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　　Hollow Sections are made of plain carbon steel Hollow Sections and low alloy Hollow Sections. Common carbon steel is divided into Q195, Q215, Q235, SS400, 20 # steel, 45 # steel, etc. Low alloy steel is divided into Q345, 16Mn, Q390, ST52-3 and so on.

　　Standard Classification of Hollow Sections Production

　　Hollow Sections are divided according to production standards: national standard Hollow Sections, Japanese standard Hollow Sections, British standard Hollow Sections, American standard Hollow Sections, European standard Hollow Sections and non-standard Hollow Sections.

　　Classification of Hollow Sections Surface Treatment

　　Hollow Sections are divided into hot galvanized Hollow Sections(ASTM A53 Hot Dip Galvanized Steel Hollow Section), galvanized Hollow Sections, oiled Hollow Sections and pickled square pipes according to surface treatment.

　　Classification of Hollow Sections Use

　　Hollow Sections are classified according to their uses-square pipes for decoration, machine tools and equipment, square pipes for machinery industry, square pipes for chemical industry, square pipes for steel structure, square pipes for shipbuilding, square pipes for automobiles, square pipes for steel beams and columns, square pipes for special purposes.

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