S355JR steel is a European standard structural steel. 355 is the value of the minimum yield strength, in Mpa, and JR stands for "good welding performance".
The chemical composition of S355JR steel includes carbon (C), silicon (Si), manganese (Mn), phosphorus (P), sulfur (S), chromium (Cr) and other elements.
S355JR is a low-alloy high-strength structural steel whose chemical composition is as follows:
Carbon (C): 0.24% max
Silicon (Si): 0.60% max
Manganese (Mn): 1.70% max
Phosphorus (P): 0.035% max
Sulfur (S): 0.035% max
Chromium (Cr): 0.30% max
Nickel (Ni): 0.25% max
Vanadium (V): 0.10% max
In addition to the above elements, S355JR steel may also contain trace amounts of copper (Cu), molybdenum (Mo), aluminum (Al) and other elements.
S355JR steel is a low-alloy high-strength steel, which has better weldability, machinability and plasticity than ordinary carbon steel, and is widely used in construction, engineering machinery, ocean engineering, railways, bridges, automobile manufacturing and other fields.
