Shaanxi Tongxin Continuous Cast Tube Tech Co., Ltd. is a leading manufacturer in continuous casting iron profile and related products. With well-equipped testing facilities and strong technical background, we innovated 'Vertical upward continuous casting' in 2006, by using this technology we manufactured a new product-----Cast Iron Hollow Bar, which filled the blank market in continuous casting iron profile at home and abroad. Comparing to sand casting,centrifugal casting or horizontal ...