EP0342082A1 - Verfahren zur Kühlung eines metallischen Stranggussproduktes - Google Patents

Verfahren zur Kühlung eines metallischen Stranggussproduktes Download PDF

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Publication number
EP0342082A1
EP0342082A1 EP89401150A EP89401150A EP0342082A1 EP 0342082 A1 EP0342082 A1 EP 0342082A1 EP 89401150 A EP89401150 A EP 89401150A EP 89401150 A EP89401150 A EP 89401150A EP 0342082 A1 EP0342082 A1 EP 0342082A1
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EP
European Patent Office
Prior art keywords
cooling
product
pasty
core
continuous casting
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.)
Granted
Application number
EP89401150A
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English (en)
French (fr)
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EP0342082B1 (de
Inventor
Manuel Bobadilla
Michel Martinot
Jean-Marc Jolivet
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.)
ASCOMETAL EN UGINE EN UNIMETAL SOCIETE FRANCAISE D
Original Assignee
Institut de Recherches de la Siderurgie Francaise IRSID
Unimetal SA
Ugine SA
Ascometal SA
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Publication date
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Application filed by Institut de Recherches de la Siderurgie Francaise IRSID, Unimetal SA, Ugine SA, Ascometal SA filed Critical Institut de Recherches de la Siderurgie Francaise IRSID
Priority to AT89401150T priority Critical patent/ATE91656T1/de
Publication of EP0342082A1 publication Critical patent/EP0342082A1/de
Application granted granted Critical
Publication of EP0342082B1 publication Critical patent/EP0342082B1/de
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

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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
    • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling

