I-beam and H-beam

　　I-beam and H-beam are two common types of long steel bars with I-shaped sections, which are widely used in fields such as construction, bridges, ships, machinery, etc. But there are also some differences between them, mainly reflected in the following aspects:

　　Section shape: The flange of the I-beam is variable in cross-section, with a thick web part and a thin outer part; The flange of H-shaped steel is of equal cross-section.

　　Specification representation: The specifications of I-beams are expressed in millimeters of waist height, leg width, and waist thickness, such as I-160 × eighty-eight × 6; The specifications of H-shaped steel are expressed in millimeters of waist height, flange width, and waist thickness, such as H200 × two hundred × eight × 12.

　　Model source: The model of I-beam represents the centimeter of waist height, such as I-16 #; The models of H-shaped steel are derived from European standards, such as HW, HM, HN, HEA, HEB, HEM, etc.

　　Application scope: Due to the significant difference in the inertia moments of the two main axes of the cross-section, I-beam can only be directly used for components that are bent in the plane of its web or formed into lattice load-bearing components; H-shaped steel, due to its reasonable cross-sectional shape, can enhance its efficiency and improve its load-bearing capacity. It can be used in axially compressed components or components with bending perpendicular to the web plane.