2.H section steel profiles are efficient and economical (There are other cold-formed steel, steel plate, etc.), as sectional shape is reasonable, they give greater play to the performance of steel to improve the bearing capacity. H is different from the ordinary h-beam that flange was widened, and the inner and outer surface is usually parallel, this would facilitate the connection to other components with high strength bolts. Its size constitutes a reasonable range, complete model, easy to design and select. (In addition to shaped steel beam for crane)

3, The flange of H-beam are of equal thickness, rolling ross-section, but also have the welding section by the three plate. Rolled I-beam are all the hot roll cross section , due to poor production techniques, the slope of the inner flange is 1:10.The rolling of H beam steel is different from normal I beam in just one level roll, because of its wide flange and no inclination (or slope is very small), so require the creation of a vertical roll rolling the same time, The rolling mill process and equipment is more complex than the normal.The largest height of h steel rolling 800mm in domestic, if pass  the combined cross-section can only be welded.