US3908735A - Method and device for the continuous casting of killed steel with artificial wildness - Google Patents

Method and device for the continuous casting of killed steel with artificial wildness Download PDF

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US3908735A
US3908735A US366428A US36642873A US3908735A US 3908735 A US3908735 A US 3908735A US 366428 A US366428 A US 366428A US 36642873 A US36642873 A US 36642873A US 3908735 A US3908735 A US 3908735A
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steel
mold
ingot
cast
inert gas
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Candia Armando Di
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal

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  • said superficial defects are often caused by the non-metallic inclusions which, during the continuous casting, are imprisoned within the first portions of steel which hardens in contact with the cooled walls of the ingot mould. Failing particular devices avoiding the above mentioned disadvantages, the products of the continuous casting which are to be used in the manufacture of formed sheet material, where said superficial defects are more dangerous, are usually subjected to operations of total flooding, performed by hand or through suitable devices, so as to remove said superficial defects.
  • the present invention aims at removing the disadvantages set forth above.
  • Said blowing of an inert gas, preferably consisting of argon, under the bath surface is obtained through at least a submerged head lance arranged so that the blowing gas may be directed toward the steel wall which is hardening, so as to convey the steel flow in the same direction and remove said dangerous inclusions by making them float on the bath surface wherefrom they may be easily removed.
  • an inert gas preferably consisting of argon
  • a device suitable to embody the above method comprising an ingot mould for the continuous casting and includes at least a lance for blowing an inert gas under the bath surface, whose nozzles are arranged so as to direct the interface between the steel flow towards the steel which is hardening and the still liquid steel.
  • the solution found was to feed said inert gas through a plurality of conduits formed in the thickness of the ingot mould wall.
  • the conduits may be of copper or other materials.
  • a device suitable to embody such a variation comprises an ingot mould for the continuous casting which includes. at least through its long walls, a series of passages suitable to feed an inert gas under pressure, under the bath surface.
  • said passages passing through the wall of the ingot mould for the continuous casting have their inner end. i.e.. the one directed towards the ingot mould. inclined upwards. and further have a preferablycircular cross section.
  • said passages according to a modified embodiment, have a slot-like elongated section. with its larger size horizontal, vertical or inclined.
  • said passages are obtained through the use of porous materials suitably provided on the copper ingot mould.
  • FIG. 1 is a diagrammatic vertical section, along line [-1 of FIG. 2 of an ingot mould for the continuous casting, provided with the device suitable to embody the claimed method;
  • FIG. 2 is a plan view of the ingot mould shown in FIG. 1;
  • FIG. 3 is a horizontal cross section of an ingot mould for the continuous casting, improved according to the invention.
  • FIG. 4 is a vertical cross section of said ingot mould along line IVIV of FIG. 3;
  • FIGS. 5 and 6 show an embodiment having an ingot mold with porous side walls.
  • the steel coming from a suitable container (not shown) is led to a discharger I and. through its outlet ports 2, is fed in to an ingot mold 3.
  • the outlet ports 2 may be arranged at different angles with respect to the discharger axis, and also according to the width of the product to be cast.
  • the steel coming from said discharger is hit by a blow of inert gas blown through one or tubular lances 4. whose position is shown in the figures by way of example only, arranged so as to cause a motion in the steel in the upper part of said ingot mould, in order to achieve the invention object.
  • a controlled turbulence is obtained and an agitation in the upper part of said ingot mould along whose perimeter is formed a substantially continuous wave 5.
  • Said motion prevents the non-metallic material from concentrating on the interface between the steel which is hardening and the still liquid steel. Further, said motion, owing to the continuous washing of the surface of the hardening steel. decreases the tendency of the nonmetallic inclusions to be imprisoned therein. Said motion is similar to the one obtained during the treatment of wild steel cast in the traditional ingot mould.
  • the steel coming from a suitable container passes through a discharger 101 and, through its outlet ports. is conveyed into an ingot mould 103; according to the embodiment shown in FIGS. 1 and 2, said outlet ports may be arranged according to different angles with respect to the discharger axis and according to the width of said ingot mould.
  • said discharger may be omitted, in such a case. the molten metal coming from said suitable basket is discharged directly into the ingot mould.
  • the steel poured into said ingot mould is hit by the blows ofinert gas coming from conduits 104, whose position is shown in the figures by way of example only. which may be obtained through the use of porous materials suitably provided on said ingot mould.
  • Said conduits are arranged in the ingot mould wall so i as to cause a motion in the molten steel in the upper part of said ingot mould; said motions in the molten steel have the purpose of carrying, together with the stream of neutral gas. the possible inclusions towards the bath surface. preventing them from being imprisoned within the steel layer which is getting hard on the lower parts of the inner wall of said ingot mould.
  • a controlled turbulence and an agitation are obtained in the upper part of said ingot mould, therefore.
  • a substantially continuous wave 105 is formed along the perimeter of said ingot mould.
  • Such a motion prevents the non-metallic material from concentrating at the interface between the hardening steel and the still liquid steel. Further. said motion owing to the continuous washing of the surface of the steel getting hard, decreases the tendency of the inclusions to be imprisoned therein. Such a motion is similar to the one obtained during the treatment of the wild steel cast in the traditional ingot moulds.
  • the conduits 104, passing through the ingot mould wall, are preferably inclined upwards so as to facilitate streams of liquid metal tending to form a peripheral continuous wave 105.
  • the cross section of said nozzles may be constant or variable within the thickness of the ingot mould wall, according to principles known per se, for obtaining in each case. the best efficiency of the gaseous blow entering the fluid metal. Said gas may be also made to pass through porous materials suitably provided on the copper ingot mould.
  • Conduits 104 may be provided also only in the long walls of said ingot mould. In the same way. said conduits 104 may be in the form of a horizontal, vertical or inclined slot.
  • FIG. 5 shows a mold similar to FIG. 4, however. the conduits 104 for the inert gas have been replaced by mold walls which are sufficiently porous to permit the inert gas to travel through the walls.
  • FIG. 6 shows a porous wall portion of a mold on an enlarged scale.
  • melt discharging nozzle closed at its lower end and reaching downwardly into the mold substantially intermediate said short mold side walls, said melt discharging nozzle having two substantially horizontally directed melt discharging openings adjacent to said lower end of said nozzle, each of said melt discharging openings facing its respective short side wall.
  • the improvement comprising means in said side walls of the mold for injecting an inert gas into the molten metal just under the top surface of the ingot being cast, and above the layer of steel hardening on the inner surface of the mold walls for creating a continuous wave in the surface of an ingot being cast, whereby impurities are continuously washed to the surface and thus prevented from concentrating at the interface between the hardening steel and the still liquid steel.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The invention has for its object a method and device for the continuous casting of killed steel with artificial wildness.

