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172830 design steel frame products are offered for sale by suppliers on Alibaba.com, of which steel structures accounts for 7%, steel structure buildings accounts for 4%, and metal building materials accounts for 1%. A wide variety of design steel frame options are available to you, such as welding, bending and cutting.You can also choose from gb, aisi and astm design steel frame,as well as from q235, light steel, and q345 design steel frame, and whether design steel frame is steel workshop, steel fabricated house, or structural roofing.