US3572422A - Apparatus for shrouding a pouring stream and molten casting surface with a protective gas - Google Patents

Apparatus for shrouding a pouring stream and molten casting surface with a protective gas Download PDF

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Publication number
US3572422A
US3572422A US782578A US3572422DA US3572422A US 3572422 A US3572422 A US 3572422A US 782578 A US782578 A US 782578A US 3572422D A US3572422D A US 3572422DA US 3572422 A US3572422 A US 3572422A
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US
United States
Prior art keywords
stream
shrouding
gas
mold
protective gas
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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
US782578A
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English (en)
Inventor
Richard E Lyman
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United States Steel Corp
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United States Steel Corp
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Filing date
Publication date
Application filed by United States Steel Corp filed Critical United States Steel Corp
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Publication of US3572422A publication Critical patent/US3572422A/en
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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
    • B22D11/106—Shielding the molten jet

Definitions

  • This invention relates to an improved method and apparatus for shrouding a molten metal pouring stream and the casting meniscus with the protective gas.
  • An object of my invention is to provide an improved shrouding method and apparatus which leaves the nozzle outlet accessible, yet assures that the protective gas properly envelops both the pouring stream and casting meniscus, thereby effectively preventing oxidation of the metal.
  • a more specific object is to provide an improved shrouding method and apparatus in which the pouring stream passes through an enlarged chamber with a restricted opening, and a protective gas is injected to this chamber, where it is maintained under positive pressure and escapes through said opening to envelop the pouring stream, as well as covering the casting meniscus.
  • FIG. 1 is a vertical sectional view of my improved shrouding apparatus positioned between a nozzle and mold;
  • FIG. 2 is a horizontal section on line II-II of FIG. 1.
  • FIG. 1 shows portions of a bottom-pour vessel 10, commonly a ladle or tundish, and a mold 12, which may be part of a continuous-casting machine or an ingot mold.
  • Vessel has a nozzle 13 through which a pouring stream of molten metal S discharges into mold 13, where it forms a pool P having a meniscus at its upper surface.
  • the metal has been degassed in a vacuum apparatus, as known in the art.
  • the vessel may be equipped with any suitable closure means (not shown) for controlling dis- 3,572,422 Patented Mar. 23, 1971 charge or metal through nozzle 13.
  • the foregoing parts and their operation are conventional, and hence are not shown or described in more detail.
  • My improved shrouding apparatus includes a supporting plate 14 and an open-bottom box 15 resting on said plate.
  • the plate may be fixed permanently to the top of mold 12.
  • box 15 is square in plan and is formed of sections 15a and 15b separable along the transverse center line 16 of the box (FIG. 2). The sectional construction enables me to remove the box while metal is being poured without interrupting the operation.
  • the top of box 15 is spaced below the outlet of nozzle 13 by a distance x, which equals about /2 to 4 times the stream diameter d.
  • the top has a restricted opening 17 through which stream S enters the box and mold.
  • the cross-sectional area of the box is large in relation to that of the stream, and the diameter y of its opening 17 is about 2 to 4 times the stream diameter d.
  • the area of opening 17 should be less than 25 percent of the cross-sectional area of a mold having a cross-section greater than about square inches, and less than 50 percent if the mold has a smaller cross section.
  • the top has a viewing port 18 and a transparent window 19 covering the port.
  • Plate 14 contains a gas inlet tube 20 and a sampling tube 21.
  • the inlet tube has a downturned segment 22 at its discharge end directed toward the surface of pool P in mold 12.
  • the gas discharges downwardly into mold 12 through the downturned segment 22 at a location remote from the opening 17.
  • the gas covers the meniscus at the top of pool P.
  • the gas is under sufficient pressure, as hereinafter demonstrated, that it builds up a positive pressure with the enclosure and prevents air from entering.
  • the gas escapes from the box through the opening 17, flowing upwardly around stream S as indicated by arrows 23.
  • the gas also forms a concentric eddy current zone 24 adjacent stream S induced by a moving boundary layer at the stream surface.
  • the injected gas fiows through the mold and box and continuously purges the space within. Thus it provides atmosphere control beyond mere exclusion of air.
  • the residence time of the injected gas is long enough that absorption of gases dissolved in the molten metal (by virtue of low partial pressure) is effective. If the injected gas is reactive (e.g. reducing), the residence time provides reactive efficiency.
  • said enclosure having a cross-sectional area which is large in relation to said stream the top of said enclosure having a restricted opening through which said stream enters an inlet tube extending through said plate and having 4 a downturned segment directed into said mold for injecting a protective gas into said-enclosure at a location remote from said opening and maintaining the gas under a positive pressure said opening forming an escape route for the gas to enable it to envelop the stream;

