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530mm × 15mm × 12000mm Large Diameter Thick Wall Longitudinal Submerged Arc Welded LSAW Steel Pipe for Marine and Offshore Engineering, Piling and Load-Bearing, Find Details and Price about Marine Engineering Steel Pipe LSAW Steel Pipe from 530mm × 15mm × 12000mm Large Diameter Thick Wall Longitudinal Submerged Arc Welded LSAW Steel Pipe for Marine and Offshore Engineering, Piling and Load-Bearing - Qingdao Sangao Metal Structure Co., Ltd.