... ) Steel Building Hengda Steel Structure(HDSS) has totally six subsidiaries located in Zhejiang, Jiangsu and Anhui province,which ... 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 ...