US3747664A - Process for the treatment of cast bars in continuous casting plants - Google Patents

Process for the treatment of cast bars in continuous casting plants Download PDF

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Publication number
US3747664A
US3747664A US3747664DA US3747664A US 3747664 A US3747664 A US 3747664A US 3747664D A US3747664D A US 3747664DA US 3747664 A US3747664 A US 3747664A
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United States
Prior art keywords
bar
cast
cast bar
roll gap
continuous casting
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Expired - Lifetime
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English (en)
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R Schoffmann
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Voestalpine AG
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Voestalpine AG
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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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • B22D11/1282—Vertical casting and curving the cast stock to the horizontal

Definitions

  • ABSTRACT The invention relates to a process for the treatment of cast bars in continuous casting plants comprising a vertical mould, a curved and then horizontal supporting and guiding portion and a drawing and shaping stand with an adjustable roll gap, in which, in order to avoid any piping in the end part of the bar, the withdrawal speed is increased after casting is finished and the rear end of the bar is sealed so that the sump tip of the liquid bar core is shifted forward at least to the roll gap and a densening pressure is exerted upon the bar by narrowing said roll gap.
  • the output capacity of high capacity continuous casting plants is con siderably improved.
  • the invention relates to a process for the treatment of cast bars in continuous casting plants comprising a vertically arranged, water-cooled mould, a supporting and guiding portion joined to said mould and designed to be curved at first and then horizontal in which the cast bar having a liquid core is further cooled and in which the drawing speed of the bar during casting is chosen in a manner that the bar has solidified completely when leaving the horizontal supporting and guiding portion, and a drawing and shaping stand with an adjustable rolling gap arranged after the horizontal supporting and guiding portion.
  • the invention is aimed at increasing the yields of high capacity continuous casting plants with a horizontal guiding and supporting portion and, in a process of the kind described in the introduction, resides in that after termination of casting and covering of the bar end, in order to avoid any piping in the end part of the bar, by increasing the drawing out speed, the tip of the sump of the liquid bar core is shifted forward at least to the roll gap and in that a densening pressure is exerted upon the bar by narrowing the roll gap.
  • the process according to the invention is applied to steel bars having a rectangular cross section it is advantageous to create the densening pressure by cogging down the cast bar, the reduction of the bar thickness amounting from 10 to 30 mm, preferably from 15 to 20 mm.
  • the sump tip of the liquid bar core is shifted forward beyond the vertical plane laid through the roll gap by 0.5 to 2 mm before the densening pressure is applied, by increasing the drawing out speed of the bar.
  • FIG. 1 is a simplified, schematical vertical sectional view of an end part of a cast bar which after termination of casting is drawin out from a continuous casting plant; thereby the whole cast bar is cogged down.
  • FIG. 2 is a similar representation as FIG. 1 in which the end part of the bar in which the core is yet liquid is drawn out with increased speed as it runs through the horizontal supporting and guiding portion.
  • FIG. 3 is an analogous representation as FIG. 2 for a case in which only the end part of the bar is cogged down but not the whole bar.
  • FIG. 4 is a diagram of the current consumption of the drive motors for the drawing and shaping stand in dependence on the drawing out speed of the cast bar.
