2028B Aluminum alloy,Aluminum 2028B alloy,E FORU

### **Aluminum 2028B Alloy Product Introduction** **Overview** 2028B Aluminum Alloy is an advanced free-machining aluminum-copper alloy developed as an enhanced version of the 2028 series. It offers optimized machinability characteristics combined with improved mechanical properties and better production consistency. The "B" designation indicates specific modifications to the composition for enhanced performance in automatic machining applications. --- #### **1. Chemical Composition** | Element | Content (%) | |---------|-------------| | **Aluminum (Al)** | Balance | | **Copper (Cu)** | 3.3 - 4.3 | | **Silicon (Si)** | 1.0 - 1.7 | | **Iron (Fe)** | ≤ 0.5 | | **Manganese (Mn)** | 0.30 - 0.8 | | **Magnesium (Mg)** | 0.50 - 1.0 | | **Zinc (Zn)** | ≤ 0.3 | | **Lead (Pb)** | 1.0 - 1.7 | | **Bismuth (Bi)** | 0.6 - 1.0 | | **Tin (Sn)** | 0.10 - 0.25 | | **Other Elements** | ≤ 0.15 total | --- #### **2. Physical Properties** | Property | Value / Description | |----------|---------------------| | **Density** | 2.89 g/cm³ (0.104 lb/in³) | | **Melting Range** | 520°C - 645°C (968°F - 1193°F) | | **Electrical Conductivity** | 37-42% IACS | | **Thermal Conductivity** | 140-150 W/m·K | | **Coefficient of Thermal Expansion** | 23.8 × 10⁻⁶/°C (20-100°C) | | **Modulus of Elasticity** | 71.0 GPa (10,300 ksi) | | **Poisson's Ratio** | 0.33 | --- #### **3. Mechanical Properties** **Typical Mechanical Properties (T6 Temper):** | Property | Value | |----------|-------| | **Tensile Strength** | 360-410 MPa (52-59 ksi) | | **Yield Strength (0.2% Offset)** | 270-320 MPa (39-46 ksi) | | **Elongation in 2 inches** | 10-15% | | **Shear Strength** | 220-260 MPa (32-38 ksi) | | **Fatigue Strength** | 125 MPa (18 ksi) | | **Brinell Hardness** | 105-115 HB | | **Machinability Rating** | Outstanding (99% of free-cutting brass) | --- #### **4. International Standards** | Standard System | Designation | Product Form | |-----------------|-------------|--------------| | **ASTM** | ASTM B211 | Rod, Bar, Wire | | **EN** | EN AW-2028B | Extruded Products | | **UNS** | A92028 | - | | **JIS** | A2028B | Bar, Rod, Wire | --- #### **5. Product Applications** **Precision Automotive Components:** - Fuel injection nozzles and components - Transmission gear shafts - Engine valve train components - Power steering system parts - Advanced brake system components **Aerospace and Defense:** - Precision aircraft fittings - Avionics mounting components - Guidance system parts - Instrumentation mechanisms - Communication equipment parts **High-Tech Industrial Applications:** - Robotics components - CNC machine parts - Precision valve bodies - Hydraulic system components - Optical positioning systems **Electronics and Telecommunications:** - RF connector components - Waveguide parts - Precision electronic housings - Heat dissipation components - Fiber optic equipment parts --- #### **6. Key Advantages & Considerations** **Advantages:** - ✅ **Exceptional Machinability** - superior chip control - ✅ **Enhanced Mechanical Properties** - ✅ **Improved Production Consistency** - ✅ **Excellent Surface Finish** - minimal post-processing - ✅ **Superior Tool Life** - reduced manufacturing costs - ✅ **Optimized for High-Speed Machining** **Considerations:** - ⚠️ **Regulated Material Composition** - contains lead and tin - ⚠️ **Environmental Compliance Requirements** - ⚠️ **Limited High-Temperature Applications** - ⚠️ **Special Storage and Handling Needed** - ⚠️ **Restricted in Certain International Markets** --- **Heat Treatment Specifications** **Standard Tempers Available:** - O: Annealed (maximum formability) - T4: Solution heat-treated and naturally aged - T6: Solution heat-treated and artificially aged (recommended) **Optimal T6 Heat Treatment Cycle:** - Solution Treatment: 508-518°C (946-964°F) - Quenching: Controlled water quench at 60-80°C - Artificial Aging: 158-168°C (316-334°F) for 7-11 hours --- **Machining Performance** **Machinability Characteristics:** - Rating: 99% of free-cutting brass standard - Optimal Cutting Speed: 250-350 m/min - Feed Rates: High rates achievable - Surface Finish: Ra 0.4-1.2 μm typical - Chip Formation: Excellent breakability **Tooling Recommendations:** - Primary: Micro-grain carbide tools - Alternative: Coated carbide inserts - Coolant: Water-soluble oils recommended - Tool Geometry: Positive rake angles preferred --- **Quality Assurance Standards** **Production Controls:** - Tight chemical composition ranges - Consistent mechanical properties - Uniform microstructure requirements - Strict dimensional tolerances - Comprehensive traceability **Testing Requirements:** - Full chemical analysis - Mechanical property verification - Machinability performance tests - Microstructural examination - Surface quality validation --- **Environmental and Regulatory Compliance** **Compliance Information:** - EU RoHS: Not compliant - REACH: Requires registration - UL Standards: Evaluated case by case - Transportation: Classified as hazardous material - Disposal: Special procedures required **Sustainable Alternatives:** - 6028 alloy for lead-free applications - 6262 alloy for general machining - 2011B for similar performance characteristics --- **Conclusion** 2028B Aluminum Alloy represents the pinnacle of free-machining aluminum technology, offering manufacturers unparalleled machining performance combined with reliable mechanical properties. The carefully balanced composition, including strategic additions of tin and optimized lead-bismuth ratios, provides exceptional chip control and surface finish quality. While environmental regulations require careful consideration in material selection, 2028B remains the preferred choice for high-precision applications in automotive, aerospace, and advanced industrial sectors where machining efficiency and component quality are paramount. The alloy's consistent performance in high-volume production environments ensures cost-effective manufacturing of complex precision components, maintaining its position as a premium material for demanding machining 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 1556 gallon liquid totes Special package is available on request.