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The Difference Between Hot Rolled And Cold Rolled Steel

Jan. 26, 2022

The main difference between hot rolled steel and cold rolled steel is the way they are processed. Hot rolled steel is steel that has been rolled at high temperatures, while cold rolled steel is essentially hot rolled steel that has been further processed in a cold rolled material. Here, the material is cooled and then annealed and/or tempered and rolled. Different grades and sizes of steel can be hot-rolled or cold-rolled. Understanding the differences between hot-rolled and cold-rolled steel can help you determine the type that best suits your needs.

 

Hot Rolled Steel

Hot rolling is the process used to make hot-rolled steel and involves rolling the steel at high temperatures, usually over 1700°F. These high temperatures are above the recrystallization temperature of the steel. These high temperatures are above the steel's recrystallization temperature, making the steel easy to shape, form and manufacture into larger sizes. As it cools, hot-rolled steel tends to shrink unevenly, providing less control over the size and shape of the finished product than cold-rolled steel.

Hot-dip galvanized steel coil can be obtained with a pure zinc coating by the hot-dip galvanizing process. It combines the economy, strength and formability of steel with the corrosion resistance of zinc. The hot dip process is a process of applying a zinc coating to steel to prevent rusting. It is particularly useful for a myriad of outdoor and industrial applications.


Characteristics of hot-rolled steel

Hot rolled steel tends to have a scaly surface that can be removed by pickling, grinding or sandblasting. This steel is essentially normalized, which means there are no internal stresses due to quenching or work-hardening processes, as it can be cooled at room temperature. Other properties may include

Hot-Dipped Galvanized Steel Coil

 Hot-Dipped Galvanized Steel Coil

 

Slightly rounded edges and corners of the plate product (due to shrinkage and less precise finishing)

Slight deformation

More ductile and can be turned into a variety of shapes

Increased ductility and toughness

Advantages of hot-rolled steel

Hot-rolled steel tends to be cheaper than cold-rolled steel because it is manufactured without any delay and does not require reheating as cold-rolled steel does. It is also largely normalized because it can be cooled at room temperature; this means that it has no internal stresses due to quenching or work-hardening processes.

 

Applications of hot-rolled steel

Hot rolled steel tends to be cheaper than cold rolled steel because it is manufactured without any delay and does not need to be reheated as cold rolled steel does. It can be used in applications where precise shapes and tolerances are not required, such as

 

Structural components (railroad tracks, I-beams, sheet metal)

Agricultural equipment

Metal construction

Stamped parts

Automotive frames


Cold Rolled Steel Coils

 Cold Rolled Steel Coils

Cold Rolled Steel

Cold-rolled steel is essentially hot-rolled steel that is further processed by cooling and annealing or temper rolling at room temperature. Cold-rolled steel is produced with tighter dimensional tolerances and a wider range of surface finishes than hot-rolled. It is also 20% stronger than hot-rolled through the use of strength hardening. 

The raw material for cold rolled steel coils is a high quality hot rolled product that has been pickled and continuous rolled, degreased, annealed, flattened, slit, and sizing lines.

 

 

When producing more precise shapes, the process involves

 

Decomposition

Semi-finishing

Sizing

Semi-roughing

Roughing

Finishing

Advantages of Cold Rolled Steel

Cold rolled steel typically results in a better, shinier surface and tighter tolerances. It can also produce a smoother surface that is greasy to the touch. Other advantages include

 

Can be used for precision applications

Harder and stronger than hot-rolled steel

Improved hardness, tensile strength and resistance to work-hardening deformation

Aesthetic finishes with a wider range of surface finishes

Applications for Cold-Rolled Steel

Cold rolled steel is used in applications where tolerances, surface conditions, concentricity and straightness are influential factors. It also provides a more aesthetically pleasing and visually appealing surface. Other applications include

 

Household appliances

Metal furniture

Aerospace structural parts

Automotive components


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