Wulanchabu Zhonghan City Development CO., Ltd which belongs to Tianjin Hongli Group , was established in 2003 . The CEO of our company , Shengguang Yu , has won many customers , because he adheres to the principle the advanced equipment , scientific management , reliable products quality , high - class service . Our main products are petroleum casing pipes, petroleum line pipe , high frequency welded pipes , galvanized steel pipes ,...