Titanium has many excellent properties: the specific gravity of titanium is 4.5g/cm3, which is only 56% of ordinary structural steel, while its strength is equivalent to or higher than that of ordinary structural steel. Among metal structural materials, titanium has the highest specific strength.
The melting point of titanium is 1668℃, which is slightly higher than that of iron and nickel, and more than 1000℃ higher than that of aluminum and magnesium. Therefore, as a light metal structural material, titanium alloy has much better thermal strength than aluminum and magnesium alloys, and the use temperature is as high as 600℃.
Titanium can easily form a solid oxide film with oxygen on the surface in an oxidizing atmosphere, which makes it have excellent corrosion resistance in oxidizing acid, alkali, and salt media, especially in wet chlorine and seawater.
Titanium has an allotropic crystal structure. Above 885℃, it is the β phase of the close-packed hexagonal lattice, and below it is the α phase of the titanium cubic lattice. Therefore, after adding different alloying elements, titanium alloys can be divided into three categories: α-, β-, and α+β. The allotropy of titanium enables it to obtain alloys with completely different properties and has a large heat treatment effect when adding different alloying elements.
The expansion coefficient of titanium is 8.2×10－6 /℃, which is smaller than that of general structural metals. The stress is small during rapid cooling and rapid heating, and it is suitable for use in environments with temperature changes.
Titanium has good toughness and fatigue resistance, and its welding performance is also very good. Titanium has good low-temperature performance, and does not show low-temperature brittleness at -196℃. These properties are very suitable for structural applications.
Titanium has a low thermal conductivity and is non-magnetic. Some titanium alloys also have superconducting properties, memory properties, and hydrogen storage properties.
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Nicole
Company: Baoji Jimiyun Dynamic Co., Ltd
Country:China
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