Here are some commonly used titanium alloy grades, typically classified according to ASTM (American Society for Testing and Materials) standards or other international standards:

Ti-6Al-4V (Grade 5): One of the most common titanium alloys, containing 6% aluminum and 4% vanadium, widely used in aerospace, medical, and engineering fields.

Ti-6Al-4V ELI (Grade 23): Similar to Ti-6Al-4V but with lower oxygen and iron content, making it more suitable for medical implants manufacturing, often referred to as medical-grade titanium.

Ti-3Al-2.5V (Grade 9): Contains 3% aluminum and 2.5% vanadium, exhibiting better weldability compared to Ti-6Al-4V, commonly used in aerospace and marine engineering.

Ti-15V-3Cr-3Al-3Sn (Beta-C): Titanium alloy with β-phase, featuring excellent high-temperature strength and corrosion resistance, used in aerospace and high-temperature applications.

Ti-6Al-2Sn-4Zr-2Mo (Beta-C): With good strength and toughness, suitable for aerospace, shipping, and chemical equipment.

Ti-5Al-2.5Sn (6-2-4-2): Contains 5% aluminum and 2.5% tin, suitable for applications with high-temperature, high-pressure, and high-strength requirements.

Ti-6Al-6V-2Sn (Beta-C): High-aluminum titanium alloy with excellent high-temperature strength and toughness, suitable for aerospace engine components.

Ti-8Al-1Mo-1V (Alpha-Beta): With high strength, low density, and good high-temperature performance, widely used in aerospace and military applications.

CP Ti (Commercially Pure Titanium): Commercially pure titanium, divided into various grades such as Gr1, Gr2, Gr3, etc., used for general engineering and medical applications.

These grades cover different types of titanium alloys, each with specific properties and suitable applications. When selecting titanium alloys, specific application needs and performance requirements should be considered to determine the most suitable grade.