The refractory heavy metal tungsten as a material is used in various industries. It can be used as an alloying element in heat-resistant steels and in its pure form as a lamp filament. Its main advantages are its high melting point and minimal thermal coefficient of linear expansion. It is widely used in metallurgy to alloy tool steels and armor alloys because of its refractory properties. Because tungsten's melting point is 3387-3422°C, it is used in the manufacture of filaments for lamps and electron-beam tubes. This metal serves as the basis for a number of semi-finished products, such as:
Tungsten does not react with any chemicals in a normal environment. It is identical in density to gold - respectively: 19.30 g/cm³ versus 19.32 g/cm³.
Stellite, beater, and other tungsten alloys are characterized by high hardness. It is this quality that has been the main reason for their use in the manufacture of cutting tools. Such alloys also have excellent resistance to wear, corrosion and cavitation resistance.
|Physical properties of W|
|Temperature at which the above properties were obtained t°C||20°С|
|Coefficient of linear thermal expansion α [1/Grad]||43x10-6|
|Alloy density [g/cm3] 19.3||19,3|
|Tensile strength kg/mm2||35|
|Specific heat capacity at 20 °C [kJ/(kg-grad)]||0,134|
|Thermal conductivity K [W/(m-K)||300,173|
|Specific electrical resistance R Ohmxmm2/m||0,054|
Tungsten is a rare element of the Earth's lithosphere. In ordinary conditions it is very heavy, hard, not enough plastic. The difficulty of obtaining it in its pure form is rather high, the processing due to its unique properties has an impact on the final cost of the products.
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