Difference Between Hot And Cold Sheet Steel

Hot rolled steel sheets are used in fabrication work where aesthetics and quality are not very important.

Difference between hot and cold sheet steel. Whereas cold rolled steel sheets are used for precision and quality fabrication work. Cold rolled steel is essentially hot rolled steel that has had further processing. In cold rolled steel final rolling is done when the steel is cooled to the room temperature. For example railway track automotive frames structural frames low accuracy sheet metal parts etc.

Thus the yield strength of cold rolled steel is higher than that of hot rolled steel. Hot rolled steel comes with a scaly surface slightly rounded edges and corners and the surface is non oily. Hot rolling is a mill process which involves rolling the steel at a high temperature typically at a. This lack of knowledge concerning the two types of steel is more common than you would think.

One important difference to understand is hot rolled steel and cold rolled steel. Hot rolled steel is rolled or shaped at a high temperature while cold rolled steel is rolled at room temperature. In other words understanding the differences between hot and cold rolled steel will help designers and engineers achieve better results and at the best price possible. It s through a series of breakdown semi finishing sizing semi roughing roughing and finishing that cold rolled steel shapes can be created.

Cold rolling steel allows for the creation of very precise shapes. When you choose metals for a job it s important you know how the hot rolled and cold rolled steel are different. Cold rolling is done when the metal is able to form new grains as the old ones are deformed by rolling and bending the metal. In hot rolled steel final rolling is done when the steel is hot.

For example consumer electronics and telecom products metal furniture automobile industry etc. Cold rolled has a smooth and shiny finish while hot rolled has a grey and scaly finish. Cold rolled steel has an oily or greasy finish very smooth surface and very sharp edges. Difference between hot rolled steel and cold rolled steel hot rolled steel.

Cold rolled has sharper corners and more precise dimensions than hot rolled. Compared to hot rolled steel cold rolled steel has a nearly 20 increase in strength through the use of strain hardening. The difference is not in their specifications or grade but in how they are processed at a mill. In comparison a cold rolled steel product with the same chemical composition has a yield strength of 365 mpa.

The rolls induce plastic deformation. As an example a hot rolled steel product may have a yield strength of 235 mpa. Hot rolled steel has a rough blue grey finish whereas cold rolled steel has a smooth grey finish.