Shijiazuhang Canglong Pipeline Co., Ltd is specialized in the production of Longitudinal welded pipe, spiral welded pipe and seamless steel pipe, which can be done by just a few enterprises in China. With advanced JCOE production technology, first-rate production equipment, PID automatic control and J-C-O molding process, we can produce large diameter longitudinal double submerged arc welded pipe which is inerratic in shape.