... 345, SS400,ST37-2,ASTM A36 Hebei Runcheng Steel Pipe Co., Ltd. is located in the historic city of Cangzhou City, ... Shandong, north of Beijing and Tianjin. With Beijing-Shanghai high-speed railway, Beijing-Shanghai, Beijing Highway, 104, 307 & 205 national roads ... API5L X52X60, British Standard (BS) 1387 (DIN ST37ST42) standard ST52 International (GB) T8162, T8163, T3087, 10#20# specification 1/ 2" ...