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Which titanium alloys are used where very high tensile strength is needed?

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A periodic table element tile for titanium displays its atomic number 22, symbol Ti, atomic weight 47.867, electron configuration, and name. Icons indicate it is a solid, transition metal with a hexagonal crystal structure and equal relative strength. — titanium Properties of titanium.

Titanium alloys are categorized into four classes based on their phase composition at room temperature: commercially pure, alpha, alpha-beta, and beta. Among these, beta alloys are specifically utilized in applications where very high tensile strength is required.1

Additionally, specific high-strength alloys are employed for their mechanical properties and corrosion resistance in demanding environments:

Ti–3Al–8V–6Cr–4Mo–4Zr: This is noted as an even stronger alloy that provides excellent resistance to high-temperature sour gas, making it suitable for energy extraction applications such as downhole tubing, casings, and instrumentation.2
Ti–6Al–4V: While widely recognized for its versatility and use in medical prostheses, this alloy is also a significant high-strength material developed for the aerospace industry.2

These alloys leverage the unique properties of titanium—such as its high strength-to-weight ratio and corrosion resistance—to perform effectively in critical structural and industrial roles.1342