EP0215874B1 - Frettes de rouleaux de coulee continue - Google Patents

Frettes de rouleaux de coulee continue Download PDF

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Publication number
EP0215874B1
EP0215874B1 EP86901895A EP86901895A EP0215874B1 EP 0215874 B1 EP0215874 B1 EP 0215874B1 EP 86901895 A EP86901895 A EP 86901895A EP 86901895 A EP86901895 A EP 86901895A EP 0215874 B1 EP0215874 B1 EP 0215874B1
Authority
EP
European Patent Office
Prior art keywords
thermal
hoop
continuous casting
hoops
stresses
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
EP86901895A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0215874A1 (fr
Inventor
Joseph-Jean Terrasse
André-Robert BOUCHER
Michel Seux
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.)
Chavanne Ketin SA
Original Assignee
Chavanne Ketin SA
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 Chavanne Ketin SA filed Critical Chavanne Ketin SA
Priority to AT86901895T priority Critical patent/ATE36820T1/de
Publication of EP0215874A1 publication Critical patent/EP0215874A1/fr
Application granted granted Critical
Publication of EP0215874B1 publication Critical patent/EP0215874B1/fr
Expired 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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • 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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/0648—Casting surfaces
    • B22D11/0651—Casting wheels

Definitions

  • the invention relates to hoops of continuous casting rolls of aluminum alloy, these hoops having an improved lifetime compared to the hoops made of traditional steels, and retaining good productivity in the casting machine.
  • the molten metal is directly cast at a temperature of approximately 680 ° C, between a pair of cooled rollers rotating in opposite directions, which fulfill the double function of solidification of the strip metal and rolling. of this metal.
  • rollers To obtain maximum productivity from the installation, the rollers must be cooled efficiently and have good thermal conductivity in order to promote the evacuation of calories.
  • These rollers are produced in two parts a central core comprising cooling means and a hoop which is mounted on this core and comes directly into contact with the cast aluminum. Rolls of this type are already known from patent application FR-A-2 217 098.
  • This hoop constitutes the part of the roller receiving the most intense stresses and, after a certain number of operating hours, must be revised due to the thermal cracks which have developed.
  • the first characteristic that is required of a material, to produce frets of a continuous casting machine, is good thermal conductivity.
  • these frets are subjected, in operation, to a certain number of constraints, of mechanical origin, namely: hooping, bending, torsion. These constraints impose a minimum of mechanical strength and toughness.
  • the main stress is thermal cycling which causes plastic fatigue of the surface, initiation and propagation of a network of micro-cracks.
  • This deterioration requires periodic reconditioning of the hoop, an operation which consists in eliminating, by machining, the thickness of deteriorated metal.
  • the object of the present invention is to provide new continuous aluminum casting hoops which, while preserving a high productivity of the installation linked to good thermal conductivity, provide a service life at least comparable to the best products currently used, this thanks to the use of an alloy steel having a high resistance to fatigue of thermal origin.
  • the principle of light alloy continuous casting shown in Figs. 1 and 2 relates to so-called horizontal casting.
  • the aluminum, melted in an oven which is not shown, is maintained at constant level in a supply channel 1 and introduced, by means of a nozzle 2, between two rollers 3, at a temperature of around 680 ° C. .
  • the rollers (or cylinders) 3 are rotated in opposite directions with a spacing which determines the thickness of the solidified sheet 4.
  • the rolling grip constitutes a continuous ingot mold in which, in contact with the cold cylinders, the aluminum of casting solidifies, while it is driven by the rotation of the cylinders.
  • this hoop must have good thermal conductivity, but also appropriate mechanical properties due to the constraints to which it is subjected.
  • the stress regime, at each point of the frets, is defined by the sum of the stresses of mechanical origin and the stresses of thermal origin due to the cycling of the thermal gradient.
  • the internal face can be considered, at constant temperature, close to that of the cooling water.
  • the external face comes, at each rotation, into contact with the liquid aluminum, then when the sheet comes out of the grip, the hoop is cooled by the ambient air, and by the thermal transfer towards the cooling fluid.
