High-strength constructional steel

High-strength constructional steel

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QualityMaterial-No.Standard
S460Q1.8908DIN EN 10025-6Details
S460QL1.8906DIN EN 10025-6Details
S460QL11.8916DIN EN 10025-6Details
S500Q1.8924DIN EN 10025-6Details
S500QL1.8909DIN EN 10025-6Details
S500QL11.8984DIN EN 10025-6Details
S550Q1.8904DIN EN 10025-6Details
S550QL1.8926DIN EN 10025-6Details
S550QL11.8986DIN EN 10025-6Details
S620Q1.8914DIN EN 10025-6Details
S620QL1.8927DIN EN 10025-6Details
S620QL11.8987DIN EN 10025-6Details
S690Q1.8931DIN EN 10025-6Details
S690QL1.8928DIN EN 10025-6Details
S690QL11.8988DIN EN 10025-6Details
S890Q1.8940DIN EN 10025-6Details
S890QL1.8983DIN EN 10025-6Details
S890QL11.8925DIN EN 10025-6Details
S960Q1.8941DIN EN 10025-6Details
S960QL1.8933DIN EN 10025-6Details

Hot-rolled structural steels with higher yield strength in the quenched and tempered condition according to DIN EN 10025-6

DIN EN 10025-6 specifies the requirements for hot-rolled structural steels with higher yield strength in the quenched and tempered condition, primarily used in demanding construction applications. These steels are characterized by high strength and toughness, offering optimal mechanical properties through quenching and tempering, which are essential for highly stressed structural components. Quenched and tempered steels are known for their increased yield strength, enhancing their load-bearing capacity and ensuring shape stability even under significant stress. This makes them ideal for applications requiring high resistance to external influences, such as in heavy industry, offshore applications, or large infrastructure projects.

Quality Groups and Impact Toughness

An important aspect when selecting structural steels according to DIN EN 10025-6 is their suitability for specific climatic conditions and mechanical stresses. This is regulated by classification into quality groups, which are distinguished by different minimum requirements for impact toughness at defined temperatures.
Impact toughness indicates how much energy a material can absorb before fracturing. This is especially crucial in cold climates, as many materials become more brittle and prone to fracture at low temperatures.

Quality Group Q: For applications requiring a minimum impact toughness at –20 °C. Steels in the Q quality group are well-suited for temperate climates, where high toughness and resistance to impact must be ensured despite low temperatures.
Quality Group QL: This grade offers higher toughness at even lower temperatures and meets the minimum impact toughness requirement at –40 °C. As a result, steels in the QL quality group are ideal for colder regions, such as high-altitude areas or environments where severe frost may occur.
Quality Group QL1: The highest grade, requiring a minimum impact toughness at –60 °C. Steels in the QL1 quality group are primarily used in extremely cold environments, such as the Arctic or other polar regions, where temperatures can drop to –60 °C or even lower. Their high toughness ensures that they do not become brittle even under these extreme conditions.

Application and Properties

Hot-rolled structural steels with higher yield strength in the quenched and tempered condition offer excellent strength, achieved through a very fine-grained microstructure. These steels are characterized by their high weldability and machinability and, despite their high strength, can be processed well. This makes them highly versatile for use in demanding applications.

Applications for these steels can be found in heavy industry, such as the manufacturing of components for cranes, bridges, or highly stressed steel structures. They are also frequently used in the offshore industry, where both high strength and exceptional toughness are required to withstand the extreme conditions at sea.

The classification into quality groups and the associated determination of impact toughness according to DIN EN 10025-6 ensures that the structural steels meet the specific requirements of the respective application conditions, thus guaranteeing a long service life and high safety.

Quality Guide Download: High-Strength Structural Steel

Behind this download, you will find our ESB Quality Guide (datasheet) for high-strength structural steels.

QG DOWNLOAD
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Alex Bachmann
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