EP0082810B1 - Verfahren zum Kühlen eines Giessstranges während des Stranggiessens - Google Patents

Verfahren zum Kühlen eines Giessstranges während des Stranggiessens Download PDF

Info

Publication number
EP0082810B1
EP0082810B1 EP82810486A EP82810486A EP0082810B1 EP 0082810 B1 EP0082810 B1 EP 0082810B1 EP 82810486 A EP82810486 A EP 82810486A EP 82810486 A EP82810486 A EP 82810486A EP 0082810 B1 EP0082810 B1 EP 0082810B1
Authority
EP
European Patent Office
Prior art keywords
substance
cooling medium
cooling
strand
decomposition
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
Application number
EP82810486A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0082810A1 (de
Inventor
Raoul Sautebin
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.)
Rio Tinto Switzerland AG
Original Assignee
Schweizerische Aluminium AG
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 Schweizerische Aluminium AG filed Critical Schweizerische Aluminium AG
Priority to AT82810486T priority Critical patent/ATE17666T1/de
Publication of EP0082810A1 publication Critical patent/EP0082810A1/de
Application granted granted Critical
Publication of EP0082810B1 publication Critical patent/EP0082810B1/de
Expired legal-status Critical Current

Links

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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
    • B22D11/1245—Accessories for subsequent treating or working cast stock in situ for cooling using specific cooling agents

Definitions

  • the invention relates to a method for cooling a casting strand emerging from a continuous casting mold during the continuous casting of light metals, in particular aluminum and aluminum alloys, by applying coolant directly to the surface of the strand, in which carbon dioxide or nitrogen gas is released from the coolant at least during the start-up process.
  • heat is removed from the casting strand emerging from the mold by applying coolant to the surface of the strand directly below the mold.
  • the coolant initially only touches the start-up floor.
  • the indirect heat removal that occurs leads to a mild solidification of the liquid metal and to an even formation of the strand base.
  • the coolant hits the surface of the strand, which is associated with a sudden increase in heat dissipation from the casting strand.
  • the thermal stresses that occur as a result of this temperature shock are greater than the tensile strength of the cast strand and lead to permanent deformation in the form of a convex curvature of the strand base and, if the tensile strength is exceeded, also to cracks in the strand.
  • the strand In order to obtain a casting strand with a flat foot, the strand must not be cooled too much during the start-up process.
  • the coolant contains a gas introduced under pressure, for example carbon dioxide or nitrogen, at least during the start-up process.
  • a gas introduced under pressure for example carbon dioxide or nitrogen
  • the inventor has set itself the goal of improving a method of the type mentioned at the outset in such a way that the disadvantages mentioned above are eliminated.
  • this object is achieved in that a substance is added to the coolant, which releases the gas as a decomposition product when it hits the hot strand surface.
  • the principle of reducing the cooling intensity by means of an insulating film made of gases can be implemented in a simple manner.
  • the substance can be fed in a highly concentrated form - for example as a saturated solution - from a storage container via a metering pump into a coolant supply line. Since the gas is only formed by the decomposition of the substance when it hits the hot strand surface, no special pressure and mixing devices are required.
  • Suitable substances for carrying out the process are those which give off carbon dioxide or nitrogen when they are decomposed, since they show good solubility in the coolant and do not give off aggressive or harmful gases when decomposed.
  • hydrogen carbonates in particular sodium or ammonium bicarbonate
  • Organic compounds in solution with at least one carboxyl group - for example acids or esters - can also be used.
  • the method can be further developed by adding acid to the substance.
  • substances which release nitrogen as a decomposition product are particularly suitable because they are not in an aqueous equilibrium with nitrogen and consequently show a behavior which is independent of the pH.
  • Ammonium nitrite is particularly suitable as a substance for water as a coolant. This can also be introduced into the coolant as an equimolar mixture of sodium nitrite and ammonium nitrate.
  • the method according to the invention can be implemented both with conventional and with electromagnetic continuous casting molds and is suitable for casting light metals, in particular aluminum and aluminum alloys.
  • concentration of the substance depends on the desired reduction in cooling intensity and is usually on the order of 10- 1 to 10- 3 mol / liter.
  • the supply of the substance to the coolant can be interrupted. If the method is carried out in another way, the concentration of the substance in the coolant is continuously reduced during the start-up process. In certain cases, however, it may prove expedient to maintain the method according to the invention during the entire casting process.
  • an alloy 3004 was cast under normal conditions into bars of the format 500 mm x 1600 mm.
  • the cooling water supply was kept constant at 600 liters / minute during the entire casting process.
  • the substances listed in the table were mixed with the cooling water up to a strand length of 100 mm.
  • a saturated aqueous solution of the respective substance was fed from a storage tank directly into the main via a metering pump Cooling water pipe fed.
  • the concentrations of the substances set in the cooling water are also included in the table.
  • the feed of the substances was interrupted after the start-up during the further pouring process.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Moulding By Coating Moulds (AREA)
  • Lubricants (AREA)
  • Thermotherapy And Cooling Therapy Devices (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
EP82810486A 1981-11-20 1982-11-12 Verfahren zum Kühlen eines Giessstranges während des Stranggiessens Expired EP0082810B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82810486T ATE17666T1 (de) 1981-11-20 1982-11-12 Verfahren zum kuehlen eines giessstranges waehrend des stranggiessens.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH7448/81 1981-11-20
CH744881 1981-11-20

