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Patent Searching and Data


Title:
ELECTRIC RESISTANCE WELDED STEEL TUBE FOR COILED TUBING, AND PRODUCTION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2018/139096
Kind Code:
A1
Abstract:
Provided are: an electric resistance welded steel tube for coiled tubing which has a yield strength of 896 MPa or higher, and exhibits excellent low cycle fatigue resistance, without being subjected to whole tube quenching treatment and reheating tempering treatment after electric resistance welding; and a production method therefor. The present invention has a specific content, in mass%, of C, Si, Mn, P, S, Al, Cr, Cu, Ni, Mo, Nb, V, Ti, and N, and has a structure comprising, in volume fraction, 2-10% of retained austenite, and 20% or less of martensite, the remainder being bainite. The present invention has a yield strength of 896 MPa or higher, and a uniform elongation of 9.0% or higher.

Inventors:
MATSUMOTO AKIHIDE (JP)
NAKATA HIROSHI (JP)
TOYODA SHUNSUKE (JP)
Application Number:
PCT/JP2017/044846
Publication Date:
August 02, 2018
Filing Date:
December 14, 2017
Export Citation:
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Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; C21D8/10; C21D9/08; C21D9/50; C22C38/58
Domestic Patent References:
WO2016143270A12016-09-15
Foreign References:
JP2010111931A2010-05-20
JP2012214875A2012-11-08
JP2017125245A2017-07-20
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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