Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1984-08-21
1987-01-20
Godici, Nicholas P.
Metal founding
Process
Shaping liquid metal against a forming surface
164504, 164472, B22D 2702, B22D 1116
Patent
active
046374531
ABSTRACT:
A method for the continuous production of cast steel strands which are 200 mm.times.200 mm or less in cross-section by a continuous casting process in which molten steel containing 0.20% or less of carbon is fed into a casting mold with a lubricant through a submerged nozzle or in an open stream and continuously drawn out downwardly of the casting mold. The method includes the steps of (a) electromagnetically stirring the molten steel at a position within said casting mold by the application of a magnetic field induced by introducing into an electromagnetic coil an alternating current of a frequency (f) in the range of 1.5 to 15 hertz and maintaining the magnetic flux density (Gaub) in the range of 602e.sup.-0.10f to 2441e.sup.-0.11f at the center of the electromagnetic coil, and (b) electromagnetically stirring the molten steel at a position in the final solidifying zone, of said continuously cast strand, in which the shorter diameter of the molten steel pool is smaller than 1/2 the length of the shorter side of the cast strand, by the application of a magnetic field induced by introducing an alternating current into an electromagnetic coil and maintaining the magnetic flux density (Gaub) in the range of 0.2.multidot.D.sup.2 +280 to 0.343.multidot.D.sup.2 +451 at the center of the electromagnetic coil, wherein D is the solidified shell thickness in millimeters of said continuously cast strand, the value of D ranging from 20 to 90. The method thereby permits the production of low carbon killed steel billets which are improved as to negative segregations, center cavities, inclusions, surface quality, cold forgeability, and machinability, by a continuous casting process at low cost.
REFERENCES:
patent: 3656537 (1972-04-01), Von Starck
patent: 4515203 (1985-05-01), Narita et al.
Ayata Kenzo
Fujimoto Takahiko
Mori Takasuke
Narita Kiichi
Godici Nicholas P.
Heinrich Samuel M.
Kabushiki Kaisha Kobe Seiko Sho
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