Title:
鋼の製造方法
Document Type and Number:
Japanese Patent JP7087725
Kind Code:
B2
Abstract:
To provide a manufacturing method of steel good in yield of REM and capable of reducing generation of inclusion defect due to alumina cluster.SOLUTION: There is provided a manufacturing method of a steel for manufacturing a killed steel by deoxidizing a tapped molten steel by Al or the like after tapping an un-deoxidized molten steel ingot by a converter into a ladle, in which an alloy for adjusting components containing oxygen is input into a molten steel with molten oxygen amount during or after tapping into the ladle and before deoxidization by Al or the like of 50 ppm or more as well as into the molten steel after deoxidization by Al or the like, (carried oxygen amount before deoxidization/carried oxygen amount after oxidization) is 2 or more, carried oxygen amount after deoxidization is 10 ppm or less, total of carried oxygen amount before deoxidization and carried oxygen amount after deoxidization is 15 ppm or more, one or more kind of REM is added to the molten steel which is deoxidized by Al or the like and then into which the alloy for adjusting components is input, and the molten steel to which the REM is added is stirred for time at 0.10 to 0.9 times of uniform mixing time.SELECTED DRAWING: Figure 6
Inventors:
Toshiaki Mizoguchi
Hayabusa Takekawa
Shintaro Oga
Hidenori Kurimoto
Hayabusa Takekawa
Shintaro Oga
Hidenori Kurimoto
Application Number:
JP2018121390A
Publication Date:
June 21, 2022
Filing Date:
June 26, 2018
Export Citation:
Assignee:
Nippon Steel Corporation
International Classes:
C21C7/06; B22D1/00; C21C7/04; C22C38/00; C22C38/60
Domestic Patent References:
| JP2005089774A | ||||
| JP2006192439A | ||||
| JP2005002420A | ||||
| JP2018034189A | ||||
| JP2009167463A | ||||
| JP2014109056A |
Attorney, Agent or Firm:
Patent Attorney Corporation Britus