The physical and chemical properties of tungsten and tungsten alloy products

Tungsten, element symbol W, appears silver white. Many physical properties of tungsten are unique among all metals. For example, the density of tungsten (19.3 g/cm ³) is very high, close to that of gold; The hardness of tungsten is also very high, such as the hardness of tungsten carbide, which is close to that of diamond; Its melting point of 3410 ° C is the highest among all metals, and its vapor pressure and evaporation rate are the lowest among all metals. Its coefficient of linear expansion changes the least with increasing temperature in the refractory metal family. In addition, tungsten also has good electrical and thermal conductivity, and all of its outstanding properties have opened up a wide range of important application areas for tungsten in various engineering fields.