Magnesium ZK21A-F, UNS M16210;,E FOUR

### **Product Datasheet: Magnesium ZK21A-F (UNS M16210)** **High-Strength Wrought Magnesium Alloy with Zinc and Zirconium** --- #### **1. Overview** Magnesium ZK21A-F (UNS M16210) is a medium-to-high strength wrought magnesium alloy that achieves its mechanical properties through a balanced combination of zinc and zirconium. Designated in the "F" temper (as-fabricated), this alloy is typically supplied in extruded or rolled forms without subsequent heat treatment. ZK21A offers a favorable combination of strength, ductility, and corrosion resistance, making it suitable for various structural applications where weight reduction is critical. --- #### **2. Key Features & Advantages** - **Good Strength-to-Weight Ratio:** Balanced mechanical properties for structural applications - **Excellent Formability:** Can be extruded and rolled into complex shapes - **Good Weldability:** Readily welded using standard TIG methods - **Fine Grain Structure:** Zirconium addition provides effective grain refinement - **Good Corrosion Resistance:** Superior to many aluminum-containing magnesium alloys - **Cost-Effective:** Provides good performance without expensive alloying elements --- #### **3. Chemical Composition (Weight %)** | Element | Mg (Balance) | Zn | Zr | Mn (max) | Si (max) | Other (max) | |---------------|--------------|------------|------------|------------|------------|-------------| | **Content (%)** | - | 1.5-2.5 | 0.45-1.0 | 0.15 | 0.10 | 0.30 total | *Note: Zinc provides solid solution strengthening, while zirconium acts as a powerful grain refiner, enhancing both strength and ductility through Hall-Petch strengthening mechanism.* --- #### **4. Typical Physical & Mechanical Properties (F Temper - As Fabricated)** | Property | Value | Condition / Remarks | |---------------------------|------------------------------|---------------------| | **Density** | 1.78 g/cm³ (0.064 lb/in³) | | | **Melting Range** | 630-650°C (1166-1202°F) | | | **Thermal Conductivity** | 121 W/m·K | At 25°C | | **Specific Heat Capacity**| 1040 J/kg·K | At 25°C | | **Coefficient of Thermal Expansion** | 26.8 × 10⁻⁶/°C | 20-200°C | | **Ultimate Tensile Strength** | 240-280 MPa (35-41 ksi) | Extruded Bar | | **Tensile Yield Strength**| 150-190 MPa (22-28 ksi) | 0.2% offset | | **Elongation** | 10-18% | In 2 inches | | **Compressive Yield Strength** | 140-180 MPa (20-26 ksi) | | | **Shear Strength** | 130-160 MPa (19-23 ksi) | | | **Fatigue Strength** | 110-130 MPa (16-19 ksi) | 10⁷ cycles | | **Elastic Modulus** | 45 GPa (6.5×10⁶ psi) | | | **Hardness** | 55-65 HB | | --- #### **5. International Standards** ZK21A-F is specified in the following international standards: - **ASTM B107/B107M:** Specification for Magnesium-Alloy Extruded Bars, Rods, Profiles, Tubes, and Wire - **ASTM B90/B90M:** Specification for Magnesium-Alloy Sheet and Plate - **UNS M16210:** Unified Numbering System designation - **AMS 4354:** Aerospace Material Specification for Sheet and Plate - **ISO 3116:** Wrought magnesium and magnesium alloys --- #### **6. Applications** - **Aerospace Components:** - Aircraft seat frames and components - Non-structural brackets and fittings - Interior panel supports - Equipment mounting structures - **Transportation Industry:** - Automotive seat frames - Bicycle frames and components - Material handling equipment parts - Truck body components - **Industrial Equipment:** - Power tool housings - Portable instrument frames - Camera and optical equipment bodies - Electronic enclosure components - **Consumer Products:** - Luggage frames - Sports equipment - Portable furniture components - Hand tool components --- #### **7. Processing & Fabrication** - **Extrusion:** Can be extruded at 300-400°C (572-752°F) into complex profiles - **Rolling:** Suitable for hot rolling into sheet and plate products - **Forming:** Requires hot forming at 200-300°C (392-572°F) for best results - **Machining:** Excellent machinability with high cutting speeds possible - **Welding:** Good weldability using TIG methods with compatible filler rods - **Heat Treatment:** Typically used in F temper; can be stress relieved if needed - **Surface Treatment:** Responds well to chemical conversion coatings and painting --- #### **8. Special Considerations** - **Temperature Limit:** Maximum service temperature 120°C (250°F) - **Corrosion Protection:** Requires standard magnesium protection for harsh environments - **Grain Size Control:** Critical for consistent mechanical properties - **Forming Temperature:** Important to maintain proper temperature during fabrication - **Quality Control:** Standard inspection methods applicable --- **Disclaimer** This technical data is for informational purposes only. Properties may vary depending on product form, section size, and fabrication parameters. Users should conduct appropriate testing to verify suitability for specific applications and consult relevant material specifications before use. Proper safety precautions for magnesium processing must always be followed, particularly regarding fire hazards during machining and grinding operations.

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 3365 gallon liquid totes Special package is available on request.