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US3880221A - Method for continuous casting of metals - Google Patents

Method for continuous casting of metals Download PDF

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Publication number
US3880221A
US3880221A US241251A US24125172A US3880221A US 3880221 A US3880221 A US 3880221A US 241251 A US241251 A US 241251A US 24125172 A US24125172 A US 24125172A US 3880221 A US3880221 A US 3880221A
Authority
US
United States
Prior art keywords
gas
molten metal
melt
treated
chamber
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
US241251A
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English (en)
Inventor
Anguel Tonchev Balevski
Ivan Dimov Nikolov
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.)
INST MELALOGNANIE I TECHNOLOGI
INSTITUT PO MELALOGNANIE I TECHNOLOGIA NO METALITE
Original Assignee
INST MELALOGNANIE I TECHNOLOGI
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 INST MELALOGNANIE I TECHNOLOGI filed Critical INST MELALOGNANIE I TECHNOLOGI
Priority to US415752A priority Critical patent/US3901305A/en
Application granted granted Critical
Publication of US3880221A publication Critical patent/US3880221A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B22D1/002—Treatment with gases
    • B22D1/005—Injection assemblies therefor
    • 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
    • B22D11/116—Refining the metal
    • B22D11/117—Refining the metal by treating with gases
    • 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
    • C21C7/0081—Treating and handling under pressure

