H section steel is a new type of economic construction steel. H-beam section shape of the economic and reasonable, good mechanics performance, rolling section on each extension point is relatively uniform, small internal stress, compared with ordinary beams, with large section modulus, the advantages of light weight, saving metal, can make the structure reduce 30-40%; And because of its legs parallel to the inside and outside, leg side is right Angle, combined into components, can save welding, riveting work of 25%.