Magnesium AZ31B-F,UNS M11311,E FOUR

Product Datasheet: Magnesium Alloy AZ31B-F (UNS M11311)** **1.0 General Overview** Magnesium Alloy AZ31B-F is one of the most widely used and commercially available wrought magnesium alloys. The "F" temper designation indicates that it is in the as-fabricated condition (e.g., as-extruded, as-rolled). This alloy offers an excellent balance of moderate strength, good ductility, and commendable corrosion resistance. Its exceptional strength-to-weight ratio, combined with good formability and machinability, makes it a premier choice for lightweight structural applications across various industries. **2.0 Chemical Composition (Weight % - Typical)** The chemical composition conforms to major international standards. Impurity control is crucial for enhancing corrosion performance. | Element | Minimum (%) | Maximum (%) | Typical (%) | | :------ | :---------- | :---------- | :---------- | | Aluminum (Al) | 2.50 | 3.50 | 3.10 | | Zinc (Zn) | 0.60 | 1.40 | 1.00 | | Manganese (Mn) | 0.20 | 1.00 | 0.50 | | Silicon (Si) | - | 0.10 | 0.05 | | Copper (Cu) | - | 0.05 | 0.01 | | Iron (Fe) | - | 0.005 | 0.003 | | Nickel (Ni) | - | 0.005 | 0.001 | | Calcium (Ca) | - | 0.04 | - | | Other Impurities (each) | - | 0.30 | - | | **Magnesium (Mg)** | **Balance** | **Balance** | **Balance** | *Note: The very low limits on Iron (Fe), Copper (Cu), and Nickel (Ni) are critical for achieving good corrosion resistance.* **3.0 Physical Properties** | Property | Value (Metric) | Value (Imperial) | | :--- | :--- | :--- | | Density | 1.77 g/cm³ | 0.0639 lb/in³ | | Melting Range | ~605 - 630 °C | ~1121 - 1166 °F | | Thermal Conductivity | 96 W/m·K (at 25°C) | 665 BTU·in/(hr·ft²·°F) | | Electrical Resistivity | 92 nΩ·m | 92 μΩ·cm | | Modulus of Elasticity (Tension) | 45 GPa | 6.5 x 10⁶ psi | | Coefficient of Thermal Expansion (20-100°C) | 26 μm/m·°C | 14.4 μin/in·°F | **4.0 Mechanical Properties (Typical for Extruded Sections - F Temper)** Properties are typical for sections up to 25 mm (1 inch) thickness and can vary with section size and fabrication process. | Property | Value (Metric) | Value (Imperial) | | :--- | :--- | :--- | | Ultimate Tensile Strength | 255 - 290 MPa | 37,000 - 42,000 psi | | Tensile Yield Strength (0.2% Offset) | 150 - 220 MPa | 22,000 - 32,000 psi | | Compressive Yield Strength | 95 - 145 MPa | 14,000 - 21,000 psi | | Elongation at Break (in 50 mm) | 7 - 15 % | 7 - 15 % | | Hardness (Brinell, 500 kg load) | 49 - 56 HB | 49 - 56 HB | | Shear Strength | 130 - 140 MPa | 19,000 - 20,300 psi | | Fatigue Strength (Rotating Beam, 5x10⁸ cycles) | 97 - 130 MPa | 14,000 - 19,000 psi | **5.0 Key Characteristics & Advantages** * **Lightweight:** Extremely low density, providing one of the best strength-to-weight ratios among common structural metals. * **Good Corrosion Resistance:** Offers respectable resistance to atmospheric corrosion, especially when impurities (Fe, Ni, Cu) are strictly controlled. * **Excellent Machinability:** Can be machined at high speeds with excellent surface finish and low power requirements. Chips are small and break easily. * **Good Damping Capacity:** Superior ability to absorb vibrational energy and noise compared to aluminum and steel. * **Good Formability:** Can be rolled, extruded, and forged. It exhibits good ductility at elevated temperatures (200-400°C). * **Recyclability:** Fully recyclable with established recycling streams. **6.0 Product Applications** AZ31B-F is a versatile alloy used in numerous weight-sensitive applications: * **Aerospace:** Aircraft fuselage and door frames, canopy frames, gearbox housings, interior components, and electronic equipment racks. * **Automotive:** Steering wheels, seat frames, transmission cases, valve covers, and various brackets. * **Electronics:** Housings for laptops, projectors, digital cameras, and mobile phones, benefiting from lightness, rigidity, and EMI shielding. * **Industrial:** Material handling equipment, jigs, fixtures, and lightweight platforms for automation. * **Sporting Goods:** Bicycle frames, tennis racket frames, archery bows, and backpack frames. * **Defense:** Components for portable military equipment, drones (UAVs), and optical instruments. **7.0 International Standard Designations** AZ31B-F (UNS M11311) is recognized under various standard systems: * **ASTM:** ASTM B107/B107M (Extruded Bars, Rods, Profiles, Tubes), ASTM B90/B90M (Sheet and Plate) * **UNS:** UNS M11311 * **SAE:** AMS 4355 (Extruded Bars and Shapes) * **EN / European:** Mg-Al3Zn1 (EN 1753:1997 - Designation System) * **ISO:** ISO 3116:2007 (Wrought magnesium and magnesium alloys) - Designation: MA2-1 * **JIS:** JIS H 4203:2016 (Magnesium Alloy Plates and Sheets) **8.0 Fabrication & Handling** * **Machining:** Excellent machinability. Use sharp tools with high rake angles, high speeds, and low feed rates. Coolants like mineral spirits or air blast are recommended. * **Forming:** Hot forming is typically required. It can be successfully formed at temperatures between 225°C and 400°C (440°F - 750°F). * **Joining:** Can be welded using Tungsten Inert Gas (TIG) and Resistance Welding methods. Adhesive bonding is also very effective. * **Surface Treatment:** Requires surface finishing for optimal corrosion protection in harsh environments. Common treatments include chemical conversion coatings (e.g., chrome pickle, phosphate), anodizing (e.g., Magoxid-Coat, Tagnite, HAE), and painting or powder coating. * **Safety:** Machining and grinding generate fine chips and dust which are flammable. Strict adherence to safety protocols, including the use of proper dust collection systems, is mandatory to prevent fire hazards. **Disclaimer** The information provided in this datasheet is typical and for informational purposes only. It is not a substitute for specific technical advice. Mechanical and physical properties can vary based on manufacturing process, section size, and lot. Users should conduct their own tests and consult with the material supplier to verify the suitability of AZ31B-F for a specific application. **[End of Document Content]**

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 3290 gallon liquid totes Special package is available on request.