Секційний кристалізатор електрошлакових установок

United States Patent ti5i 3,677^23 [45} July 18,1972 Wahlster et al. t54] PROCESS AND APPARATUS FOR PROVIDING STE£L INGOT 2,709,842 6/1955 Findlay [72] Inventors: MsBfired Wabbter, Bochum-Stiepel; Alok Cboudhury, Hattingen, both of Germany Primary Examiner—}, Spencer Overhober Assistant Examiner—John E Roethel Attorney—McOlew and Toren [73] Assignee: RbdnstahJ Huttenwerice A.G., Essen, Germany [57] 164/252 [221 Filed: Nov. 17,1969 [21J Appl. No.: 877,371 [30] Foreign Application Priority Data Nov. 22, 1968 Germany [52] U.S.a [51) Int,Ci [58] Fieldof Search [56] P 18 10 371.4 164/52,164/252 322d27/02 164/52,252 Refennces Cited UNiTED STATES PATENTS 2,369.233 2/1945 3,344,839 10/1967 3,550,259 12/1970 3,129,473 4/1964 Hopkins Sunnen Smith Veil 164/252 X 164/52 164/52 X 164/252 ABSTRACT A process for the production of a steel ingot of small cross sections comprises forming the ingot within the lower end of a пюШ which has a head portion which widens out in a conical configuration at its upper end and which carries in its conical poruon a slag bath. A consuming electrode is dipped into the slag bath and it melts down in drops due to the passage of cur­ rent and solidifies in the continuous casting mold at the top of the ingot The electrode is moved at a speed such that it ap­ proaches the mold at a speed to lemain immersed with its full crces section in the slag and so that the solid as well as the liquid parts of the ingot are present only in the lower part of the mold. The apparatus for carrying out this process includes a mold having a lower end of uniform cross section and an upper outwardly flaring conical end. The walte of the conical portion have an opening angle of between 60° and 120*^ and preferably 90" and this is sufficient to contain a slag bath to permit the electrode c^ a larger diameter than the ingot to be lowered into the bath with itsfiillcross section. 1 Claim, 3 Drawing F^ures PATENTED Ж І 8 |97P 3.677:323 SHEET 1 OF 3 46 12b 12 Fig.: 1 INVENTOIL Jcc^feu/% The wnonuBVi: 3.677,323 PATENTED Ж181972 SHEEI г OF З Fig.: 2 INVENTOK ^ ДУ RLOK CHOUGHWR/ J PATENTED JUL 181972 3.677,323 SHEET 3 OF 3 INVENTOR ^ ДУ ntoK CHouajNuny 1 3,677,323 PROCESS AND APPARATUS FOR PROVIDING STEEL INGOT SUMMARY OF THE INVENTTGN 2 cross section which includes a mold having a portion comparable to the cross section of the ingot to be formed and a widened upper conical portion for receiving в slag bath, with mold and for msertmg a consumable electrode at a rate of speed to cause the melting thereof in the slag and the engagement of the entire cross section in the slag; the moid including means for cooling the formed ingot as it is withdrawn in order that the solid and liquid phase of the withdrawn ingot exists only at the lower part of the mold having the cross section of the ingot. A further object of the invention is to provide a continuous cast mold which is simple in design, nigged in construction, ,c ^^d economical to manufacture. The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this specification. For a better understanding of the invention, its operating advantages and 20 specific objects attained by its use, reference should be had to the accompanying drawings and descriptive matter in which there are illustrated and described preferred embodiments of the invention, This invention relates in general to a metallurgical process and apparatus and in particular to a new and useful device for the production of steel ingot of small cross section by electrode slag remelting. The invention is particularly applicable to the production of steel ingots of small cross section. In the known process of electro slag remelting, self consuming electrodes are melted in a water cooled mold which has a greater diameter than the electrode. The melting takes place by the passage of current between the electrode and a liquid slag into which the electrode is immersed and the ingot solidifies in the mold. The steel particles melted down from the electrode under the action of the passage of the current fall in the form of drops through the liquid slag bed and into the liquid pool in the head of the solidified ingot Because the draw off of the solidified ingot is very slow compared with the continuous casting of the liquid steel, the liquid pool in the ingot head is very shallow and very pure ingots free from segregation and are formed. Because of the dense structure, the ingots produced in the 25 BRIEF DESCRIPTION OF THE PREFERRED electro slag remeit process require very little transformation EMBODIMENTS to obtain a faultless material fit for technologically high grade i„ ^g drawings: purposes. It is inherent in the electro slag remeit process, howpiQ 1 jg ^ schematic longitudinal section of a continuous ever, that only ingots can be produced which have a diameter casting mold constructed in accordance with the invention; greater than the elecUodes used for remelting. This leads to 30 H G . 2 is a view similar to FIG. 1 but indicating additions at expensive reshapmg of large ingots by rolling or forging and the start up of the operation and before production is fiilly efthis is especially so for the production of objects of smalt cross fected' and sections such as axles, shafts or wires. Reduction of the cross H G ! 3 is a view simUar to FIG. 2 of another arrangement for section of the electrodes produced by casting merely shifts the (jjg starting up operation, shaping work from the remelted products, the ingot, to the ^^ product still to be remelted and will also lower the degree of GENERAL DESCRIPTION OF THE PREFERRED utilization of the remelting plant. EMBODIMENTS An object of the present invention is to develop an « - . . . . . . . . . economicprocessfortheproductionofaningotofsmallcross , Rffening to the drawing m particular, the mvention emsection, m accordance with the invention, the steel ingot is re- ^0 bodied therem, as mdicated ш FIG. I . includes an apparatus melted by means of the electro slag remelting process, which ^"'^ ""^^"^ ^°г ^°™"8 ^ continuous mgot 1 of relaUvely is known in itself and from an electrode having a greater cross ^mall cross section which is formed by the remelting from an section than that of the ingot. The electrode immerses into a electrode 2 of a larger cross section than that of the ingot by slag bath and melts down in drops due to the passage of cur- . _ *be electro slag remeit process. The electrode 2 is indicated in rent and then solidifies in a continuous casting mold which ^^ » production position in which its fuU cross section ia impresents at the head of its lower part the same interior section mersed in a slag bath 3. The electrode 2 melts down and drops as that of the ingot. The upper part of the continuous casting '^"« to *he evolution of heat upon the passage of current mold is widened in a funnel like a conical form to provide an through tiie slag 3 and its solidifies in a continuous casting area at least as great as that of the cross section of tiie elec- , „ «"o'd generally designated 4. trode. The funnel is filled with slag to the extent that its sur*" accordance with the invention, the continuous casting face corresponds at least to the full cross section of the elec^°^