United Steel Industry CO.,LTD is a professional manufacturer & exporter of steel pipes in China. Products including carbon steel pipe(SMLS pipe/ERW/LSAW/SSAW),stainless steel pipe,galvanized steel pipe,alloy steel pipe and the related products.USI With stocked 60,000 tons various of steel material in 30,000 square meters warehouse ,located in Tianjin and Singapore. So far,United-Steel has built a first-class hot rolled and cold drawn production lines for seamless steel pipe, and HF welding and submerged arc welding