Difference Between Hot Rolled And Cold Rolled Sheet Metal

Hot rolled steel involves rolling the steel sheets above re crystallization temperatures.

Difference between hot rolled and cold rolled sheet metal. The debate between hot rolled vs cold rolled steel persists to determine which process is the more desirable. Cold rolled is a normal temperature hot rolled is a high temperature. The difference between cold rolling and hot rolling are mainly the temperature of the rolling process. The billets are then heated eventually reaching over 1700 f.

Hot rolled steel has a rough blue grey finish whereas cold rolled steel has a smooth grey finish. Simply put rolling is a metal fabrication process that involves the formation of molten metals or other kinds of materials into products such as sheets wires bars and the like. Thus the yield strength of cold rolled steel is higher than that of hot rolled steel. In cold rolled steel final rolling is done when the steel is cooled to the room temperature.

Steel comes in many grades specifications shapes and finishes the world steel association lists over 3 500 different grades of steel each with unique properties. To know various materials used to manufacture sheet metal parts. The differences between hot rolled steel and cold rolled steel relates to the way these metals are processed at the mill and not the product specification or grade. Alternatively cold rolled steel has sharp edges a very smooth surface texture and an oily or greasy feel to it.

Hot rolled steel has rounded edges a rough surface texture and no grease on its finish. It s through a series of breakdown semi finishing sizing semi roughing roughing and finishing that cold rolled steel shapes can be created. From the point of view of metal the boundary between cold rolling and hot rolling should be distinguished by recrystallization temperature. Both cold rolled and hot rolled steel start out as large steel slabs or billets cast from hot liquid metal.

There are three main visual differences between the two processes. Compared to hot rolled steel cold rolled steel has a nearly 20 increase in strength through the use of strain hardening. When to use hot rolled steel. The major d ifference between hot rolled and cold rolled steel is the way they are processed.

In hot rolled steel final rolling is done when the steel is hot. The various types mean that steel can by widely used in infrastructure appliances vehicles wind turbines and many more applications. The rolls induce plastic deformation. Whereas cold rolled steel is processed in cold reduction mills followed by annealing and tempering.

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 at high temperatures where cold rolled steel is processed further in cold reduction mills where the material is cooled followed by. Cold rolled steel is stored and sold in coiled form after rolling.