What are the rare metals in everyday life?

Rare metals are usually those metals that are rare in nature, dispersed or difficult to extract from raw materials. The following metals are usually considered rare: lithium, rubidium, caesium, beryllium, tungsten, molybdenum, tantalum, niobium, titanium, zirconium, hafnium, vanadium, rhenium, gallium, indium, thallium, germanium, scandium, yttrium, lanthanum, cerium, praseodymium, neodymium, promethium and neodymium. In order to study the convenience, according to a variety of rare metals have some common points (such as the physical and chemical properties of the metal, the symbiotic relationship of raw materials, production processes, etc.). , is divided into the following five categories: 1) rare light metals; 2) rare high melting point metals; 3) rare dispersion metals; 4) rare earth metals; 5) rare radioactive metals. Rare metals are commonly used in the metallurgical industry to manufacture special steels, super-hard alloys and high-temperature resistant alloys. The names of rare metals are also somewhat relative. Not all rare metals are rare. Many rare metals are much larger than ordinary metals in the earth's crust, such as zirconium, vanadium, lithium and beryllium, which are larger than lead, zinc, mercury and tin. As technology advances, the boundaries between them and common metals are disappearing.