US3476549A - Process for casting of metal from a refining furnace into a ladle - Google Patents

Process for casting of metal from a refining furnace into a ladle Download PDF

Info

Publication number
US3476549A
US3476549A US597462A US3476549DA US3476549A US 3476549 A US3476549 A US 3476549A US 597462 A US597462 A US 597462A US 3476549D A US3476549D A US 3476549DA US 3476549 A US3476549 A US 3476549A
Authority
US
United States
Prior art keywords
metal
ladle
slag
casting
bath
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US597462A
Inventor
Ernest Glaesener
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Arcelor Luxembourg SA
Original Assignee
Arbed SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Arbed SA filed Critical Arbed SA
Application granted granted Critical
Publication of US3476549A publication Critical patent/US3476549A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D9/00—Machines or plants for casting ingots
    • B22D9/003—Machines or plants for casting ingots for top casting
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4653—Tapholes; Opening or plugging thereof
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material
    • C21C7/0043—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material into the falling stream of molten metal
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0068—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by introducing material into a current of streaming metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/14—Charging or discharging liquid or molten material

Definitions

  • the present invention relates to a process for casting metal, especially steel, from a refining furnace into a ladle, and is characterised by the feature, that any contact of the cast-metal jet with the surrounding air is prevented.
  • the present invention therefore concerns a process for casting metal with the object, that practically no change of the composition of the refined metal will take place during casting ,of' 'such metal from the refining furnace into the ladle
  • any access of air to the jet of cast metal is avoided by casting from the refining furnace takes place through a tube fixed to the tap hole of the refining furnace and reaching nearly to the bottom of the ladle used.
  • oxy dation of thev metal jet during the casting operation is completely made impossible. Maintenance of the metal composition, as it has beenrealised at the end of the refining operation, is therefore guaranteed during casting into the ladle.
  • the present invention there is no formation during casting of non-metallic inclusions, as will occur with known proceses due to oxydation by air of the metal jet and due to slag particles remaining in the metal 3,476,549 Patented Nov. 4, 1969 bath and not rising to the surface layer of slag.
  • the slag particles will first penetrate deep into the metal bath and will then rapidly rise to the surface of the bath, as their lower density much differs from the density of the molten metal. This is of great practical importance, since according to the invention no contamination of the refined metal can happen.
  • the addition of alloying and deoxydation agents also is carried out with a tube reaching to a certain depth into the metal bath and below its surface layer of slag.
  • This procedure is of great practical advantage, as such additives are often introduced into the ladle containing or being filled with refined metal, as for example liquid term-manganese. In this manner no oxydation or other undesired reaction with air of these additives is permitted.
  • the added agents will immediately and without alteration get in contact with the metal bath to be treated.
  • deoxydation can proceed more easily and alloying agents can directly act in their original state without being oxidyzed or otherwise altered with a risk of contamination for the refined metal. No reaction of these additives with the slag can take place, since the tube used for their introduction will reach beneath the surface layer of slag. As a result a better yield of alloy is made possible.
  • Another important advantage offered by the present invention is the fact that, when phosphoric anhydride is present in the slag, rephosphoration can practically be completely avoided, since there is no disturbance of the existing equilibrium.
  • the metal leaving the refining furnace 1 through tap hole 2 flows through casting tube 3 into the ladle 4 being placed on the transport car 5.
  • the lower part of the casting tube 3 almost reaches the bottom of the ladle and will therefore quickly be immersed into the: liquid-metal bath 7.
  • the tube 6 used for the introduction of alloying and deoxydation agents is plunged through the layer of slag 8 into the metal bath. If relatively heavy agents are to be added, as for example term-manganese in pieces, addition will be directly carried outthrough the tube used as such.
  • the tube used for their introduction is first closed at its lower end by means of a thin sheet and after having received the additives is plunged to a greater depth into the metal bath and immediately afterwards is slightly drawn back in order to leave the additives at such depth, after the sheet has been melted.
  • attention is to be paid to make sure that the tube remains immersed beneath the surface layer of slag.
  • the tube 3 used according to the invention can be made of a refractory material or of metaLAs a metal or metal alloy use can be made either of one being resistant to the bath at the temperature of the fluid metal bath or of one being melted at such temperature. In the latter case the metal has to be chosen in such a manner as to always keep the lower end of the tube beneath the surface of the metal bath in the ladle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Multimedia (AREA)
  • Manufacturing & Machinery (AREA)
  • General Engineering & Computer Science (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Description

