Tianjin Co-Working Developing Co., Ltd. is a manufacturer of steel pipes and steel pipe fittings, with well-equipped testing facilities and strong technical force. We are also the steel pipe agent of TPCO, Bao steel and Hengyang steel. With a wide range, good quality, reasonable prices, our products are extensively used in oilfield, chemical industry, sewage treatment, urban central heating, and other industries. Our products are widely recognized and trusted by users and can meet continuously ...