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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Publication number
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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United States
Prior art keywords
steel
mold
ingot
cast
inert gas
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Expired - Lifetime
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US366428A
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English (en)
Inventor
Candia Armando Di
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Italsider SpA
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Italsider SpA
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Priority claimed from IT1270672A external-priority patent/IT960590B/it
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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

Definitions

  • 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)
US366428A 1972-06-06 1973-06-04 Method and device for the continuous casting of killed steel with artificial wildness Expired - Lifetime US3908735A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1270672A IT960590B (it) 1972-06-06 1972-06-06 Procedimento e dispositivo per la colata continua di acciaio calmato con effervescenza artificiale
IT1285772 1972-08-22

Publications (1)

Publication Number Publication Date
US3908735A true US3908735A (en) 1975-09-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
US366428A Expired - Lifetime US3908735A (en) 1972-06-06 1973-06-04 Method and device for the continuous casting of killed steel with artificial wildness

Country Status (8)

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US (1) US3908735A (enExample)
JP (1) JPS4951127A (enExample)
CA (1) CA994078A (enExample)
DE (1) DE2325690A1 (enExample)
ES (2) ES415557A1 (enExample)
FR (1) FR2187462A1 (enExample)
GB (1) GB1438186A (enExample)
NL (1) NL7307765A (enExample)

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 (de) * 1997-12-19 1999-07-01 Mannesmann Ag Einrichtung zur Zuführung von Metallschmelze

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

Also Published As

Publication number Publication date
FR2187462A1 (enExample) 1974-01-18
ES415557A1 (es) 1976-02-16
JPS4951127A (enExample) 1974-05-17
CA994078A (fr) 1976-08-03
ES425058A1 (es) 1976-06-16
DE2325690A1 (de) 1973-12-20
GB1438186A (en) 1976-06-03
NL7307765A (enExample) 1973-12-10

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