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US3833047A - Process and apparatus for supplementary cooling of the center of a continuously cast metal bar - Google Patents

Process and apparatus for supplementary cooling of the center of a continuously cast metal bar Download PDF

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Publication number
US3833047A
US3833047A US00304893A US30489372A US3833047A US 3833047 A US3833047 A US 3833047A US 00304893 A US00304893 A US 00304893A US 30489372 A US30489372 A US 30489372A US 3833047 A US3833047 A US 3833047A
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US
United States
Prior art keywords
metal
pipe
mold
melted metal
melted
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Expired - Lifetime
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US00304893A
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English (en)
Inventor
R Tovini
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Dalmine SpA
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Dalmine SpA
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Publication date
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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
    • B22D11/112—Treating the molten metal by accelerated cooling

Definitions

  • the present invention concerns an improved process and device for the continuous casting of bars, of the type in which a metal, such as steel, is transformed from the melted state to the solid bar state through passage through a chilled mould. More especially the in vention applies to the processes for continuous casting in which the liquid metal is caused to flow into a mould of rectilinear axis which is substantially vertical;
  • metal bars produced by all continuous casting processes of known technique contain a porous zone in the center, which is normally no problem when the bar is used for rolled sections or structural shapes, due to the fact that the small internal holes fuse together as a result of the rolling pressure, but which instead can cause considerable inconveniences when the bar, especially in the round section, is intended for the manufacture of pipes.
  • the first operation performed on the bar is that of piercing the center in a piercing rolling-mill using skew rolls which cause stresses in the center of the piece. These are not pressure stresses alone and therefore can open up the little internal holes causing subsequently defects such as scales on the internal surface of the manufactured pipe.
  • the above object is achieved through an improved casting device wherein the inert gas is insufflated into the melted mass through a piping which ends into a pipe made of metal whose composition is identical to that of the billet in course of solidification.
  • This metallic pipe which wears out because it melts into the liquid mass in course of solidification, is introduced continuously from the top along the axis of the mould.
  • the dimensions of this metal pipe as well as the speed with which it is fed are calculated in such a manner that the quantity of metal fed is completely melted before solidifying again.
  • For melting the metal pipe is made use of the enthalpy of overheating of the surrounding metal mass which is in such manner further cooled. This supplementary cooling due to the melting of the metal pipe is, as well known to the skilled in the art, more intense than the caused by the insufflated gas stream.
  • the use of the metal pipe according to the present invention offers another advantage because the metal pipe does not require a porous plug or diaphragm at its end. It is known in fact that such porous plugs or diaphragms are subject to occlusions due to momentary decreases of the pressure of the insufflated gas with subsequent penetration and solidification of the liquid metal into the pores of the plug or diaphragm.
  • FIG. 1 is a schematic sectional view of an apparatus for continuous castingaccording to the process of the present invention.
  • FIG. 2 shows in correspondence of two different transverse sections of the bar in the act of solidifying, and the temperature trends in the continuous casting process of the present invention.
  • the liquid metal, particularly steel. contained in the crucible 1 is discharged into hopper 2 from which pours out a jet 3 which falls into mould 4 forming a liquid bath or well 5.
  • Rolls 6 guide the bar partially solidified 7 through a curtain of water sprays produced by a series of nozzles 8 mounted on a manifold 9.
  • the liquid well 5, of substantially invertedcone form whose base is the top free surface of the melted metal, has its lower vertex 10 at the point where the solidification is completed.
  • Rolls 11 draw from the mould 4 the bar 7 which is subjected to secondary coolmg.
  • FIG. 1 which shows a primary realizable method of the process covered by the present invention
  • hopper 2 is displaced in such a manner that jet 3 falls into the mould in off-center position, but could also provide for two or more jets symmetrical in respect to the axis of 5 the mould.
  • the solid metal pipe 13, having the same composition as that of the melted metal and therefore of bar 7, is fed continuously through feed-rolls 12 into the center of liquid well 5.
  • bar 13 also melts assorbing heat from the surrounding melted metal in the liquid well which for that reason becomes cooled.
  • any gaseous substance at room temperature which neither reacts with the liquid metal nor modifies the metal properties of the melted mass, can be used as an inert gas according to the present invention.
  • nitrogen or argon can be used to this purpose.
  • the quantity of inert gas to be insufflated into the inner part of the melted mass is approprietaly chosen according to the volume of the melted mass contained in the mould, according to the extraction speed of the solidifled bar as well as according to other factors known to those skilled in the art.
  • a stream of nitrogen between 0.3 and 1.6 liter/minute has given satisfactory results in many cases.
  • the lower end of the pipe 13 is dipped into the inner part of the melted mass down to the desired depth. which is usually in the range between about and about 80 centimeters.
  • the metal pipe 13 is used in rolls of a considerable length. During the casting process the pipe 13 is first unrolled and then straightened by means of a known device which also provides for the continuous feeding of the pipe as its dipped end melts in the liquid well.
  • the opposite end of metal pipe 13 is connected to the gas feeding piping through a known gastight rotative joint.
  • the source of the fed inert gas can be a pressure tank or a plurality of metal bottles.
  • FIG. 2 where below and in line with a schematic view in longitudinal section of a bar in the act solidifying according to the process of the present invention are the diagrams of the temperatures respectively in transverse sections AA and BB, with T there has been indicated the temperature corresponding to the change from liquid state to solid state.
  • a process for the continuous casting of metal in a vertical mold comprising the steps of feeding melted metal into the top of the mold,
  • a continuous casting apparatus comprising a mold having an open upper end and an open lower end for receiving and solidifying melted metal therein,

