US3891023A - Controlled flux addition for minimizing surface defects on continuously cast steel - Google Patents

Controlled flux addition for minimizing surface defects on continuously cast steel Download PDF

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Publication number
US3891023A
US3891023A US302465A US30246572A US3891023A US 3891023 A US3891023 A US 3891023A US 302465 A US302465 A US 302465A US 30246572 A US30246572 A US 30246572A US 3891023 A US3891023 A US 3891023A
Authority
US
United States
Prior art keywords
flux
steel
melting point
mold
max
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
US302465A
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English (en)
Inventor
Edward S Szekeres
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.)
United States Steel Corp
Original Assignee
United States Steel Corp
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 United States Steel Corp filed Critical United States Steel Corp
Priority to US302465A priority Critical patent/US3891023A/en
Priority to BE137077A priority patent/BE806527A/fr
Priority to ZA738282A priority patent/ZA738282B/xx
Priority to AU61829/73A priority patent/AU468866B2/en
Priority to BR8439/73A priority patent/BR7308439D0/pt
Priority to AT909773A priority patent/AT332015B/de
Priority to CA184,666A priority patent/CA997123A/en
Priority to AR250770A priority patent/AR198885A1/es
Priority to IT70211/73A priority patent/IT999709B/it
Priority to ES420075A priority patent/ES420075A1/es
Priority to NL7314904A priority patent/NL7314904A/xx
Priority to DE19732354560 priority patent/DE2354560A1/de
Priority to RO7376474A priority patent/RO67595A/fr
Priority to JP48121862A priority patent/JPS4994526A/ja
Priority to PL1973166231A priority patent/PL91148B1/pl
Priority to IN2403/CAL/73A priority patent/IN140171B/en
Priority to FR7338862A priority patent/FR2204472A1/fr
Priority to GB5064573A priority patent/GB1449234A/en
Application granted granted Critical
Publication of US3891023A publication Critical patent/US3891023A/en
Assigned to USX CORPORATION, A CORP. OF DE reassignment USX CORPORATION, A CORP. OF DE MERGER (SEE DOCUMENT FOR DETAILS). Assignors: UNITED STATES STEEL CORPORATION (MERGED INTO)
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
    • 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
    • B22D11/111—Treating the molten metal by using protecting powders

Definitions

  • the flux can (a) act as an insulating layer to prevent heat loss from the molten metal. (b) provide a barrier to the penetration of oxygen into the liquid steel in the mold. and provide a desired level of lubrication at the shell-mold interface.
  • low melting point fluxes i.e., those which melt very quickly and essentially flow down the sides of the shell of the strand, as fast as they are added to the mold. Examples of these fluxes are shown in US. Pat. No. 3,649,249.
  • Pinhole defects are small holes up to about 0.13 inch in diameter and up to about 0.15 inch deep that appear on the surface of the cast strand. When present on the surface or sufficiently close to the surface. the pinhole becomes oxidized and results in seams and slivers on the product rolled from the cast material.
  • FIGURE is a plot of pinhole frequency vs. flux usage coefficient.
  • the fluxes for which the instant invention is applicable are those which exhibit a comparatively low melting temperature.
  • Particularly desirable fluxes are those which have a final chemical composition within the following range, in wt. percent:
  • the above fluxes may be produced by blending together a source of calcium fluoride. alkali oxides (sodium or potassium). sodium borates and lime and melting the mixture to produce a lowsoftening point final product which is completely homogeneous and from which substantially all the gases have been removed. The molten material is then quenched, crushed and sized to produce the final product used in the casting procedure.
  • the above preferred fluxes are employed, or others well known to the art (e.g. US. Pat. No. 3,649,249) it is essentialthat they exhibit a melting point within the range of l400 to I900F and preferably within the range 'of I500" to 1750F. Since the product is essentially vitreous, there is no clearly defined melting point. However, for purposes of this invention the melting point may easily be determined by the following or other equivalent method:
  • Aone-inch high by three-quarteninch diameter, cylindrical pellet is pressed from the prefused, crushed and dried flux.
  • the pellet is placed on a refractory slab (about 2 X 2 X 1 inch) and inserted in a preheated furnace at l400F. After 15 minutes, the pellet is observed for the extent of melting. This test is then repeated (starting with a fresh pellet) every 25F until complete melting is observed in the respective 15-minute hold period. Complete melting is that condition for which none of the initial pellet profile is observed, i.e., the flux is sufficiently liquid to flow and substantially cover the slab surface. The temperature at which such complete melting" is observed may then be considered the melting point of the synthetic flux.
  • C.S.A. is the calculated surface area of a one-ton steel billet which may be covered by an essentially liquid flux.
  • F the preferred minimum flux usage
  • the following two examples illustrate how the prescribed coefficients may be employed to determine the amount of flux (in lbs per ton of steel cast) to be added.
  • 0.5 foot X 2 foot casting mold One ton of molten steel occupies a volume of approximately 4.6 cu. ft. Therefore, the length of a one-ton steel slab within the prescribed mold will be 0.5 X 2 X L 4.6, or L 4.6 ft.
  • the covered surface area (C.S.A.) of such a slab will then comprise the top surface (0.5 X 2) and the four sides 2 (0.5 X 4.6) and 2 (2 X 4.6), or 24.0 ft.
  • the maximum flux usage, in lbs. per ton of steel, for this mold would be:
  • F mum i.e., about 0.51 lbs/ton and maximum of this invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
US302465A 1972-10-31 1972-10-31 Controlled flux addition for minimizing surface defects on continuously cast steel Expired - Lifetime US3891023A (en)

