Tianjin Tianliancheng Industry and Trade Co. Ltd specialize in producing welded pipes, square pipes, galvanized pipes, with most advanced technique of automatic cold-incurvature molding machine unit in China. The products are under ISO 9001 quality certification manage mode. Annual output of various pipes are more than seventy thousand tons, covering 20mm* 0.8mm?273mm* 13mm welded pipes and galvanized pipes over fifty tons and 15mm* 15mm* 0.6mm?400mm* 300mm* 13mm square pipes over twenty tons. ...