Magnesium AZ31C-F,UNS M11312,E FOUR

Magnesium AZ31C-F (UNS M11312) Alloy Product Introduction** **Product Description:** Magnesium AZ31C-F is a wrought magnesium alloy closely related to the more common AZ31B. Designated as **UNS M11312**, its primary distinction lies in its slightly higher aluminum content. The "F" temper indicates that it is in the as-fabricated condition, meaning it has been formed by a process like extrusion or rolling without any subsequent heat treatment. This alloy, often referred to by its base composition **Mg-3Al-1Zn**, is engineered to offer good strength, ductility, and corrosion resistance, making it a suitable material for lightweight structural components. --- #### **1. Chemical Composition (Weight %)** The chemical composition of AZ31C-F differentiates it from AZ31B primarily through its aluminum content and impurity limits. | Element | Minimum (%) | Maximum (%) | Key Function & Note | | :--- | :--- | :--- | :--- | | **Aluminum (Al)** | 3.0 | 4.0 | **Primary strengthener. Higher range than AZ31B.** | | **Zinc (Zn)** | 0.2 | 1.0 | Enhances strength and corrosion resistance. | | **Manganese (Mn)** | 0.15 | 0.50 | Improves corrosion resistance by forming stable compounds with iron. | | **Silicon (Si)** | - | 0.10 | Impurity control. | | **Copper (Cu)** | - | 0.05 | Impurity control (minimized for corrosion resistance). | | **Iron (Fe)** | - | 0.005 | Impurity control (strictly limited for corrosion resistance). | | **Nickel (Ni)** | - | 0.005 | Impurity control (strictly limited for corrosion resistance). | | **Other Elements** | - | 0.30 (total) | - | | **Magnesium (Mg)** | **Balance** | | | *Note: The key difference from AZ31B is the higher maximum Aluminum content (4.0% vs. 3.5%). The "F" temper means properties are directly from the fabrication process.* --- #### **2. Physical Properties** | Property | Value / Description | Condition | | :--- | :--- | :--- | | **Density** | 1.77 - 1.79 g/cm³ (0.064 - 0.065 lb/in³) | At 20°C | | **Melting Point** | ~ 605 - 630 °C (1121 - 1166 °F) | - | | **Thermal Conductivity** | 76 - 96 W/m·K | At 25°C | | **Coefficient of Thermal Expansion** | 26.0 μm/m·°C | 20 - 100°C | | **Electrical Resistivity** | ~ 92 nΩ·m | At 20°C | | **Modulus of Elasticity** | 45 GPa (6.5 x 10⁶ psi) | - | | **Shear Modulus** | 17 GPa (2.4 x 10⁶ psi) | - | | **Poisson's Ratio** | 0.35 | - | --- #### **3. Mechanical Properties (Typical for F Temper - As-Fabricated)** Properties are highly dependent on the specific fabrication process (e.g., extrusion speed, rolling reduction) and section size. | Property | Typical Value Range | | :--- | :--- | | **Tensile Strength** | 240 - 290 MPa (35 - 42 ksi) | | **Yield Strength (0.2% Offset)** | 150 - 220 MPa (22 - 32 ksi) | | **Elongation** | 10 - 20% | | **Hardness** | 50 - 60 HB | --- #### **4. International Standards** AZ31C is specified in several key international standards, often alongside AZ31B. | Standard Organization | Standard Designation for AZ31C | | :--- | :--- | | **ASTM International** | **ASTM B107/B107M** (Extruded Rod, Bar, Shapes) | | **SAE International** | **SAE J465** | | **UNS (Unified Numbering System)** | **M11312** | | **AMS (Aerospace Material Spec.)** | **AMS 4376** (Sheet and Plate) | *Note: AZ31C is less commonly referenced than AZ31B in modern standards, with AZ31B often being the preferred grade due to its more optimized balance of properties. Always check the latest material specifications for a given project.* --- #### **5. Product Applications** AZ31C-F is used in applications similar to AZ31B where its specific as-fabricated properties are suitable. Its primary use is in forms like extrusions and rolled sheet. * **Aerospace:** * Non-critical structural brackets and components * Interior panels and covers * **Automotive:** * Seat frames and inner door structures * Support brackets * **General Industry:** * Material handling components * Jigs and fixtures where lightweight is beneficial * Covers and housings for portable equipment --- #### **6. Key Characteristics & Considerations** * **Advantages:** * **Extremely Lightweight:** Similar very low density as other magnesium alloys. * **Good Specific Strength:** Favorable strength-to-weight ratio. * **Good Machinability:** Can be machined at high speeds with excellent surface finish. * **Good Damping Capacity:** Effectively absorbs vibration and noise. * **Considerations:** * **As-Fabricated State (F Temper):** Properties are not optimized by heat treatment and can vary more than a tempered alloy like AZ31B-T1. * **Corrosion:** Like all magnesium alloys, it requires protective coatings or cladding for use in severe environments. * **Lower High-Temperature Strength:** Mechanical properties degrade significantly above ~120°C (250°F). * **Flammability:** Fine chips and powder are flammable; proper machining practices are essential. **Summary:** **Magnesium AZ31C-F (UNS M11312)** is a standard wrought magnesium alloy with a slightly higher aluminum content than AZ31B, supplied in the as-fabricated condition. While **AZ31B is generally the more prevalent and specified alloy**, AZ31C-F finds its place in specific fabricated components where its inherent properties meet application requirements without the need for subsequent heat treatment.

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 3292 gallon liquid totes Special package is available on request.