Priority Applications (18)

Application Number Priority Date Filing Date Title
US302465A US3891023A (en) 1972-10-31 1972-10-31 Controlled flux addition for minimizing surface defects on continuously cast steel
BE137077A BE806527A (fr) 1972-10-31 1973-10-25 Addition de flux regle pour produire au minimum les defauts de surface d'un acier coule en continu
ZA738282A ZA738282B (en) 1972-10-31 1973-10-25 Controlled flux addition for minimizing surface defects on continuously cast steel
AU61829/73A AU468866B2 (en) 1972-10-31 1973-10-25 Controlled flux addition for minimizing surface defects on continuously cast steel
AT909773A AT332015B (de) 1972-10-31 1973-10-29 Verfahren zum stranggiessen von stahl
BR8439/73A BR7308439D0 (pt) 1972-10-31 1973-10-29 Aperfeicoamento em processo de fundicao continua de aco
NL7314904A NL7314904A (fr) 1972-10-31 1973-10-30
AR250770A AR198885A1 (es) 1972-10-31 1973-10-30 Metodo para el vaciado continuo de acero
IT70211/73A IT999709B (it) 1972-10-31 1973-10-30 Procedimento di colata continua di acciaio col minimo di difetti superficiali
ES420075A ES420075A1 (es) 1972-10-31 1973-10-30 Un metodo mejorado de colar continuamente acero.
CA184,666A CA997123A (en) 1972-10-31 1973-10-30 Controlled flux addition for minimizing surface defects on continuously cast steel
RO7376474A RO67595A (fr) 1972-10-31 1973-10-31 Procede de moulage continu d'acier
JP48121862A JPS4994526A (fr) 1972-10-31 1973-10-31
PL1973166231A PL91148B1 (fr) 1972-10-31 1973-10-31
IN2403/CAL/73A IN140171B (fr) 1972-10-31 1973-10-31
FR7338862A FR2204472A1 (fr) 1972-10-31 1973-10-31
GB5064573A GB1449234A (en) 1972-10-31 1973-10-31 Controlled flux addition fo minimizing surface defects on continuously cast steel
DE19732354560 DE2354560A1 (de) 1972-10-31 1973-10-31 Stranggussverfahren fuer stahl

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US302465A US3891023A (en) 1972-10-31 1972-10-31 Controlled flux addition for minimizing surface defects on continuously cast steel

Publications (1)

Publication Number Publication Date
US3891023A true US3891023A (en) 1975-06-24

Family

ID=23167834

Family Applications (1)

Application Number Title Priority Date Filing Date
US302465A Expired - Lifetime US3891023A (en) 1972-10-31 1972-10-31 Controlled flux addition for minimizing surface defects on continuously cast steel

Country Status (18)