Definitions

  • the present invention relates to a method of cooling a metal product during continuous casting intended to reduce, or even eliminate the presence of a large segregated zone in the central part of the product.
  • This process is advantageously applicable to the continuous casting of steel products known to be difficult to cast according to this technique, such as steels having a wide solidification interval, that is to say for example those whose carbon content is between 0, 25 and 1.5% approximately.
  • the product in the course of solidification as the combination of three concentric bodies, namely: a ring formed by the outer crust, or skin, already solidified, enclosing another pasty ring which surrounds the liquid core of molten metal.
  • pasty state is meant a state where the metal is at a temperature between the liquidus and the solidus, and where coexist in variable proportions of the liquid metal and solid crystals.
  • the interfaces between these various concentric bodies constitute, respectively, as we are used to designating them, the fronts of ending and beginning solidification.
  • the liquid core disappears (bottom of the beginning solidification well), and only a solidified crust and a pasty core remain.
  • the pasty zone disappears in turn (closing of the finishing solidification well) and the product is completely solidified.
  • Solidification and cooling of the product during casting are normally ensured in three successive zones of the continuous casting machine, namely, in the direction of progression of the product during its extraction: - the ingot mold, where the liquid metal comes into contact with walls that are good conductors of heat and energetically cooled by circulation of water. It is in this zone, called primary cooling that the formation of the solidified skin begins which encloses the liquid core of the product, and that the product takes its final form; - the so-called “secondary cooling” zone, which begins just below the mold and extends over a variable length according to local conditions.
  • the solidified skin of the moving product is sprayed with a cooling fluid (generally water spray, or an air-water mixture), which has the effect of accelerating the progression of the beginning and ending solidification fronts. inward of the product.
  • a cooling fluid generally water spray, or an air-water mixture
  • complete solidification of the product is not carried out, and the core of the product remains in the liquid state; - and the portion of the machine that follows the secondary cooling zone.
  • the scrolling product is no longer watered there and cools naturally. It is in this area that the solidification of the product core ends.
  • the forced cooling of the product in the mold and after its exit from the mold provides rapid growth in the thickness of solidified skin, in order to limit the risks of breakthrough and significantly increase the speed of extraction of the product, on which the productivity of the continuous casting machine.
  • the solubility in iron of alloying elements is lower when the iron is in the solid state than in the liquid state.
  • alloying elements such as carbon
  • the other alloying elements have a behavior similar to that of carbon, and the location of the segregated zones can be deduced from the tests commonly called "Baumann imprints" which make it possible to identify the distribution of the sulfur on a polished section of the product.
  • These segregated zones also identifiable on metallographic attacks, have a detrimental influence on the homogeneity of the mechanical properties of the product.
  • the relatively higher concentration of carbon in the center leads to higher hardness in these areas than in the rest of the product after rolling.
  • the object of the present invention is to propose a simple and economical solution for reducing, or even eliminating the highly segregated zones in the core of the continuously cast products, by attacking the very cause responsible for their formation. It can be added to or a substitute for electromagnetic stirring in the end of pasty solidification zone.
  • the subject of the invention is a method of cooling a metal product, in particular steel, during continuous casting, characterized in that a forced cooling of the product is carried out, while the product is in pasty solidification phase, this cooling being carried out so that the differential thermal contraction between the pasty core and the already completely solidified crust which envelops it, permanently causes a tightening effect of the heart by the crust.
  • This cooling is carried out in an area which extends at least between the place where, in the absence of such cooling, the rate of cooling of the pasty core of the product would exceed that of the surface of the product, and a place where the thermomechanical behavior of the pasty core during cooling is identical to that of the solidified outer crust.
  • the invention consists in fact in using the solidified outer crust as a vice which accompanies the contraction of the heart during cooling.
  • the inside diameter of the ring formed by the solidified crust must decrease faster than the diameter of the pasty core would decrease if the crust had no effect on the heart.
  • This vice is put into action, by thermal, simply by means of an accelerated cooling of the surface of the product in the lower part of the machine, where usually the product was allowed to cool naturally.
  • Figure 1 is a schematic longitudinal section of a conventional continuous casting installation, and in particular it shows the product being solidified.
  • a pocket not shown, feeds liquid steel 1 to a distribution basket 2.
  • the liquid steel 1 then flows into one or more ingot molds 3 with copper or copper alloy walls energetically cooled by water. It is in each of these ingot molds or primary cooling zones X that the solidification of a product 4 begins at its periphery, which thus takes its final section.
  • the mold shown in Figure 1 has a curvature, and it is found on the product. The case of the right ingot mold giving birth to a right product is also encountered in industrial practice.
  • the secondary cooling zone Y in which the product 4 is sprayed over a variable length depending on the machines by a ramp of injectors 5. These project all around the product a cooling fluid , usually sprayed or atomized water.
  • a cooling fluid usually sprayed or atomized water.
  • FIG. 1 makes it possible to distinguish several concentric regions inside the product during casting, corresponding to the physical state of the material which they contain.
  • a section of the product located in the upper part of the machine for example in zone Y
  • the metal is entirely in the liquid state; the section of this zone decreases as the product solidifies, and after the point of closure of the liquid well 7, there is no longer any liquid metal alone.
  • a pasty region 8 corresponding to the metal being solidified, contains both liquid and solid. The portion of the latter increases as the temperature decreases.
  • the crust 9 consists only of solidified metal. Beyond the closing point of the ending solidification well 10, this region 9 covers the entire product, the solidification of which is then completed.
  • Figure 2 shows the continuous casting machine of Figure 1 modified according to the invention.
  • the elements common with Figure 1 are identified by the same numbers.
  • the difference between the two configurations lies in the addition to the original machine of a second injector ramp 11, located in the zone Z of the machine where the product completes its solidification.
  • FIG. 3 shows examples of changes in the speed V of changes in the temperature of the metal at the surface and at the core as the product advances in the zone Z of the machine where it completes its solidification. This advancement is expressed by the distance D to the meniscus, that is to say to the surface of the molten metal in an ingot mold.
  • the curves were plotted using mathematical models similar to those available to users of continuous casting machines. They are valid for the following casting conditions: - product format: square section billets, 105 mm side, - product composition: steel with 0.7% carbon. - product extraction speed: 3.3 m / min.
  • Curves A and B correspond to the case of FIG. 1, where the product, in the terminal part of the machine, is not subjected to any forced cooling.
  • Curve A represents the rate of change of the surface temperature of the product. It shows that this speed remains substantially constant (a loss of 0.5 ° C / s) over the entire length of the zone considered.
  • Curve B represents the rate of change of the temperature of the pasty core of the product. It shows that, at the start of the zone considered, this temperature remains practically constant. It is only from a distance to the meniscus of approximately 8 m that the cooling of the pasty heart accelerates significantly. Beyond a distance to the meniscus of 9.5 m, the pasty heart begins to lose more than 0.5 ° C / s, and therefore to cool faster than the surface. This leads to a stronger thermal contraction of the heart than that of the surface, a phenomenon which we have seen that, according to the hypothesis made by the inventors, it was the source of the defects in the product which the invention aims to 'to avoid.
  • Curves C and D correspond to the case of FIG. 2, where the product, in accordance with the invention, is subjected to forced cooling in the zone Z at the end of solidification by means of the injector ramp 11. These curves have been traced in the hypothesis where the product is watered, between the distances at meniscus 8.40 m and 11.20 m, with water at a flow rate of 12 m3 per hour and per m2 of product sprayed, this flow being distributed evenly over the entire watering area.
  • Curve C represents the rate of change in temperature of the surface of the product
  • curve D represents the rate of change in temperature of the pasty core. Upstream of the cooling zone, these curves merge with curves A and B respectively.
  • the recommended cooling water flows are of the order of 8 to 15 m3 / h and per m2 of sprinkled metal. Preferably, a flow rate of 12 m3 / m2 is chosen. h.
  • This process is easily adaptable to all continuous casting machines intended for the manufacture of steel products. It is more specifically designed for the casting of steel grades containing approximately from 0.25 to 1.5% of carbon.
  • a variant of this process would consist in designing the cooling ramp 11 so that the flow of cooling fluid varies between the start and the end of the cooling zone.
  • the value of the average overall flow over the entire area would be unchanged compared to the configuration described above. In this way, it would be possible to better control the flow of heat extracted from the product along the cooling zone, in order to attenuate the decrease, visible in FIG. 3, of the rate of cooling on the surface of the product. Thus, one would increase the probability of having until the extreme end of solidification a cooling in heart slower than in skin.
  • the invention is not limited to the examples described, but extends to multiple variants or equivalents insofar as the characteristics mentioned in the appended claims are respected.
  • the method according to the invention can be applied to vertical, straight or curved continuous casting machines, as well as to horizontal continuous casting machines, as well as to existing or future installations for casting. direct continuous of thin products.
  • the invention does not apply restrictively to steel semi-finished products, but extends its field of application to any metallurgical product which is poured continuously, or which may be.
  • the invention applies equally to any metallurgical product poured continuously whatever its format: blooms, bilettes or slabs, in particular those intended for slitting to form blooms.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Heat Treatment Of Articles (AREA)
EP89401150A 1988-05-13 1989-04-21 Verfahren zur Kühlung eines metallischen Stranggussproduktes Revoked EP0342082B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89401150T ATE91656T1 (de) 1988-05-13 1989-04-21 Verfahren zur kuehlung eines metallischen stranggussproduktes.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8806743A FR2631263B1 (fr) 1988-05-13 1988-05-13 Procede de refroidissement d'un produit metallique coule en continu
FR8806743 1988-05-13