  • numeral 1 is a water-cooled continuous casting mould from which the cast bar 2 with an already solidified casting shell 3 and a liquid core 4 issues and is further cooled in a supporting and guiding portion of the continuous casting plant.
  • This supporting and guiding portion is provided with a plurality of rollers 5 arranged at both sides of the bar 2, and some pairs of driving rolls 6, 7 arranged in between.
  • a further pair of driving rolls 8 is built in behinda pair of rolls 9 of a combined drawing and shaping stand arranged behind the'supporting and guiding portiomNumeral 10 is the tip of the liquid core 4.
  • a plane 11 laid through the liquid phase tip 10 has a distance L from a plane 12 laid through the casting level, measured along the bar axis, L amounts to about 23 m with a mould cross section of mm- X 1,500'mm when deep drawing steel killed with aluminium is cast at a steel temperature of l,550 C measured in the tundish and a drawing out speed of 2 m/min.
  • a roller guide is provided below the continuous casting mould 1 which is at first vertical for about 2 m but in the plane 13 slowly becomes a circular roller guide with the radius R; with continuous casting plants for slabs in which the mould has the above mentioned dimensions R amounts to about 8 to 10 m.
  • Numeral 14 denotes a vertical plane laid through the pair of driving rolls 6 which plane measured along the bar axis is about m remote from the plane 12 laid through the casting level.
  • the horizontal supporting and guiding portion is about 10 m long and extends from the plane 14 to the last pair of rollers 5 in front of the pair of rolls 9.
  • Numeral 15 is a vertical plane laid through the pair of rolls 9 which is arranged at a distance of 1.5 m from the last pair of rollers 5.
  • the 180 mm thick solidified bar 2 is cogged down over its entire extension by a total of l5 mm to 165 mm by the pair of rolls 9 at a drawing speed which remains essentially uniform; the cogged down bar is denoted with 16.
  • a cover is formed at the bar end bysplashing water ontothe solidifying bar; during drawing the thickness of this cover is increased by further cooling in the arcshaped supporting and guiding portion; in FIG. 2 this thickened cover is deonted with numeral 21.
  • the drawing out speed is increased. This causes a theoretical shifting of the liquid phase tip.
  • the cast bar 2 is not shaped at first so that the thickness of the solidified bar 22 corresponds to the thickness of the case bar 2. Only after the drawing out speed is increased cogging down is started so that a somewhat thinner end of the cast bar 23 is obtained; it is likewise free from cavities.
  • a process of producing a cast bar in a continuous casting plant from a pre-determined amount of metal the bar being cast continuously through a vertically arranged water-cooled mould in a downwardly direction, the cast bar having a solidified outer section and a liquid core section, the cast bar being guided first through a curved supporting means and then through a substantially horizontal supporting means, the rate of travel of the cast bar being adjusted during casting so that the cast bar is completely solidified when leaving the horizontal supporting means, and the solidified cast bar being subjected to a drawing and shaping operation in a roll stand with an adjustable roll gap, the improvement comprising the steps of sealing the end of the cast bar in the mould when the pre-determined amount of metal is exhausted, increasing the rate of travel of the cast bar in the two supporting means to shift the forward most tip of the liquid core of the bar to a downstream position at least at the roll gap, and adjusting the roll gap to exert a densening pressure upon the cast bar.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
US3747664D 1970-09-04 1970-09-04 Process for the treatment of cast bars in continuous casting plants Expired - Lifetime US3747664A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT804570A AT298714B (de) 1970-09-04 1970-09-04 Verfahren zur Behandlung von Gußsträngen in Stranggießanlagen

