2218-T72 Aluminum alloy,Aluminum 2218-T72 alloy,E FORU

### **Product Datasheet: 2218-T72 Aluminum Alloy** --- #### **1. Overview** 2218-T72 Aluminum Alloy is a high-temperature aluminum-copper alloy supplied in the T72 temper (solution heat-treated, quenched, and artificially aged to achieve maximum stress corrosion resistance). This specific temper condition provides the highest level of dimensional stability and corrosion resistance in the 2218 alloy series, while maintaining adequate high-temperature performance. The T72 condition is particularly designed for applications requiring exceptional resistance to stress corrosion cracking and long-term stability in demanding environments. --- #### **2. International Standards** - **UNS**: UNS A92218 - **ASTM**: ASTM B211 (Standard Specification for Aluminum and Aluminum-Alloy Bar, Rod, and Wire) - **AMS**: AMS 4127 (Aerospace Material Specification) - **AA (Aluminum Association)**: AA 2218 - **ISO**: ISO 6362 (Wrought Aluminum and Aluminum Alloy Extruded Rod/Bar, Tube, and Profiles) --- #### **3. Chemical Composition (Weight %)** | Element | Content (%) | |---------|-------------| | **Aluminum (Al)** | Balance | | **Copper (Cu)** | 3.5–4.5 | | **Magnesium (Mg)** | 1.2–1.8 | | **Iron (Fe)** | 0.9–1.3 | | **Silicon (Si)** | 0.9–1.2 | | **Nickel (Ni)** | 1.7–2.3 | | **Zinc (Zn)** | ≤ 0.25 | | **Manganese (Mn)** | ≤ 0.20 | | **Chromium (Cr)** | ≤ 0.10 | | **Titanium (Ti)** | ≤ 0.20 | | **Other Elements** | ≤ 0.05 each | | **Total Others** | ≤ 0.15 | --- #### **4. Physical Properties** | Property | Value | |----------|-------| | **Density** | 2.81–2.83 g/cm³ (0.1015–0.1022 lb/in³) | | **Melting Range** | ~530–640°C (985–1185°F) | | **Electrical Conductivity** | ~38–43 % IACS | | **Thermal Conductivity** | 130–150 W/m·K | | **Coefficient of Thermal Expansion** | 22.0–23.0 × 10⁻⁶/°C (20–100°C) | | **Modulus of Elasticity** | 72.0–74.0 GPa (10,450–10,750 ksi) | --- #### **5. Mechanical Properties (T72 Temper Condition)** | Property | Room Temperature | 200°C (390°F) | 250°C (480°F) | |----------|------------------|----------------|----------------| | **Tensile Strength (Ultimate)** | 340–390 MPa | 240–290 MPa | 180–230 MPa | | **Tensile Yield Strength** | 230–280 MPa | 160–210 MPa | 120–170 MPa | | **Elongation at Break** | 12–16% | 14–18% | 18–22% | | **Shear Strength** | 200–240 MPa | 140–180 MPa | 110–150 MPa | | **Hardness (Brinell)** | 85–105 HB | 60–80 HB | 45–65 HB | | **Stress Corrosion Threshold** | >200 MPa | >150 MPa | >100 MPa | --- #### **6. Key Characteristics & Advantages** - **Maximum Stress Corrosion Resistance**: Highest SCC resistance in 2218 alloy series - **Superior Dimensional Stability**: Excellent for precision applications - **Enhanced Thermal Stability**: Maintains properties under thermal cycling - **Reduced Residual Stresses**: Minimal internal stresses for critical applications - **Good Machinability**: Predictable machining characteristics - **Long Service Life**: Suitable for extended service in demanding environments - **Reliable Performance**: Proven in critical high-temperature applications --- #### **7. Product Applications** - **Aircraft Engine Components**: Critical engine parts requiring maximum corrosion resistance - **Marine Applications**: Components exposed to saltwater environments - **Chemical Processing**: Equipment for corrosive chemical environments - **Power Generation**: Turbine components and power transmission parts - **Oil and Gas**: Equipment for sour service and corrosive environments - **Precision Instruments**: Components requiring long-term dimensional stability --- #### **8. Available Forms** - Forging Stock - Bar and Rod - Die Forgings - Precision Machined Components - Custom Fabricated Parts --- #### **9. Processing and Quality Features** - **Specialized Aging**: Extended aging cycle to achieve T72 properties - **Stress Relief**: Comprehensive stress relief during processing - **Machining**: Excellent machinability with proper techniques - **Quality Control**: Enhanced testing for stress corrosion resistance - **Certification**: Full traceability and specialized testing available - **Surface Protection**: Compatible with advanced coating systems --- **Disclaimer**: The information presented is typical and for reference only. Actual properties may vary with processing and specific service conditions. For applications requiring maximum stress corrosion resistance, contact our technical service team for specific data and processing recommendations.

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 1610 gallon liquid totes Special package is available on request.