Why is it important for steel to go through a fluid phase as it is being produced?

It is important for steel to go through a fluid phase during production because it allows for better mixing of alloying elements, such as carbon and manganese, leading to a more uniform composition and improved mechanical properties. The fluid phase also helps remove impurities and gases trapped in the solid steel, resulting in a cleaner final product. Additionally, the fluidity of the steel enables it to be easily shaped and molded into the desired form through casting or rolling processes.