Titanium is classified into several grades, primarily based on its alloying elements and mechanical properties. Here are some of the key grades and their uses:
1. **Grade 1**: This is the purest form of titanium, offering excellent corrosion resistance, ductility, and formability. It is used in applications like chemical processing, marine environments, and medical devices.
2. **Grade 2**: Known for its balance of strength and ductility, Grade 2 titanium is widely used in industries such as aerospace, automotive, and architecture. It is also used for heat exchangers and desalination plants due to its corrosion resistance.
3. **Grade 3**: This grade offers higher strength than Grades 1 and 2 but with slightly reduced ductility. It is used in applications requiring moderate strength and corrosion resistance, such as in the aerospace and chemical industries.
4. **Grade 4**: The strongest of the pure titanium grades, Grade 4 is used in applications requiring high strength and corrosion resistance, such as in medical implants, aerospace components, and industrial equipment.
5. **Grade 5 (Ti-6Al-4V)**: The most commonly used titanium alloy, Grade 5 offers excellent strength, light weight, and corrosion resistance. It is used extensively in aerospace, medical implants, and high-performance automotive parts.
6. **Grade 7**: Similar to Grade 2 but with added palladium for enhanced corrosion resistance, especially in reducing and oxidizing environments. It is used in chemical processing and marine applications.
7. **Grade 9 (Ti-3Al-2.5V)**: Known for its good weldability and strength, Grade 9 is used in aerospace tubing, sports equipment, and marine applications.
8. **Grade 12**: Contains small amounts of molybdenum and nickel, offering improved corrosion resistance and strength. It is used in chemical processing and marine environments.
9. **Grade 23 (Ti-6Al-4V ELI)**: A variant of Grade 5 with extra low interstitials, providing superior fracture toughness. It is used in medical implants and high-performance aerospace applications.