AZ31B Magnesium Alloys,E FOUR

### **Product Datasheet: AZ31B Magnesium Alloy** **Versatile Wrought Magnesium Alloy with Balanced Properties** --- #### **1. Overview** AZ31B is one of the most widely used wrought magnesium alloys, offering an excellent balance of strength, ductility, and corrosion resistance. This aluminum-zinc-manganese system alloy demonstrates good formability, weldability, and mechanical properties, making it suitable for various applications across aerospace, automotive, and industrial sectors. Available in multiple tempers including O (annealed), H24 (strain-hardened and partially annealed), and F (as-fabricated), AZ31B provides reliable performance in diverse operating conditions. --- #### **2. Key Features & Advantages** - **Good Strength-to-Weight Ratio:** Combines moderate strength with magnesium's inherent lightness - **Excellent Formability:** Can be rolled, extruded, and forged into complex shapes - **Good Corrosion Resistance:** Superior to many other magnesium alloys - **Excellent Machinability:** High cutting speeds with good surface finish - **Good Weldability:** Suitable for most common welding processes - **Cost-Effective:** Widely available with competitive pricing - **Recyclable:** Environmentally friendly material option --- #### **3. Chemical Composition (Weight %)** | Element | Magnesium (Balance) | Aluminum | Zinc | Manganese | Silicon (max) | Copper (max) | Other Elements (max) | |---------------|---------------------|--------------|--------------|--------------|---------------|--------------|---------------------| | **Content (%)** | - | 2.5-3.5 | 0.6-1.4 | 0.20-1.0 | 0.10 | 0.05 | 0.30 total | *Note: Aluminum provides solid solution strengthening, zinc enhances strength and corrosion resistance, while manganese improves corrosion resistance by removing iron impurities.* --- #### **4. Typical Physical & Mechanical Properties** **Physical Properties:** | Property | Value | |---------------------------|------------------------------| | **Density** | 1.77 g/cm³ (0.064 lb/in³) | | **Melting Range** | 605-630°C (1121-1166°F) | | **Thermal Conductivity** | 76 W/m·K | | **Specific Heat Capacity**| 1040 J/kg·K | | **Coefficient of Thermal Expansion** | 26.0 × 10⁻⁶/°C | | **Electrical Resistivity**| 9.2 μΩ·cm | **Mechanical Properties by Temper:** | Property | O Temper (Annealed) | H24 Temper (Sheet) | F Temper (As-Fabricated) | |---------------------------|-------------------------|-------------------------|--------------------------| | **Ultimate Tensile Strength** | 165 MPa (24 ksi) | 235 MPa (34 ksi) | 255 MPa (37 ksi) | | **Tensile Yield Strength**| 105 MPa (15 ksi) | 145 MPa (21 ksi) | 195 MPa (28 ksi) | | **Elongation** | 15-21% | 12-18% | 8-15% | | **Compressive Yield Strength** | 105 MPa (15 ksi) | 145 MPa (21 ksi) | 195 MPa (28 ksi) | | **Shear Strength** | 130 MPa (19 ksi) | 165 MPa (24 ksi) | 180 MPa (26 ksi) | | **Fatigue Strength** | 105 MPa (15 ksi) | 125 MPa (18 ksi) | 140 MPa (20 ksi) | | **Elastic Modulus** | 45 GPa (6.5×10⁶ psi) | 45 GPa (6.5×10⁶ psi) | 45 GPa (6.5×10⁶ psi) | | **Hardness** | 45-55 HB | 55-65 HB | 60-70 HB | --- #### **5. International Standards** AZ31B is specified in numerous international standards: - **ASTM B90/B90M:** Magnesium-Alloy Sheet and Plate - **ASTM B107/B107M:** Magnesium-Alloy Extruded Bars, Rods, Profiles, Tubes, and Wire - **AMS 4375:** Aerospace Material Specification for Sheet and Plate - **AMS 4376:** Aerospace Material Specification for Annealed Sheet and Plate - **ISO 3116:** Wrought magnesium and magnesium alloys - **DIN 9719:** Magnesium wrought alloys - **JIS H 4201:** Magnesium alloy sheets and plates --- #### **6. Applications** **Aerospace & Defense:** - Aircraft interior components and panels - Helicopter transmission housings - Missile and drone components - Satellite structural parts - Avionics equipment enclosures **Automotive Industry:** - Automotive seat frames - Steering wheel cores - Transmission cases - Engine blocks and covers - Bracket and support components **Electronics & Consumer Goods:** - Laptop computer cases - Camera bodies and components - Mobile device housings - Power tool bodies - Sports equipment **Industrial Applications:** - Machinery components and guards - Material handling equipment - Printing and textile machinery - Food processing equipment - Medical device components **Transportation:** - Bicycle frames and components - Motorcycle parts - RV and trailer components - Marine equipment - Railway carriage components --- #### **7. Processing & Fabrication** **Forming Operations:** - **Hot Working Temperature:** 230-400°C (446-752°F) - **Cold Working:** Limited to mild forming operations - **Annealing Temperature:** 345°C (653°F) for 1-2 hours - **Minimum Bend Radius:** 3-5 × material thickness **Machining Characteristics:** - **Machinability:** Excellent (compared to 100% for free-cutting brass) - **Cutting Speed:** 300-600 m/min recommended - **Surface Finish:** Very good to excellent - **Tool Life:** Extended with proper cooling - **Chip Control:** Small, easily managed chips **Joining Methods:** - **TIG Welding:** Excellent with proper filler wire - **MIG Welding:** Suitable for production applications - **Resistance Welding:** Good for sheet materials - **Adhesive Bonding:** Excellent with surface preparation - **Mechanical Fastening:** Good thread strength **Surface Treatment:** - **Chemical Conversion:** Chromate and phosphate coatings - **Anodizing:** HAE and other magnesium anodizing processes - **Painting:** Excellent adhesion with proper preparation - **Plating:** Requires special pre-treatment processes --- #### **8. Quality Assurance & Standards Compliance** - **Chemical Certification:** Mill certification to specified composition - **Mechanical Testing:** Certified tensile and yield strength values - **Dimensional Compliance:** Meets applicable ASTM/ISO standards - **Surface Quality:** Controlled surface defects and finish - **Traceability:** Full material traceability available --- **Disclaimer** This technical data provides general information about AZ31B magnesium alloy characteristics and typical properties. Actual properties may vary depending on manufacturing process, product form, temper condition, and section size. 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 prevention during machining 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 3385 gallon liquid totes Special package is available on request.