Magnesium ZK21A Wrought Alloy (UNS M16210)， Mg-2.3Zn-0.65Zr，UNS M16210,E FOUR

### **Product Datasheet: Magnesium ZK21A Wrought Alloy (UNS M16210)** **Mg-2.3Zn-0.65Zr - High-Strength Wrought Magnesium Alloy** --- #### **1. Overview** Magnesium ZK21A (UNS M16210) is a medium-to-high strength wrought magnesium alloy with a nominal composition of Mg-2.3Zn-0.65Zr. This alloy combines zinc for solid solution strengthening and zirconium for grain refinement, resulting in an excellent balance of strength, ductility, and corrosion resistance. Available in various wrought forms including extruded bars, rods, sheets, and plates, ZK21A is particularly valued for its good combination of mechanical properties and manufacturing versatility in the as-fabricated (F) condition. --- #### **2. Key Features & Advantages** - **Excellent Strength-to-Weight Ratio:** Optimal balance of strength and lightness - **Superior Grain Refinement:** Zirconium provides fine, uniform grain structure - **Good Formability:** Can be extruded, rolled, and forged into complex shapes - **Enhanced Corrosion Resistance:** Better performance than many Mg-Al alloys - **Good Weldability:** Suitable for TIG and other fusion welding processes - **Excellent Machinability:** High-speed machining capability with good surface finish - **Cost-Effective:** Competitive pricing compared to rare-earth containing alloys --- #### **3. Chemical Composition (Weight %)** | Element | Magnesium (Balance) | Zinc | Zirconium | Manganese (max) | Silicon (max) | Iron (max) | Copper (max) | Nickel (max) | Other (max) | |---------------|---------------------|--------------|--------------|-----------------|---------------|------------|--------------|--------------|-------------| | **Content (%)** | ~97.0 | 2.0-2.5 | 0.45-0.80 | 0.15 | 0.10 | 0.05 | 0.05 | 0.005 | 0.30 total | *Note: The precise balance of zinc (typically 2.3% nominal) and zirconium (typically 0.65% nominal) creates optimal strengthening through solid solution and grain refinement mechanisms without compromising ductility.* --- #### **4. Typical Physical & Mechanical Properties** **Physical Properties:** | Property | Value | |---------------------------|------------------------------| | **Density** | 1.78 g/cm³ (0.064 lb/in³) | | **Melting Range** | 630-650°C (1166-1202°F) | | **Thermal Conductivity** | 121 W/m·K | | **Specific Heat Capacity**| 1040 J/kg·K | | **Coefficient of Thermal Expansion** | 26.1 × 10⁻⁶/°C | | **Electrical Resistivity**| 7.5 μΩ·cm | **Mechanical Properties (As-Fabricated - F Temper):** | Product Form | Ultimate Tensile Strength (MPa) | Tensile Yield Strength (MPa) | Elongation (%) | Compression Yield Strength (MPa) | |-----------------|----------------------------------|-------------------------------|----------------|----------------------------------| | **Extruded Bar**| 255-290 | 165-195 | 12-18 | 155-185 | | **Sheet/Plate** | 240-275 | 150-180 | 10-16 | 145-175 | | **Rod** | 260-295 | 170-200 | 11-17 | 160-190 | *Additional Mechanical Properties:* - **Shear Strength:** 145-170 MPa - **Fatigue Strength:** 115-135 MPa (10⁷ cycles) - **Elastic Modulus:** 45 GPa (6.5×10⁶ psi) - **Poisson's Ratio:** 0.35 - **Hardness:** 60-70 HB --- #### **5. International Standards & Specifications** ZK21A complies with the following international standards: - **ASTM B107/B107M:** Magnesium-Alloy Extruded Bars, Rods, Profiles, Tubes, and Wire - **ASTM B90/B90M:** Magnesium-Alloy Sheet and Plate - **UNS M16210:** Unified Numbering System - **AMS 4354:** Aerospace Material Specification for Sheet and Plate - **ISO 3116:** Wrought magnesium and magnesium alloys - **DIN 9719:** Magnesium sheets and plates --- #### **6. Applications** **Aerospace & Defense:** - Aircraft and helicopter seat frames - Equipment mounting brackets and supports - Interior structural components - Missile and drone components - Radar and electronic housing frames **Transportation & Automotive:** - Automotive seat structures - Bicycle frames and components - Racing vehicle components - Material handling equipment parts - Truck and trailer components **Industrial & Consumer:** - Power tool housings and components - Portable instrument frames - Camera and optical equipment bodies - Sports equipment (tennis rackets, golf clubs) - Luggage frames and structural components - Portable medical equipment frames **Electronics:** - Laptop and tablet cases - Portable electronic device enclosures - Heat sink components - Server and networking equipment parts --- #### **7. Processing & Fabrication Guidelines** **Hot Working:** - **Extrusion Temperature:** 320-400°C (608-752°F) - **Rolling Temperature:** 300-450°C (572-842°F) - **Forging Temperature:** 350-450°C (662-842°F) **Forming Operations:** - **Hot Forming:** 200-300°C (392-572°F) recommended - **Cold Forming:** Limited to simple bends with large radii - **Annealing:** 345°C for 1 hour if required for additional forming **Machining:** - Excellent machinability rating (100% relative to steel) - High cutting speeds with proper cooling - Produces small, broken chips - Good surface finish achievable **Joining:** - **TIG Welding:** Recommended with proper filler material - **MIG Welding:** Suitable for thicker sections - **Resistance Welding:** Applicable for sheet materials - **Adhesive Bonding:** Good compatibility with structural adhesives **Heat Treatment:** - Typically used in F temper (as-fabricated) - Stress relief: 260°C for 30 minutes if required --- #### **8. Quality Assurance & Certification** - **Chemical Certification:** Mill certification to specified composition - **Mechanical Testing:** Certified tensile and yield strength values - **Grain Size Control:** Typically ASTM 8-10 for wrought products - **Non-Destructive Testing:** Ultrasonic, dye penetrant available - **Dimensional Compliance:** Meets applicable dimensional standards --- **Disclaimer** This technical data is for reference purposes. Actual properties may vary based on manufacturing process, section size, and processing parameters. Users should conduct appropriate testing to verify suitability for specific applications. All machining and processing must follow established safety procedures for magnesium alloys, including proper chip management and fire prevention measures.

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 3366 gallon liquid totes Special package is available on request.