Magnesium ZM21-F, Forgings,E FOUR

### **Product Datasheet: Magnesium ZM21-F, Forgings** **Medium-Strength Forged Magnesium Alloy with Excellent Formability** --- #### **1. Overview** Magnesium ZM21-F is a medium-strength forged magnesium alloy that combines manganese and zinc additions to achieve a balanced combination of strength, ductility, and corrosion resistance. Supplied in the "F" temper (as-forged) condition without subsequent heat treatment, this alloy offers excellent forgeability and good mechanical properties for applications requiring lightweight structural components with moderate strength requirements. The forging process enhances grain structure and mechanical properties compared to cast products. --- #### **2. Key Features & Advantages** - **Good Strength-to-Weight Ratio:** Favorable mechanical properties with low density - **Excellent Forgeability:** Can be forged into complex shapes with good detail definition - **Good Corrosion Resistance:** Manganese addition enhances environmental performance - **Cost-Effective:** No heat treatment required, reducing manufacturing costs - **Good Weldability:** Suitable for repair and fabrication welding - **Excellent Machinability:** High material removal rates with good surface finish - **Good Damping Capacity:** Effective vibration absorption characteristics --- #### **3. Chemical Composition (Weight %)** | Element | Magnesium (Balance) | Zinc | Manganese | Silicon (max) | Copper (max) | Other Elements (max) | |---------------|---------------------|--------------|--------------|---------------|--------------|---------------------| | **Content (%)** | - | 1.8-2.5 | 0.6-1.4 | 0.10 | 0.05 | 0.30 total | *Note: The balanced zinc content provides moderate solid solution strengthening, while manganese enhances corrosion resistance and contributes to grain refinement during the forging process.* --- #### **4. Typical Physical & Mechanical Properties (F Temper - As Forged)** **Physical Properties:** | Property | Value | |---------------------------|------------------------------| | **Density** | 1.79 g/cm³ (0.0646 lb/in³) | | **Melting Range** | 630-650°C (1166-1202°F) | | **Thermal Conductivity** | 118 W/m·K | | **Specific Heat Capacity**| 1020 J/kg·K | | **Coefficient of Thermal Expansion** | 26.2 × 10⁻⁶/°C | | **Electrical Resistivity**| 8.5 μΩ·cm | **Mechanical Properties (Forged - F Temper):** | Property | Longitudinal Direction | Transverse Direction | |---------------------------|--------------------------|-------------------------| | **Ultimate Tensile Strength** | 220-260 MPa (32-38 ksi) | 200-240 MPa (29-35 ksi) | | **Tensile Yield Strength**| 140-180 MPa (20-26 ksi) | 130-170 MPa (19-25 ksi) | | **Elongation** | 12-20% | 10-18% | | **Compressive Yield Strength** | 135-175 MPa (20-25 ksi) | 125-165 MPa (18-24 ksi) | | **Shear Strength** | 130-160 MPa (19-23 ksi) | 120-150 MPa (17-22 ksi) | | **Fatigue Strength** | 95-115 MPa (14-17 ksi) | 85-105 MPa (12-15 ksi) | | **Elastic Modulus** | 45 GPa (6.5×10⁶ psi) | 45 GPa (6.5×10⁶ psi) | | **Hardness** | 50-60 HB | 45-55 HB | | **Impact Toughness** | 10-15 J | 8-13 J | --- #### **5. International Standards** ZM21-F Forgings conform to the following specifications: - **ASTM B91:** Standard Specification for Magnesium-Alloy Forgings - **ISO 3116:** Wrought magnesium and magnesium alloys - **DIN 9719:** Magnesium wrought alloys - **Customer-Specific Forging Specifications** - **Proprietary Material Standards** --- #### **6. Applications** **Aerospace Components:** - Aircraft interior structural brackets - Equipment mounting frames and supports - Access door frames and components - Non-critical structural attachments - Avionics equipment supports **Automotive & Transportation:** - Automotive seat frames and components - Motorcycle footpegs and brackets - Bicycle crank arms and bottom brackets - Truck cab components - Recreational vehicle parts **Industrial Equipment:** - Power tool housings and components - Material handling equipment parts - Machinery guards and covers - Portable equipment frames - Hand tool components **Consumer Products:** - Sports equipment components - Camera and optical equipment bodies - Portable electronic device frames - Furniture components - Musical instrument parts **Special Applications:** - Portable medical equipment frames - Laboratory equipment components - Display and exhibit structures - Temporary structure components --- #### **7. Forging & Processing Parameters** **Forging Conditions:** - **Billet Temperature:** 350-450°C (662-842°F) - **Die Temperature:** 200-300°C (392-572°F) - **Forging Pressure:** 40-80 MPa (6-12 ksi) - **Strain Rates:** Moderate for optimal grain structure - **Draft Angles:** 3-5° recommended **Typical Forging Products:** - **Closed-Die Forgings:** Complex shapes with good detail - **Open-Die Forgings:** Simple shapes and pre-forms - **Press Forgings:** High-volume production parts - **Hand Forgings:** Custom and prototype components **Machining Characteristics:** - **Machinability Rating:** Excellent - **Cutting Speed:** 300-500 m/min recommended - **Surface Finish:** 1.6-3.2 μm Ra achievable - **Tool Life:** Extended tool life compared to steel - **Chip Characteristics:** Small, easily managed chips **Joining Methods:** - **TIG Welding:** Good with proper filler material - **MIG Welding:** Suitable for production applications - **Adhesive Bonding:** Good with proper surface preparation - **Mechanical Fastening:** Good thread strength properties --- #### **8. Quality Assurance & Specifications** - **Dimensional Inspection:** Per forging drawing requirements - **Surface Quality:** Visual inspection for forging defects - **Ultrasonic Testing:** Available for critical applications - **Mechanical Testing:** From forging extensions or test coupons - **Chemical Analysis:** Mill certification available - **Grain Size Examination:** ASTM 6-8 typical for forgings --- **Disclaimer** This technical data represents typical properties for ZM21-F forgings. Properties may vary based on forging design, process parameters, and section size. The F temper condition provides good mechanical properties without additional heat treatment, offering manufacturing efficiency and cost savings for appropriate applications. 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 be followed throughout manufacturing 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 3379 gallon liquid totes Special package is available on request.