Title:
電縫鋼管及び電縫鋼管の製造方法
Document Type and Number:
Japanese Patent JP6780489
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an electroseamed steel pipe in which buckling due to diameter reduction processing is suppressed.SOLUTION: An electroseamed steel pipe in which a position at which a wall thickness is reduced by 5% or more of a circumferential direction average value and a position at which a wall is recessed by 0.2% or more of the circumferential direction average value are not overlapped. Further, an electroseamed steel pipe in which a circumferential direction position at which a wall thickness becomes minimum and position at which an outer diameter becomes minimum are separated from each other by ±10° or more and which has an excellent diameter reduction processing strength. A method for manufacturing an electroseamed steel pipe by which an electroseamed steel pipe having an excellent outer diameter deviation can be manufactured as a number of stages is less since reduction of a wall thickness is easy to occur at a portion contacting an edge-bending roll, and an electroseamed steel pipe, in which a number of stages of the edge-bending roll is two or less, and a plastic processing quantity by a sizing roll is 1.2% or more and which has an excellent diameter reduction processing strength, can be method.SELECTED DRAWING: Figure 1
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Inventors:
Sato Kato
Manabu Wada
Manabu Wada
Application Number:
JP2016246397A
Publication Date:
November 04, 2020
Filing Date:
December 20, 2016
Export Citation:
Assignee:
Nippon Steel Corporation
International Classes:
B21C37/08
Domestic Patent References:
| JP6304647A | ||||
| JP2012223791A | ||||
| JP2016140867A | ||||
| JP7284865A | ||||
| JP2007222881A | ||||
| JP5161920A | ||||
| JP2006122932A |
Attorney, Agent or Firm:
Patent Business Corporation Najima Patent Office