2017-O Aluminum alloy,Aluminum 2017-O alloy,E FORU

### **2017-O Aluminum Alloy Product Introduction** **Overview** 2017-O Aluminum Alloy is the annealed (soft) condition of the standard 2017 aluminum-copper alloy. The "O" temper signifies that the material has been fully annealed, a heat treatment process that involves heating the metal to a specific temperature and then slowly cooling it. This process results in the softest and most ductile state of the alloy, with the lowest strength but the highest formability. 2017-O is primarily used as a starting material for severe forming operations, after which it can be heat-treated to develop its characteristic high strength. --- #### **1. Chemical Composition (Typical Weight %)** The chemical composition of 2017-O Aluminum Alloy is identical to that of 2017/2017A in other tempers, as the "O" condition refers only to its thermal treatment. | Element | Minimum (%) | Maximum (%) | Notes | | :--- | :--- | :--- | :--- | | **Aluminum (Al)** | Balance | Balance | - | | **Copper (Cu)** | 3.5 | 4.5 | Primary alloying element | | **Magnesium (Mg)** | 0.40 | 0.8 | Secondary strengthening element | | **Manganese (Mn)** | 0.40 | 1.0 | Controls grain structure | | **Silicon (Si)** | 0.20 | 0.8 | Impurity, contributes to strength after heat treatment | | **Iron (Fe)** | - | 0.7 | Impurity | | **Zinc (Zn)** | - | 0.25 | Impurity | | **Chromium (Cr)** | - | 0.10 | Impurity | | **Others (Each)** | - | 0.05 | - | | **Others (Total)** | - | 0.15 | - | **Key Point:** The high Copper content is the key to this alloy's ability to be strengthened via heat treatment. In the "-O" temper, the alloying elements are in a more dissolved state, ready to form strengthening precipitates upon aging. --- #### **2. Physical Properties** The physical properties are consistent across all tempers of 2017 alloy. | Property | Value / Description | | :--- | :--- | | **Density** | 2.79 g/cm³ (0.101 lb/in³) | | **Melting Range** | ~ 510°C - 640°C (950°F - 1185°F) | | **Electrical Conductivity** | ~ 34-40% IACS (International Annealed Copper Standard) | | **Thermal Conductivity** | ~ 134 W/m·K | | **Coefficient of Thermal Expansion** | ~ 23.6 x 10⁻⁶/°C (20-100°C) | --- #### **3. Mechanical Properties (Typical for O Temper)** The "-O" temper is characterized by very low strength and high ductility, making it ideal for complex forming operations. | Temper | Tensile Strength | Yield Strength (0.2% Offset) | Elongation (% in 50mm) | Hardness | | :--- | :--- | :--- | :--- | :--- | | **2017-O** | ~ 180 MPa (26 ksi) | ~ 70 MPa (10 ksi) | ~ 20% | ~ 45 HB | *Note: These values are typical and represent the maximum formability and minimum strength of the 2017 alloy system. The material is supplied in this condition specifically to be formed and then heat-treated.* --- #### **4. International Standards** 2017 Aluminum Alloy in the annealed temper is recognized under major international standards. | Standard System | Alloy Designation | Temper | | :--- | :--- | :--- | | **ISO** | **AlCu4MgSi** | O | | **ASTM (USA)** | **2017** | O | | **EN (Europe)** | **EN AW-2017A** | O | | **UNS (USA)** | **A92017** | O | | **JIS (Japan)** | **A2017** | O | --- #### **5. Product Applications** 2017-O is not used in its delivered state for final applications. Its sole purpose is to serve as a formable precursor to high-strength components. The typical workflow is: **Form (in -O condition) -> Solution Heat Treat -> Quench -> Age (to T4 or other temper)**. * **Aerospace Industry:** * Complexly shaped rivets, brackets, and fittings that require severe cold heading or forging before heat treatment. * **General Manufacturing:** * Components that require deep drawing, severe bending, or other high-deformation processes that would be impossible in the high-strength T4 condition. * **Prototype Development:** * Used for creating prototype parts where easy machining and forming are essential before committing to the full heat-treatment cycle. --- #### **6. Key Advantages & Considerations** * **Advantages:** * **Maximum Ductility and Formability:** Allows for the most severe and complex cold-forming operations. * **Good Machinability:** Softer than its aged counterparts, making it easier to machine, though chip formation may be less favorable than in the T4 temper. * **Heat-Treatable:** This is its primary function. After forming, it can be strengthened to the high levels characteristic of the 2017-T4 temper. * **Considerations:** * **Very Low Strength in Delivered State:** The component has minimal structural integrity in the "-O" condition and **must be heat-treated** for service. * **Requires Secondary Processing:** The full manufacturing process is longer, involving both forming and heat treatment, which adds cost and time. * **Dimensional Changes:** During heat treatment (quenching in particular), the part may undergo slight warping or dimensional changes that must be accounted for in the design. * **Poor Corrosion Resistance:** Like all 2017 tempers, it has low corrosion resistance and typically requires protective coatings (anodizing, alclad, paint) after heat treatment. **Conclusion** 2017-O Aluminum Alloy is a process-oriented material, not a final-state one. It is the foundational, formable version of a high-strength alloy. Its value lies in its ability to be heavily worked into complex shapes that would be unachievable with the high-strength 2017-T4 material. For manufacturers who need to produce intricate, high-strength aluminum components, 2017-O provides the essential first step in the "form-then-harden" manufacturing sequence.

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 1525 gallon liquid totes Special package is available on request.