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ASTM A36 A53 Galvanized Iron Pipe Ss300 Ss400 Welded Zinc Coated Hot Dipped Galvanized Steel Gi Pipe for Gas and Oil, Find Details and Price about Galvanized Steel Pipe Gi Pipe from ASTM A36 A53 Galvanized Iron Pipe Ss300 Ss400 Welded Zinc Coated Hot Dipped Galvanized Steel Gi Pipe for Gas and Oil - TIANJIN BOER KING STEEL CO., LIMITED