Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1974-12-23
1977-03-29
Satterfield, Walter R.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 58, 75123R, 164 55, C21C 700
Patent
active
040146839
ABSTRACT:
Drawing Quality steel having low carbon, oxygen, and aluminum contents is produced through the use of continuous casting. After tapping steel of the lowest possible carbon content at 2,960.degree. F., predetermined amounts of manganese and aluminum are added to the ladle. The amount of manganese added is such that the manganese content at the conclusion of the process will be in the range of 0.20 to 0.35%. The amount of aluminum added is of small quantity for purposes of removing some of the oxygen from the steel to prevent boiling on refractories due to excessive oxygen; the aluminum added is consumed in deoxidation so that the aluminum content in the steel is not increased at that stage. After the addition of manganese and aluminum the steel is vacuum degassed. During vacuum degassing, predetermined amounts of carbon and aluminum which are mixed in briquette form are added at a predetermined, controlled rate to complete deoxidation. However, less aluminum is added to ensure that the aluminum content of the steel will be less than 0.023% and preferably less than 0.015%, thus enabling the steel to be continuously cast. The carbon is added to compensate for the decreased aluminum addition in the overall deoxidation process. However, the amount of added carbon is specifically limited so that after degassing the carbon content will still be less than 0.02%.
REFERENCES:
patent: 3368886 (1968-02-01), Muta et al.
patent: 3387967 (1968-06-01), Perry et al.
patent: 3412781 (1968-11-01), Richards
patent: 3459537 (1969-08-01), Hornak
patent: 3702243 (1972-11-01), Miltenberger
patent: 3792999 (1974-02-01), Ruttiger
patent: 3793000 (1974-02-01), Miltenberger
National Steel Corporation
Satterfield Walter R.
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