Electric resistance welded steel pipe having identifiable seam portion and method for manufacturing the same

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United States of America Patent

PATENT NO 11045896
APP PUB NO 20190255646A1
SERIAL NO

16403731

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Abstract

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A method for manufacturing an electric resistance welded steel pipe having an identifiable seam portion. The method includes electric resistance welding a steel pipe, cutting an inner surface bead and an outer surface bead of the steel pipe in such a manner so as to cut: (i) a whole the outer surface bead and a part of the inner surface bead to leave an uncut portion in the inner surface bead, or (ii) a whole of the inner surface bead and a part of the outer surface bead to leave an uncut portion in the outer surface bead, coating the steel pipe with zinc phosphate, and cold drawing the steel pipe using a plug and a die to make the seam portion of the steel pipe identifiable.

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Patent Owner(s)

Patent OwnerAddress
JFE STEEL CORPORATION2-3 UCHISAIWAI-CHO 2-CHOME CHIYODA-KU TOKYO 100-0011

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hori, Hiromichi Handa, JP 7 14
Iwazaki, Kenichi Ichihara, JP 9 22
Kokubo, Shinsaku Handa, JP 5 4

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