Title:
Ｃｒ含有電縫鋼管及びその製造方法
Document Type and Number:
Japanese Patent JP7087653
Kind Code:
B2
Abstract:
To provide an electroseamed steel pipe excellent in corrosion resistance, and containing Cr over 3%.SOLUTION: In a Cr-containing electroseamed steel pipe containing Cr as much as 3.0-32.0 mass%, concerning Cr oxide defects existing on a welding surface, an evaluation length L, the maximum defective length Lin L, and a ratio Lbetween the evaluation length Land a total defect length (total of line lengths of exposed defects) satisfy following formulas (1), (2), and thereby corrosion resistance of a weld zone becomes equivalent to that of a parent metal: L[mm]≤0.1...(1) (100×L/L)[%]<-0.5×L[mm]+0.1...(2).SELECTED DRAWING: Figure 5
Inventors:
Fuminori Watanabe
Application Number:
JP2018091870A
Publication Date:
June 21, 2022
Filing Date:
May 11, 2018
Export Citation:
Assignee:
Nippon Steel Corporation
International Classes:
C22C38/00; B21C37/08; B23K13/08; C22C38/38; C22C38/58; H05B6/10
Domestic Patent References:
| JP8035010A | ||||
| JP6184637A | ||||
| JP2014036983A | ||||
| JP2017179480A |
Foreign References:
| WO2011034119A1 |
Attorney, Agent or Firm:
Patent Attorney Corporation Kusunoki Patent Office
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