Definitions

  • ABSTRACT A system for the continuous casting of a molten metal containing gas in solution wherein the molten metal is treated with gas under pressure in a first chamber con taining the soluble gas together with an inert gas which may or may not dissolve in the melt. and is delivered to a second chamber and thereafter to a final chamber provided with the continuous-casting mold. the latter two chambers being maintained under superatmospheric pressure by the soluble gas.
  • Our present invention relates to a method of and an apparatus for the continuous casting of metal bodies and, more particularly. to the continuous or semi eontinuous casting of elongated metal'bodies from-a melt containing a dissolved gas affecting the properties-of the metals.
  • Continuous-cast ingots may be rolled, forged, drawn or otherwise shaped to produce rod; tube, wire, strip and like elongated articles and such articles of a well-defined cross section may be'made without subsequent handling by the continuous-casting method.
  • continuous casting is not used to suggest that the casting operation is never interrupted or that molten metal is poured into the receiving end of the mold without cessation. The term is one of convenience used, as is known in the art.
  • Another object of the invention is the provision of a system for the continuous casting ofa molten metal containing dissolved gas in such manner as to avoid intercrystalline gas evolution. separation or porosity as has resulted in the past with metals containing gas as a result of the sharp decrease in solubilityduring the solidification process.
  • the apparatus for carrying out the method of the present invention thus may'comprise a first chamber wherein the'moltenmetal is treated with gas under pressure (i.e., the mixture of the soluble gas having metallurgical propertiesat a first partial pressure) and the inert gas, and a second chamber connected to the first and receiving the melt therefrom.
  • a thirdor. final chamber provided with or communicating with the continuouscasting mold is connected to the second or intermediate chamber and means is provided for maintaining the second and third chambers under a superatmospheric pressure of the soluble or dissolving gas so that the latter lias a higher partial pressure in these chambers than in the first chamber.
  • the first or treatment chamber comprises a housing above a ladle for the melt which may be pressurized and is connected by a syphon tube reaching into the melt to a second vessel also maintained under pressure via a housing above this ladle or pan.
  • the pressure differential between the chambers above the melts in these vessels serves to displace the molten metal from the first chamber to the second through the syphon tube in accordance with principles discussed in the prior applications and patents mentioned above.
  • the third chamber preferably located below the-second vessel is provided with a continuous casting mold which, advantageously, is elongated and is provided with cooling means along the mold wall to solidify the mold cast therein.
  • the chamber above the mold is advantageously connected with the chamber above the second vessel for control of a pressure differential therebetween to regulate the rate at which the molten metal is introduced into the mold.
  • lt has been found to be advantageous, moreover, to provide in the syphon tube a one-way valve system for mechanically blocking molten-metal communicating between the first and second vessels.
  • the apparatus comprising a ladle la received in a mass of insulating material lb of the treatment vessel 1, the ladle being heated by a coil 2 surrounding it within the insulating mass and preferably constituting an induction coil of conventional construction.
  • the vessel 1 is closed by a cover 6 defining a gas space 60 above the melt 3 therein and having a flap 6b openable to afford access to the ladle.
  • a perforated pipe 4 reaches downwardly into the melt and is connected via a throttle or pressurereducing valve 5' and a cut-off valve 8 with a source 7 of gas under pressure
  • the gas may thus be bubbled through the melt which may have a layer 3a of slag thereabove.
  • a futher valve and conduit 21 is provided which may open to the atmosphere.
  • a control device 7a may be provided to connect the gas-pressure source 7 with a gas pressure source 14 to be described subsequently so that the molten metal may be induced to flow through a syphon tube 11a through a conduit ll, 12 to the second vessel
  • Pressurized gas source 7 serves to supply the soluble gas (nitrogen) capable of affecting the metallurgy of the melt (steel) in mixture with an inert gas (argon) having no substantial metallurgical effect.
  • the respective partial pressures may be established by a conventional flow or pressure controller 7b connected to the respective gas bottles 7c and 7d.
  • a further valve 9 and its conduit supplies the gas mixture to the chamber 611 above the melt.
  • the syphon ll, 12 comprises a valve 1112 which is of the one-way type to prevent return of the melt to the ladle 1a.
  • the second vessel or chamber 10 comprises an insulating body 100 carrying a ladle or trough 10b communicating with the treatment ladle In via the syphon ll,
  • the space above the vessel b is represented at 10c and is closed by a cover 10d. This space is connected via a control valve 16 with the source 14 of soluble gas. A further valve 15 supplies this gas under pressure to valve 16 mentioned earlier and a valve 17 communicating with the third or mold chamber 13.
  • a discharge tube l0e leads from the bottom of the vessel 10b into the mold chamber 13 which is disposed above a continuous-casting mold 130 surrounded by a mass 13b of thermal insulation and a cooling coil 13c.
  • the mold 13a in the solidification region 18 is capable of forming an elongated body or billet 19 which is drawn downwardly at a controllable rate by the drawing device 20 Y which operates to controlledly resist the gravitational descent of the billet.
  • a seal 22 prevents escape of gas around the cast billet. Since the pressure differential defined by control unit 7a regulates the rate of flow between chambers 1 and 10, through the syphon ll, 12, the control 7a also synchronizes the actuating device 20 which may be of conventional construction. lt has been found to be advantageous to provide, in some cases, a bypass for the intermediate chambers 10 in the form of a conduit 12 which, with its valve 12", communicates directly between the first and third chambers. In this case a line 17 is used in place of valves 17 and 16 to deliver the gas with high partial pressure of soluble gas to the third chamber.
  • the soluble gas/inert gas mixture is bubbled through a melt in ladle la for a treatment period sufficient to effect the desired homogeneity of the melt and dissolution of gas therein. Usually this time suffices for steady state to be achieved.
  • the valve 9 is briefly opened to establish the desired pressure differential between chambers 10c and 6a to drive the molten metal through the syphon 11, 12 into the vessel 10b past the automatically open check valve 11b. This briefincrease in pressure does not appreciably alter the degree of dissolution of the gas since it acts upon the slag or flux layer 10g and to deliver the molten metal to this bath below the slag layer.
  • the pressure in space 60 can be returned to its usual value by venting through valve 21.
  • the pressure in chamber 10 is maintained at the level necessary to control the flow via conduit 10e into the mold and the gas is of a higher partial pressure of the soluble component than the gas used in vessel 1.
  • the absolute pressure in this part of the apparatus can also be considerably higher than that at which the melt is saturated with the soluble gas in the first vessel 1. In this manner we have been able to compensate the billet for the normal decrease in the solubility of the gas during solidifaction to maintain the concentration of the gas in the end product 19.
  • Various measuring, controlling and regulating devices may be provided for controlling the levels of metal in the various vessels, regulating temperatures and gas pressures and for establishing the metal and melt compositions.
  • the gas may be maintained dissolved in the melt through solidification to appear in solid solution in the cast billet without separation in the form of intercrystalline pores.
  • a method of making a metal body comprising the steps of:
  • step (b) continuously casting the melt treated in step (a) and solidifying the cast melt into an elongated body
  • step (b) maintaining the solubilized gas dissolved in the molten metal in solution during the continuous casting and solidification in step (b) by providing thereabove a gas atmosphere having a relatively high partial pressure of said soluble gas.
  • step (a) wherein said molten metal is treated in step (a) and is continuously cast and solidified in step (b) at two spatially separated locations. further comprising the step of temporarily storing the molten metal treated in step (a) under an atmosphere containing said soluble gas at a higher partial pressure than said relatively low partial pressure prior to continuously casting and solidifying the molten metal in step (b).
  • step (a) The method defined in claim 2 wherein the molten metal is treated in step (a) by bubbling gas therethrough below a slag layer.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Continuous Casting (AREA)
  • Fuses (AREA)
US241251A 1971-04-07 1972-04-05 Method for continuous casting of metals Expired - Lifetime US3880221A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US415752A US3901305A (en) 1971-04-07 1973-11-14 Apparatus for continuous casting of metals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BG1729571 1971-04-07

