Designation and classification of S275J0 h-type steel beam
S: indicates that this is a structural steel. 275: refers to the minimum yield strength of 275 MPa (megapascals) for thickness up to 16 mm. J0: specifies the impact toughness, tested at 0°C, with a minimum energy absorption of 27 joules (longitudinal specimen). This distinguishes it from other grades, such as S275JR (tested at 20°C) or S275J2 (tested at -20°C).