Titanium tubes have plasticity. The elongation of high purity titanium tube can reach 50 ~ 60%, and the section shrinkage can reach 70 ~ 80%. Although the strength of high purity titanium tube is low, the mechanical properties of pure industrial titanium can be significantly enhanced by a small amount of impurities and the addition of alloying elements, so that the strength can be compared with that of high strength. This means that the industrial pure titanium tube, as long as there is a small amount of gap impurities and other metal impurities, can make it has high strength, and appropriate plasticity.
The specific strength (strength to weight ratio) of industrial pure titanium pipe is very high in metal structural materials. Its strength is comparable to steel, but its weight is only 57% of steel. The titanium tube has strong heat resistance, and can still maintain good strength and stability in the atmosphere of 500℃. Titanium tube also has good low temperature resistance, even at -250℃ ultra-low temperature, it still has a high impact strength, can withstand high pressure and vibration. Strong corrosion resistance, this is due to its affinity to oxygen is particularly large, can generate a layer of dense oxide film on its surface, can protect titanium from media corrosion. Therefore, titanium in acid, alkaline, neutral saline solution and oxidation medium has good stability, corrosion resistance than the existing stainless steel and other non-ferrous metals are good.
Titanium tubes are light in weight, high in strength and superior in mechanical properties. It is widely used in heat exchange equipment, such as tube heat exchanger, coil heat exchanger, serpent tube heat exchanger, condenser, evaporator and pipeline, etc.
Titanium alloy is based on the addition of other elements of the alloy. Titanium has two kinds of isomorphic crystals: densely arranged hexagonal α titanium below 882℃, and body-centered cubic β titanium above 882℃. The alloying elements can be divided into three categories according to their effect on phase transition temperature: ① The elements that stabilize α phase and increase phase transition temperature are α-stable elements, including aluminum, carbon, oxygen and nitrogen. Aluminum is the main alloying element of titanium alloy, which has obvious effect on improving the strength of alloy at room temperature and high temperature, reducing specific gravity and increasing elastic modulus. ② The elements that stabilize the β phase and reduce the phase transition temperature are β-stable elements, which can be divided into isomorphous type and eutectoid type. The former has molybdenum, niobium, vanadium and so on; The latter has chromium, manganese, copper, iron, silicon and so on. (3) The elements that have little effect on the temperature of phase transition are neutral elements, such as zirconium and tin.
