• 10.09.2023
• Opertor

What is S355JR ?

What do the letters and numbers in S355JR Quality signify? 

It is a type of non-alloy structural steel that can be chosen for designs requiring high mechanical strength but not seeking corrosion or wear resistance.
The letter "S" comes from the first letter of "Structural" in English, indicating that the material belongs to the group of structural steels.
The number 355 represents the material's yield strength value. It signifies that the material does not undergo permanent deformation up to 355 MPa in an impact test at room temperature (20°C) with an energy of 27 Joules.

S     ⇒  ⇒ Structural

355 ⇒Minimum yield strength of 355 MPa 

J     ⇒  Minimum impact energy of 27 Joules

R     ⇒At Room temperature (20°C)