Magnesium AS21-F, Die Cast,E FOUR

**Product Data Sheet: Magnesium AS21-F, Die Cast** --- **1. Overview** Magnesium AS21-F is a high-temperature magnesium-aluminum-silicon die casting alloy specifically engineered for applications requiring superior creep resistance at elevated temperatures. The alloy's composition promotes the formation of stable magnesium silicide (Mg₂Si) precipitates that provide excellent thermal stability and long-term mechanical integrity under sustained load at high temperatures. --- **2. International Standards** - **ASTM**: B93 (Castings) - **EN**: 1753 MC21310 - **ISO**: 16220 - **SAE**: J465 - **DIN**: MgAl2Si - **JIS**: H 5303 - **GB/T**: 19078 - **UNS**: M12310 --- **3. Chemical Composition (wt%)** | Element | Minimum | Maximum | |------------------|--------------|--------------| | Magnesium (Mg) | Balance | Balance | | Aluminum (Al) | 1.9 | 2.5 | | Silicon (Si) | 0.7 | 1.2 | | Manganese (Mn) | 0.15 | 0.35 | | Zinc (Zn) | – | 0.10 | | Copper (Cu) | – | 0.05 | | Iron (Fe) | – | 0.004 | | Nickel (Ni) | – | 0.005 | | Other Impurities | – | 0.30 | --- **4. Physical Properties** | Property | Value | |-------------------------------|---------------------------------| | Density | 1.76 g/cm³ (0.063 lb/in³) | | Melting Range | 580-630°C (1076-1166°F) | | Thermal Conductivity | 84 W/m·K (at 25°C) | | Electrical Resistivity | 10.5 nΩ·m | | Coefficient of Thermal Expansion | 25.8 μm/m·°C (20-100°C) | | Specific Heat Capacity | 1060 J/kg·K | | Solidification Shrinkage | 3.8% | --- **5. Mechanical Properties (As-Die Cast)** | Property | Value (20°C) | Value (150°C) | |-------------------------------|---------------------|---------------------| | Tensile Strength | 175-195 MPa | 125-145 MPa | | Yield Strength (0.2% Offset) | 95-115 MPa | 75-90 MPa | | Elongation (% in 50 mm) | 12-18% | 18-28% | | Hardness (Brinell) | 52-58 HB | 38-43 HB | | Fatigue Strength | 78-88 MPa | 55-65 MPa | | Modulus of Elasticity | 45 GPa | 42 GPa | | Compressive Yield Strength | 95-115 MPa | 75-90 MPa | --- **6. High-Temperature Performance** - Maximum continuous service temperature: 175°C (347°F) - Excellent creep resistance up to 150°C (302°F) - 100-hour creep strength (150°C): 50 MPa - Good thermal fatigue resistance - Minimal property degradation after long-term exposure --- **7. Die Casting Characteristics** - Good fluidity and mold filling capability - Suitable for wall thicknesses: 2.0-4.0 mm - Low hot tearing tendency - Moderate die soldering resistance - Cycle time: 25-50 seconds - Surface finish: Ra 0.8-1.2 μm --- **8. Typical Die Casting Parameters** - Melt Temperature: 670-700°C (1238-1292°F) - Die Temperature: 220-280°C (428-536°F) - Injection Pressure: 45-85 MPa (6500-12300 psi) - Gate Velocity: 30-60 m/s - Intensification Pressure: 65-105 MPa (9400-15200 psi) --- **9. Applications** - **Automotive Powertrain**: Engine blocks, transmission cases, oil pans - **Automotive Components**: Intake manifolds, valve covers, engine brackets - **Aerospace**: Engine accessory housings, gearbox components - **Industrial**: Pump housings, compressor components, high-temperature machinery parts - **Electronics**: Power electronics housings, heat sink components --- **10. Corrosion Resistance** - Good resistance to atmospheric corrosion - Enhanced high-temperature oxidation resistance - Suitable for automotive under-hood environments - Compatible with: - Chromate conversion coatings - Anodizing treatments - High-temperature paint systems - Powder coating --- **11. Fabrication Notes** - **Machining**: Good machinability with sharp tools and proper cooling - **Joining**: Adhesive bonding and mechanical fastening recommended - **Welding**: TIG welding possible with proper technique - **Heat Treatment**: Typically used in as-cast condition --- **12. Key Advantages** - Superior creep resistance at elevated temperatures - Excellent thermal stability and retention of properties - Good castability for complex components - Low density with good specific strength - Excellent damping capacity - Good EMI shielding properties --- **13. Design Considerations** - Ideal for components operating at 120-175°C - Suitable for applications requiring sustained load at high temperatures - Excellent for automotive powertrain applications - Good thermal fatigue resistance for cyclic applications - Lower room temperature strength but superior high-temperature performance vs AZ/AM alloys --- **14. Quality Control** - Chemical analysis per ASTM E1097 - Mechanical testing per ASTM B557 - High-temperature testing per ASTM E21 - Creep testing per ASTM E139 - Radiographic inspection - Dye penetrant testing --- **15. Comparative Performance** | Property (at 150°C/100h) | AS21-F | AZ91D | AE44 | |-----------------------------|-------------|-------------|-------------| | Creep Strength (MPa) | 50 | 25 | 40 | | Tensile Strength (MPa) | 125-145 | 80-100 | 110-130 | | Cost Effectiveness | High | Very High | Moderate | | Castability | Good | Excellent | Good | --- *Note: Properties are typical for sections 3-5 mm thick. Actual performance may vary based on specific casting parameters, component design, and wall thickness. For critical applications, prototype testing under actual service conditions is recommended. Consult with materials engineers for application-specific guidance.*

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 3282 gallon liquid totes Special package is available on request.