6181A Aluminum alloy,Aluminum 6181A alloy,E FORU

### **Aluminum 6181A Alloy: Product Introduction** **Overview** Aluminum 6181A is an enhanced variant of the 6181 aluminum alloy, specifically optimized for **automotive body sheet applications**. This improved version offers **superior mechanical properties** and **enhanced formability** while maintaining excellent surface quality. The "A" designation indicates refined chemical composition and processing controls to meet the demanding requirements of modern automotive manufacturing. --- #### **1. Chemical Composition (Weight %)** | Element | Minimum (%) | Maximum (%) | Notes | |---------|-------------|-------------|-------| | Silicon (Si) | 0.70 | 1.10 | Tightly controlled for optimal Mg₂Si formation | | Iron (Fe) | - | 0.30 | Reduced maximum for improved formability | | Copper (Cu) | 0.08 | 0.18 | Optimized for paint bake response | | Manganese (Mn) | 0.05 | 0.15 | Controlled for better surface quality | | Magnesium (Mg) | 0.50 | 0.90 | Balanced for strength and formability | | Chromium (Cr) | - | 0.08 | Limited for improved corrosion resistance | | Zinc (Zn) | - | 0.15 | Reduced for better surface appearance | | Titanium (Ti) | 0.02 | 0.08 | Added for grain refinement | | Other (Each) | - | 0.03 | Tighter impurity control | | Other (Total) | - | 0.10 | Enhanced purity requirements | | **Aluminum (Al)** | **Balance** | | | --- #### **2. Physical Properties** | Property | Metric Value | Imperial Value | |----------|--------------|----------------| | **Density** | 2.70 g/cm³ | 0.0975 lb/in³ | | **Melting Range** | 570-640 °C | 1058-1184 °F | | **Electrical Conductivity** | 46-50% IACS | 46-50% IACS | | **Thermal Conductivity** | 175-190 W/m·K | 1015-1100 BTU·in/(hr·ft²·°F) | | **Coefficient of Thermal Expansion** | 23.6 × 10⁻⁶/°C | 13.1 × 10⁻⁶/°F | | **Modulus of Elasticity** | 69.0 GPa | 10,007 ksi | --- #### **3. Mechanical Properties** **Typical Mechanical Properties by Temper:** | Property | T4 Temper | T4P Temper | After Paint Bake (20min @ 185°C) | |----------|-----------|------------|------------------| | **Tensile Strength** | 240-280 MPa | 210-250 MPa | 300-340 MPa | | **Yield Strength (0.2% Offset)** | 130-160 MPa | 110-140 MPa | 250-290 MPa | | **Elongation (in 50mm)** | 24-28% | 26-30% | 14-18% | | **Hardness (Brinell)** | 72-82 HB | 62-72 HB | 92-102 HB | | **n-value (Strain Hardening Exponent)** | 0.23-0.27 | 0.25-0.29 | - | | **r-value (Plastic Strain Ratio)** | 0.65-0.75 | 0.70-0.80 | - | --- #### **4. International Standards** * **European Standards (EN):** * EN 573-3: Chemical composition (Designation: EN AW-6181A) * EN 485-2: Mechanical properties for sheet and plate * EN 1396: Aluminum and aluminum alloys - Strip for general applications * **ASTM Standards:** * ASTM B209: Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate * **ISO Standards:** * ISO 6361-2: Wrought aluminum and aluminum alloy sheets, strips and plates * ISO 7771: Aluminum and aluminum alloys - Sheet, strip and plate * **Automotive Standards:** * VDA 239-100: Material standard for automotive sheet * Various automotive OEM specifications (VW, BMW, Mercedes-Benz) --- #### **5. Product Applications** **Automotive Body Panels:** - Class-A outer body panels (doors, hoods, fenders) - Roof panels and quarter panels - Deck lids and liftgates - Body side outer panels **Automotive Structural Components:** - Body-in-white structural parts - Crash management components - Chassis reinforcements - Suspension components **Transportation Industry:** - Commercial vehicle body panels - Bus exterior components - Railway vehicle body panels - Recreational vehicle components **Special Applications:** - High-quality architectural panels - Premium consumer products - Electronic enclosures - Specialized industrial components --- #### **6. Key Characteristics & Advantages** * **Enhanced Bake Hardening Response:** Improved strength increase after paint baking (70-120 MPa yield strength improvement) * **Superior Formability:** Excellent deep drawing and stretch forming capabilities * **Exceptional Surface Quality:** Superior surface finish for Class-A applications * **Improved Hemming Performance:** Excellent edge hemming characteristics * **Good Corrosion Resistance:** Enhanced performance in automotive environments * **Excellent Weldability:** Compatible with all automotive welding processes * **Consistent Performance:** Better batch-to-batch consistency --- #### **7. Heat Treatment Characteristics** **Solution Heat Treatment:** - Temperature: 540-550°C (1004-1022°F) - Time: Precisely controlled heating and holding times - Quenching: Controlled rapid cooling **Paint Bake Cycle Response:** - Standard bake cycle: 175-190°C (347-374°F) for 20-30 minutes - Optimized aging response for automotive paint shops - Consistent property development --- #### **8. Processing and Fabrication** **Stamping Characteristics:** - Excellent deep drawing capability - Superior stretch formability - Predictable springback characteristics - Suitable for complex geometries **Surface Treatment Compatibility:** - Excellent phosphating response - Superior electrocoating performance - Outstanding paint adhesion - Compatible with all automotive coating systems **Joining Methods:** - Excellent resistance spot welding performance - MIG and TIG welding applicable - Advanced joining methods compatible - Adhesive bonding suitable **Hemming Performance:** - Superior for tight radius hems - Excellent for flat hems - Minimal edge cracking - Consistent performance in production --- #### **9. Quality Assurance** **Enhanced Testing Requirements:** - Comprehensive mechanical property testing - Advanced formability testing (n-value, r-value) - Surface quality inspection to automotive standards - Bake hardening response verification - Corrosion testing per automotive specifications **Automotive Certification:** - Meets stringent automotive OEM specifications - Enhanced surface quality standards compliance - Dimensional stability requirements - Superior batch-to-batch consistency --- **Technical Note:** Aluminum 6181A represents a significant improvement over standard 6181 alloy, with optimized chemical composition and enhanced processing controls to meet the demanding requirements of modern automotive manufacturing. The tighter compositional ranges and improved impurity control ensure consistent performance in high-volume production environments. This enhanced version provides better formability, improved surface quality, and more consistent paint bake response, making it particularly valuable for automotive applications where reliability and consistency are critical. The alloy's balanced properties make it suitable for both structural components and Class-A body panels, offering automotive manufacturers an optimal combination of performance, manufacturability, and cost-effectiveness.

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 2054 gallon liquid totes Special package is available on request.