... exchangers products are widely used in petroleum, chemical, natural gas and metallurgy industries. For years, Our ... Baosteel Shanghai, Shoudu Iron and Steel Company, and other metallurgical companies; Sinopec Shanghai Gaoqiao Petrochemical, JSPCC, ... , Qilu Petrochemical, Sinopec Yangzi Petrochemical, and other Petrochemical companies; Daqing, Yumen , Shengli, Beihai and other natural gas companies