S235 and S275 are both commonly used structural mild steel grades. The main difference is their minimum yield strength: S235 has a minimum yield strength of 235 MPa, while S275 has a minimum yield strength of 275 MPa. This means S275 can withstand a greater load before permanently deforming.
Both grades offer good weldability, machinability and value for general fabrication. S235 is often used for hollow sections and general structural applications, while S275 is commonly specified for flat bar, round bar, square bar, angles and channels where additional strength is beneficial. Always check the required material grade against the project’s structural specification.
