Tungsten is the refractory metal with the highest melting point. Generally, metals with melting point higher than 1650 centigrade and certain reserves and metals with melting point higher than Zirconium melting point (1852 ℃) are called refractory metals. Typical refractory metals are tungsten, tantalum, Molybdenum, Niobium, Hafnium, Chromium, Vanadium, Zirconium and Titanium. As a refractory metal, the most important advantage of tungsten is that it has good high-temperature strength and good corrosion resistance to molten alkali metals and steam. Tungsten has oxide volatilization and liquid oxide only above 1000 centigrade. At the same time, it also has the disadvantages of high plastic brittle transition temperature and difficult plastic processing at room temperature. Refractory metals represented by tungsten have been widely used in metallurgy, chemical industry, electronics, light source, machinery industry and other departments.
Wolframite (Mn,Fe)WO4 ore found in nature
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