... pre-engineered) Steel Building,Space Frames, Portable Cabins, Tubular Steel Structures,basic building elements(built-up welded H- ... section , hot-rolled H-section, channel, steel column, steel beam),standard frames, secondary framing, roof & wall materials ... welded H-section , hot-rolled H-section, channel, steel column, steel beam),standard frames, secondary framing, roof & wall materials ...