Tianjin Lanming Steel Manufacturing Co., LTD. was found in 2007, engaged in production, process and trade of double submerged Arc spiral(GB/T9711.1-1997 and SY/T5037-2000 standards), welded pipe, galvanized pipe, scaffolding tube (GB/T12793 and GB/T3092) large diameter longitudinally welded pipes (GB/T3091- 2001 standard), square tube, rectangular tube (GB/T6728-2002), the products have passed the ISO9001-2000 international quality management system certification, widely used in water engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, construction, oil/water, bridge, construction support, mechanical pipe and so on. Our company adhere to quality and cooperation. Welcome new and old customers to consulte and purchase!