Steel structure(rigid steel frame structure,light steel structure,famous steel structures) Standard: AISI, ASTM, BS, DIN, GB, Steel structure(rigid steel frame structure,light steel structure,famous steel structures)Quick DetailsStandard: AISI, ASTM, ... sizes1) prefabricated and customized design2) light weight, high strength, large span3) short construction time, lower cost, time-saving and labor ...