6021 Aluminum alloy,Aluminum 6021 alloy,E FORU

### **Product Introduction: 6021 Aluminum Alloy** **6021 Aluminum Alloy** is a heat-treatable aluminum-magnesium-silicon (Al-Mg-Si) alloy specifically developed for automotive body sheet applications. It offers an excellent balance of formability, bake-hardening response, and surface quality, making it particularly suitable for automotive outer body panels where both aesthetic appearance and structural performance are important requirements. --- ### **1. International Standards** 6021 Aluminum Alloy is recognized under the following international standards: - **AA (Aluminum Association, USA):** AA 6021 - **UNS (Unified Numbering System):** UNS A96021 - **ISO (International Organization for Standardization):** AlMg0.6Si - **ASTM:** ASTM B209 (Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate) --- ### **2. Chemical Composition** The chemical composition limits (in weight percentage) are specified as follows: | Element | Content (%) | |:---------|:------------| | **Aluminum (Al)** | Balance | | **Silicon (Si)** | 0.50 - 0.9 | | **Magnesium (Mg)** | 0.40 - 0.8 | | **Manganese (Mn)** | 0.10 - 0.4 | | **Copper (Cu)** | ≤ 0.15 | | **Iron (Fe)** | ≤ 0.30 | | **Chromium (Cr)** | ≤ 0.15 | | **Zinc (Zn)** | ≤ 0.10 | | **Titanium (Ti)** | ≤ 0.08 | | **Others (each)** | ≤ 0.05 | | **Others (total)** | ≤ 0.15 | **Key Takeaway:** The optimized silicon and magnesium ratio provides good age-hardening response, while the low copper content ensures excellent corrosion resistance. The controlled manganese addition enhances strength without compromising formability. --- ### **3. Physical Properties** The typical physical properties of 6021 aluminum alloy are: | Property | Metric Value | Imperial Value | |:----------|:-------------|:---------------| | **Density** | 2.70 g/cm³ | 0.0975 lb/in³ | | **Melting Range** | 605 - 650 °C | 1121 - 1202 °F | | **Coefficient of Thermal Expansion** | 23.4 × 10⁻⁶/°C (20-100°C) | 13.0 × 10⁻⁶/°F (68-212°F) | | **Thermal Conductivity** | 170 - 190 W/m·K | 980 - 1100 BTU·in/(hr·ft²·°F) | | **Electrical Conductivity** | 46-50% IACS | 46-50% IACS | | **Modulus of Elasticity** | 69 GPa | 10,000 ksi | | **Shear Modulus** | 26 GPa | 3,770 ksi | --- ### **4. Mechanical Properties** Mechanical properties are optimized for automotive manufacturing processes: **Temper: T4** (Solution heat-treated and naturally aged) - **Tensile Strength:** 180 - 230 MPa (26 - 33 ksi) - **Yield Strength (0.2% Offset):** 80 - 130 MPa (12 - 19 ksi) - **Elongation (% in 50mm):** 22-28% - **Strain-Hardening Exponent (n-value):** 0.22 - 0.26 - **Plastic Strain Ratio (r-value):** 0.65 - 0.80 **After Automotive Paint-Bake Cycle** (185°C/365°F for 20-30 minutes): - **Yield Strength Increase:** 70 - 110 MPa (10 - 16 ksi) - **Final Yield Strength:** 150 - 240 MPa (22 - 35 ksi) - **Final Tensile Strength:** 220 - 300 MPa (32 - 44 ksi) --- ### **5. Product Applications** 6021 Aluminum Alloy is primarily used in automotive body construction: - **Automotive Outer Body Panels:** - Door outer panels - Hood outer panels - Fender panels - Quarter panels - Roof panels - **Automotive Applications:** - Body side panels - Trunk lids and deck lids - Various exterior body components - Non-structural reinforcement parts - **Specific Use Cases:** - Applications requiring good surface quality - Components with moderate strength requirements - Parts where formability and corrosion resistance are important - Automotive exterior panels requiring paint finish --- ### **6. Key Characteristics & Advantages** - **Good Formability:** Offers excellent deep-drawing and stretch-forming capabilities, allowing for manufacturing of complex automotive panels with reasonable risk of splitting. - **Adequate Bake-Hardening Response:** Provides sufficient strength increase during automotive paint-bake cycles to meet dent resistance requirements for outer body panels. - **Excellent Surface Quality:** Very good surface characteristics with minimal roping or streaking, suitable for Class A automotive body panels. - **Superior Corrosion Resistance:** The low copper content ensures excellent resistance to atmospheric corrosion, making it ideal for automotive exterior applications. - **Good Hemming Performance:** Reliable edge-hemming characteristics suitable for closure panel assemblies. - **Consistent Performance:** Predictable behavior in automotive manufacturing environments with reliable aging characteristics. - **Weight Reduction:** Enables significant mass reduction while maintaining required performance characteristics. --- ### **7. Processing Characteristics** **Heat Treatment Parameters:** - Solution Heat Treatment: 530-550°C (985-1020°F) - Quenching: Controlled cooling to room temperature - Natural Aging: Properties stabilize within 24-72 hours - Paint-Bake Response: Effective at standard automotive curing temperatures (165-190°C) **Forming Characteristics:** - Good deep-drawing capability with drawing ratios up to 2.3 - Moderate springback characteristics - Suitable for most automotive stamping operations - Compatible with standard automotive forming lubricants **Surface Treatment:** - Excellent paint adhesion characteristics - Suitable for automotive pre-treatment processes - Good performance with E-coat systems - Maintains surface quality through painting process --- ### **8. Comparative Analysis** **vs. 6016 Alloy:** - Similar formability characteristics - Comparable corrosion resistance - Slightly different chemical optimization - Similar automotive applications **vs. 6022 Alloy:** - Better corrosion resistance - Superior surface quality - More consistent forming behavior - Similar strength levels **vs. 6111 Alloy:** - Better formability - Superior corrosion resistance - Lower strength but more consistent in production - Better surface quality --- ### **9. Automotive Manufacturing** **Production Efficiency:** - Good compatibility with automated production lines - Reasonable scrap rates in controlled processes - Acceptable tooling wear characteristics - Suitable for high-volume manufacturing **Quality Performance:** - Meets automotive OEM requirements for body panels - Consistent mechanical properties - Predictable aging behavior - Reliable in standard automotive production environments --- ### **10. Economic and Performance Benefits** **Cost Effectiveness:** - Competitive material pricing - Good balance of performance and cost - Suitable for various vehicle programs - Efficient material utilization **Performance Advantages:** - Excellent corrosion resistance for automotive applications - Good balance between formability and strength - Reliable performance in service conditions - Maintains dimensional stability --- ### **Summary** **6021 Aluminum Alloy** represents a well-balanced automotive body sheet material that delivers reliable performance for automotive body panel applications. It offers a good combination of formability, corrosion resistance, surface quality, and bake-hardening response at a competitive cost point. Its consistent performance and good manufacturing characteristics make it a practical choice for automotive manufacturers seeking to achieve weight reduction targets while maintaining cost efficiency and aesthetic quality in exterior body panels. The alloy is particularly suited for applications where good formability, excellent corrosion resistance, and good surface quality are key requirements, making it a valuable option in the automotive lightweighting material portfolio for both conventional and electric vehicles.

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 1969 gallon liquid totes Special package is available on request.