Publications (2)

Publication Number Publication Date
EP0342082A1 true EP0342082A1 (de) 1989-11-15
EP0342082B1 EP0342082B1 (de) 1993-07-21

Family

ID=9366459

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89401150A Revoked EP0342082B1 (de) 1988-05-13 1989-04-21 Verfahren zur Kühlung eines metallischen Stranggussproduktes

Country Status (19)

Country Link
US (1) US5063991A (de)
EP (1) EP0342082B1 (de)
JP (1) JPH0215856A (de)
KR (1) KR960004423B1 (de)
CN (1) CN1018803B (de)
AT (1) ATE91656T1 (de)
AU (1) AU611797B2 (de)
BR (1) BR8902241A (de)
CA (1) CA1338164C (de)
CS (1) CS287289A3 (de)
DD (1) DD284175A5 (de)
DE (1) DE68907644T2 (de)
ES (1) ES2042023T3 (de)
FR (1) FR2631263B1 (de)
PL (1) PL279425A1 (de)
PT (1) PT90543B (de)
RU (1) RU1819188C (de)
UA (1) UA15737A (de)
ZA (1) ZA893402B (de)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5725046A (en) * 1994-09-20 1998-03-10 Aluminum Company Of America Vertical bar caster
JPH08234390A (ja) * 1995-02-24 1996-09-13 Fuji Photo Film Co Ltd 画像形成方法およびハロゲン化銀感光材料
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
FR2767273B1 (fr) * 1997-08-14 1999-10-15 Vallourec Ind Procede de fabrication par coulee continue de produits en acier
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
JP5145791B2 (ja) 2007-06-28 2013-02-20 新日鐵住金株式会社 小断面ビレットの連続鋳造方法
WO2009066929A2 (en) * 2007-11-19 2009-05-28 Posco Continuous cast slab and method for manufacturing the same
CA2817810C (en) * 2010-12-22 2015-02-10 Novelis Inc. Elimination of shrinkage cavity in cast ingots
CN102161090B (zh) * 2010-12-23 2012-11-07 中国科学院金属研究所 一种提高厚大断面铸坯自补缩能力的方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3512574A (en) * 1966-12-02 1970-05-19 Inland Steel Co Continuous casting process and apparatus
US3771584A (en) * 1971-01-08 1973-11-13 Roblin Industries Method for continuously casting steel billet strands to minimize the porosity and chemical segregation along the center line of the strand
LU67753A1 (de) * 1972-06-08 1973-12-14
FR2211305A1 (de) * 1972-12-21 1974-07-19 Cem Comp Electro Mec
FR2231454A2 (en) * 1973-05-29 1974-12-27 Cem Comp Electro Mec Slab casting machine - with metal stirring by electrically wound withdrawal rolls
FR2315344A1 (fr) * 1975-06-27 1977-01-21 Siderurgie Fse Inst Rech Lingotiere de coulee continue electrorotative
EP0054867A1 (de) * 1980-12-23 1982-06-30 Neue Hamburger Stahlwerke GmbH Verfahren zum Kühlen von Strängen beim Stranggiessen von Stahl

