I-type steel is a widely used in steel structure of the construction of purlins, wall beams, can also be combined into lightweight roof truss, bracket and other building components, in addition, can also be used in mechanical light manufacturing columns, beams and arms. It is widely used in steel structure plant and steel structure engineering. It is a common construction steel. It is made by cold bending of hot coil plate. I-type steel has thin wall, light dead weight, excellent section performance and high strength. Compared with traditional channel steel, the same strength can save 30% of materials