Nov. 4, 1959 GLAESENER 3,476,549 PROCESS FOR CASTING 0F METAL FROM A REFINING FURNACE INTO A LADLE Filed NOV. 28, 1966 ERNEST GLAESENER I v\\ 'E.\"TOR GU Attorney United States Patent 3,476,549 PROCESS FOR CASTING'OF- METAL FROM A REFINING FURNACE INT-0 A LADLE Ernest Glaesener, Dudelange, Luxembourg, assignor to ARBED, Acieries Reuuies de Burbach-Eich-Dudelange,
S.A., Luxembourg, Luxembourg, a corporation of Luxembourg Filed Nov. 28, 1966, Ser. No. 597,462
Claims priority, application Luxembourg, Dec. 7, 1965,
Int. Cl. CZZc 33700,- B22d 11/10 US. (:1. 75-46 1 C laim The present invention relates to a process for casting metal, especially steel, from a refining furnace into a ladle, and is characterised by the feature, that any contact of the cast-metal jet with the surrounding air is prevented.
It is well known that the main object of the steelrefining process lies in obtaining a metal or alloy having a definite chemical composition. It is therefore quite important, that during casting of refined metal or steel no change in the chemical composition of such metal or alloy may occur, and that no contact of the metal with theoxygen of air should take place. The same is true for slag as particles of slag can be carried along with metal when cast. A change in the composition of slag means a disturbance of the equilibrium existing between refined metal and slag and brings about a change in the composition of metal as well.
According to the present invention no contact of the cast metal with the oxygen of air takes place and particles of slag can reach the bottom of the cast metal column, and 63111111611 easily and rapidly rise to the surface of the metal bath and facilitate decantation, since there exists a considerable diflerence between the density of metal and that. of slag.
The present invention therefore concerns a process for casting metal with the object, that practically no change of the composition of the refined metal will take place during casting ,of' 'such metal from the refining furnace into the ladle According to the present invention any access of air to the jet of cast metal is avoided by casting from the refining furnace takes place through a tube fixed to the tap hole of the refining furnace and reaching nearly to the bottom of the ladle used. In this manner, oxy dation of thev metal jet during the casting operation is completely made impossible. Maintenance of the metal composition, as it has beenrealised at the end of the refining operation, is therefore guaranteed during casting into the ladle. No change of composition due to slag carried along with the ,cast metal can occur, since the movement of suchslag particles through liquid metal takes place solely in the absence of air. According to the present invention any disturbance of the equilibrium prevailing at the end of the refining operation is therefore carefully avoided.
According to the present invention there is no formation during casting of non-metallic inclusions, as will occur with known proceses due to oxydation by air of the metal jet and due to slag particles remaining in the metal 3,476,549 Patented Nov. 4, 1969 bath and not rising to the surface layer of slag. According to the present invention the slag particles will first penetrate deep into the metal bath and will then rapidly rise to the surface of the bath, as their lower density much differs from the density of the molten metal. This is of great practical importance, since according to the invention no contamination of the refined metal can happen.
According to the present invention the addition of alloying and deoxydation agents also is carried out with a tube reaching to a certain depth into the metal bath and below its surface layer of slag. This procedure is of great practical advantage, as such additives are often introduced into the ladle containing or being filled with refined metal, as for example liquid term-manganese. In this manner no oxydation or other undesired reaction with air of these additives is permitted. The added agents will immediately and without alteration get in contact with the metal bath to be treated. According to the invention deoxydation can proceed more easily and alloying agents can directly act in their original state without being oxidyzed or otherwise altered with a risk of contamination for the refined metal. No reaction of these additives with the slag can take place, since the tube used for their introduction will reach beneath the surface layer of slag. As a result a better yield of alloy is made possible.
It is further very advantageous according to the present invention to add to the liquid metal relatively light alloying and deoxydation agents, as for example aluminum. According to known practice, additives with lower density will not always penetrate deeply enough into the metal bath and cannot therefor spread uniformly to give, a homogeneous product.
Another important advantage offered by the present invention is the fact that, when phosphoric anhydride is present in the slag, rephosphoration can practically be completely avoided, since there is no disturbance of the existing equilibrium.
The accompanying sole figure of the drawing is a schematic arrangement of a device to be used according to the present invention, in cross-section with the aid of the drawing the following example is given in order to better illustrate the invention.
The metal leaving the refining furnace 1 through tap hole 2 flows through casting tube 3 into the ladle 4 being placed on the transport car 5. The lower part of the casting tube 3 almost reaches the bottom of the ladle and will therefore quickly be immersed into the: liquid-metal bath 7. As soon as the surface of the bath in the ladle has reached a certain height, the tube 6 used for the introduction of alloying and deoxydation agents is plunged through the layer of slag 8 into the metal bath. If relatively heavy agents are to be added, as for example term-manganese in pieces, addition will be directly carried outthrough the tube used as such. In the case of additives with a lower density however, the tube used for their introduction is first closed at its lower end by means of a thin sheet and after having received the additives is plunged to a greater depth into the metal bath and immediately afterwards is slightly drawn back in order to leave the additives at such depth, after the sheet has been melted. When proceeding in this manner, attention is to be paid to make sure that the tube remains immersed beneath the surface layer of slag.
The tube 3 used according to the invention can be made of a refractory material or of metaLAs a metal or metal alloy use can be made either of one being resistant to the bath at the temperature of the fluid metal bath or of one being melted at such temperature. In the latter case the metal has to be chosen in such a manner as to always keep the lower end of the tube beneath the surface of the metal bath in the ladle.
a 3 4 What is claimed is: through said tube beneath the slag layer on the bath 1. A method of casting molten steel'from a refining" previously introduced into said ladle.
furnace containing a bath of the molten steel covered by a slag layer into a casting ladle for transportation away efe ences C ted from said refining furnace, comprising the steps of affix- 5 UNITED STATESKPATENTS ing a downwardly extending air-tight tube of refractory a 1 f 1 if. material in an air-tight manner in registry with a tap 16 hole formed in said furnace below the surface of the bath 2976587 3/1961 c a e T' 1 r of molten steel therein and below the slag layer above aussan 164-133 X said bath, and positioning said tube and said ladle such FOREIGN PATENTS that said tube opens into said ladle close to the bottom 228,418 g 1963 Austria" passing through said tube; and then completing the tapof the ladle and is trained on the bottom thereof; draining molten steel from said furnace through said tube into said DEWAYNE RUTLEDGE, Pf 111131 Y Examlnel' ladle with entrainment of some slag to form a rising bath WHITE, Assistant Examiner of molten steel in said ladle surmounted by a slag layer v accumulated from slag entrained with the molten steel 266 38 ping of the molten steel from said furnace into said ladle
US597462A 1965-12-07 1966-11-28 Process for casting of metal from a refining furnace into a ladle Expired - Lifetime US3476549A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
LU50017 1965-12-07

