Cold formed thin walled steel with steel plate or strip steel in the condition of cold bent into various cross section shape of finished steel. Cold bend section steel is a kind of economic cross section light thin wall steel, also known as the cold bending of steel profiles or cold bending profiles.
Application: cold formed steel as bearing structure, the retaining structure, accessories etc in light steel housing is a large number of applications. In housing construction, cold-formed steel can be used as a steel frame, truss, beam, column, such as main bearing component, is also used as roofing purline, wall frame beams, keel, doors and Windows, roof panel, wall panel, slab and other minor artifacts and retaining structure. In addition, the use of cold bend section steel, plate, column with reinforced concrete composite beams of cold bend section steel – concrete composite structure has become a new research direction in the field of engineering. Cold-formed thinwalled steel structures usually have pressed steel sheet, purline, wall beam, rigid frame, etc.
The classification of the square steel: steel pipe seamless steel pipe and welded steel pipe (tube) hot rolled seamless steel square tube, cold drawn seamless tube, extrusion of seamless pipe, welded pipe. Welded square tube is divided into: (a) according to the technological points – pipe arc welding, resistance welding square tube (high frequency and low frequency), gas welding tube, furnace welding pipe (b) according to the weld points – straight seam welded pipe, spiral welded pipe.