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
US782578A 1968-12-10 1968-12-10 Apparatus for shrouding a pouring stream and molten casting surface with a protective gas Expired - Lifetime US3572422A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US78257868A 1968-12-10 1968-12-10

Publications (1)

Publication Number Publication Date
US3572422A true US3572422A (en) 1971-03-23

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ID=25126488

Family Applications (1)

Application Number Title Priority Date Filing Date
US782578A Expired - Lifetime US3572422A (en) 1968-12-10 1968-12-10 Apparatus for shrouding a pouring stream and molten casting surface with a protective gas

Country Status (10)

Country Link
US (1) US3572422A (enrdf_load_stackoverflow)
AT (1) AT310369B (enrdf_load_stackoverflow)
BE (1) BE742545A (enrdf_load_stackoverflow)
BR (1) BR6914884D0 (enrdf_load_stackoverflow)
CA (1) CA938424A (enrdf_load_stackoverflow)
DE (1) DE1960771A1 (enrdf_load_stackoverflow)
ES (1) ES374072A1 (enrdf_load_stackoverflow)
FR (1) FR2025743A1 (enrdf_load_stackoverflow)
GB (1) GB1298346A (enrdf_load_stackoverflow)
NL (1) NL6918410A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3932169A (en) * 1973-06-28 1976-01-13 United States Steel Corporation Method of making briquettes with machine having an inert gas seal
US4062397A (en) * 1976-03-16 1977-12-13 Cashdollar Sr Robert E Protection against oxidation of molten metal streams in continuous casting
US4078600A (en) * 1976-02-03 1978-03-14 Cashdollar Sr Robert E Continuous casting
US4218048A (en) * 1978-11-17 1980-08-19 Georgetown Texas Steel Corp. Suspended gas shroud apparatus
US5067552A (en) * 1989-07-26 1991-11-26 Ltv Steel Company, Inc. Shrouding for top pouring of ingots
DE4426596A1 (de) * 1993-08-02 1995-02-09 Air Prod & Chem Im Wirbel verteilende Düse für verflüssigte inerte Tieftemperaturgase zur Abdeckung von Metallschmelzen, die Umgebungsluft ausgesetzt sind

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2137090B1 (enrdf_load_stackoverflow) * 1971-05-13 1973-12-28 Air Liquide
DE2655912C2 (de) * 1976-12-09 1983-11-03 Linde Ag, 6200 Wiesbaden Vorrichtung zum Abschirmen des Gießstrahls einer Gießanlage
CH628547A5 (de) * 1978-06-30 1982-03-15 Fischer Ag Georg Formgussverfahren und vorrichtung zum vergiessen von metallischen formgussstuecken in einer form.
FR2541915A2 (fr) * 1982-02-15 1984-09-07 Poncet Pierre Dispositif d'amenee du metal dans les lingotieres de coulee continue

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3932169A (en) * 1973-06-28 1976-01-13 United States Steel Corporation Method of making briquettes with machine having an inert gas seal
US4078600A (en) * 1976-02-03 1978-03-14 Cashdollar Sr Robert E Continuous casting
US4062397A (en) * 1976-03-16 1977-12-13 Cashdollar Sr Robert E Protection against oxidation of molten metal streams in continuous casting
US4218048A (en) * 1978-11-17 1980-08-19 Georgetown Texas Steel Corp. Suspended gas shroud apparatus
US5067552A (en) * 1989-07-26 1991-11-26 Ltv Steel Company, Inc. Shrouding for top pouring of ingots
DE4426596A1 (de) * 1993-08-02 1995-02-09 Air Prod & Chem Im Wirbel verteilende Düse für verflüssigte inerte Tieftemperaturgase zur Abdeckung von Metallschmelzen, die Umgebungsluft ausgesetzt sind

Also Published As

Publication number Publication date
DE1960771A1 (de) 1970-08-13
GB1298346A (en) 1972-11-29
BE742545A (enrdf_load_stackoverflow) 1970-06-02
ES374072A1 (es) 1971-12-01
AT310369B (de) 1973-09-25
BR6914884D0 (pt) 1973-03-01
NL6918410A (enrdf_load_stackoverflow) 1970-06-12
CA938424A (en) 1973-12-18
FR2025743A1 (enrdf_load_stackoverflow) 1970-09-11

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