... )Chemistry industry5)Drainage project, city construction6)civilian water,steel structure construction, mineral industry, machinery, communication 7)hydraulic ... ago, Tianjin Shangyi Metal Structure Trade Co., Ltd was only a steel producing company which was busy with domestic ... all kinds of steel products, specialized in H-Beam, I Beam, Steel Plates, Steel Tubes, Steel Angles, Steel Channels, Purlins and ...