Method and apparatus for producing high chromium content steels

Details Method and apparatus for producing high chromium content steels Method and apparatus for producing high chromium content steels

1998-06-25

2000-05-30

Willis, Prince

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 1064, 75 1066, C21B 1312

Patent

active

060686766

ABSTRACT:
A method and an apparatus for producing steels with predominantly high Cr content and/or ferro-alloys, wherein the metal charge is melted in a melting crucible, is alloyed, refined and reduced, and wherein process gases are simultaneously supplied through bottom nozzles. A melting crucible is used with a specific reaction volume of 0.4 to 1.5 m.sup.3 /t steel and the injection rates of the process gases are controlled in the range of 0.1 to 3.0 N m.sup.3 /t/min. The solid charge material is melted by an electric arc and air
itrogen are injected simultaneously and, after forming a liquid sump, a gas mixture of oxygen and inert gas is injected. After adding slag-forming constituents and alloying agents, the oxygen throughput is increased and the power of the electric arc is reduced accordingly. The oxygen throughput is reduced in relation to the inert gas during refining and decarburization takes place as a result of increasing the electric arc with low chromium slag formation. During the reduction of the melt with suitable reduction agents, primarily chromium is reduced from the slag and silicon is bound by slag-forming constituents.

REFERENCES:
patent: 4090869 (1978-05-01), Antoine et al.
patent: 4749408 (1988-06-01), Tate et al.
patent: 5177763 (1993-01-01), Takashita et al.
patent: 5395420 (1995-03-01), Masucci

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