H-beam is divided into hot-rolled H-beam and welded H beam (H) are two types of hot-rolled H-beam is divided into wide flange H beam (HW) in H-beam flange (HM) and a narrow flange H beam (HN) three. HW is H-beam flange width and height substantially equal; mainly used for reinforced concrete frame structure column steel core columns, also known as King of the steel column; mainly used in steel H-beam column HM is the ratio of the height and width of the flange approximately 1.33 ~ 1.75, mainly in steel structure: steel frame columns used in the frame structure to withstand dynamic loads to do with the frame beam; for example: device platform HN is H-beam flange height and width ratio greater than or equal to 2, the main use the beam; steel beam uses the equivalent of HN; H 2 H-beam main material has Q235B, SM490, SS400, Q345, Q34