Half of tungsten, in many steel alloys, molybdenum can effectively replace tungsten, thus initiating its industrial application. In 1900, people successfully studied the production process of ferromolybdenum and discovered that molybdenum steel can meet the special properties required for gun steel materials, leading to the rapid development of molybdenum steel production in 1910. Since then, molybdenum has become an important component of various heat-resistant and corrosion-resistant structural steels, as well as nickel and chromium alloys The industrial production of metal molybdenum and its widespread application in the electrical industry began around the same era as metal tungsten (1909). This is because the powder metallurgy method and pressure processing technology for producing these two dense metals have been successfully studied and can be fully applied to production. Another reason is the outbreak of World War I, which led to a sharp increase in demand for tungsten and an extreme shortage of tungsten iron supply, This led to molybdenum replacing tungsten in many high hardness and impact resistant steels. As a result, the increase in demand for molybdenum led to a further increase in demand. At this time, the large mine Climax molybdenum mine in Colorado, USA, was developed and put into operation in 1918 The end of World War I led to a sharp decrease in demand for molybdenum. In order to solve this problem, people began to develop applications of molybdenum in civil industry, and soon many of them were used in automotive industry