-12 | | Formability | Good | Very Good | Moderate | | Typical Applications | General structural | Forming applications | High-strength applications | --- #### **Conclusion** Aluminum 8081-H25 alloy offers an optimal balance of mechanical strength and manufacturing versatility for various industrial applications. The H25 temper provides improved stability and formability compared to fully strain-hardened tempers, while maintaining adequate strength for structural components and general engineering applications. This combination of properties makes it particularly valuable for applications requiring both reasonable strength and good fabrication characteristics. The alloy's consistent performance, reliable processing behavior, and adequate corrosion resistance ensure predictable results in manufacturing operations and reliable service in various industrial environments. The 8081-H25 alloy represents a practical solution for engineers and manufacturers seeking a material that offers a balanced combination of performance characteristics for medium-strength structural and general engineering applications.

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 2255 gallon liquid totes Special package is available on request.