Description

United States Patent 1191 Di Candia I METHOD AND DEVICE FOR THE CONTINUOUS CASTING OF KILLED STEEL WITH ARTIFICIAL WILDNESS [75] Inventor: Armando Di Candia, Genoa, Italy [73] Assigncc: Italsider S.p.A., Genoa. Italy {22 Filed: June 4, I973 [211 Appl. No.: 366,428
[30] Foreign Application Priority Data June 6, 1972 Italy 12706/72 Aug. 22, 1972 Italy 12857/72 [52] US. Cl 164/66; 164/281 [51] Int. Cl. B22D 11/10 [58] Field of Search 164/66, 134, 259, 281
[56] References Cited UNITED STATES PATENTS 3.208.117 9/1965 Goedecke et :11 164/134 X 1451 Sept. 30, 1975 6/1970 M1115 et al. Q. 164/134 x 12/1973 Paton et a1 164/52 FOREIGN PATENTS OR APPLICATIONS 3,816,609 9/1963 Japan 164/66 1,916,919 10/1970 Germany ..164/66 Primary E.\'aminerFrancis S. Husar Assistant Examiner-John E. Roethel Attorney, Agent, or I-irmWolfgang G. Fasse; Willard W. Roberts 5 7 ABSTRACT The invention has for its object a method and device for the continuous casting of killed steel with artificial wildness.
4 Claims, 6 Drawing Figures METHOD AND DEVICE FOR THE CONTINUOUS CASTING OF KILLED STEEL WITH ARTIFICIAL WILDNESS BACKGROUND OF THE INVENTION It is known that in a continuous casting of killed steel the non-metallic inclusions. caused by the erosions of the refractories, by the chemical reactions occurring in the metallurgic processes of manufacture. treatment and solidification, by the oxidation caused by the atmospherical agents (particularly if aluminium in the metal phase is present in the steel) are often the reason of the superficial defects appearing on the surface of sheet material made of the products of said continuous casting.
It was particularly shown that, as the relevant technical literature teaches, said superficial defects are often caused by the non-metallic inclusions which, during the continuous casting, are imprisoned within the first portions of steel which hardens in contact with the cooled walls of the ingot mould. Failing particular devices avoiding the above mentioned disadvantages, the products of the continuous casting which are to be used in the manufacture of formed sheet material, where said superficial defects are more dangerous, are usually subjected to operations of total flooding, performed by hand or through suitable devices, so as to remove said superficial defects.
OBJECT OF THE INVENTION In view of the foregoing, the present invention aims at removing the disadvantages set forth above.
SUMMARY OF THE INVENTION According to the method of the invention for the continuous casting of killed steel, in the upper zone of the ingot mould an artificial wildness is caused by blowing an inert bath under the gas surface.
Said blowing of an inert gas, preferably consisting of argon, under the bath surface is obtained through at least a submerged head lance arranged so that the blowing gas may be directed toward the steel wall which is hardening, so as to convey the steel flow in the same direction and remove said dangerous inclusions by making them float on the bath surface wherefrom they may be easily removed.
A device suitable to embody the above method, of the kind comprising an ingot mould for the continuous casting and includes at least a lance for blowing an inert gas under the bath surface, whose nozzles are arranged so as to direct the interface between the steel flow towards the steel which is hardening and the still liquid steel.
In order to form an efficient gas stream within the upper zone of the ingot mould, according to a variation of the invention, it is suggested to increase the number of the outflow ports for said inert gas. Where it is not possible to increase the number of the lances extending from above into the liquid bath surface, the solution found was to feed said inert gas through a plurality of conduits formed in the thickness of the ingot mould wall. The conduits may be of copper or other materials.
A device suitable to embody such a variation comprises an ingot mould for the continuous casting which includes. at least through its long walls, a series of passages suitable to feed an inert gas under pressure, under the bath surface.
According to a particular embodiment ofsaid device. said passages passing through the wall of the ingot mould for the continuous casting. have their inner end. i.e.. the one directed towards the ingot mould. inclined upwards. and further have a preferablycircular cross section.
Further. said passages. according to a modified embodiment, have a slot-like elongated section. with its larger size horizontal, vertical or inclined.
According to a particular embodiment, said passages are obtained through the use of porous materials suitably provided on the copper ingot mould.
Finally. the above passages passing through the ingot mould wall have a variable cross section along the thickness of said ingot mould.
BRIEF DESCRIPTION OF THE DRAWINGS In order that the invention may be clearly understood it will now be described, by way of example only. with reference to the accompanying drawings. wherein:
FIG. 1 is a diagrammatic vertical section, along line [-1 of FIG. 2 of an ingot mould for the continuous casting, provided with the device suitable to embody the claimed method;
FIG. 2 is a plan view of the ingot mould shown in FIG. 1;
FIG. 3 is a horizontal cross section of an ingot mould for the continuous casting, improved according to the invention;
FIG. 4 is a vertical cross section of said ingot mould along line IVIV of FIG. 3; and
FIGS. 5 and 6 show an embodiment having an ingot mold with porous side walls.
DESCRIPTION OF THE PREFERRED EMBODIMENTS With particular reference to FIGS. 1 and 2, the steel coming from a suitable container (not shown) is led to a discharger I and. through its outlet ports 2, is fed in to an ingot mold 3. The outlet ports 2 may be arranged at different angles with respect to the discharger axis, and also according to the width of the product to be cast.
