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Difference Between Hot Rolled and Cold Rolled Steel Coil



There are many customers often ask us a question about the differences between hot rolled steel coil and cold rolled steel coil. Today we will have a discussion about that.


The hot rolled steel coil and the cold-rolled steel coil, they only have one difference in the word. So what’s the difference between hot rolled steel coil and cold rolled steel coil?


There are some primary differences between these two types of steel coil. These differences are related to the ways they are manufactured or something about the manufacturing technique. The difference between hot rolled steel coil and cold rolled steel coil is not about the product specification or grade.



Introduction of Hot-Rolled steel Coil


Before the introduction of hot rolled steel coil, I want to introduce hot rolling, the manufacturing technique of hot rolled steel coil to you.


Hot rolling is a metalworking process in which metal is heated above the recrystallization temperature to plastically deform it in the working or rolling operation.


Hot rolling is a process used to create shapes with the desired geometrical dimensions and material properties while maintaining the same volume of metal. The hot metal is passed through the two rolls to flatten, lengthen, reduced the cross-sectional area, and obtained a uniform thickness.


Hot rolling can improve the performances of the metal, such as toughness and strength, ductility, resistance to vibration and shock, formability, weldability.



Introduction of Cold-Rolled Steel Coil


Cold rolling is a process by which the sheet metal or strip stock is introduced between rollers and then compressed and squeezed. The amount of strain introduced determines the hardness and other material properties of the finished product.


The advantages of cold rolling are good dimensional accuracy and surface finish.


Cold rolled steel is processed further in cold reduction mills, where the material is cooled followed by annealing and/or tempers rolling. The cold reduction process will produce steel with closer dimensional tolerances and a wider range of surface finishes. The term cold rolled is mistakenly used on all products, when actually the product name refers to the rolling of flat-rolled sheet and coil products.


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