  • the first heating is represented by the line OA, then by the curve AB, which corresponds to the plastic strain on the stress-strain diagram in Fig. 3.
  • the predominant stresses are those induced by the thermal cycle (which, of course, are superimposed, even modest stresses, of mechanical origin).
  • the fatigue resistance of thermal origin appears directly linked to the mechanical characteristics of the steel at the stress temperatures, and in particular, directly linked to the limit of elasticity of the material.
  • the search for a steel composition optimized for continuous casting hoops consists in using, at best, the alloying elements in order to obtain the best resistance with a thermal conductivity little modified compared to standard steels.
  • the selection criteria are, of course, the mechanical characteristics of the steel.
  • thermal fatigue is a complex mechanism. Besides the effect of the stresses generated by the cycling of the thermal gradient, it integrates the effects of external aggressions, and those of internal modifications of the material, which influence the formation and the development of the network of cracks.
  • the cast iron frets according to the present invention are produced from a steel grade produced in an electric oven, cast in a pocket where it is refined and degassed, then finally cast in an ingot mold.
  • the ingots are heated to approximately 1200 ° C., drilled to obtain blanks which are themselves forged into tubes of 500 to 1000 mm in diameter. These blanks are then austenitized at around 970 ° C., then quenched and subjected to tempering to give them the required metallurgical quality.
  • the grades according to the present invention are characterized by a simplicity of implementation during hot transformation and subsidiary treatments for refining the structure in order to obtain the best ductility properties, which is difficult to obtain for grades with higher carbon content or containing more alloying elements.
  • Table 1 below indicates the weight compositions of the various steels tested, for comparison purposes.
  • This device comprises a finely rectified cylindrical test piece, which is intermittently heated at the surface by high frequency induction and which is permanently cooled internally by a circulation of water.
  • test piece The definition of the test piece, the power of the generator, the self-test piece coupling, the cooling, made it possible to define a thermal cycle inspired by the temperature measurements recorded on real frets in operation.
  • the test results are plotted on a histogram shown in FIG. 4, where the numbers and the depths of the cracks are shown.
  • the mechanism of cracking is always similar the cracks which were born first, starting from the micro-accidents of surfaces, are those which develop most in depth. Then forms a network of minor cracks of lesser importance.
  • the criterion used is the maximum depth of the main cracks: these are the cracks which determine, on a hoop, the quantity of metal to be removed to renovate its work surface.
  • the improvement of the fatigue resistance of thermal origin consists in an unexpected reduction of the mesh of the network of the principal cracks and in a reduction in the maximum depths of the cracks, all other things being equal.
  • the frequency of the first initiated cracks is approximately one to two cracks per linear centimeter. These main cracks which penetrate deeply determine the duration of use of the hoop before its repair.
  • the frequency of cracks which are initiated approximately simultaneously is much higher.
  • the distribution of deformations and stresses due to thermal cycling is thereby distributed, which contributes to the lesser penetration of degradation by thermal fatigue.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Metal Rolling (AREA)
  • Heat Treatment Of Steel (AREA)
  • Forging (AREA)
  • Heat Treatment Of Articles (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Nonmetallic Welding Materials (AREA)
  • Braking Arrangements (AREA)
EP86901895A 1985-03-15 1986-03-14 Frettes de rouleaux de coulee continue Expired EP0215874B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86901895T ATE36820T1 (de) 1985-03-15 1986-03-14 Maentel fuer stranggiessrollen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8503867A FR2578768B1 (fr) 1985-03-15 1985-03-15 Frettes de rouleaux de coulee continue
FR8503867 1985-03-15

Publications (2)

Publication Number Publication Date
EP0215874A1 EP0215874A1 (fr) 1987-04-01
EP0215874B1 true EP0215874B1 (fr) 1988-08-31

Family

ID=9317244

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86901895A Expired EP0215874B1 (fr) 1985-03-15 1986-03-14 Frettes de rouleaux de coulee continue

