Titanium Grade 18, also known as Ti-3Al-2.5V-Ru, is a titanium alloy that includes ruthenium (Ru) as an alloying element. This grade is known for its enhanced strength, corrosion resistance, and stability at elevated temperatures. Here are the key characteristics and potential applications of Grade 18 Titanium:

Ⅰ. Key Characteristics

① Composition: Alloyed with 3% aluminum, 2.5% vanadium, and ruthenium (Ru).

② Strength: High tensile and yield strength, significantly stronger than commercially pure titanium grades.

③ Corrosion Resistance: Excellent resistance to corrosion in various environments, including seawater, acids, and high-temperature oxidizing atmospheres, enhanced by the addition of ruthenium.

④ Heat Resistance: Maintains mechanical properties at elevated temperatures, suitable for applications requiring heat resistance.

⑤ Weldability: Good weldability, suitable for various fabrication processes.

⑥ Ductility: Good ductility, allowing for ease of forming and shaping.

⑦ Biocompatibility: Non-toxic and biocompatible, suitable for medical applications with appropriate surface treatments.

Ⅱ. Potential Applications

① Aerospace: Used in aircraft components such as airframes, landing gear, and engine parts due to its high strength-to-weight ratio and heat resistance.

② Marine: Ideal for marine applications, including seawater piping, fittings, and offshore structures, due to its corrosion resistance.

③ Chemical Processing: Suitable for chemical processing equipment, including reactors, heat exchangers, and piping systems where corrosion resistance to acids and chlorides is critical.

④ Medical: Used in medical implants and devices where high strength, corrosion resistance, and biocompatibility are essential.

⑤ Industrial: Utilized in various industrial applications requiring high strength and corrosion resistance, such as power generation, oil and gas industry components, and desalination plants.

Ⅲ. Physical and Mechanical Properties

① Density: Approximately 4.51 g/cm³

② Tensile Strength: Typically around 1000 MPa (145 ksi)

③ Yield Strength: Approximately 900 MPa (130 ksi)

④ Elongation: About 10-15% in 2 inches

⑤ Modulus of Elasticity: 110 GPa (16 Msi)

Grade 18 Titanium (Ti-3Al-2.5V-Ru) is an advanced titanium alloy suited for demanding applications where a combination of high strength, corrosion resistance, heat resistance, and stability at elevated temperatures is required. Its use is specialized and typically found in industries requiring high-performance materials capable of withstanding extreme conditions.