Qingdao Sangao Metal Structure Co., Ltd. is a manufacturer which is specialized in large diameter (from 400 to 2200mm)straight seam welded pipe, power tower, mobile communications tower, radio and television tower, large steel structure design, manufacture, installation of integrated companies. We have more than 350 employees, and annual sales are over USD 63, 000, 000, and export 30% of our products worldwide. Our well-equipped facilities and excellent quality control system throughout all ...   |