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　　1. Description of hollow sections

　　hollow sections is a hollow square section light-weight thin-walled hollow sections, also known as steel refrigeration bending profiles. It is made of Q235 hot-rolled or cold-rolled strip or coil as base material by cold bending, forming and high frequency welding. Except for wall thickness increasing, the corner dimension and edge flatness of hot-rolled hollow sections with extra-thick wall reach or even exceed the level of resistance welding cold-formed hollow sections. It has good mechanical properties, weldability, cold, hot working and corrosion resistance, and has good low temperature toughness.

　　2. Use of hollow sections

　　ASTM A103 13 Inch Cold Drawn Hollow Section are used in construction, machinery manufacturing, steel construction and other projects, shipbuilding, solar power generation bracket, steel structure engineering, electricity, etc.

　　Power Engineering, Power Plant, Agricultural and Chemical Machinery, Glass Curtain Wall, Automotive Chassis, Airport, Boiler Construction, High-speed Road Barrier, Housing Construction, Pressure Vessels, Petroleum Storage Tanks, Bridges, Power Plant Equipment, Lifting Transportation Machinery and Other Welded Structures with Higher Load.

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