Fine-grained structural steels convince users with their greater toughness, and thus also superior working and welding properties, compared to classical non-alloy structural steels. Since such steels, thanks to normalising annealing, regain their original microstructure in the "Normalised" delivery state, normalised fine-grained structural steels are ideally suitable for structural components produced by means of classical hot forming, or destined for subsequent normalising annealing during the production process.
Normalised fine-grained structural steels are traditionally produced by means of heat treatment, so-called "normalising annealing", after rolling. This heat-soaking to above the ferrite-austenite transformation temperature and subsequent slow cooling generates a fine, regular ferritic-pearlitic microstructure in the steel. Depending on plate thickness and the grade of steel involved, this form of heat treatment can nowadays also be replaced by normalising rolling – with exactly the same result.
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