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Coen Steel Sheet & Plate

Coen Steel sources and holds the most extensive range of standard and specialised premium-grade steel plates, ensuring that we can meet the needs of steel metal fabricators, manufacturing and engineering companies throughout Ireland.

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Commonly Asked Questions About Sheet Metal & Steel Plate

Both hot rolled steel and cold rolled steel start out in essentially the same way and both can have the same grades and specifications. Cold rolled steel undergoes additional processing steps, resulting in improved properties that can be exploited for different applications. Each type of steel has its advantages and disadvantages and costs for the two types of steel are also different.

How It’s Made

Both cold rolled and hot rolled steel start out as large steel slabs or billets cast from hot liquid metal. The billets are then heated, eventually reaching over 1700°F. At this high temperature, they are easily flattened into a long sheet using a set of rollers, and then wound up into large coils. To make bars or plates, the heated billet is rolled to the desired thickness and cut into sections before cooling.

As the rolled or cut steel cools to room temperature, it shrinks slightly, making the final dimensions of each piece less exact and the edges somewhat rounded. The surface is slightly rough and covered in scale. At this point, hot rolled steel products are ready for shipment, and require no further treatment.

Cold Rolling Processes

Cold rolled steel products are destined for further processing after the steel has cooled. Cold rolling is most often used to decrease the thickness of plate and sheet metal in the manufacturing stage. This “cold forming” occurs either by re-rolling at around room temperature and then coiling into sheet, or else drawing into bars or tubes. Additional steps such as drawing, grinding or turning create the desired finished product.

Work hardening of the metal at room temperature increases its hardness and yield strength by introducing crystalline defects, but also may cause internal stresses that must be relieved by heating, or else the final product may warp.

Finishing Touches

Cold rolled or cold formed steel has a smooth, shiny finish with an oily texture that is free of rust or scale so it can easily be painted or chromed. The dimensions of the final product are more precise and square, with a sharper edge, and cold rolled steel sheet can hold tighter tolerances than hot rolled when machined or otherwise fabricated.

In general, cold rolled costs more than hot rolled steel because of the extra processing steps.

S275JR and S355JR steel are low alloy steel materials under standard EN10025-2. In the steel grades, “S” means structure steel, the number “275” and “355” means the Min. yield strength of S275JR and S355JR steel are 275Mpa and 355Mpa respectively. “JR” indicates the steel needs +20℃ impact test.

What is the difference between S275JR and S355JR steel?
Chemical composition difference between S275JR and S355JR steel: %

Grade C (t≤16mm) Si Mn P S Cu N
S275JR 0.24max 1.60max 0.045max 0.045max 0.60max 0.014max
S355JR 0.27max 0.6 1.70max 0.045max 0.045max 0.60max 0.014max

Mechanical properties difference between S275JR and S355JR steel:

Grade Yield strength ReH/(N/mm2) (t≤16mm) min Tensile strength Rm/(N/mm2) (3mm≤t≤16mm) Elongation A/%(3mm≤t≤40mm) min Charpy V test Temperature/℃ Charpy V test Impact energy (Longitudinal)/J min
S275JR 275 410-560 23 20 27
S355JR 355 470-630 22 20 27

The chemical composition difference between S275JR and S355JR steel is not outstanding other than Carbon content. The carbon content of S355JR steel is higher than S275JR steel. Accordingly, the S355JR steel strength is higher than S275JR steel strength.

Product Range & Sizes Available

Other sizes available upon request

Our typical stock sheet size ranges from 3000mm x 1500mm to 6000mm x 2500mm. Decoiled sizes available upon request