6020-T9 Aluminum alloy,Aluminum 6020-T9 alloy,E FORU

### **Product Introduction: 6020-T9 Aluminum Alloy** **6020-T9 Aluminum Alloy** is a high-strength, heat-treatable aluminum-magnesium-silicon (Al-Mg-Si) alloy that has undergone solution heat treatment, artificial aging, and then cold working to achieve the highest strength levels in the 6020 alloy system. The T9 temper provides maximum strength and hardness through a combination of precipitation hardening and work hardening, making it suitable for applications requiring superior mechanical properties and wear resistance. --- ### **1. International Standards** 6020-T9 Aluminum Alloy is recognized under the following international standards: - **AA (Aluminum Association, USA):** AA 6020, Temper T9 - **UNS (Unified Numbering System):** UNS A96020 - **ASTM:** ASTM B211 (Standard Specification for Aluminum and Aluminum-Alloy Bar, Rod, and Wire) - **ISO (International Organization for Standardization):** AlMg1.0Si - T9 --- ### **2. Chemical Composition** The chemical composition limits (in weight percentage) are specified as follows: | Element | Content (%) | |:---------|:------------| | **Aluminum (Al)** | Balance | | **Silicon (Si)** | 0.30 - 0.7 | | **Magnesium (Mg)** | 0.50 - 1.0 | | **Manganese (Mn)** | 0.05 - 0.30 | | **Copper (Cu)** | 0.15 - 0.35 | | **Iron (Fe)** | ≤ 0.40 | | **Chromium (Cr)** | ≤ 0.15 | | **Zinc (Zn)** | ≤ 0.20 | | **Titanium (Ti)** | ≤ 0.10 | | **Lead (Pb)** | 0.05 - 0.20 | | **Bismuth (Bi)** | 0.05 - 0.20 | | **Others (each)** | ≤ 0.05 | | **Others (total)** | ≤ 0.15 | **Key Takeaway:** The combination of lead and bismuth provides excellent machinability, while the carefully balanced magnesium-silicon-copper composition enables maximum strengthening through the T9 temper process sequence. --- ### **3. Physical Properties** The typical physical properties of 6020-T9 aluminum alloy are: | Property | Metric Value | Imperial Value | |:----------|:-------------|:---------------| | **Density** | 2.71 g/cm³ | 0.0979 lb/in³ | | **Melting Range** | 595 - 650 °C | 1103 - 1202 °F | | **Coefficient of Thermal Expansion** | 23.0 × 10⁻⁶/°C (20-100°C) | 12.8 × 10⁻⁶/°F (68-212°F) | | **Thermal Conductivity** | 145 - 165 W/m·K | 840 - 955 BTU·in/(hr·ft²·°F) | | **Electrical Conductivity** | 36-40% IACS | 36-40% IACS | | **Modulus of Elasticity** | 70.5 GPa | 10,220 ksi | | **Shear Modulus** | 26.5 GPa | 3,840 ksi | | **Poisson's Ratio** | 0.33 | 0.33 | --- ### **4. Mechanical Properties (T9 Temper)** The T9 temper provides the ultimate strength combination for 6020 alloy: **Typical Mechanical Properties:** - **Tensile Strength:** 400 - 450 MPa (58 - 65 ksi) - **Yield Strength (0.2% Offset):** 360 - 410 MPa (52 - 59 ksi) - **Elongation (% in 50mm):** 5-8% - **Shear Strength:** 240 MPa (35 ksi) - **Compressive Yield Strength:** 350 MPa (51 ksi) - **Fatigue Strength:** 130 MPa (19 ksi) [Rotating Beam, 5×10⁸ cycles] - **Hardness (Brinell):** 115 - 125 HB - **Hardness (Rockwell B):** 70 - 80 HRB - **Fracture Toughness (KIC):** 23-26 MPa√m --- ### **5. Product Applications** 6020-T9 is used in specialized applications requiring maximum strength and hardness: - **High-Stress Mechanical Components:** - High-strength fasteners - Heavy-duty connectors - Load-bearing mechanical parts - High-stress structural fittings - **Wear-Resistant Applications:** - Bushing and bearing components - Wear plates and guides - Machinery wear surfaces - High-abrasion environment parts - **Precision Components:** - High-strength screw machine products - Complex machined components requiring maximum strength - Precision instrument parts - **Specialized Industrial Applications:** - Tooling components - Jig and fixture elements - Machinery frames and bases - Equipment structural members --- ### **6. Key Characteristics & Advantages** - **Maximum Strength and Hardness:** The T9 temper provides the highest possible strength and hardness values for the 6020 alloy