Steel products form a very important part of our daily lives, and we certainly cannot fathom living without many of them. From the steel products used to make a vehicle to the steel finish on our appliances, steel is almost everywhere. The manner in which the steel used in these and other products was made will largely determine which type of steel is used for various end products.
Most steel products we have start off in large steel sheets or long rolled coils. These steel pieces are then further machined or manufactured to make the products we use every day. The steel can either be formed into hot rolled sheet or coiled rolled sheet depending on the process used when making the steel.
The hot rolled steel process involves heating the raw material to extreme temperatures that actually changes the properties of the steel. These temperatures ensure that the material is above its recrystallization temperature during the entire manufacturing process to allow the steel to be manipulated and machined into hot rolled steel. The steel can either be made into large hot rolled sheets or into hot rolled coils with various grades and strengths. The grade of the hot rolled sheet is dependent on the raw materials or alloys used in the process. Hot rolled sheets are further machined into numerous structural steel items such as scaffolding, bridges and so forth.
Cold rolled sheet is also heated during the manufacturing process, but not as greatly as hot rolled sheet. The materials used to make the steel must not be heated above the recrystallization temperature during the cold rolled sheet manufacturing process. Cold rolled sheet has a much cleaner finish than hot rolled sheet and can undergo additional processes such as galvanisation and painting directly after the steel sheets have been formed. This makes cold rolled sheet ideal for the exterior of automobiles and appliances because of its smooth and clean finish.