What is the difference between black steel and mild steel?

Black steel refers to steel that has not been galvanized or coated, retaining a dark, rough finish due to the presence of iron oxide. It is primarily used in Plumbing and construction. Mild steel, on the other hand, is a type of carbon steel with a low carbon content, making it more ductile and malleable, ideal for welding and forming applications. While both can appear similar, their properties and uses differ significantly due to their composition and treatment.