... design, Fabrication&manufacturing,delivery and erection of the Prefabricated(pre-engineered) Steel Building Hengda Steel Structure(HDSS ... delivery and erection of the Prefabricated(pre-engineered) Steel Building,Space Frames, Portable Cabins, Tubular Steel Structures,basic ... &Engineering Service, Steel Building,Space Frames, Portable Cabins, Tubular Steel Structures,basic building elements(built-up ...