Focus on Steel and Mechanical Engineering
Structural Steel in Perfection
Construction steels are “standard” steels for steel construction and mechanical engineering.
The most commonly used grades belong to the category of basic steels. They are mainly low alloyed and only partially heat treated (if heat treated, then normalized,) which is sufficient for many applications.
Nowadays, no classical distinction is made between structural steels and quality steels. The decisive factor is the classification according to composition and technical parameters on the one hand and according to intended use on the other. Alloyed stainless steels are also used as structural steels, for example.
In general, virtually all low-carbon steels are classified as structural steels. The boundaries are blurred for the more carbon-rich grades. Structural steels generally have a minimum tensile strength of less than 500 N/mm². According to the new DIN EN standards, structural steels are all steels that are not directly used as tool steel.
Designations are e.g.
S235JR+AR (new DIN EN 10025, 10.2004)
S355J2+N (new DIN EN 10025, 10.2004)