Publications (1)

Publication Number Publication Date
US3747664A true US3747664A (en) 1973-07-24

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ID=3601979

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US3747664D Expired - Lifetime US3747664A (en) 1970-09-04 1970-09-04 Process for the treatment of cast bars in continuous casting plants

Country Status (12)

Country Link
US (1) US3747664A (enrdf_load_stackoverflow)
JP (1) JPS5125413B1 (enrdf_load_stackoverflow)
AT (1) AT298714B (enrdf_load_stackoverflow)
BE (1) BE771987A (enrdf_load_stackoverflow)
BR (1) BR7104952D0 (enrdf_load_stackoverflow)
CA (1) CA947941A (enrdf_load_stackoverflow)
CH (1) CH528941A (enrdf_load_stackoverflow)
DE (1) DE2124541A1 (enrdf_load_stackoverflow)
ES (1) ES392333A1 (enrdf_load_stackoverflow)
FR (1) FR2105241B1 (enrdf_load_stackoverflow)
GB (1) GB1365929A (enrdf_load_stackoverflow)
SE (1) SE362203B (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4493363A (en) * 1976-07-30 1985-01-15 Jernkontoret Method at continuous casting of steels and metal alloys with segregation tendency and apparatus for carrying out the method
US4924585A (en) * 1986-09-04 1990-05-15 Kawasaki Steel Corp. Method and apparatus for continuous compression forging of continuously cast steel
US5400850A (en) * 1991-09-19 1995-03-28 Sms Schloemann-Siemag Aktiengesellschaft Plant for production of steel strip
CN107685141A (zh) * 2017-09-11 2018-02-13 中冶赛迪工程技术股份有限公司 一种连铸机驱动辊控制方法
CN110303129A (zh) * 2019-06-26 2019-10-08 山东钢铁股份有限公司 一种宽厚板坯的制造方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IN155878B (enrdf_load_stackoverflow) * 1980-04-02 1985-03-23 Nippon Steel Corp
RU2145267C1 (ru) * 1999-04-26 2000-02-10 Открытое акционерное общество "Северсталь" Способ получения непрерывнолитых заготовок

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2856658A (en) * 1956-08-13 1958-10-21 Koppers Co Inc Method of continuous casting
US3346035A (en) * 1964-02-20 1967-10-10 Mannesmann Ag Preventing the overflow of liquid metal from an end casting head discharged in a curved continuous casting path towards the horizontal plane
US3491824A (en) * 1966-12-06 1970-01-27 Boehler & Co Ag Geb Process of producing rolled stock from a high-melting metal by continuous casting and rolling operations
US3491823A (en) * 1966-04-22 1970-01-27 Boehler & Co Ag Geb Process for the manufacture of continuous castings

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2856658A (en) * 1956-08-13 1958-10-21 Koppers Co Inc Method of continuous casting
US3346035A (en) * 1964-02-20 1967-10-10 Mannesmann Ag Preventing the overflow of liquid metal from an end casting head discharged in a curved continuous casting path towards the horizontal plane
US3491823A (en) * 1966-04-22 1970-01-27 Boehler & Co Ag Geb Process for the manufacture of continuous castings
US3491824A (en) * 1966-12-06 1970-01-27 Boehler & Co Ag Geb Process of producing rolled stock from a high-melting metal by continuous casting and rolling operations

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Continuous and Pressure Casting, published by Association of Iron and Steel Engineers, Pittsburgh, Pa., 1964. Page 14. *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4493363A (en) * 1976-07-30 1985-01-15 Jernkontoret Method at continuous casting of steels and metal alloys with segregation tendency and apparatus for carrying out the method
US4924585A (en) * 1986-09-04 1990-05-15 Kawasaki Steel Corp. Method and apparatus for continuous compression forging of continuously cast steel
US5400850A (en) * 1991-09-19 1995-03-28 Sms Schloemann-Siemag Aktiengesellschaft Plant for production of steel strip
CN107685141A (zh) * 2017-09-11 2018-02-13 中冶赛迪工程技术股份有限公司 一种连铸机驱动辊控制方法
CN107685141B (zh) * 2017-09-11 2019-04-16 中冶赛迪工程技术股份有限公司 一种连铸机驱动辊控制方法
CN110303129A (zh) * 2019-06-26 2019-10-08 山东钢铁股份有限公司 一种宽厚板坯的制造方法

Also Published As

Publication number Publication date
FR2105241A1 (enrdf_load_stackoverflow) 1972-04-28
CH528941A (de) 1972-10-15
BR7104952D0 (pt) 1973-05-15
FR2105241B1 (enrdf_load_stackoverflow) 1975-04-18
DE2124541A1 (de) 1972-03-09
AT298714B (de) 1972-05-25
GB1365929A (en) 1974-09-04
BE771987A (fr) 1971-12-31
JPS5125413B1 (enrdf_load_stackoverflow) 1976-07-30
SE362203B (enrdf_load_stackoverflow) 1973-12-03
CA947941A (en) 1974-05-28
ES392333A1 (es) 1973-08-16

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