Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1974-02-21
1976-04-06
Rosenberg, Peter D.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
13 29, C21C 552, H05B 514
Patent
active
039486435
ABSTRACT:
Unrefined steel is refined by the use of a refining slag in a furnace having two pressure-tightly interconnected, pressure-tightly covered upper and lower hearths having channeltype inductors for heating and stirring steel melts in the hearths, the refining being effected in the upper hearth only and which is of relatively small capacity and has its inductor tilted to effect vigorous melt flow. The refining is continued, batch after batch, with each batch transferred to the lower hearth which is of substantially larger capacity and where the refined steel can be held at a temperature lower than required for its refining, to obtain a volume of refined steel adequate for steel plant casting purposes. Gas pressure in the lower hearth maintains the melt level in the upper hearth as required during the refining, this gas pressure being lowered to transfer each batch of refined steel to the larger lower hearth, and then being increased again for the next refining operation. Finally, for tapping the refined steel in the large lower hearth, the gas pressure is raised in the latter and the accumulated melt is forced through an appropriately positioned tap hole. The small capacity and tilted inductor of the upper hearth makes it possible to use the channel-type inductor for steel refinement with a reactive slag; the lower temperature required for holding the accumulated melt makes practical the use of the channel-type inductor in the case of the lower hearth of large enough capacity for steel plant casting.
REFERENCES:
patent: 2648715 (1953-08-01), Lillienberg
patent: 2674639 (1954-04-01), Stevenson
patent: 2936329 (1960-05-01), Tama
patent: 2939899 (1960-06-01), Edstrand
patent: 3467167 (1969-09-01), Mahin
Fredriksson Bengt
Uggla Jan
Allmanna Svenska Elektriska Aktiebolaget
Rosenberg Peter D.
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