HEB steel is produced in different grades, such as S235, S275, and S355, each with distinct mechanical properties. The grade number indicates the minimum yield strength of the steel in megapascals (MPa). S235 grade HEB steel has a minimum yield strength of 235 MPa, making it suitable for applications with relatively low load requirements, such as interior building frames or light - duty industrial structures. S275 grade, with a minimum yield strength of 275 MPa, offers higher strength and is commonly used in medium - load applications, like multi - story residential buildings. S355 grade HEB steel, having a minimum yield strength of 355 MPa, is designed for heavy - duty applications, including large - scale industrial plants, high - rise buildings, and bridges. Higher - grade HEB steel generally exhibits better tensile strength, fatigue resistance, and ductility, enabling it to withstand more demanding loads and environmental conditions. These differences in mechanical properties allow engineers to select the most appropriate grade for specific project requirements, ensuring optimal performance and safety.
