Magnesium ZM21-H24,,E FOUR

### **Product Datasheet: Magnesium ZM21-H24** **Moderate-Strength Strain-Hardened Magnesium Alloy** --- #### **1. Overview** Magnesium ZM21-H24 is a moderate-strength wrought magnesium alloy supplied in the H24 temper (strain-hardened and partially annealed). This alloy achieves its mechanical properties through a combination of zinc and manganese additions, followed by controlled rolling and partial annealing processes. The H24 temper provides an excellent balance of strength and ductility, making it suitable for sheet and plate applications requiring good formability combined with moderate strength characteristics. --- #### **2. Key Features & Advantages** - **Balanced Strength and Ductility:** Optimal combination for forming operations - **Good Corrosion Resistance:** Manganese addition enhances environmental performance - **Excellent Formability:** Can be formed into complex shapes at elevated temperatures - **Good Weldability:** Suitable for various welding processes - **Cost-Effective:** Lower cost than zirconium-containing alloys - **Good Machinability:** High material removal rates with good surface finish - **Light Weight:** 35% lighter than aluminum alloys --- #### **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 zinc content provides solid solution strengthening, while manganese enhances corrosion resistance and contributes to grain refinement during processing. The H24 temper indicates strain hardening followed by partial annealing.* --- #### **4. Typical Physical & Mechanical Properties (H24 Temper)** **Physical Properties:** | Property | Value | |---------------------------|------------------------------| | **Density** | 1.79 g/cm³ (0.0646 lb/in³) | | **Melting Range** | 630-650°C (1166-1202°F) | | **Thermal Conductivity** | 119 W/m·K | | **Specific Heat Capacity**| 1015 J/kg·K | | **Coefficient of Thermal Expansion** | 26.5 × 10⁻⁶/°C | | **Electrical Resistivity**| 8.3 μΩ·cm | **Mechanical Properties (H24 Temper - Sheet/Plate):** | Property | 1.0-3.0 mm thickness | 3.1-6.0 mm thickness | 6.1-12.0 mm thickness | |---------------------------|--------------------------|--------------------------|--------------------------| | **Ultimate Tensile Strength** | 230-270 MPa (33-39 ksi) | 220-260 MPa (32-38 ksi) | 210-250 MPa (30-36 ksi) | | **Tensile Yield Strength**| 160-200 MPa (23-29 ksi) | 150-190 MPa (22-28 ksi) | 140-180 MPa (20-26 ksi) | | **Elongation** | 10-16% | 12-18% | 14-20% | | **Compressive Yield Strength** | 150-190 MPa (22-28 ksi) | 140-180 MPa (20-26 ksi) | 130-170 MPa (19-25 ksi) | | **Shear Strength** | 140-170 MPa (20-25 ksi) | 135-165 MPa (20-24 ksi) | 130-160 MPa (19-23 ksi) | | **Fatigue Strength** | 100-120 MPa (15-17 ksi) | 95-115 MPa (14-17 ksi) | 90-110 MPa (13-16 ksi) | | **Elastic Modulus** | 45 GPa (6.5×10⁶ psi) | 45 GPa (6.5×10⁶ psi) | 45 GPa (6.5×10⁶ psi) | | **Hardness** | 55-65 HB | 50-60 HB | 45-55 HB | --- #### **5. International Standards** ZM21-H24 conforms to the following specifications: - **ASTM B90/B90M:** Standard Specification for Magnesium-Alloy Sheet and Plate - **ISO 3116:** Wrought magnesium and magnesium alloys - **AMS 4377:** Aerospace Material Specification for Sheet and Plate - **DIN 9719:** Magnesium sheets and plates - **GB/T 5154:** Chinese National Standard for Magnesium Alloy Sheets --- #### **6. Applications** **Aerospace Components:** - Aircraft interior panels and partitions - Equipment access doors and covers - Non-structural fairings and covers - Instrument panels and enclosures - Cabin interior components **Transportation Industry:** - Automotive interior panels - Truck body components - Recreational vehicle parts - Marine equipment enclosures - Railway carriage interior panels **Electronics & Enclosures:** - Laptop computer cases - Portable electronic device housings - Instrument cases and covers - Communication equipment enclosures - Display panel backings **Industrial Applications:** - Machinery guards and covers - Process equipment panels - Material handling components - Workstation components - Safety equipment housings **Consumer Products:** - Luggage frames and panels - Sports equipment components - Furniture parts and panels - Display and exhibit structures - Artistic and decorative elements --- #### **7. Processing & Fabrication Parameters** **Forming Characteristics:** - **Hot Forming Temperature:** 200-300°C (392-572°F) - **Cold Forming:** Limited to simple bends with large radii - **Minimum Bend Radius:** 3-5 × thickness for 90° bends - **Springback:** Moderate, requires compensation in tooling **Heat Treatment:** - **H24 Temper Process:** Strain hardened then partially annealed - **Annealing Temperature:** 260-290°C (500-554°F) if required - **Stress Relief:** 150-200°C (302-392°F) for 30-60 minutes **Machining Characteristics:** - **Machinability Rating:** Excellent (comparable to brass) - **Cutting Speed:** 300-600 m/min recommended - **Surface Finish:** 0.8-3.2 μm Ra achievable - **Tool Life:** Extended compared to steel machining - **Coolant Requirements:** Recommended for optimal results **Joining Methods:** - **TIG Welding:** Good with proper filler material - **MIG Welding:** Suitable for production applications - **Resistance Welding:** Good for sheet materials - **Adhesive Bonding:** Excellent with proper surface preparation - **Mechanical Fastening:** Good thread strength properties **Surface Treatment:** - **Chemical Conversion:** Excellent response to chromate conversion - **Anodizing:** Suitable for various anodizing processes - **Painting:** Good adhesion with proper surface preparation - **Powder Coating:** Excellent results achievable --- #### **8. Quality Assurance & Specifications** - **Dimensional Tolerances:** Per ASTM B90 requirements - **Flatness Standards:** Commercial and precision grades available - **Surface Quality:** Mill finish with controlled surface defects - **Grain Size:** ASTM 7-9 typical for H24 temper - **Certification:** Mill certification to specified requirements - **Testing:** Tensile, hardness, and chemical analysis available --- **Disclaimer** This technical data represents typical properties for ZM21-H24 sheet and plate products. Properties may vary based on manufacturing process, thickness, and specific processing parameters. The H24 temper provides a good balance of strength and formability for a wide range of 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, particularly during machining and welding 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 3380 gallon liquid totes Special package is available on request.