Magnesium EQ21-T6,UNS M16330,E FOUR

### **Technical Datasheet: Magnesium Alloy EQ21-T6, UNS M16330** --- #### **1. Material Overview** EQ21-T6 is a high-performance magnesium alloy containing rare earth elements and silver, supplied in the solution heat-treated and artificially aged condition. This alloy offers an exceptional combination of high strength, excellent creep resistance up to 250°C, and superior corrosion resistance compared to conventional magnesium alloys. --- #### **2. Key Features** - **Excellent high-temperature strength** and creep resistance - **Superior corrosion resistance** - **Good castability** for complex components - **Outstanding mechanical properties** at elevated temperatures - **Good weldability** with proper procedures - **Excellent fatigue strength** --- #### **3. Chemical Composition (Weight %)** | Element | Composition (%) | |---------|-----------------| | **Rare Earths (RE)** | 1.8–2.5% | | **Silver (Ag)** | 1.8–2.5% | | **Zirconium (Zr)** | 0.4–1.0% | | **Zinc (Zn)** | ≤ 0.30% | | **Manganese (Mn)** | ≤ 0.15% | | **Silicon (Si)** | ≤ 0.05% | | **Copper (Cu)** | ≤ 0.05% | | **Iron (Fe)** | ≤ 0.01% | | **Nickel (Ni)** | ≤ 0.005% | | **Other Elements** | ≤ 0.30% | | **Magnesium (Mg)** | Balance | *Note: The specific combination of rare earth elements (typically with high neodymium content) and silver provides exceptional strengthening effects and thermal stability.* --- #### **4. Mechanical Properties (T6 Temper)** | Property | Room Temperature | 200°C (392°F) | 250°C (482°F) | |----------|------------------|---------------|---------------| | **Ultimate Tensile Strength** | 280–320 MPa | 220–250 MPa | 180–210 MPa | | **Tensile Yield Strength (0.2%)** | 200–240 MPa | 170–200 MPa | 140–170 MPa | | **Elongation (% in 50mm)** | 5–10% | 8–15% | 10–18% | | **Compressive Yield Strength** | 200–240 MPa | 170–200 MPa | 140–170 MPa | | **Hardness (Brinell)** | 80–95 HB | 65–75 HB | 55–65 HB | | **Shear Strength** | 160–190 MPa | 130–150 MPa | 110–130 MPa | | **Fatigue Strength** | 130–150 MPa | 100–120 MPa | 80–100 MPa | --- #### **5. Physical Properties** | Property | Value | |----------|-------| | **Density** | 1.82 g/cm³ | | **Melting Range** | 550–640°C | | **Specific Heat** | 1.02 kJ/kg·K | | **Thermal Conductivity** | 110 W/m·K | | **Coefficient of Thermal Expansion** | 26.5 μm/m·K | | **Modulus of Elasticity** | 44 GPa | --- #### **6. Heat Treatment Cycle (T6)** - **Solution Treatment:** 525°C ± 5°C for 8–12 hours - **Quenching:** Hot water (70–100°C) - **Artificial Aging:** 200°C ± 5°C for 16–24 hours - **Cooling:** Air cool - **Microstructure:** Fine-grained with uniform precipitate distribution --- #### **7. Applicable Standards** - **ASTM International:** - **ASTM B80** – Magnesium-Alloy Sand Castings - **ASTM B199** – Magnesium-Alloy Permanent Mold Castings - **Aerospace Standards:** - **AMS 4428** – Magnesium Alloy Castings - **BAC 5731** – Boeing Material Specification - **European Standards:** - **EN 1753** – Magnesium and magnesium alloys - **Unified Numbering System:** - **UNS M16330** - **Military Standards:** - **MIL-M-46062** – Magnesium Alloy Castings --- #### **8. Manufacturing Characteristics** - **Casting Methods:** Sand casting, permanent mold casting - **Pouring Temperature:** 720–780°C - **Fluidity:** Very good - **Hot Tearing Resistance:** Excellent - **Machinability:** Good (sharp tools recommended) - **Weldability:** Good (TIG welding with proper filler) --- #### **9. Applications** - **Aerospace Components:** - Jet engine compressor housings - Gearbox and transmission cases - Aircraft accessory components - Helicopter transmission parts - **Racing & High-Performance Automotive:** - Turbocharger housings - High-performance engine components - Racing transmission cases - **Defense Applications:** - Military vehicle components - Weapon system parts - Armored vehicle components - **Industrial Equipment:** - High-temperature pump components - Compressor parts - Specialized machinery components --- #### **10. Corrosion Performance & Protection** - **Salt Spray Resistance:** >1000 hours to initial corrosion - **Galvanic Corrosion:** Requires isolation from dissimilar metals - **High-Temperature Oxidation:** Excellent up to 350°C - **Recommended Coatings:** Chemical conversion, anodizing, specialized high-temp coatings --- #### **11. Design Guidelines** - **Maximum Service Temperature:** 250°C continuous, 300°C short-term - **Section Thickness:** 4–80 mm recommended - **Thermal Expansion:** Consider in design for high-temperature applications - **Stress Analysis:** Account for strength retention at elevated temperatures --- #### **12. Comparison with Similar Alloys** - **vs. WE43-T6:** Better castability, comparable high-temperature properties - **vs. QE22-T6:** Improved corrosion resistance, similar mechanical properties - **vs. Conventional Mg Alloys:** Significantly better high-temperature performance --- **Note:** EQ21-T6 represents a premium high-temperature magnesium alloy with exceptional combination of properties. Its excellent castability, combined with superior high-temperature performance and corrosion resistance, makes it suitable for demanding aerospace and racing applications. Always consult with materials engineers for specific application requirements and conduct thorough testing for critical 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 3330 gallon liquid totes Special package is available on request.