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
US00304893A 1971-11-13 1972-11-09 Process and apparatus for supplementary cooling of the center of a continuously cast metal bar Expired - Lifetime US3833047A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT31065/71A IT940586B (it) 1971-11-13 1971-11-13 Procedimento perfezionato di cola ta continua di barre metalliche in particolare di acciaio

Publications (1)

Publication Number Publication Date
US3833047A true US3833047A (en) 1974-09-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00304893A Expired - Lifetime US3833047A (en) 1971-11-13 1972-11-09 Process and apparatus for supplementary cooling of the center of a continuously cast metal bar

Country Status (7)

Country Link
US (1) US3833047A (it)
JP (1) JPS5123372B2 (it)
DE (1) DE2162977A1 (it)
ES (1) ES408526A1 (it)
FR (1) FR2159515A1 (it)
GB (1) GB1389430A (it)
IT (1) IT940586B (it)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3888294A (en) * 1973-06-14 1975-06-10 Voest Ag Method of continuously casting steel
US4015655A (en) * 1974-06-25 1977-04-05 Vereinigte Osterreichische Eisen- Und Stahlwerke-Alpine Montan Aktiengesellschaft Process and apparatus for continuously casting strands of unkilled or semi-killed steel
WO2001062417A1 (en) * 2000-02-23 2001-08-30 General Electric Company Casting systems and processes with an off-center incoming source of liquid metal
US6427752B1 (en) * 1999-02-23 2002-08-06 General Electric Company Casting systems and methods with auxiliary cooling onto a liquidus portion of a casting
US6631753B1 (en) * 1999-02-23 2003-10-14 General Electric Company Clean melt nucleated casting systems and methods with cooling of the casting
CN104148598A (zh) * 2014-09-01 2014-11-19 北京科技大学 一种包覆材料固/液复合双重凝固连铸成形设备与方法
CN104174823A (zh) * 2014-09-01 2014-12-03 北京科技大学 一种包覆材料固/液复合连铸成形设备与方法
CN107234221A (zh) * 2017-07-24 2017-10-10 东北大学 一种双冷场连续制备高品质铝合金扁锭的工艺
CN107321942A (zh) * 2017-07-24 2017-11-07 东北大学 一种铝合金立式铸轧工艺及装置
CN107876714A (zh) * 2017-10-25 2018-04-06 刘宗蒲 一种高效散热金属材料的制备方法
CN108994269A (zh) * 2017-06-07 2018-12-14 上海交通大学 铝合金半连续铸锭的晶粒细化方法及装置
CN110653259A (zh) * 2018-06-29 2020-01-07 宝山钢铁股份有限公司 一种金属复合板带连续生产装置和方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102166637B (zh) * 2010-11-26 2013-01-02 中国科学院金属研究所 一种消除连铸钢锭中心缩孔和疏松的方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2361101A (en) * 1943-11-02 1944-10-24 Kellogg M W Co Metal casting apparatus
DE1111781B (de) * 1956-07-28 1961-07-27 Huettenwerk Oberhausen Ag Verfahren und Vorrichtung zum fallenden Giessen von Metallen in Kokillen unter Schutzgas
FR1280985A (fr) * 1961-02-10 1962-01-08 Centre Nat Rech Metall Procédé et dispositif pour le contrôle de l'effervescence et le calmage de l'acieren coulée et acier conforme à celui ainsi obtenu
US3208117A (en) * 1962-03-28 1965-09-28 Reisholz Stahl & Roehrenwerk Casting method
FR1587288A (it) * 1968-10-29 1970-03-13
US3746070A (en) * 1971-06-25 1973-07-17 Nat Steel Corp Method for improving continuously cast strands

