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JIS G3466 STKR400/490 Square Steel Pipes 1) Dimensions: 30*30mm-400*600mm, Thickness: 2-25mm Length: <13m 2) Material: Q195, Q235, Q345, 20#, 16Mn, ST37/44/ST52, ASTM A53/106, STKR490/STKR400, ASTM ...