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Spiral-seam Welded Steel Pipe, SSAW（Outer Diameter 219 - 3040mm, W...
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Longitudinal Submerged-Arc Weld Pipe ( ASTM A252 GR 3, 508*20*19500m...
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Galvanized Square Hollow Sections（Out Diameter 20x20 - 600x600 mm W...
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