Country Link
US (1) US3891023A (fr)
JP (1) JPS4994526A (fr)
AR (1) AR198885A1 (fr)
AT (1) AT332015B (fr)
AU (1) AU468866B2 (fr)
BE (1) BE806527A (fr)
BR (1) BR7308439D0 (fr)
CA (1) CA997123A (fr)
DE (1) DE2354560A1 (fr)
ES (1) ES420075A1 (fr)
FR (1) FR2204472A1 (fr)
GB (1) GB1449234A (fr)
IN (1) IN140171B (fr)
IT (1) IT999709B (fr)
NL (1) NL7314904A (fr)
PL (1) PL91148B1 (fr)
RO (1) RO67595A (fr)
ZA (1) ZA738282B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4311186A (en) * 1980-09-18 1982-01-19 Antonio Spaccarotella Method for quickly repairing break-outs in continuous casting plants

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5328511A (en) * 1976-08-31 1978-03-16 Japan Steel Works Ltd Slug for dephosphorizing and desulphurizing
CA1145146A (fr) * 1979-02-07 1983-04-26 Charles M. Loane, Jr. Agent granule de scorification pour la coulee continue de l'acier
US4290809A (en) * 1980-08-06 1981-09-22 Mobay Chemical Corporation Raw mix flux for continuous casting of steel
GB9005431D0 (en) * 1990-03-10 1990-05-09 Foseco Int Metallurgical flux compositions
CN113059136B (zh) * 2021-03-12 2022-05-20 鞍钢股份有限公司 一种消除方坯冷镦钢振痕缺陷的控制方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2825947A (en) * 1955-10-14 1958-03-11 Norman P Goss Method of continuous casting of metal
US3052936A (en) * 1956-10-01 1962-09-11 Babcock & Wilcox Co Method of continuously casting metals
US3318363A (en) * 1965-03-18 1967-05-09 Oglebay Norton Co Continuous casting method with degassed glass-like blanket
US3642052A (en) * 1969-03-21 1972-02-15 Mannesmann Ag Process of continuous casting of steel
US3649249A (en) * 1970-07-06 1972-03-14 Inland Steel Co Continuous casting slag and method of making
US3704744A (en) * 1971-10-22 1972-12-05 Inland Steel Co Slag use in continuous casting of steel

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2825947A (en) * 1955-10-14 1958-03-11 Norman P Goss Method of continuous casting of metal
US3052936A (en) * 1956-10-01 1962-09-11 Babcock & Wilcox Co Method of continuously casting metals
US3318363A (en) * 1965-03-18 1967-05-09 Oglebay Norton Co Continuous casting method with degassed glass-like blanket
US3642052A (en) * 1969-03-21 1972-02-15 Mannesmann Ag Process of continuous casting of steel
US3649249A (en) * 1970-07-06 1972-03-14 Inland Steel Co Continuous casting slag and method of making
US3704744A (en) * 1971-10-22 1972-12-05 Inland Steel Co Slag use in continuous casting of steel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4311186A (en) * 1980-09-18 1982-01-19 Antonio Spaccarotella Method for quickly repairing break-outs in continuous casting plants

Also Published As

Publication number Publication date
ZA738282B (en) 1974-09-25
NL7314904A (fr) 1974-05-02
PL91148B1 (fr) 1977-02-28
IN140171B (fr) 1976-09-25
BR7308439D0 (pt) 1974-08-15
ES420075A1 (es) 1976-03-01
AT332015B (de) 1976-09-10
RO67595A (fr) 1981-06-26
JPS4994526A (fr) 1974-09-07
ATA909773A (de) 1975-12-15
IT999709B (it) 1976-03-10
AU6182973A (en) 1975-05-01
FR2204472A1 (fr) 1974-05-24
BE806527A (fr) 1974-04-25
AU468866B2 (en) 1976-01-22
AR198885A1 (es) 1974-07-24
CA997123A (en) 1976-09-21
GB1449234A (en) 1976-09-15
DE2354560A1 (de) 1974-05-02

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Legal Events

Date Code Title Description
AS Assignment

Owner name: USX CORPORATION, A CORP. OF DE, STATELESS

Free format text: MERGER;ASSIGNOR:UNITED STATES STEEL CORPORATION (MERGED INTO);REEL/FRAME:005060/0960

Effective date: 19880112