WHAT CAN HUDDINGE STåL DO?
Cold rolled sheet is flexible in terms of design and shape.
At Huddinge Steel, we offer quality assignments in
cutting, welding, and
painting of cold rolled sheets.
Cold rolled sheets are cut using band saws and circular saws. Wehave optically controlled cutting machines that enable finely cut details. We deliver forged blanks in various shapes and qualities.
We cut and trim to the dimensions and angles you need.
We also offer welding of cold rolled sheet according to your wishes. At Huddinge Steel, we have access to IWS competence for welding supervision for EXC2, fully in accordance with SS EN 1090-2.
We also perform painting of structures with a length of up to 22 meters and a width of up to 4 meters. The painting takes place in Huddinge, and we do both priming and painting, class 1 to 5.
COLD ROLLED SHEET OR HOT ROLLED SHEET?
What is
the difference between hot rolled and cold rolled sheet? And which one should you choose?
It is important to know that the difference between cold rolled and hot rolled sheet comes from a difference in the manufacturing process, not a material difference. Simply put,
the process for cold rolled sheet is an extension of hot rolled sheets.
In short, hot rolled sheet has worse tolerances and a more uneven surface. Cold rolled sheet has lower tolerances and a finer surface but a higher price.
Cold rolled sheet is therefore only used in applications where, for example, better tolerances and mechanical properties are necessary.
ADDITIONAL DIFFERENCES BETWEEN COLD ROLLED AND HOT ROLLED SHEET:
Hot Rolled Sheet:- Slightly rounded corners and edges
- Slightly misshapen due to cooling
Cold Rolled Sheet:- Better, more processed surfaces with tighter tolerances
- Fine, oily surfaces ready for painting
- Well-defined corners and edges
- Harder and stronger due to strain hardening
PROCESS DIFFERENCES
Steel can either be hot rolled or cold rolled, both with different processes and results.
The first step in these processes is similar, but it is in the later stages that they differ. Cold rolling can be seen as an extension of hot rolling with added benefits.
Step 1: Initial Rolling (applies to both hot and cold rolled sheets)
Both processes, hot and cold rolling, start with large sheet metal or metal plates. These are then heated to easily form into large sheets or rolls. When the rolls are shaped, they cool down.
Steel that cools down to room temperature tends to shrink slightly, meaning that the roll's dimensions change slightly during cooling. The cooling can also result in the steel's edges becoming slightly rounded.
After this step, hot rolled steel is usually ready to be sent on without further treatment, unlike cold rolled steel.
Step 2: Cold Rolling (applies only to cold rolled sheets) Cold rolling involves additional steps after the steel has cooled. This type of rolling is often used to reduce the metal's thickness and is usually performed after hot rolling. After cold rolling, the steel is rolled up into rolls or formed into tubes or bars.
Cold rolling is often followed by other production processes such as milling or edge pressing. These techniques are used to create the finished products or the components to be assembled into the final products.
When steel has been cold rolled, it has a smooth, shiny surface. This surface is easy to paint, and the product's dimensions should be exact, with sharp edges.
Cold rolled steel can handle stricter tolerances than hot rolled steel, which can be advantageous if the product is to be placed in machinery for further processing.
THE ECONOMIC FACTOR
Due to the additional steps required for cold rolled sheet, hot rolled sheet is generally cheaper than cold rolled sheet.
