Title:
The Electric resistance seam steel pipe for line pipes
Document Type and Number:
Japanese Patent JP6213703
Kind Code:
B1
Abstract:
母材部の化学組成が、質量％で、Ｃ：０．０８０〜０．１２０％、Ｍｎ：０．３０〜１．００％、Ｔｉ：０．００５〜０．０５０％、Ｎｂ：０．０１０〜０．１００％、Ｎ：０．００１〜０．０２０％、Ｓｉ：０．０１０〜０．４５０％、及びＡｌ：０．００１〜０．１００％を含み、残部がＦｅ及び不純物を含み、式（１）で示されるＣＭｅｑが０．１７０〜０．３００であり、Ｍｎ／Ｓｉ比が２．０以上であり、式（２）で示されるＬＲが０．２１０以上であり、母材部の金属組織をＳＥＭを用いて１０００倍の倍率で観察した場合に、フェライト面積率が６０〜９８％であり、残部が焼戻しベイナイトを含むラインパイプ用電縫鋼管。ＣＭｅｑ＝Ｃ＋Ｍｎ／６＋Ｃｒ／５＋（Ｎｉ＋Ｃｕ）／１５＋Ｎｂ＋Ｍｏ／３＋Ｖ … 式（１）ＬＲ＝（２．１×Ｃ＋Ｎｂ）／Ｍｎ … 式（２）
Inventors:
Kensuke Nagai
Oozaki saki Masakazu
Noboru Hasegawa
Oozaki saki Masakazu
Noboru Hasegawa
Application Number:
JP2017535722A
Publication Date:
October 18, 2017
Filing Date:
March 13, 2017
Export Citation:
Assignee:
Nippon Steel & Sumitomo Metal Corporation
International Classes:
C22C38/00; C22C38/14; C22C38/50
Domestic Patent References:
| JP2014189808A | 2014-10-06 | |||
| JP2010506044A | 2010-02-25 | |||
| JP2002302716A | 2002-10-18 | |||
| JP2007015008A | 2007-01-25 |
Foreign References:
| WO2013027779A1 | 2013-02-28 |
Attorney, Agent or Firm:
Patent Service Corporation Taiyo International Patent Office
Previous Patent: The Electric resistance seam steel pipe for line pipes
Next Patent: METHOD AND EQUIPMENT FOR INSPECTING OSCILLATOR
Next Patent: METHOD AND EQUIPMENT FOR INSPECTING OSCILLATOR