Purpose of screw steel: screw steel is widely used in building, bridge, road and other civil engineering construction. As far as the public facilities such as highway, railway, bridge, culvert, tunnel, flood control, dam, etc., as well as the foundation, beam, column, wall, slab and screw steel of housing construction are indispensable structural materials. With the development of urbanization in China, there is a strong demand for screw steel in infrastructure construction and real estate.