In recent years, We have developed more than ten series of roll forming steel machine from initial single layers of roofing iron, totally can meet all steel construction need of architecture, the series bite and latent type wall and roof panel production line; Serial color steel and insert core steel production line; purlin production line of Serial C section steel and Z section steel line numerical control with drilling. Serial steel structural floor panel the production line of the panel; production line of Guardrail panel of the expressway, production line of PU sandwich panel. Series sets of girder columniation curve and no girder columniation curve of Roof panel system. zw_bella@yahoo.com.cn