Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1977-07-26
1979-04-10
Rosenberg, P. D.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 60, C21C 530
Patent
active
041486293
ABSTRACT:
Process for controlling a steel refining process for steels having a carbon content within the range of 0.1-0.8 percent by weight, in which the desired final carbon content of the metal bath and the final temperature of the metal bath at the end point of the blowing period are being directly piloted or controlled or headed for, characterized in that the blowing period is being subdivided into three immediately successive stages during each of which the amount of blowing oxygen supplied is maintained constant, thereby selecting the duration of the first blowing period essentially in dependence on the pig iron analysis and on the oxygen flow and making said duration longer with higher Si-and-Mn-content and making said duration shorter with higher oxygen flow, whereupon at the end of this first blowing stage, the oxygen blowing lance is being lowered in an oxygen surface blowing process, noting that all additional materials, such as lime, ore and fluxes, are being added up till the end of this first blowing stage and lime is added in such an amount which, under consideration of the constant oxygen flow at the end of the second blowing period having its duration determined by the oxygen flow and being made shorter with higher oxygen flow, results in saturation of the slag in lime and, respectively, dicalciumsilicate, thereby piloting or heading for a slag basicity of at least 2.8 and a minimum amount of slag of 50 kg/ton of pig iron and maintaining a maximum P-content of 0.04 percent by weight within the crude steel and a minimum Mn-content of 0.2 percent by weight within the crude steel, whereupon in an oxygen blowing process, the lance position is again changed at the end of this second blowing stage, and in that the duration of the subsequent third blowing stage is, under consideration of the constant oxygen flow, selected in dependence on the desired final carbon content and the desired final temperature of the metal bath, noting that for producing steels of higher carbon content refining of the charge is being stopped already during the second blowing stage.
REFERENCES:
patent: 3551140 (1970-12-01), Nilles
patent: 3594155 (1971-07-01), Ramachandran
patent: 3619174 (1971-11-01), Fujii
patent: 3669645 (1972-06-01), Oishi
patent: 3773495 (1973-11-01), Nilles
patent: 3832160 (1974-08-01), Bishop
patent: 3847593 (1974-11-01), Ramacciotti
Rosenberg P. D.
Vereinigte Osterreichische Eisen- und Stahlwerk-Alpine Montan
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