Tungsten properties

Silvery white tungsten having a melting point of up to 3400 deg.] C, the highest melting point metal. The density was 19.3 g/cm3. 2.5 times that of steel is equivalent to gold. Preferably the conductive tungsten, which is higher in conductivity than nickel, iron, phosphor bronze and platinum. Tungsten has a small expansion coefficient. Tungsten is relatively stable at normal temperature, and when the temperature is not high, a brown and dark blue oxide film is formed on the surface, and at a higher temperature, oxidation is intense to form tungsten trioxide. When it exceeds 2000 ° C, tungsten and nitrogen react to form tungsten nitride. Tungsten and hydrogen do not work. At high temperatures, tungsten reacts with carbon and some carbonaceous gases to form hard, refractory carbides of important industrial value. Tungsten has good corrosion resistance and does not work with any concentration of acid and alkali at room temperature, but it can be quickly dissolved in a mixture of hydroquinic acid and concentrated nitric acid. It will be in oxidative molten salt (such as sodium nitrate). Severe corrosion. The main minerals are black tungsten ore and scheelite .

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