The steel coming from said discharger is hit by a blow of inert gas blown through one or tubular lances 4. whose position is shown in the figures by way of example only, arranged so as to cause a motion in the steel in the upper part of said ingot mould, in order to achieve the invention object.
Through the injection of an inert gas, preferably argon, a controlled turbulence is obtained and an agitation in the upper part of said ingot mould along whose perimeter is formed a substantially continuous wave 5. Said motion prevents the non-metallic material from concentrating on the interface between the steel which is hardening and the still liquid steel. Further, said motion, owing to the continuous washing of the surface of the hardening steel. decreases the tendency of the nonmetallic inclusions to be imprisoned therein. Said motion is similar to the one obtained during the treatment of wild steel cast in the traditional ingot mould.
With particular reference to FIGS. 3 and 4: the steel coming from a suitable container (not shown) passes through a discharger 101 and, through its outlet ports. is conveyed into an ingot mould 103; according to the embodiment shown in FIGS. 1 and 2, said outlet ports may be arranged according to different angles with respect to the discharger axis and according to the width of said ingot mould.
According to a modified embodiment, said discharger may be omitted, in such a case. the molten metal coming from said suitable basket is discharged directly into the ingot mould.
The steel poured into said ingot mould is hit by the blows ofinert gas coming from conduits 104, whose position is shown in the figures by way of example only. which may be obtained through the use of porous materials suitably provided on said ingot mould.
Said conduits are arranged in the ingot mould wall so i as to cause a motion in the molten steel in the upper part of said ingot mould; said motions in the molten steel have the purpose of carrying, together with the stream of neutral gas. the possible inclusions towards the bath surface. preventing them from being imprisoned within the steel layer which is getting hard on the lower parts of the inner wall of said ingot mould.
Through the injection of an inert gas, a controlled turbulence and an agitation are obtained in the upper part of said ingot mould, therefore. a substantially continuous wave 105 is formed along the perimeter of said ingot mould.
Such a motion prevents the non-metallic material from concentrating at the interface between the hardening steel and the still liquid steel. Further. said motion owing to the continuous washing of the surface of the steel getting hard, decreases the tendency of the inclusions to be imprisoned therein. Such a motion is similar to the one obtained during the treatment of the wild steel cast in the traditional ingot moulds.
The conduits 104, passing through the ingot mould wall, are preferably inclined upwards so as to facilitate streams of liquid metal tending to form a peripheral continuous wave 105.
The cross section of said nozzles may be constant or variable within the thickness of the ingot mould wall, according to principles known per se, for obtaining in each case. the best efficiency of the gaseous blow entering the fluid metal. Said gas may be also made to pass through porous materials suitably provided on the copper ingot mould.
Conduits 104 may be provided also only in the long walls of said ingot mould. In the same way. said conduits 104 may be in the form of a horizontal, vertical or inclined slot.
FIG. 5 shows a mold similar to FIG. 4, however. the conduits 104 for the inert gas have been replaced by mold walls which are sufficiently porous to permit the inert gas to travel through the walls. FIG. 6 shows a porous wall portion of a mold on an enlarged scale.
It is to be understood that the invention is not limited to the examples shown. It is intended to cover all modifications and equivalents within the scope of the appended claims.
What we claim is:
1. In a method for the continuous casting of killed steel into a mold by means of a tubular member reaching downwardly into the mold. wherein an inert gas is blown into the mold simultaneously with the molten steel, the improvement comprising blowing said inert gas into the top portion of the ingot being east through the mold side walls just under the top surface of the ingot being cast and above the layer of steel hardening on the inner surface of the mold walls so that a continuous wave is formed and sustained in said top surface of the ingot being cast, said continuous wave washing impurities in the molten steel to the surface of the ingot being cast to thus prevent the concentration of impurities at the interface between the hardening steel and the still liquid steel.
2. In an apparatus for the continuous casting of killed steel into a mold having elongated side walls and short side walls, and a melt discharging nozzle closed at its lower end and reaching downwardly into the mold substantially intermediate said short mold side walls, said melt discharging nozzle having two substantially horizontally directed melt discharging openings adjacent to said lower end of said nozzle, each of said melt discharging openings facing its respective short side wall. the improvement comprising means in said side walls of the mold for injecting an inert gas into the molten metal just under the top surface of the ingot being cast, and above the layer of steel hardening on the inner surface of the mold walls for creating a continuous wave in the surface of an ingot being cast, whereby impurities are continuously washed to the surface and thus prevented from concentrating at the interface between the hardening steel and the still liquid steel.
3. The apparatus according to claim 2, wherein said means for injecting an inert gas comprise conduits extending through said side walls. said conduits being upwardly inclined.
4. The apparatus according to claim 2, wherein said means for injecting an inert gas comprise porous ingot side wall portions at the upper end thereof.

