1.building material steel frame,steel structure steel frame,portal steel structure 2.Hard and Durable 3.Environmental-friendly 1)Item name: building material steel frame,steel structure steel frame,portal steel structure2)Specification:Q235,Q3453 ... : 40FT GP,20FT GP, 40HQ,40OT 5)As a professional steel structure designer and manufacturer, we produce and export large varieties of ...