S235JR is a widely used structural steel grade. The weldability and ductilyty are good.
S refers to Structural, 235 is the yield strength in N/mm² (MPa) for the smallest thickness range.
JR relates to the Charpy impact test value: JR = 27Joules at 20° C.
S235JR is kept in stock in thicknesses of 4 to 600 mm and can be delivered with 3.1 en 3.2 certificate.