Publications (1)

Publication Number Publication Date
US3476549A true US3476549A (en) 1969-11-04

Family

ID=19724632

Family Applications (1)

Application Number Title Priority Date Filing Date
US597462A Expired - Lifetime US3476549A (en) 1965-12-07 1966-11-28 Process for casting of metal from a refining furnace into a ladle

Country Status (4)

Country Link
US (1) US3476549A (en)
BE (1) BE690302A (en)
LU (1) LU50017A1 (en)
NL (1) NL6616893A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4274622A (en) * 1979-01-11 1981-06-23 Kawasaki Steel Corporation Device for separating slag from molten bath
WO2000058680A1 (en) * 1999-03-31 2000-10-05 Norsk Hydro Asa A method and device for transferring metal
US6481489B1 (en) 1998-01-27 2002-11-19 Melvin A. Jones Reinforced casting

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2577764A (en) * 1949-11-04 1951-12-11 Air Reduction Desulfurization of ferrous metals
US2803861A (en) * 1955-05-10 1957-08-27 American Smelting Refining Pouring mechanism for casting molten metal and the like
US2976587A (en) * 1957-02-26 1961-03-28 Daussan Henri Jean Method and device for casting steels and other ferrous compounds in ingot moulds
AT228418B (en) * 1959-10-13 1963-07-10 Beteiligungs & Patentverw Gmbh Continuous caster

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2577764A (en) * 1949-11-04 1951-12-11 Air Reduction Desulfurization of ferrous metals
US2803861A (en) * 1955-05-10 1957-08-27 American Smelting Refining Pouring mechanism for casting molten metal and the like
US2976587A (en) * 1957-02-26 1961-03-28 Daussan Henri Jean Method and device for casting steels and other ferrous compounds in ingot moulds
AT228418B (en) * 1959-10-13 1963-07-10 Beteiligungs & Patentverw Gmbh Continuous caster

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4274622A (en) * 1979-01-11 1981-06-23 Kawasaki Steel Corporation Device for separating slag from molten bath
US6481489B1 (en) 1998-01-27 2002-11-19 Melvin A. Jones Reinforced casting
WO2000058680A1 (en) * 1999-03-31 2000-10-05 Norsk Hydro Asa A method and device for transferring metal

Also Published As

Publication number Publication date
BE690302A (en) 1967-05-02
LU50017A1 (en) 1967-06-07
NL6616893A (en) 1967-06-08

Similar Documents

Publication Publication Date Title
US3272619A (en) Apparatus and process for adding solids to a liquid
US3689048A (en) Treatment of molten metal by injection of gas
US3666449A (en) Method for the introduction of volatile additives into a melt
US3608621A (en) Continuous casting apparatus with controlled overflow casting tube in tundish
US3572671A (en) Continuous degassing of metals
US3321300A (en) Degassing of metals or alloys
US2993780A (en) Method for treating steel in vacuo
US3230074A (en) Process of making iron-aluminum alloys and components thereof
US3971655A (en) Method for treatment of molten steel in a ladle
US3718175A (en) Plant for continuous casting without deep casting stream penetration
US3476549A (en) Process for casting of metal from a refining furnace into a ladle
US3206301A (en) Process for the continuous treatment of steel
US4619443A (en) Gas distributing tundish barrier
RO79759A (en) METHOD FOR REFINING A CONVERTER CAST BATH
DE2205090A1 (en) Method and device for the treatment of molten metals
GB1271022A (en) Improved process for the continuous casting of steel
US3071458A (en) Method of adding charge material to molten metal under vacuum
US3145095A (en) Method and apparatus for continuously tapping and degassing molten metal into ingot molds
US1916042A (en) Apparatus for treating ingots
US3998261A (en) Casting steel ingots
US3380509A (en) Method of pressure treatment of metallic melts, especially steel melts
US3030203A (en) Process of producing steel
US2968847A (en) Skimmer apparatus for fluxing light metals
US2837800A (en) Casting of ferrous ingots
DE3369259D1 (en) Device for the metallurgical treatment of liquid metals