Tungsten is a silver-gray metal. The atomic weight is 183.85. Electronic structure 4f145d46s2. Density (20℃) 19.3g/cm3. Melting point 3400℃. Boiling point 5555℃. Tungsten forms a solid solution with iron and two intermetallic compounds Fe2W and Fe3W2 or Fe7W6, but they are unstable at high temperatures. The melting temperature of ferrotungsten containing 75% to 85% W is higher than 2500°C, so it cannot be discharged from the furnace and can only be produced by the accumulation method or the iron extraction method. The density of industrial ferrotungsten is about 15.3g/cm.
FeW alloy
An iron alloy whose main components are tungsten and iron. It also contains manganese, silicon, carbon, phosphorus, sulfur, copper, tin and other impurities, and is an alloying agent used in steelmaking. According to the different tungsten content, ferrotungsten is divided into: FeW75 (containing W70% ~ 80%, C ≤ 0.20%, P ≤ 0.04%, S ≤ 0.08%, Si ≤ 0.5%, Mn ≤ 0.25%) and FeW80 (containing W75.0%～85.0%, C≤0.20%, P≤O.04%, S≤0.08%, Si≤0.7% and Mn≤0.25%).
