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Description:Our company with the production line of 400*400 square and rectangular steel tubeand cold bending section steel units, the company mainly produces heavy calibrewelded steel tubes which are applied in architecture steel structure such as gymnasium, exhibition hall, coal mine, workshop and textile machinery.Square pipe: Standard (GB/T6728-2002) or ASTM A500 or EN10219150 x 150 x (4-10)mm, 200 x 200 x (4-14)mm, 300 x 300 x (6-16)mm160 x 160 x (4-12)mm, 220 x 220 x (5-14)mm, 350 x 350 x (8-16)mm180 x 180 x (4-12)mm, 250 x 250 x (5-16)mm, 400 x 400 x (8-16)mmRectangular pipe: Standard (GB/T6728-2002) or ASTM A500 or EN10219100 x 300 x (6-12)mm, 200 x 300 x (6-14)mm, 250 x 450 x (6-16)mm150 x 200 x (4-12)mm, 200 x 350 x (6-14)mm, 250 x 500 x (8-16)mm150 x 250 x (4-12)mm, 200 x 400 x (6-14)mm, 300 x 350 x (8-16)mm150 x 300 x (5-12)mm, 250 x 300 x (6-14)mm, 300 x 400 x (8-16)mm150 x 350 x (6-12)mm, 250 x 350 x (5-14)mm, 300 x 450 x (8-16)mm200 x 250 x (5-12)mm, 250 x 400 x (6-16)mm, 300 x 500 x (8-16)mm