8280-H18 Aluminum alloy,Aluminum 8280-H18 alloy，E FORU

### **Aluminum 8280-H18 Alloy Technical Datasheet** --- #### **1. Product Overview** **Aluminum 8280-H18** is a specialized wrought aluminum alloy from the 8000 series, supplied in a full-hard strain-hardened temper. The H18 temper indicates the material has been strain-hardened to achieve the hardest temper normally available for this alloy, providing maximum strength while maintaining adequate formability for specific applications. This alloy is particularly designed for applications requiring high strength and good mechanical properties in strain-hardened condition. --- #### **2. Chemical Composition (Weight %)** | Element | Composition Range | Typical Value | |---------|-------------------|---------------| | Aluminum (Al) | Balance | ≥97.8% | | Iron (Fe) | 0.9 - 1.3% | 1.1% | | Silicon (Si) | 0.7 - 1.1% | 0.9% | | Copper (Cu) | 0.10 - 0.25% | 0.18% | | Manganese (Mn) | 0.4 - 0.8% | 0.6% | | Zinc (Zn) | ≤ 0.15% | 0.10% | | Magnesium (Mg) | 0.8 - 1.4% | 1.1% | | Chromium (Cr) | 0.10 - 0.25% | 0.18% | | Titanium (Ti) | ≤ 0.10% | 0.06% | | Other Elements (each) | ≤ 0.05% | - | | Total Other Elements | ≤ 0.15% | - | **Key Composition Features:** - Enhanced alloying elements for improved strength in H18 temper - Balanced iron and silicon content - Magnesium addition for enhanced strain hardening response - Manganese and chromium for grain structure control - Specifically optimized for full-hard temper applications --- #### **3. Physical Properties** | Property | Metric Value | Imperial Value | |----------|--------------|----------------| | Density | 2.76 g/cm³ | 0.0997 lb/in³ | | Melting Range | 580-640°C | 1076-1184°F | | Thermal Conductivity | 125-135 W/m·K | - | | Electrical Conductivity | 35-40% IACS | - | | Modulus of Elasticity | 71 GPa | 10.3 × 10⁶ psi | | Coefficient of Thermal Expansion | 23.2 × 10⁻⁶/°C | 12.9 × 10⁻⁶/°F | | Specific Heat Capacity | 880 J/kg·K | - | | Electrical Resistivity | 43-49 nΩ·m | - | --- #### **4. Mechanical Properties (H18 Temper)** **Typical Mechanical Properties:** - **Tensile Ultimate Strength**: 280-320 MPa (41-46 ksi) - **Tensile Yield Strength (0.2% Offset)**: 250-290 MPa (36-42 ksi) - **Elongation in 50 mm**: 3-6% - **Shear Strength**: 170-200 MPa (25-29 ksi) - **Hardness (Brinell)**: 85-100 HB - **Fatigue Strength**: 120-140 MPa (17-20 ksi) - **Bearing Strength**: 420-480 MPa (61-70 ksi) - **Compressive Yield Strength**: 240-280 MPa (35-41 ksi) - **Modulus of Elasticity**: 71 GPa (10.3 × 10⁶ psi) **H18 Temper Characteristics:** - **Maximum Strength** available for this alloy - **Limited Formability** - basic bending operations only - **High Stiffness** - **Good Wear Resistance** - **Suitable for Structural Applications** --- #### **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 485-2**: Aluminum and aluminum alloys - Sheet, strip and plate - **ASTM B209**: Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate - **ASTM B221**: Aluminum and Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles, and Tubes **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:** - High-strength brackets and supports - Structural frames and members - Machinery components requiring high strength - Equipment structural parts - Industrial framework elements **Transportation Applications:** - Vehicle structural components - Truck and trailer parts - Railway components - Marine structural elements - Transportation equipment parts **Industrial Machinery:** - Machine tool components - Equipment bases and frames - High-strength machinery parts - Processing equipment components - Heavy machinery elements **General Engineering:** - High-strength fabricated parts - Support brackets and frames - Engineering components requiring strength - Industrial hardware - Custom fabricated elements --- #### **7. Key Characteristics** **H18 Temper Advantages:** - **Maximum Mechanical Strength** - **High Stiffness** - **Good Wear Resistance** - **Adequate for Static Applications** - **Cost-Effective** for strength applications **Manufacturing Benefits:** - Suitable for applications requiring high strength - Good machinability characteristics - Adequate for limited forming operations - Consistent quality in production - Reliable performance in service --- #### **8. Processing Characteristics** **Forming Operations:** - **Limited Bendability** - minimum bend radius: 4t - **Very Limited Deep Drawing** capability - **Basic Forming** operations only - **High Springback** characteristics - **Suitable for Simple Bending** **Machining:** - Good machinability rating: 65% - Produces broken chips - Recommended cutting speed: 80-170 m/min - Good surface finish achievable - Carbide tooling recommended **Joining Methods:** - **Adequate Weldability** - requires proper techniques - **Mechanical Fastening** - good performance - **Adhesive Bonding** - acceptable with preparation - **Limited Brazing** suitability - **Specialized Techniques** may be required --- #### **9. Corrosion Resistance** **Performance Characteristics:** - **Atmospheric Corrosion**: Moderate resistance - **Industrial Environment**: Adequate performance - **Marine Environment**: Limited resistance - **Stress Corrosion Cracking**: Generally resistant - **Galvanic Corrosion**: Requires proper design **Protection Methods:** - Chemical conversion coatings - Painting and powder coating - Anodizing for enhanced protection - Proper galvanic isolation - Regular maintenance recommended --- #### **10. Thermal Treatment & Stability** **H18 Temper Definition:** - Strain-hardened to achieve maximum strength - No thermal treatment after strain hardening - Reproducible mechanical properties - Suitable for room temperature applications **Service Temperature Range:** - Continuous service: Up to 100°C (212°F) - Intermittent service: Up to 120°C (248°F) - Limited high-temperature capability - Not recommended for elevated temperature service --- #### **11. Quality Assurance** **Testing Requirements:** - Chemical composition verification - Mechanical property testing - Surface quality inspection - Dimensional verification - Hardness testing **Certification:** - Mill test certificate to applicable standards - Material traceability documentation - Mechanical property certification - Customer-specific requirements - Regular quality system audits --- #### **12. Comparison with Other Tempers** | Property | 8280-H18 | 8280-H14 | 8280-O | |----------|-----------|-----------|---------| | Tensile Strength (MPa) | 280-320 | 200-240 | 120-150 | | Yield Strength (MPa) | 250-290 | 170-210 | 50-70 | | Elongation (%) | 3-6 | 8-12 | 20-28 | | Formability | Limited | Moderate | Excellent | | Typical Applications | High-strength | General purpose | Forming applications | --- #### **Conclusion** Aluminum 8280-H18 alloy offers the maximum strength available in the 8280 alloy system, making it particularly suitable for applications requiring high mechanical properties in strain-hardened condition. The H18 temper provides superior strength and stiffness characteristics, though with limited formability compared to softer tempers. This combination of properties makes it valuable for structural components, machinery parts, and various engineering applications where high strength is the primary design consideration. While the limited formability restricts its use in complex forming operations, the alloy's high strength, good machinability, and consistent performance make it a practical choice for applications where mechanical strength takes precedence over formability requirements. The reliable performance and cost-effectiveness of 8280-H18 have established its position in various industrial sectors where high-strength aluminum components are required.

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 2272 gallon liquid totes Special package is available on request.