At one time quality specifications for steel in many European countries varied significantly, leading to misunderstandings. Against that background, national quality specifications were replaced by a single system of European quality specifications. European standard EN 10025 describes the technical delivery conditions for hot rolled products of structural steels. This standard was produced to prevent confusion on steel grades and steel products.
Various symbols using letters and/or figures are used in addition to standard EN 10025 to further specify the Grade and properties of structural steel.
For instance, steel plate categorised as EN 10025 S235J2+N implies that the steel:
The notch test reading gives an indication of the relative ductility or brittleness of steel. The reading shows how much energy is absorbed by a tested bar of the material in question at a specific temperature before fracture. In this case the steel gives a guaranteed notch test reading of 27J at -20ºC (J2).
|Specification||Test Temperature(Cº)||Minimum Energy absorbed (J)|
Where applicable, the specification may be followed by: