As an example a hot rolled steel product may have a yield strength of 235 mpa.
Difference between hot rolled and cold rolled sheet metal.
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.
The major d ifference between hot rolled and cold rolled steel is the way they are processed.
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.
Cold rolled steel is stored and sold in coiled form after rolling.
There are three main visual differences between the two processes.
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.
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.
Hot rolled steel has rounded edges a rough surface texture and no grease on its finish.
The various types mean that steel can by widely used in infrastructure appliances vehicles wind turbines and many more applications.
Compared to hot rolled steel cold rolled steel has a nearly 20 increase in strength through the use of strain hardening.
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.
In hot rolled steel final rolling is done when the steel is hot.
Alternatively cold rolled steel has sharp edges a very smooth surface texture and an oily or greasy feel to it.
In cold rolled steel final rolling is done when the steel is cooled to the room temperature.
The difference between cold rolling and hot rolling are mainly the temperature of the rolling process.
At this high temperature they are easily flattened into a long sheet using a set of rollers and then wound up into large coils.
The debate between hot rolled vs cold rolled steel persists to determine which process is the more desirable.
Thus the yield strength of cold rolled steel is higher than that of hot rolled steel.
Cold rolled is a normal temperature hot rolled is a high temperature.
Hot rolled steel has a rough blue grey finish whereas cold rolled steel has a smooth grey finish.
Whereas cold rolled steel is processed in cold reduction mills followed by annealing and tempering.
What is the difference between hot rolled and cold rolled steel.
In comparison a cold rolled steel product with the same chemical composition has a yield strength of 365 mpa.
The billets are then heated eventually reaching over 1700 f.
The rolls induce plastic deformation.
