Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1984-09-12
1986-04-15
Rosenberg, Peter D.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 12, 75 45, C22B 400
Patent
active
045825319
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method of heating a molten steel in a tundish for a continuous casting apparatus. In general, the temperature of the molten steel first received in a tundish is extremely lowered through heat absorption of a refractory material of an inner lining, heat dissipation from a bath surface or the like. Consequently, a part of the cast sheet becomes poor in quality. Therefore, such a temperature drop must be compensated. For this purpose, the present invention is designed to meet the above requirement in such a manner that the above tundish is provided with a horizontal channel type induction heater by which the molten steel is circuitously introduced into the interior of the induction heater to be heated and then returned into the tundish under circulation.
BACKGROUND TECHNIQUE
In the continuous casting, the molten steel is poured into the tundish through a ladle, and undergoes a conspicuous temperature drop due to the heat dissipation from the poured flow, the heat absorption by the inner lining refractory material, and heat radiation from the surface of the bath.
As the ordinary technique which compensates such a temperature drop, there has been a technique disclosed in Japanese Patent Laid-Open No. 163,730/79 in which a vertical type induction heater adapted to vertically circulate the molten metal is attached for heating to the bottom wall of the molten metal storing container. However, since in the technique disclosed therein, the vertical type induction heater is used in the attached state to the bottom wall, it is difficult to use in a tundish for the continuous casting apparatus.
On the other hand, there has been heretofore proposed a technique by which a horizontal channel type induction heater is fitted to the side wall of the tundish, as disclosed in Japanese Patent Laid-Open No. 56,144/82. A skeleton view of the heater used in this technique is shown in FIGS. 1 and 2. The illustrated horizontal channel type induction heater 2 is fitted to the side wall of the tundish 1. The body of the induction heater 2 is constitued by disposing a refractory material 7 inside of a shell 6 defining the outer shell, and has a roundabout or circular channel 8 formed in a loop shape from the inlet port 8a to an outlet port 8b which are opened to the interior of the tundish 1 and a through hole 9 provided penetrating the central portion surrounded by the roundabout or circular channel 8 in a direction orthogonal to the flowing direction of the molten steel. In FIGS. 1 and 2, a reference numeral 3 denotes the location of a nozzle from which the molten steel is received, a reference numeral 4 an outflow port, and a reference numeral 5 a partition wall for guiding the molten steel flow, which is provided if necessary.
A primary induction coil 10 to generate an induction current i in the molten steel flow within the roundabout or circular channel 8 is assembled through insertion in the inside of the above through hole 9 via a core 10a. A magnetic field .phi. is produced in the core 10a when the primary induction coil 10 is energized, and the secondary induction current i is accordingly flown in the molten steel within the roundabout channel 8, so that a Joule's heat of i.sup.2 .multidot.R is produced to heat the molten metal. To put it into another words, the heater is so constituted that the molten steel passage as the roundabout channel 8 is provided to heat the molten steel during the roundabout or circular movement.
However, when this induction heater 2 is used, there have been often experienced that the intended heating of the molten steel may not be appropriately and smoothly performed depending upon the schedule of the power supply to the heater.
That is, when a normal rated electric power is constantly supplied to the coil 10 of the induction heater 2 in the heating of the molten steel, since air is often stayed in the roundabout channel 8 particularly in case that the stored amount of molten steel in the tundish is small, that is, in the initial stage of pourin
REFERENCES:
patent: 2415974 (1947-02-01), Tama
patent: 2446637 (1948-08-01), Crampton
patent: 2473311 (1949-06-01), Tama
patent: 2655550 (1953-10-01), Zvanut
patent: 3413113 (1968-11-01), Vogels
Habu Yasuhiro
Ueda Tsunehiro
Yamanaka Hiromitsu
Yoshii Yutaka
Kawasaki Steel Corporation
Rosenberg Peter D.
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