From a million years ago, the primitive people to stone as a tool, called the Paleolithic era. Thousands of years ago, mankind processed stone tools to make them into vessels and elaborate tools, thus entering the Neolithic Age. Archeological excavations now prove that our country was made more than eight thousand years ago with practical pottery, and brass was smelted more than 6,000 years ago. There were already simple bronze tools over 4000 years ago. Over 3,000 years ago Use meteorite to make weapons. Our ancestors smelted pig iron in the spring and autumn of more than 2500 years ago, more than a thousand and eighty years earlier than in Europe. In the 18th century, the development of the steel industry became an important content and material basis for the industrial revolution. The mid-19th century, modern flat furnace and converter nickel tube steelmaking technology, so that people really entered the steel age. At the same time, copper, lead and zinc have also been applied in large quantities. Metals such as aluminum, magnesium and titanium have come out and been applied one after another. To date, metal materials have dominated the material industry. It can be said that the metal material is the full-scale witness to the development of human society. It is inseparable from the pivotal role he played in various transitional periods of human society. As one of the earliest discovered and started to be used by mankind, metal can be said to affect human history in all aspects. From the initial metal hunting weapon to the human life now can not be separated from the metal, showing the metal has long been integrated into the entire human society.
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