Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1986-03-03
1987-04-28
Rosenberg, Peter D.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 58, 75257, C21C 702
Patent
active
046611517
ABSTRACT:
A treating agent of molten steel according to the present invention is used for desulfurization molten steel for desulfurizing it in a reaction vessel which is lined with a basic refractory containing MgO, and consists of CaO, CaF.sub.2 and MgO and unavoidable impurities contains from 10 to 60% by weight of MgO, and has a weight ratio of {(% CaF.sub.2)/((% CaO)+(% CaF.sub.2))}.times.100(%) of from 20 to 80%.
Said agent is injected with the aid of inert carrier gas into the molten steel and floats toward a portion of the molten steel bath essentially free of slag. Another treating agent essentially consisting of CaO and CaF.sub.2 may be also injected prior and/or subsequent to injection of said agent, so as to decrease inclusions. The inert gas may also be injected after injection of said agent(s).
REFERENCES:
patent: 3201292 (1965-08-01), Miltschitzky
patent: 3309194 (1967-03-01), Dunn
patent: 4097269 (1978-06-01), Holzgruber
patent: 4391633 (1983-07-01), Yamanchi
Aso Seiji
Endoh Koichi
Kaneko Toshiyuki
Obana Yasuo
Takahama Hideyuki
Nippon Steel Corporation
Rosenberg Peter D.
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