Title:
PRODUCTION OF COILED STEEL PIPE AND PIPE STOCK FOR COILED STEEL PIPE
Document Type and Number:
Japanese Patent JPH06238488
Kind Code:
A
Abstract:
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.
Inventors:
WATABE YOSHIHIRO
KASHIWAMURA HIDEKI
TAKASUGI NAOKI
KASHIWAMURA HIDEKI
TAKASUGI NAOKI
Application Number:
JP4991593A
Publication Date:
August 30, 1994
Filing Date:
February 17, 1993
Export Citation:
Assignee:
NIPPON STEEL CORP
International Classes:
B21C37/30; B21D11/06; B23D1/24; B23K13/00; B23K31/00; B23K37/08; (IPC1-7): B23K37/08; B21C37/30; B21D11/06; B23D1/24; B23K13/00; B23K31/00
Attorney, Agent or Firm:
Spring Inoue (1 person outside)