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2361101A (en) * 1943-11-02 1944-10-24 Kellogg M W Co Metal casting apparatus
DE1111781B (de) * 1956-07-28 1961-07-27 Huettenwerk Oberhausen Ag Verfahren und Vorrichtung zum fallenden Giessen von Metallen in Kokillen unter Schutzgas
FR1280985A (fr) * 1961-02-10 1962-01-08 Centre Nat Rech Metall Procédé et dispositif pour le contrôle de l'effervescence et le calmage de l'acieren coulée et acier conforme à celui ainsi obtenu
US3208117A (en) * 1962-03-28 1965-09-28 Reisholz Stahl & Roehrenwerk Casting method
FR1587288A (it) * 1968-10-29 1970-03-13
US3746070A (en) * 1971-06-25 1973-07-17 Nat Steel Corp Method for improving continuously cast strands

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3888294A (en) * 1973-06-14 1975-06-10 Voest Ag Method of continuously casting steel
US4015655A (en) * 1974-06-25 1977-04-05 Vereinigte Osterreichische Eisen- Und Stahlwerke-Alpine Montan Aktiengesellschaft Process and apparatus for continuously casting strands of unkilled or semi-killed steel
US6427752B1 (en) * 1999-02-23 2002-08-06 General Electric Company Casting systems and methods with auxiliary cooling onto a liquidus portion of a casting
US6631753B1 (en) * 1999-02-23 2003-10-14 General Electric Company Clean melt nucleated casting systems and methods with cooling of the casting
WO2001062417A1 (en) * 2000-02-23 2001-08-30 General Electric Company Casting systems and processes with an off-center incoming source of liquid metal
CN104174823B (zh) * 2014-09-01 2016-04-20 北京科技大学 一种包覆材料固/液复合连铸成形设备与方法
CN104174823A (zh) * 2014-09-01 2014-12-03 北京科技大学 一种包覆材料固/液复合连铸成形设备与方法
CN104148598B (zh) * 2014-09-01 2016-01-20 北京科技大学 一种包覆材料固/液复合双重凝固连铸成形设备与方法
CN104148598A (zh) * 2014-09-01 2014-11-19 北京科技大学 一种包覆材料固/液复合双重凝固连铸成形设备与方法
CN108994269A (zh) * 2017-06-07 2018-12-14 上海交通大学 铝合金半连续铸锭的晶粒细化方法及装置
CN108994269B (zh) * 2017-06-07 2021-06-15 上海交通大学 基于铝合金半连续铸锭的晶粒细化装置的晶粒细化方法
CN107234221A (zh) * 2017-07-24 2017-10-10 东北大学 一种双冷场连续制备高品质铝合金扁锭的工艺
CN107321942A (zh) * 2017-07-24 2017-11-07 东北大学 一种铝合金立式铸轧工艺及装置
CN107234221B (zh) * 2017-07-24 2019-06-04 东北大学 一种双冷场连续制备高品质铝合金扁锭的工艺
CN107876714A (zh) * 2017-10-25 2018-04-06 刘宗蒲 一种高效散热金属材料的制备方法
CN107876714B (zh) * 2017-10-25 2019-04-30 刘宗蒲 一种高效散热金属材料的制备方法
CN110653259A (zh) * 2018-06-29 2020-01-07 宝山钢铁股份有限公司 一种金属复合板带连续生产装置和方法
US11788167B2 (en) 2018-06-29 2023-10-17 Baoshan Iron & Steel Co., Ltd. Device and method for manufacturing metal clad strips continuously

Also Published As

Publication number Publication date
IT940586B (it) 1973-02-20
GB1389430A (en) 1975-04-03
JPS5123372B2 (it) 1976-07-16
ES408526A1 (es) 1976-02-01
JPS4857829A (it) 1973-08-14
FR2159515A1 (it) 1973-06-22
DE2162977A1 (de) 1973-05-30

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