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Title:
METHOD FOR MANUFACTURING HIGH-STRENGTH THICK ELECTRIC RESISTANCE WELDED STEEL PIPE EXCELLENT IN SOUR RESISTANT PROPERTY OF ELECTRIC RESISTANCE WELDED PART
Document Type and Number:
Japanese Patent JP2013006207
Kind Code:
A
Abstract:

To provide a method for manufacturing a high-strength thick electric resistance welded steel pipe excellent in a sour resistant property of an electric resistance welded part, wherein hydrogen induced cracking does not occur in the electric resistance welded part in HIC (Hydrogen Induced Cracking) test of the NACE regulation.

In the electric resistance welded part, by plastically deforming a welded end face, a welded end part shape just before electric resistance welding is formed in a groove shape having a taper-like pipe inner face side groove part 6 wherein a groove width is (1/7)t to (3/7)t from a parallel part 5 of the middle in a t direction to the pipe inner face side, with respect to a plate thickness t direction and wherein a groove angle is 15-45°, and a taper-like pipe outer face side groove part 7 wherein a groove width is (1/7)t to (3/7)t from the parallel part to the pipe outer side and wherein a groove angle is 15-45°, the equal circle diameter of each of oxides 1 in the electric resistance welded part is 20 μm or below, and the equal circle diameter of a cluster 2 that is a group wherein a plurality of oxides gather together at the nearest neighbor interval of 100 μm or below is 300 μm or below.


Inventors:
YOKOYAMA HIROYASU
OKABE YOSHITOMO
TOYODA SHUNSUKE
Application Number:
JP2011142049A
Publication Date:
January 10, 2013
Filing Date:
June 27, 2011
Export Citation:
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Assignee:
JFE STEEL CORP
International Classes:
B21C37/08; C22C38/00; C22C38/06; C22C38/50
Domestic Patent References:
JP2011026695A2011-02-10
JP2006063351A2006-03-09
JP2008240145A2008-10-09
JP2008100277A2008-05-01
JP2009120899A2009-06-04
JP2007090415A2007-04-12
JP2004346355A2004-12-09
JPS62274049A1987-11-28
JPH0941083A1997-02-10
JP2011025311A2011-02-10
JP2011026695A2011-02-10
JP2006063351A2006-03-09
JP2008240145A2008-10-09
JP2008100277A2008-05-01
JP2009120899A2009-06-04
JP2007090415A2007-04-12
JP2004346355A2004-12-09
JPS62274049A1987-11-28
JPH0941083A1997-02-10
Foreign References:
GB1520552A1978-08-09
US20010052511A12001-12-20
GB1520552A1978-08-09
US20010052511A12001-12-20
Attorney, Agent or Firm:
Eiichi Kobayashi
Suzuki Yoko



 
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