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3502133A (en) * 1967-03-03 1970-03-24 Reynolds Metals Co Continuous casting method and apparatus for controlling freeze line location
CH559586A5 (de) * 1973-06-04 1975-03-14 Concast Ag
JPS5342131A (en) * 1976-09-29 1978-04-17 Hitachi Ltd Method of cooling cast piece in continuous casting
JPS57142752A (en) * 1981-02-27 1982-09-03 Kawasaki Steel Corp Slab casting method in vertically bent type continuous casting machine
US4617067A (en) * 1981-08-06 1986-10-14 Vallourec Process for the production of semi-finished articles of hard steels using a continuous casting operation
SE432893B (sv) * 1982-09-14 1984-04-30 Asea Ab Anordning vid kontinuerlig gjutning for omrorning av de icke-stelnade partierna av en gjutstreng
JPS5987962A (ja) * 1982-11-12 1984-05-21 Nippon Steel Corp 連続鋳造方法
JPS61119360A (ja) * 1984-11-16 1986-06-06 Sumitomo Metal Ind Ltd 鋼の連続鋳造方法
JPS62263855A (ja) * 1986-05-08 1987-11-16 Kawasaki Steel Corp 中心偏析の少ない連続鋳造方法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3512574A (en) * 1966-12-02 1970-05-19 Inland Steel Co Continuous casting process and apparatus
US3771584A (en) * 1971-01-08 1973-11-13 Roblin Industries Method for continuously casting steel billet strands to minimize the porosity and chemical segregation along the center line of the strand
LU67753A1 (de) * 1972-06-08 1973-12-14
FR2211305A1 (de) * 1972-12-21 1974-07-19 Cem Comp Electro Mec
FR2231454A2 (en) * 1973-05-29 1974-12-27 Cem Comp Electro Mec Slab casting machine - with metal stirring by electrically wound withdrawal rolls
FR2315344A1 (fr) * 1975-06-27 1977-01-21 Siderurgie Fse Inst Rech Lingotiere de coulee continue electrorotative
EP0054867A1 (de) * 1980-12-23 1982-06-30 Neue Hamburger Stahlwerke GmbH Verfahren zum Kühlen von Strängen beim Stranggiessen von Stahl

Also Published As

Publication number Publication date
DD284175A5 (de) 1990-11-07
FR2631263B1 (fr) 1990-07-20
ES2042023T3 (es) 1993-12-01
AU3392789A (en) 1989-11-16
CN1018803B (zh) 1992-10-28
ATE91656T1 (de) 1993-08-15
ZA893402B (en) 1990-01-31
AU611797B2 (en) 1991-06-20
JPH0215856A (ja) 1990-01-19
KR960004423B1 (ko) 1996-04-03
DE68907644D1 (de) 1993-08-26
KR890017020A (ko) 1989-12-14
DE68907644T2 (de) 1993-12-02
UA15737A (uk) 1997-06-30
PL279425A1 (en) 1989-12-27
PT90543A (pt) 1989-11-30
CA1338164C (fr) 1996-03-19
EP0342082B1 (de) 1993-07-21
RU1819188C (ru) 1993-05-30
US5063991A (en) 1991-11-12
FR2631263A1 (fr) 1989-11-17
PT90543B (pt) 1994-05-31
BR8902241A (pt) 1990-01-09
CS287289A3 (en) 1992-11-18
CN1038605A (zh) 1990-01-10

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APAH Appeal reference modified

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