Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1977-11-28
1980-04-15
Rosenberg, P. D.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 58, C21C 702
Patent
active
041982290
ABSTRACT:
A carbon-unsaturated molten metal or molten alloy containing elements more oxidizable than iron such as chromium and silicon is dephosphorized by addition of a flux composition comprising calcium carbide and a halide of alkali earth metal such as calcium fluoride in a non-oxidizing atmosphere, and thereafter the slag as a by-product is stabilized against formation of undesirable gases. This method when employed in refining ferrochromium or crude stainless steel makes feasible dephosphorization, and it is particularly suited for economical production of low phosphorus stainless steel.
REFERENCES:
patent: 3124450 (1964-03-01), Matuschkovitz
patent: 3622302 (1971-11-01), Hayashi
patent: 3876421 (1975-04-01), Takemura
patent: 3929464 (1975-12-01), Todd
patent: 4054445 (1977-10-01), Ramacciotti
Harashima Kazuumi
Inatomi Makoto
Ito Michihisa
Kajioka Hiroyuki
Katayama Hiroyuki
Nippon Steel Corporation
Rosenberg P. D.
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