The Top 10 Properties of Titanium

　　1. Low density, high specific strength: The density of metallic titanium is 4.51 g/cm³—higher than aluminum but lower than steel, copper, and nickel—but its specific strength ranks first among metals.
　　II. Corrosion Resistance Performance
　　Titanium is a highly reactive metal with a very low equilibrium potential, making it thermodynamically prone to corrosion in various media. However, in practice, titanium exhibits remarkable stability in many environments—for instance, it is highly resistant to corrosion in oxidizing, neutral, and mildly reducing media. This exceptional resistance stems from titanium's strong affinity for oxygen: when exposed to air or oxygen-containing environments, a dense, tightly adherent, and remarkably inert oxide film forms rapidly on the surface of the metal. This protective layer effectively shields the underlying titanium matrix from further corrosion. Even if mechanically damaged through wear, the oxide film can swiftly self-heal or regenerate itself. This unique behavior underscores titanium's inherent tendency toward passive protection. Notably, at temperatures below 315°C, the oxide film on titanium consistently maintains these outstanding protective properties.
　　To enhance the corrosion resistance of titanium, researchers have developed various surface treatment techniques, including oxidation, electroplating, plasma spraying, ion nitriding, ion implantation, and laser treatment. These methods effectively strengthen the protective oxide layer on titanium, delivering the desired level of corrosion resistance. Specifically tailored for applications involving metallic materials in harsh environments such as sulfuric acid, hydrochloric acid, methylamine solutions, high-temperature wet chlorine gas, and high-temperature chlorides, a series of corrosion-resistant titanium alloys have been developed, including titanium-molybdenum, titanium-palladium, and titanium-molybdenum-nickel alloys. For titanium castings, the Ti-32Mo alloy has proven highly effective, while the Ti-0.3Mo-0.8Ni alloy is ideal for environments prone to crevice or pitting corrosion. Additionally, localized applications of the Ti-0.2Pd alloy on titanium equipment have also yielded excellent performance results.
　　3. Excellent Heat Resistance
　　The new titanium alloy can be used continuously at temperatures of 600°C or higher.
　　4. Excellent Low-Temperature Performance
　　Low-temperature titanium alloys, such as TA7 (Ti-5Al-2.5Sn), TC4 (Ti-6Al-4V), and Ti-2.5Zr-1.5Mo, exhibit increased strength as the temperature decreases, while their ductility remains relatively stable. These alloys maintain excellent ductility and toughness even at extremely low temperatures ranging from -196°C to -253°C, effectively preventing brittle fracture—a common issue with metals at cryogenic conditions. As a result, they are ideal materials for applications like cryogenic vessels and storage tanks.
　　5. Strong Damping Resistance
　　When subjected to mechanical or electrical vibrations, metallic titanium exhibits the longest vibration decay time compared to steel and copper. This unique property of titanium makes it ideal for applications such as tuning forks, vibration components in medical ultrasonic crushers, and vibrating diaphragms used in high-end audio speakers.
　　6. Non-magnetic, non-toxic
　　Titanium is a non-magnetic metal that remains unmagnetized even in strong magnetic fields. It is non-toxic and exhibits excellent biocompatibility with both human tissues and blood, which is why it has been adopted by the medical community.
　　7. The tensile strength is close to its yield strength.
　　This property of titanium highlights its high strength-to-yield ratio (tensile strength/yield strength), indicating that titanium metal exhibits poor plastic deformation during forming. Additionally, because the yield strength of titanium is significantly higher relative to its elastic modulus, it results in a greater springback capability when titanium is shaped.
　　8. Excellent Heat Exchange Performance
　　Although titanium has a lower thermal conductivity compared to carbon steel and copper, its outstanding corrosion resistance allows for significantly thinner wall thicknesses. Additionally, the heat transfer between the surface and steam occurs via droplet condensation, which minimizes thermal resistance. Moreover, since the titanium surface remains free of fouling, it further reduces thermal resistance, thereby enhancing titanium's overall heat-transfer performance considerably.
　　9. Low Elastic Modulus
　　Titanium's elastic modulus at room temperature is 106.4 GPa, which is 57% of that of steel.
　　10. Air Intake Performance
　　Titanium is a chemically highly reactive metal that can react with many elements and compounds at high temperatures. Titanium gas absorption primarily refers to its reactions with carbon, hydrogen, nitrogen, and oxygen under elevated temperatures.