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Description:Features: 1) Size: from 50 x 50 to 400 x 400mm 2) Thickness: 2 - 12mm 3) Length: 6 - 16m 4) Trademark: Q235, Q345, Q195 5) Form of welding line: straight sew 6) Production technics: resistance welding 7) Port of pipe: without screw thread Our company has 125, 250, and 400 three lines of square production line. Our annual yield of all kinds of square and rectangular steel tube is 30,000MT. The size is from 50 x 50 to 400 x 400mm, and the thickness is from 2mm to 12mm.