system through combined aging and cold working. - **Superior Wear Resistance:** Enhanced surface hardness and wear characteristics due to work hardening effects. - **Excellent Machinability:** Maintains good machining characteristics despite high strength, benefiting from lead and bismuth additions for chip control. - **Good Dimensional Stability:** Cold working after aging provides excellent stability for precision applications. - **Enhanced Stiffness:** Higher modulus of elasticity compared to softer tempers. - **Improved Surface Properties:** Cold worked surface provides better resistance to indentation and abrasion. - **Maintained Corrosion Resistance:** Despite high strength, maintains adequate corrosion resistance for most industrial applications. --- ### **7. Processing Characteristics** **Heat Treatment Cycle (T9):** - Solution Heat Treatment: 525-545°C (975-1015°F) for 30-60 minutes - Quenching: Rapid water quench to room temperature - Artificial Aging: 150-170°C (300-340°F) for 8-16 hours - Cold Working: 5-10% permanent deformation after aging **Machining Performance:** - **Machinability Rating:** 75-80 (compared to 2011-T3 as 100) - Requires robust machining equipment and sharp tooling - Maintains good chip breakage characteristics - Reduced tool life compared to softer tempers - Suitable for precision machining with proper parameters **Forming Characteristics:** - Very limited formability in T9 temper - Essentially non-formable after final processing - All forming must be completed before final aging and cold working - High springback characteristics --- ### **8. Corrosion Performance** - **General Corrosion:** Adequate for most industrial environments - **Stress Corrosion Cracking:** Good resistance when properly processed - **Atmospheric Corrosion:** Suitable for protected environments - **Galvanic Corrosion:** Standard aluminum precautions apply **Protection Methods:** - Hard anodizing for maximum wear and corrosion resistance - Chemical conversion coatings - Industrial painting systems - Powder coating applications --- ### **9. Special Considerations** **Design Limitations:** - Limited to applications not requiring subsequent forming - Not suitable for welded assemblies - Stress concentration factors require careful consideration - Limited toughness compared to lower strength tempers **Manufacturing Considerations:** - All machining should be completed after T9 processing - Stress relief may be required for complex machined parts - Proper tool selection critical for successful machining - Coolant selection important for optimal tool life --- ### **10. Comparative Advantages** **vs. 6020-T8:** - Higher strength and hardness - Better wear resistance - Improved stiffness - Superior mechanical properties **vs. 2011-T8:** - Better overall corrosion resistance - Superior stress corrosion cracking resistance - More consistent mechanical properties **vs. 7075-T6:** - Better machinability - Superior stress corrosion cracking resistance - Good alternative for non-aerospace applications --- ### **Summary** **6020-T9 Aluminum Alloy** represents the ultimate strength condition for the 6020 alloy system, providing maximum mechanical properties through the unique T9 temper sequence of solution treatment, artificial aging, followed by cold working. This specialized processing route makes it ideal for applications requiring the highest strength and wear resistance while maintaining the excellent machinability characteristics inherent to the 6020 alloy system. While offering limited formability and requiring specialized manufacturing approaches, 6020-T9 provides an exceptional solution for high-stress mechanical components, wear-resistant applications, and precision parts where maximum strength-to-weight ratio and superior mechanical performance are paramount requirements.

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 1968 gallon liquid totes Special package is available on request.