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YOUFA free sample 40x40mm galvanized square steel pipe for construction, US $ 600 - 650 / Ton, bs, ASTM, GB, BS 1387, ASTM A53-2007, GB/T9711, A53-A369, Q195-Q345, A53(A,B), Q235, Q345, Q195, Q215, 1 - 16 mm.Source from Tianjin Youfa Dezhong Steel Pipe Co., Ltd. (YOUFA) on Waimaotong.com.