Publications (2)

Publication Number Publication Date
EP0082810A1 EP0082810A1 (de) 1983-06-29
EP0082810B1 true EP0082810B1 (de) 1986-01-29

Family

ID=4325286

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82810486A Expired EP0082810B1 (de) 1981-11-20 1982-11-12 Verfahren zum Kühlen eines Giessstranges während des Stranggiessens

Country Status (10)

Country Link
US (1) US4508160A (enExample)
EP (1) EP0082810B1 (enExample)
JP (1) JPS5893547A (enExample)
AT (1) ATE17666T1 (enExample)
AU (1) AU555975B2 (enExample)
CA (1) CA1201870A (enExample)
DE (1) DE3268893D1 (enExample)
IS (1) IS1378B6 (enExample)
NO (1) NO157771C (enExample)
ZA (1) ZA828273B (enExample)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3239042A1 (de) * 1982-10-22 1984-04-26 SMS Schloemann-Siemag AG, 4000 Düsseldorf Vorrichtung zum aufspruehen eines treib- und kuehlmittelgemisches auf eine stahlbramme
US4610295A (en) * 1983-11-10 1986-09-09 Aluminum Company Of America Direct chill casting of aluminum-lithium alloys
AU589704B2 (en) * 1985-11-25 1989-10-19 Swiss Aluminium Ltd. Device and process for the continuous casting of metals
NO165711C (no) * 1988-04-15 1991-03-27 Norsk Hydro As Stoepeanordning for kontinuerlig eller semi-kontinuerlig stoeping av metall.
US6264767B1 (en) 1995-06-07 2001-07-24 Ipsco Enterprises Inc. Method of producing martensite-or bainite-rich steel using steckel mill and controlled cooling
WO2000003042A1 (en) 1998-07-10 2000-01-20 Ipsco Inc. Method and apparatus for producing martensite- or bainite-rich steel using steckel mill and controlled cooling
FI20001945L (fi) * 2000-09-05 2002-03-06 Outokumpu Oy Jäähdytysmenetelmä ja- laitteisto ylöspäin tapahtuvan metallien jatkuvavalun yhteydessä

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3397734A (en) * 1966-05-31 1968-08-20 Standard Oil Co Polybutene continuous metal casting lubrication process
US3543831A (en) * 1967-01-09 1970-12-01 United Aircraft Corp Electrostatic coatings
US4166495A (en) * 1978-03-13 1979-09-04 Aluminum Company Of America Ingot casting method

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Chemical Abstracts Band 87, Nr. 8, 4. Juli bis 18. Juli 1977, Columbus, Ohio, USA, Teregerya et al. "Lubricant-coolant fluid for the mechanical working of metals", Seite 156, Abstract Nr.8503 h *
Chemical Abstracts Band 92, Nr. 8, 26. Mai bis 9. Juni 1980, Columbus, Ohio, USA, Molokhov et al. "Lubricant-coolant for metalworking", Seite 135, Abstract Nr. 183506 m *

Also Published As

Publication number Publication date
NO823859L (no) 1983-05-24
NO157771C (no) 1988-05-18
IS2761A7 (is) 1983-05-21
AU9038282A (en) 1983-05-26
DE3268893D1 (en) 1986-03-13
AU555975B2 (en) 1986-10-16
NO157771B (no) 1988-02-08
ATE17666T1 (de) 1986-02-15
CA1201870A (en) 1986-03-18
EP0082810A1 (de) 1983-06-29
ZA828273B (en) 1983-09-28
JPH0215301B2 (enExample) 1990-04-11
IS1378B6 (is) 1989-08-28
JPS5893547A (ja) 1983-06-03
US4508160A (en) 1985-04-02

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