Title:
STEEL SHEET FOR HIGH-HEAT-INPUT WELDING AND MANUFACTURING METHOD FOR SAME
Document Type and Number:
WIPO Patent Application WO/2023/233853
Kind Code:
A1
Abstract:
The present invention provides a steel material with which it is possible to achieve excellent toughness in the HAZ near a fusion line subjected to high-heat-input welding. Provided is a steel sheet for high-heat-input welding, said steel sheet having a specific composition wherein: Ca, O, and S satisfy a prescribed relationship; C, Mn, Ni, Cu, Cr, Mo, and V satisfy a prescribed relationship; Ti and N satisfy a prescribed relationship; and the remainder has a component composition of Fe and unavoidable impurities; ferrite in a location at 1/4 of the steel sheet thickness is at least 60% in terms of volume fraction; of the ferrite, the volume fraction of processed ferrite is at least 30% and at most 95%; and the hardness of a ferrite crystal particle unit is at least 120 in terms of the Vickers hardness.
Inventors:
HIRAIDE TAKASHI (JP)
ARAO RYO (JP)
NAKASHIMA KOICHI (JP)
TACHIBANA SHUNICHI (JP)
ARAO RYO (JP)
NAKASHIMA KOICHI (JP)
TACHIBANA SHUNICHI (JP)
Application Number:
PCT/JP2023/015627
Publication Date:
December 07, 2023
Filing Date:
April 19, 2023
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; C21D8/02; C22C38/14; C22C38/58
Domestic Patent References:
| WO2021199629A1 | 2021-10-07 | |||
| WO2014155439A1 | 2014-10-02 | |||
| WO2023276516A1 | 2023-01-05 |
Foreign References:
| JP2010106310A | 2010-05-13 | |||
| JP2010159473A | 2010-07-22 | |||
| JP2008266735A | 2008-11-06 | |||
| JP2017155333A | 2017-09-07 | |||
| KR20090069872A | 2009-07-01 |
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
Download PDF:
Previous Patent: DETERMINATION DEVICE AND DETERMINATION METHOD
Next Patent: POLYAMIDE-IMIDE AND POLYAMIDE-IMIDE FILM
Next Patent: POLYAMIDE-IMIDE AND POLYAMIDE-IMIDE FILM