Physicochemical Properties Of Tungsten

Tungsten is a steel-gray or silvery-white metal with a melting point as high as 3400℃, making it the metal with the highest melting point. Its boiling point is 5927℃, and its vapor pressure remains very low even at high temperatures of 2000-2500℃. Its density is 19.35 g/cm³, comparable to gold. At high temperatures, the tensile strength of a 0.002 μm diameter tungsten wire is 450 kg/mm². Tungsten has the lowest coefficient of thermal expansion and compressibility among all metals, and its tensile strength at high temperatures exceeds that of any other metal. Tungsten has good electrical and thermal conductivity, a low heat dissipation coefficient, and an electrical conductivity of 18.1 S (Siemens), only one-third that of copper.

Tungsten is classified as a high-melting-point rare metal or refractory rare metal in the fields of metallurgy and metallic materials. Tungsten and its alloys are among the most important functional materials in modern industry, defense, and high-tech applications, widely used in aerospace, nuclear energy, shipbuilding, automotive, electrical, electronics, and chemical industries, among many others.