Difference Between Hot Rolled And Cold Rolled Steel Sheet

This lack of knowledge concerning the two types of steel is more common than you would think.

Difference between hot rolled and cold rolled steel sheet.

Whereas cold rolled steel is processed in cold reduction mills followed by annealing and tempering. In hot rolled steel final rolling is done when the steel is hot. As you might suspect the manufacturing process behind cold rolled steel is a bit different. In size as well the hot rolled and the cold rolled steel are different.

In comparison a cold rolled steel product with the same chemical composition has a yield strength of 365 mpa. Hot rolled steel involves rolling the steel above re crystallization temperatures. On the other hand the cold rolled steel comes with a shiny blue grey surface and square corners. One important difference to understand is hot rolled steel and cold rolled steel.

Compared to hot rolled steel cold rolled steel has a nearly 20 increase in strength through the use of strain hardening. Cold rolled steel is essentially hot rolled steel that has had further processing. Hot rolling is a mill process which involves rolling the steel at a high temperature typically at a. Difference between hot rolled steel and cold rolled steel hot rolled steel.

Both hot rolled steel and cold rolled steel start out in essentially the same way and both can have the same grades and specifications. But cold rolled steel undergoes additional processing steps resulting in improved properties that can be exploited for different applications. As an example a hot rolled steel product may have a yield strength of 235 mpa. The hot rolled steel comes with a rough blue grey finish and rounded corners.

The main advantages of cold working are. Basic difference between hot rolled and cold rolled steel is the way they are processed. Hot rolled steel is more malleable allowing it to be forced into a variety of different shapes. In terms of finishing as well both the hot rolled steel and the cold rolled steel are different.

Despite the name this process refers to steel that is pressed with the pressure of a roller at room temperature. The difference is not in their specifications or grade but in how they are processed at a mill. Cold rolled steel has an oily or greasy finish very smooth surface and very sharp edges. This makes hot rolled steel a good choice for the manufacturing of structural components such as i beams or simple cross sections such as rail tracks.

Hot rolled steel has a rough blue grey finish whereas cold rolled steel has a smooth grey finish. Thus the yield strength of cold rolled steel is higher than that of hot rolled steel. It is also used to produce sheet metal. In cold rolled steel final rolling is done when the steel is cooled to the room temperature.

Hot rolled steel comes with a scaly surface slightly rounded edges and corners and the surface is non oily.