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Factory 12 Inch 16 Inch 30 Inch Large Diameter Round Seamless Hot Rolled Carbon Mild Steel Pipe, Find Details and Price about Seamless Steel Pipe High-Quality Seamless Steel Pipe from Factory 12 Inch 16 Inch 30 Inch Large Diameter Round Seamless Hot Rolled Carbon Mild Steel Pipe - Topregal (tianjin) Industrial Co., Ltd.