Claims (4)

1. In a method for the continuous casting of killed steel into a mold by means of a tubular member reaching downwardly into the mold, wherein an inert gas is blown into the mold simultaneously with the molten steel, the improvement comprising blowing said inert gas into the top portion of the ingot being cast through the mold side walls just under the top surface of the ingot being cast and above the layer of steel hardening on the inner surface of the mold walls so that a continuous wave is formed and sustained in said top surface of the ingot being cast, said continuous wave washing impurities in the molten steel to the surface of the ingot being cast to thus prevent the concentration of impurities at the interface between the hardening steel and the still liquid steel.
2. In an apparatus for the continuous casting of killed steel into a mold having elongated side walls and short side walls, and a melt discharging nozzle closed at its lower end and reaching downwardly into the mold substantially intermediate said short mold side walls, said melt discharging nozzle having two substantially horizontally directed melt discharging openings adjacent to said lower end of said nozzle, each of said melt discharging openings facing its respective short side wall, the improvement comprising means in said side walls of the mold for injecting an inert gas into the molten metal just under the top surface of the ingot being cast, and above the layer of steel hardening on the inner surface of the mold walls for creating a continuous wave in the surface of an ingot being cast, whereby impurities are continuously washed to the surface and thus prevented from concentrating at the interface between the hardening steel and the still liquid steel.
3. The apparatus according to claim 2, wherein said means for injecting an inert gas comprise conduits extending through said side walls, said conduits being upwardly inclined.
4. The apparatus according to claim 2, wherein said means for injecting an inert gas comprise porous ingot side wall portions at the upper end thereof.
US366428A 1972-06-06 1973-06-04 Method and device for the continuous casting of killed steel with artificial wildness Expired - Lifetime US3908735A (en)