Country Status (9)

Country Link
US (1) US4802528A (es)
EP (1) EP0215874B1 (es)
JP (1) JP2650679B2 (es)
KR (1) KR960015337B1 (es)
AT (1) ATE36820T1 (es)
DE (1) DE3660610D1 (es)
ES (1) ES8707878A1 (es)
FR (1) FR2578768B1 (es)
WO (1) WO1986005423A1 (es)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6130654A (ja) * 1984-07-21 1986-02-12 Kanto Tokushu Seikou Kk アルミニウム連続鋳造用ロ−ルシエル鋼
US5626183A (en) * 1989-07-14 1997-05-06 Fata Hunter, Inc. System for a crown control roll casting machine
ES2083982T3 (es) * 1989-07-14 1996-05-01 Hunter Eng Co Regulacion de la flexion en una maquina de colada entre rodillos.
US5059428A (en) * 1990-03-12 1991-10-22 Warner-Lambert Company Synergistic sweetening compositions containing polydextrose and a chlorodeoxysurgar and methods for preparing same
JP2953304B2 (ja) * 1994-05-18 1999-09-27 関東特殊製鋼株式会社 薄板連続鋳造機用ロール外筒材
US5599497A (en) * 1995-07-26 1997-02-04 National-Oilwell, L.P. Alloy steel roll caster shell
FR2758751B1 (fr) * 1997-01-29 1999-02-26 Forcast Int Frette de coulee continue de metal ou alliage metallique, notamment d'aluminium
KR20010065798A (ko) * 1999-12-30 2001-07-11 윤영석 내열충격성이 우수한 알미늄연속주조기용 롤쉘
JP3867769B2 (ja) * 2001-03-26 2007-01-10 徹一 茂木 板状金属素材の製造方法および装置
ITVI20060273A1 (it) * 2006-09-07 2008-03-08 Fata Hunter Division Of Fata Spa Acciaio preferibilmente per la realizzazione di rivestimenti (camicie) di rulli di colata per alluminio e sue leghe e relativo trattamento termico
JP5425675B2 (ja) * 2010-03-18 2014-02-26 愛知製鋼株式会社 無段変速機ベルト及び無段変速機ベルト用鋼

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3587708A (en) * 1968-02-21 1971-06-28 Georgy Lukich Khim Method of continuous sheet metal production
FR2217098A1 (en) * 1973-02-13 1974-09-06 Scal Gp Condit Aluminium Continuous casting appts of improved output capacity - by lining surfaces in contact with liq metal with a highly heat conductive material eg copper (alloys)
SE419101B (sv) * 1976-12-17 1981-07-13 Uddeholms Ab Berarmaterial for verktyg av bimetall der det arbetande materialet utgores av snabbstal
JPS559942A (en) * 1978-07-05 1980-01-24 Tokuzo Hirose Water storage bag for securing service water or sea water
FR2464741A1 (fr) * 1979-09-07 1981-03-20 Usinor Cylindre composite de compactage
JPS56151149A (en) * 1980-04-23 1981-11-24 Kubota Ltd Assembling type roll for continuous casting of slab
JPS59174253A (ja) * 1983-03-22 1984-10-02 Furukawa Battery Co Ltd:The 鉛基合金の連続鋳造圧延製造法

Also Published As

Publication number Publication date
ES8707878A1 (es) 1987-09-01
JP2650679B2 (ja) 1997-09-03
DE3660610D1 (en) 1988-10-06
JPS62502599A (ja) 1987-10-08
US4802528A (en) 1989-02-07
ES553346A0 (es) 1987-09-01
ATE36820T1 (de) 1988-09-15
EP0215874A1 (fr) 1987-04-01
KR960015337B1 (ko) 1996-11-09
FR2578768B1 (fr) 1988-05-06
WO1986005423A1 (fr) 1986-09-25
KR870700104A (ko) 1987-03-14
FR2578768A1 (fr) 1986-09-19

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