Hot-rolled structural steel

Hot-rolled structural steel

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QualityMaterial-No.StandardOlder Designations
S235JR1.0038DIN EN 10025-2S235JRG2, RSt37-2Details
S235J01.0114DIN EN 10025-2St37-3UDetails
S235J21.0117DIN EN 10025-2S235J2G3, S235J2G4Details
S275JR1.0044DIN EN 10025-2St44-2Details
S275J01.0143DIN EN 10025-2St44-3UDetails
S275J21.0145DIN EN 10025-2Details
S355JR1.0045DIN EN 10025-2Details
S355J01.0553DIN EN 10025-2St52-3UDetails
S355J21.0577DIN EN 10025-2S355J2G3, St52-3NDetails
S355K21.0596DIN EN 10025-2S355K2G3Details
S460JR1.0507DIN EN 10025-2St55Details
S460J01.0538DIN EN 10025-2Details
S460J21.0552DIN EN 10025-2GS-52Details
S460K21.0581DIN EN 10025-2Details
S500J01.0502DIN EN 10025-2Details

Hot-rolled structural steels according to DIN EN 10025-2

Hot-rolled structural steels conforming to DIN EN 10025-2 are versatile steels used in a wide variety of building and construction applications. These steels are characterized by their high strength, good formability, and excellent weldability. They are available in various delivery conditions and under specific rolling processes that influence the material’s mechanical properties according to the requirements.

Delivery conditions and rolling processes
The standard DIN EN 10025-2 specifies three essential delivery conditions for hot-rolled structural steels:

+N (normalized or normalized rolled): In this condition, the steel is normalized during or after rolling, meaning that the steel’s microstructure is homogenized through controlled heating and subsequent slow cooling. This results in a uniform distribution of mechanical properties and ensures high strength and toughness of the material.
+AR (as rolled): Steels in this condition are supplied without further heat treatment, i.e., “as rolled”. They are more cost-effective because no additional thermal treatment is required, but generally offer lower mechanical properties than normalized steels.
+M (thermomechanically rolled): In this process, the steel is thermomechanically treated during the rolling process to increase its strength while ensuring good weldability and toughness. Thermomechanically rolled steels offer an excellent combination of high strength and good machinability.

Weldability and Formability
Structural steels according to DIN EN 10025-2 are readily weldable due to their chemical composition and mechanical properties. This makes them ideal for use in load-bearing structures where high weld strength is required. These steels are also characterized by their excellent formability, meaning they can be easily shaped without losing their strength and toughness.

Cold Formability and Hot Forming
Hot-rolled structural steels can be cold-formed and hot-formed. Cold formability is particularly important in the production of components requiring precise and tight tolerances, such as in bending or roll forming. These steels are also suitable for flame straightening, which is necessary for correcting deformations or adjusting components. At higher temperatures, hot forming allows for the simple and efficient machining of larger workpieces.

Hot-dip galvanizing and surface finish
Another important characteristic of structural steels according to DIN EN 10025-2 is their suitability for hot-dip galvanizing. This galvanizing protects the steel from corrosion and extends its service life, which is particularly advantageous in outdoor applications. The surface finish varies depending on the product form (strip, sheet, or wide flat bar) and influences the choice of steel depending on the end application.

In summary, hot-rolled structural steels according to DIN EN 10025-2 offer high flexibility for use in a wide variety of applications where weldability, formability, and corrosion protection are required. They are available in various delivery conditions specifically tailored to the mechanical requirements and processing methods.

Quality Guide Download: Hot rolled structural steel

Behind this download you will find our ESB Quality Guide (data sheet) for hot-rolled structural steel.

QG DOWNLOAD
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