Specialized metallurgical processes – compositions for use therei – Processes – Producing or treating free metal
Patent
1988-11-14
1990-04-24
Rosenberg, Peter D.
Specialized metallurgical processes, compositions for use therei
Processes
Producing or treating free metal
75532, 75533, C21C 700
Patent
active
049197142
ABSTRACT:
Disclosed are an improved method of refining steel and an apparatus for practicing the method.
The refining method comprises, basically, carrying out the refining, particularly, decarburization, while stirring molten steel in the refining furnace by injecting gas thereinto, while supplying heat with a burner installed at the top of the furnace to the molten steel. According to this method, it is possible to start at an initial carbon content of the moltend steel lower than that of known AOD process, and complete the refining in a curtailed period of time and with a decreased oxidation loss of Cr. Thus, damage of refractory materials of the furnace is reduced, and the amount of Si necessary for reducing Cr-oxides in the latter stage of the refining is also reduced.
Oxygen for the decarburization is supplied usually in the form of gas, but can be supplied from a solid oxygen source. In an alternative of the present method, powdery metal oxide, which is reducable equally to or more easily than Cr-oxides, is shot into the furnace through the burner or injected into the molten steel through a tuyere or an immersed lance.
Preferably, the burner is of a type of variable flame length. Use of the burner disclosed here makes it possible to lengthened the flame at the former stage of the refining so that not only heat but also oxygen may be supplied to the molten steel surface of promoting the decarburization, and to shorten the flame at the latter stage of the refining so that only heat may be supplied.
REFERENCES:
patent: 3953199 (1976-04-01), Michaelis
patent: 4195985 (1980-04-01), Brotzmann
Fujita Senji
Inagaki Yoshio
Ishii Atsushi
Mizuguchi Keiichi
Nakata Hiroya
Daido Tokushuko Kabushiki Kaisha
Rosenberg Peter D.
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