Hot rolled coil is steel that has been rolled-pressed at high temperatures of 900º degrees. This makes the steel easier to mold and results in products that are easier to work with.
To create hot rolled steel, manufacturers begin the process with a large rectangular piece of metal called a billet. The billet is heated and flattened into a large roll from there its state is maintained at high temperatures and run through a series of rollers to achieve the initial shape. The white-hot strands of steel are run through the rollers at high speeds to create sheet metal. Hot rolled steel is spun into coils and left to cool to create plates, bars, and other products.
Once the sheet has cooled down it shrinks. However, in this method of manufacturing, it is allowed to do so without controlling the final shape. This makes the resulting steel less suitable for precision applications. The hot rolled steel coil is often used in applications where minutely specific dimensions are not crucial such as railroad tracks and construction projects. Hot-rolled coils require comparatively less processing than cold rolled coils, which makes it cheaper. The hot-rolled coils are cooled at room temperature, which normalizes the metal.
Hot rolled steel coils are ideal where accurate dimensions, shapes, or surface finishing is not as important compared to material strength. However, if surface finishing is required it can be done with sandblasting, grinding, or acid bath pickling. To neutralize surface oxides the hot rolled steel coils are passed through an acidic solution and subsequently oiling the surface to make it corrosion-resistant.
Some of hot rolled coil's features include: