PRODUCTION OF COILED STEEL PIPE AND PIPE STOCK FOR COILED STEEL PIPE

摘要

PURPOSE: To provide a manufacture for the coiled steel pipe which prevents the inside surface fold flaws of the coiled steel pipe and gas excellent cold workability by managing the bead height on the inside surface of an electric resistance welded tube to a certain specific range at the time of producing the coiled steel pipe 14 by hot stretch reducing. ;CONSTITUTION: The coiled steel pipe 14 is manufactured by cutting and/or grinding the inside surface beads of the electric resistance welded tube 11 to reduce the bead height from -200μm to +200μm, subjecting the tube to hot stretch reducing and coiling the tube.;COPYRIGHT: (C)1994,JPO&Japio