Title:
Manufacturing method of high cleanliness steel
Document Type and Number:
Japanese Patent JP6314911
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To produce steel of high cleanliness by controlling slag composition upon ladle refining to an optimum range in production of high cleanliness steel by using ladle refining equipment and vacuum degasification equipment .SOLUTION: A method of producing high cleanliness steel is provided for producing the high cleanliness steel by conducting ladle refining on molten steel tapped from a converter in ladle refining equipment and conducting vacuum degasification refining in vacuum degasification equipment. In the method of producing high cleanliness steel, a slag composition upon the ladle refining is controlled in such a way that (mass%CaO)/(mass%SiO) is in the range of 4.0 to 6.3, (mass%CaO)/(mass%AlO) is in the range of 1.8 to 2.3 and (mass%CaO)/(mass%SiO) and (mass%CaO)/(mass%AlO) satisfy following (1) formula. 0.0059×(mass%CaO)/(mass%SiO)+0.028×(mass%CaO)/(mass%AlO)≤0.088 (1).SELECTED DRAWING: Figure 1
Inventors:
Akitoshi Matsui
Akira Harada
Seiji Nabeshima
Tomoaki Seo
Yuji Miki
Akira Harada
Seiji Nabeshima
Tomoaki Seo
Yuji Miki
Application Number:
JP2015108341A
Publication Date:
April 25, 2018
Filing Date:
May 28, 2015
Export Citation:
Assignee:
jfe Steel Corporation
International Classes:
C21C7/00; C21C7/076; C22C38/00; C22C38/18
Domestic Patent References:
| JP2012132094A | ||||
| JP2006137973A | ||||
| JP2010116610A | ||||
| JP2009197285A | ||||
| JP2013177666A | ||||
| JP2012241229A |
Attorney, Agent or Firm:
Shigeru Inoue
Kazuhiro Mori
Kazuhiro Mori