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IT1270672A IT960590B (en) 1972-06-06 1972-06-06 PROCEDURE AND DEVICE FOR CONTINUOUS CASTING OF CALMED STEEL WITH ARTIFICIAL EFFERVESCENCE
IT1285772 1972-08-22

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JP (1) JPS4951127A (en)
CA (1) CA994078A (en)
DE (1) DE2325690A1 (en)
ES (2) ES415557A1 (en)
FR (1) FR2187462A1 (en)
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NL (1) NL7307765A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3991815A (en) * 1974-06-25 1976-11-16 Vereinigte Osterreichische Eisen- Und Stahlwerke-Alpine Montan Aktiengesellschaft Casting tube with a bottom opening for continuously casting steel strands
US4005743A (en) * 1974-11-01 1977-02-01 Kawasaki Steel Corporation Apparatus for the continuous casting of metals especially steel, and method of continuously casting metals
US4236570A (en) * 1979-01-08 1980-12-02 Olin Corporation Ingot shape control by dynamic head in electromagnetic casting
US4480373A (en) * 1980-12-15 1984-11-06 Geskin Ernest S Steel making method
US4546811A (en) * 1981-07-17 1985-10-15 Commissariat A L'energie Atomique Process for the treatment of a liquid mass
US4588112A (en) * 1984-02-06 1986-05-13 Akechi Ceramics Kabushiki Kaisha Nozzle for continuous casting
US4716955A (en) * 1986-06-11 1988-01-05 Sms Concast Inc. Continuous casting method
US20020092326A1 (en) * 2000-12-16 2002-07-18 Schott Glas Device for manufacturing glass gobs

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19758142A1 (en) * 1997-12-19 1999-07-01 Mannesmann Ag Device for supplying molten metal

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3208117A (en) * 1962-03-28 1965-09-28 Reisholz Stahl & Roehrenwerk Casting method
US3517726A (en) * 1969-08-04 1970-06-30 Inland Steel Co Method of introducing molten metal into a continuous casting mold
US3776294A (en) * 1971-03-18 1973-12-04 B Paton Method of electroslag remelting

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3208117A (en) * 1962-03-28 1965-09-28 Reisholz Stahl & Roehrenwerk Casting method
US3517726A (en) * 1969-08-04 1970-06-30 Inland Steel Co Method of introducing molten metal into a continuous casting mold
US3776294A (en) * 1971-03-18 1973-12-04 B Paton Method of electroslag remelting

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3991815A (en) * 1974-06-25 1976-11-16 Vereinigte Osterreichische Eisen- Und Stahlwerke-Alpine Montan Aktiengesellschaft Casting tube with a bottom opening for continuously casting steel strands
US4005743A (en) * 1974-11-01 1977-02-01 Kawasaki Steel Corporation Apparatus for the continuous casting of metals especially steel, and method of continuously casting metals
US4236570A (en) * 1979-01-08 1980-12-02 Olin Corporation Ingot shape control by dynamic head in electromagnetic casting
US4480373A (en) * 1980-12-15 1984-11-06 Geskin Ernest S Steel making method
US4546811A (en) * 1981-07-17 1985-10-15 Commissariat A L'energie Atomique Process for the treatment of a liquid mass
US4620587A (en) * 1981-07-17 1986-11-04 Commissariat A L'energie Atomique Process for the treatment of a liquid mass
US4588112A (en) * 1984-02-06 1986-05-13 Akechi Ceramics Kabushiki Kaisha Nozzle for continuous casting
US4716955A (en) * 1986-06-11 1988-01-05 Sms Concast Inc. Continuous casting method
US20020092326A1 (en) * 2000-12-16 2002-07-18 Schott Glas Device for manufacturing glass gobs
US6907755B2 (en) * 2000-12-16 2005-06-21 Schott Glas Device for manufacturing glass gobs

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ES425058A1 (en) 1976-06-16
CA994078A (en) 1976-08-03
DE2325690A1 (en) 1973-12-20
JPS4951127A (en) 1974-05-17
GB1438186A (en) 1976-06-03
NL7307765A (en) 1973-12-10
ES415557A1 (en) 1976-02-16

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