... Tube Co. Ltd. (JYDR) is one of the leading manufacturers, exporters and importers of PRECESION STEEL PIPES & TUBES, based in ... Jiangyin city, Yangtze River Delta, China. The factory locates alongside the Xicheng River of ... 160Mn, 20GrMo, 35GrMo, 40Gr. The products have the characteristics of small-sized, heavy-wall thickness, high precision, inner or ...