Title:
Desulfurization method of molten steel
Document Type and Number:
Japanese Patent JP6323688
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a desulfurization method of molten steel capable of achieving high desulfurization efficiency when conducting desulfurization using a fluorine-less desulfurization agent in a vacuum degassing step.SOLUTION: The desulfurization method of molten steel is provided in which when the molten steel is refined by: heating powder supplied through a top-blowing lance arranged in vacuum degassing equipment, using burner flame formed at a tip of the top-blown lance ; and spraying the powder onto a bath surface of the molten steel in a degassing tank, a premix flux is used as the powder, the premix flux having a composition of CaO and AlOsatisfying 1.2≤(CaO)/(AlO)≤4.0 and the premix flux having a form of a mixture with the CaO powder and the AlOpowder.SELECTED DRAWING: Figure 1
Inventors:
Fujii Yusuke
Yue Nakai
Yuichi Uchida
Naoya Shibuda
Kotaro Tanaka
Yuji Miki
Yue Nakai
Yuichi Uchida
Naoya Shibuda
Kotaro Tanaka
Yuji Miki
Application Number:
JP2015144617A
Publication Date:
May 16, 2018
Filing Date:
July 22, 2015
Export Citation:
Assignee:
jfe Steel Corporation
International Classes:
C21C7/064; C21C7/076; C21C7/10
Domestic Patent References:
| JP2010111940A | ||||
| JP2008063647A | ||||
| JP2012184501A | ||||
| JP10025512A |
Foreign References:
| WO1997008348A1 |
Attorney, Agent or Firm:
Ginza Marronnier Patent Office