Whats the difference between TA18 titanium alloy tubes and TC4 titanium tubes?

What's the difference between TA18 titanium alloy tubes and TC4 titanium tubes?

1.Different Compositions: Titanium alloy TA18 is a near - α titanium alloy, while TC4 is an (α + β) titanium alloy.

2.Differences in Performance: The welding performance and cold - forming performance of TA18 titanium alloy tubes are better than those of TC4, while TC4 has better comprehensive mechanical properties.

3.Different Uses: TA18 titanium alloy tubes are suitable for making high - pressure - resistant and lightweight conduits on airplanes. TC4 titanium tubes have a wider range of applications and can be used for landing - gear wheels and structural components, fasteners, brackets, airplane accessories, frames, stringer structures, and pipelines.

Titanium alloy TA18 is a near - α titanium alloy with a composition of Ti - 3Al - 2.5V. Its welding performance and cold - forming performance are better than those of TC4. It has a density of 4.47 g/cubic centimeter, a room - temperature elastic modulus of 118 - 123 GPa, a phase - transformation point of 925 °C, and a hardness of 15 - 17 HRC.

TC4 has a composition of Ti - 6Al - 4V and is a heat - treatment - strengthened titanium alloy. It has good weldability, thin - plate formability, and forging performance. It is used to manufacture jet - engine compressor blades, impellers, etc. It is also used for other components such as landing - gear wheels and structural components, fasteners, brackets, airplane accessories, frames, stringer structures, and pipelines and is very widely applied.

In general, the TA18 alloy is a low - alloyed near - α titanium alloy. This alloy has good cold - formability and welding performance. Its room - temperature strength is 20% - 50% higher than that of commercially pure titanium and it has good corrosion resistance in many media. Therefore, with its excellent comprehensive performance, the TA18 alloy has become an ideal material for making high - pressure - resistant and lightweight conduits on airplanes. The TC4 titanium alloy belongs to the (α + β) - type titanium alloy and has a series of advantages such as excellent corrosion resistance, low density, high specific strength, good toughness, and weldability. It has been successfully applied in aerospace, petrochemical, shipbuilding, automobile, medicine, and other sectors.