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. We have obtained the honor of certificates issued by Tianjin Quality Supervising Bureau yearly. Our products are widely applied to machinery, steel construction structure, metallurgy, agricultural vehicle and lookum, motor industries, railway, highway fence, container inner structure, furniture and steel fabric, etc.