H beams are divided into hot-rolled H-beams and welded H-beams (H). Hot-rolled H-beams conclude wide-flange H-beams (HW), middle-flange H-beams (HM) and narrow-flange H-beams (HN).
HW is H beam with basically same height and flange width, which is mainly used as core column in reinforced concrete frame structure, also called stiff steel column. HM is H beam that the ratio of the height and flange width is roughly 1.33~~1.75.
Mainly used in steel structures as steel frame columns that bear dynamic loads, such as equipment platforms. HM is H beam that the ratio of the height and flange width is greater than or equal to 2. The main materials of H-beam are Q235B, SM490, SS400, Q345, Q345B, etc.
