Hot Vs Cold Rolled Sheet Metal

Once hot rolled steel has cooled it is then re rolled at room temperature to achieve more exact dimensions and better surface qualities.

Hot vs cold rolled sheet metal.

Cold rolled steel is essentially hot rolled steel that has been through further processing. From the point of view of metal the boundary between cold rolling and hot rolling should be distinguished by recrystallization temperature. Hot rolled steel sheets are used in fabrication work where aesthetics and quality are not very important. During the hot rolling process steel is heated to its melting point while being worked changing the composition of the steel to make it more malleable.

Cold rolling steel allows for the creation of very precise shapes. During cold rolling the steel is annealed or exposed to heat and allowed to cool which improves ductility. Cold rolled steel is going to be stronger overall than 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.

Thus the yield strength of cold rolled steel is higher than that of hot rolled steel. The main advantages of cold working are. Each type of steel has its advantages and disadvantages and costs for the two types of steel are also different. As an example a hot rolled steel product may have a yield strength of 235 mpa.

This is important because cold rolled steel is going to be strongest when it s laid with the grain and is significantly weaker against the grain. Cold rolled is a normal temperature hot rolled is a high temperature. For example railway track automotive frames structural frames low accuracy sheet metal parts etc. Hot rolled steel is used in situations where precise shapes and tolerances are not required.

Cold worked steels are typically harder and stronger than standard hot rolled steels. Cold rolled steel is essentially hot rolled steel that has had further processing. It s through a series of breakdown semi finishing sizing semi roughing roughing and finishing that cold rolled steel shapes can be created. To get cold rolled steel manufacturers generally take cooled down hot rolled steel and.

For example consumer electronics and telecom products metal furniture automobile industry etc. Compared to hot rolled steel cold rolled steel has a nearly 20 increase in strength through the use of strain hardening. In comparison a cold rolled steel product with the same chemical composition has a yield strength of 365 mpa. Whereas cold rolled steel sheets are used for precision and quality fabrication work.

Hot rolling and cold rolling are two methods of shaping steel. Hot rolled products like hot rolled steel bars are used in the welding and construction trades to make railroad tracks and i beams for example.