Title:
HOT-ROLLED STEEL SHEET FOR COILED TUBING, AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2019/146458
Kind Code:
A1
Abstract:
Provided are: a hot-rolled steel sheet for coiled tubing, the hot-rolled steel sheet being such that the yield strength is 480 MPa or higher, the tensile strength is 600 MPa or higher, the difference (ΔYS) between the yield strength after performance of a pre-distortion load heat treatment that simulates a present production step and a distortion-removal-annealing heat treatment and the yield strength before performance of the pre-distortion load heat treatment is 100 MPa or greater, and the yield strength after performance of the pre-distortion load heat treatment is 620 MPa or higher; and a method for manufacturing the hot-rolled steel sheet for coiled tubing. A steel slab composed of a prescribed component composition is heated to a temperature of 1100-1250°C, inclusive, after which rough rolling is performed; finishing rolling is then performed at a rolling completion temperature in the range of 820-920°C, inclusive; and immediately after the steel slab is cooled to a temperature of 600°C or less at an average cooling rate of 30-100°C/s, inclusive, at a plate-thickness center, the steel slab is wound in a temperature range of 450-600°C, inclusive, thereby producing a hot-rolled steel sheet for coiled tubing.
Inventors:
KIMURA HIDEYUKI (JP)
KAWAMURA SHUJI (JP)
SUGIMOTO ICHIRO (JP)
ASAI MAKOTO (JP)
YOKOTA TAKESHI (JP)
KAWAMURA SHUJI (JP)
SUGIMOTO ICHIRO (JP)
ASAI MAKOTO (JP)
YOKOTA TAKESHI (JP)
Application Number:
PCT/JP2019/000995
Publication Date:
August 01, 2019
Filing Date:
January 16, 2019
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; C21D9/46; C22C38/58
Domestic Patent References:
| WO2017130875A1 | 2017-08-03 | |||
| WO2013108861A1 | 2013-07-25 | |||
| WO2012133558A1 | 2012-10-04 |
Foreign References:
| JP2016148096A | 2016-08-18 | |||
| JPH06256845A | 1994-09-13 | |||
| CN102953017A | 2013-03-06 | |||
| JP5494895B2 | 2014-05-21 | |||
| JP2014208888A | 2014-11-06 |
Other References:
"Quantitative Analysis for Solid Solution Content of the Microalloy Elements in Steel", TETSU-TO-HAGANE, vol. 99, no. 5, 2013
See also references of EP 3722449A4
See also references of EP 3722449A4
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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