... TUBES, based in Jiangyin city, Yangtze River Delta, China. The factory locates alongside the Xicheng River of Yuecheng Town, which is the most ... the engagement in R&D, manufacturing and international trade of precision steel tubes, and has more than 3500 tons’ ... #, 160Mn, 20GrMo, 35GrMo, 40Gr. The products have the characteristics of small-sized, heavy-wall thickness, high precision, inner or outer ...