The main raw materials of steel are iron ore and coke. Among them, iron ore is the most important raw material, and coke is an important reducing substance in the process of steel processing, which needs a lot. Therefore, in the process of steel manufacturing, iron ore and coke are the most important raw materials, and their prices are also the most important factors affecting steel prices. Iron ore needs to be made into iron concentrate before processing, on the one hand, because iron concentrate is easy to transport, small in size and relatively low in transportation cost, on the other hand, because iron ore processed into iron concentrate is easier to burn in blast furnace. Coke is added to iron concentrate at high temperature in the furnace, and then it is smelted into molten iron, which becomes the most basic pig iron, and then the most basic crude steel is obtained through combustion and casting. If further processing is needed, it is necessary to enter the subsequent process. Basically, this is how steel is made.