Both cold rolled and hot rolled steel start out as large steel slabs or billets cast from hot liquid metal.
Difference between hot rolled and cold rolled sheet metal.
When to use hot rolled steel.
What is the difference between hot rolled and cold rolled steel.
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.
Hot rolled steel involves rolling the steel sheets above re crystallization temperatures.
As an example a hot rolled steel product may have a yield strength of 235 mpa.
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.
To know various materials used to manufacture sheet metal parts.
Cold rolled is a normal temperature hot rolled is a high temperature.
Compared to hot rolled steel cold rolled steel has a nearly 20 increase in strength through the use of strain hardening.
Alternatively cold rolled steel has sharp edges a very smooth surface texture and an oily or greasy feel to it.
From the point of view of metal the boundary between cold rolling and hot rolling should be distinguished by recrystallization temperature.
In comparison a cold rolled steel product with the same chemical composition has a yield strength of 365 mpa.
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.
Thus the yield strength of cold rolled steel is higher than that of hot rolled steel.
Hot rolled steel has a rough blue grey finish whereas cold rolled steel has a smooth grey finish.
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.
The rolls induce plastic deformation.
There are three main visual differences between the two processes.
Hot rolled steel has rounded edges a rough surface texture and no grease on its finish.
Whereas cold rolled steel is processed in cold reduction mills followed by annealing and tempering.
At this high temperature they are easily flattened into a long sheet using a set of rollers and then wound up into large coils.
In hot rolled steel final rolling is done when the steel is hot.
The debate between hot rolled vs cold rolled steel persists to determine which process is the more desirable.
The various types mean that steel can by widely used in infrastructure appliances vehicles wind turbines and many more applications.
In cold rolled steel final rolling is done when the steel is cooled to the room temperature.
The major d ifference between hot rolled and cold rolled steel is the way they are processed.