Publications (1)

Publication Number Publication Date
US3880221A true US3880221A (en) 1975-04-29

Family

ID=3897740

Family Applications (1)

Application Number Title Priority Date Filing Date
US241251A Expired - Lifetime US3880221A (en) 1971-04-07 1972-04-05 Method for continuous casting of metals

Country Status (14)

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US (1) US3880221A (da)
AT (1) AT329786B (da)
BE (1) BE781716A (da)
CA (1) CA986278A (da)
DD (1) DD95268A5 (da)
DE (1) DE2215816A1 (da)
DK (1) DK131275B (da)
FR (1) FR2132679B1 (da)
GB (1) GB1386154A (da)
IT (1) IT967041B (da)
NL (1) NL7204626A (da)
NO (1) NO134286C (da)
SE (1) SE375471B (da)
SU (1) SU522776A3 (da)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3998261A (en) * 1974-06-18 1976-12-21 British Steel Corporation Casting steel ingots
US4549598A (en) * 1981-12-17 1985-10-29 Noranda Inc. Process for minimizing foam formation during free falling of molten metal into moulds, launders or other containers
US6581673B1 (en) * 2000-12-29 2003-06-24 Hayes Lemmerz International, Inc. Method for controlling the filling of a mold cavity of a casting machine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE452860B (sv) * 1984-08-29 1987-12-21 Inst Po Metalloznanie I Tekno Sett att behandla och gjuta metaller i ett slutet utrymme och anordning for genomforande av settet

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3650313A (en) * 1968-10-09 1972-03-21 Inst Po Metalloznanie I Tekno Method for the production of castings from alloys of metals and gases
US3689048A (en) * 1971-03-05 1972-09-05 Air Liquide Treatment of molten metal by injection of gas
US3718175A (en) * 1969-04-15 1973-02-27 Voest Ag Plant for continuous casting without deep casting stream penetration

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3650313A (en) * 1968-10-09 1972-03-21 Inst Po Metalloznanie I Tekno Method for the production of castings from alloys of metals and gases
US3718175A (en) * 1969-04-15 1973-02-27 Voest Ag Plant for continuous casting without deep casting stream penetration
US3689048A (en) * 1971-03-05 1972-09-05 Air Liquide Treatment of molten metal by injection of gas

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3998261A (en) * 1974-06-18 1976-12-21 British Steel Corporation Casting steel ingots
US4549598A (en) * 1981-12-17 1985-10-29 Noranda Inc. Process for minimizing foam formation during free falling of molten metal into moulds, launders or other containers
US6581673B1 (en) * 2000-12-29 2003-06-24 Hayes Lemmerz International, Inc. Method for controlling the filling of a mold cavity of a casting machine

Also Published As

Publication number Publication date
FR2132679B1 (da) 1977-04-01
NL7204626A (da) 1972-10-10
ATA296572A (de) 1975-08-15
DK131275C (da) 1975-11-17
NO134286C (da) 1976-09-15
DD95268A5 (da) 1973-01-20
CA986278A (en) 1976-03-30
DK131275B (da) 1975-06-23
IT967041B (it) 1974-02-28
FR2132679A1 (da) 1972-11-24
SE375471B (da) 1975-04-21
BE781716A (fr) 1972-07-31
NO134286B (da) 1976-06-08
SU522776A3 (ru) 1976-07-25
GB1386154A (en) 1975-03-05
DE2215816A1 (de) 1972-11-16
AT329786B (de) 1976-05-25

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