EP0471608B1 - Procédé et dispositif de fabrication d'une bande en acier inoxydable semi-ferritique à partir de métal en fusion - Google Patents

Procédé et dispositif de fabrication d'une bande en acier inoxydable semi-ferritique à partir de métal en fusion Download PDF

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Publication number
EP0471608B1
EP0471608B1 EP91402200A EP91402200A EP0471608B1 EP 0471608 B1 EP0471608 B1 EP 0471608B1 EP 91402200 A EP91402200 A EP 91402200A EP 91402200 A EP91402200 A EP 91402200A EP 0471608 B1 EP0471608 B1 EP 0471608B1
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EP
European Patent Office
Prior art keywords
strip
ingot mould
cylinders
solidified
bath
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
EP91402200A
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German (de)
English (en)
French (fr)
Other versions
EP0471608A1 (fr
Inventor
Philippe Demarez
Jean-Michel Hauser
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.)
Thyssen Stahl AG
USINOR SA
Original Assignee
Thyssen Stahl AG
USINOR Sacilor 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 Thyssen Stahl AG, USINOR Sacilor SA filed Critical Thyssen Stahl AG
Publication of EP0471608A1 publication Critical patent/EP0471608A1/fr
Application granted granted Critical
Publication of EP0471608B1 publication Critical patent/EP0471608B1/fr
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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
    • B22D11/1241—Accessories for subsequent treating or working cast stock in situ for cooling by transporting the cast stock through a liquid medium bath or a fluidized bed
    • 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
    • B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C21D1/607—Molten salts
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys

Definitions

  • the subject of the present invention is a method and a device for manufacturing a strip of semi-ferritic stainless steel, from a bath of molten metal.
  • the invention relates to a continuous casting device, on two cylinders, of semi-ferritic stainless steel in thin strip.
  • ferri-ferritic means that the ferritic structure, whose crystallographic arrangement is cubic centered, is capable of transforming, at high temperature (900 - 1100 ° C), partially into an austenitic structure, whose crystallographic arrangement is cubic with centered faces.
  • the metal is solidified in a continuous casting mold made up of two cooled cylinders, rotating in opposite directions and arranged one opposite the other, with their parallel axes and at a determined spacing, defining between them a casting space. closed at opposite ends of the cylinders by closing plates.
  • the installation described in document EP-181,090 comprises a device for cooling a strip, of Fe-Si alloy for example, cast between two cylinders, installed just before a device for rolling and winding said strip.
  • this cooling device is installed very downstream of the mold, and on the other hand, it uses cooling medium code a gas or a mist, imposing only a relatively moderate cooling rate on the strip.
  • Document EP-A 0 378 705 describes a process for manufacturing a strip of austenitic stainless steel with fine grains.
  • the metal is solidified in a continuous casting mold with two cooled cylinders turning in opposite directions and arranged one opposite the other.
  • Cooling consists in imposing on the strip at the outlet of the cylinders (while it is at a temperature of about 1300 ° C.) first a first rapid forced cooling, or at a speed of the order (see example 1 p . 15-16) from 220 to 400 ° C / sec, but only for a very short time (about 1 sec), so as to bring the strip to a temperature of about 1200 ° C.
  • a first rapid forced cooling or at a speed of the order (see example 1 p . 15-16) from 220 to 400 ° C / sec, but only for a very short time (about 1 sec), so as to bring the strip to a temperature of about 1200 ° C.
  • the strip cools naturally at a low speed and undergoes hot rolling, then it finally undergoes a second forced cooling at a more moderate speed (50 ° C / sec is sufficient) which brings it in 3.5 - 4 sec from a temperature of 900-1000 ° C to a temperature of around 550
  • the invention therefore aims to provide a method and a device for eliminating these shortcomings.
  • the method includes the features mentioned in claim 1.
  • a bath of molten alloy based on lead, tin and zinc or two of these metals or a bath of only one of them is used as quenching medium.
  • ci, or a molten salt in which the lower part of the cylinders and the top of the strip are immersed, and said quenching means are prevented from being entrained by the running of the strip, for example by blowing jets of fluid on the strip at the outlet of the quench bath or using electromagnetic fields.
  • This mixture melts around 140 ° C and can be used between 160 and 500 ° C.
  • an inert gas refrigerated in the liquid state is used as the quenching means, which is projected onto the top of the strip on its opposite faces and under the cylinders.
  • the device intended for the implementation of this process comprises a continuous casting mold formed by two cooled cylinders, rotating in opposite directions and arranged one opposite the other so as to define a casting space between them, and quenching means to subject the solidified steel strip, under the mold, to cooling sufficiently rapid to prevent the formation of austenite.
  • quenching means to subject the solidified steel strip, under the mold, to cooling sufficiently rapid to prevent the formation of austenite.
  • these means make it possible to ensure a cooling rate of 300 ° C / s at least up to a temperature of the cast strip of around 500 ° C at least.
  • Figure 1 is a schematic end elevational view of a continuous casting device of a metal strip between two cylinders, equipped with a container placed under the cylinders and containing a liquid bath for quenching the strips extracted from the device.
  • Figure 2 is a schematic end elevational view, similar to Fig.1, of a second embodiment of the device according to the invention.
  • This device forms a mold for continuous casting, the cylinders 2 being cooled and driven in rotation in opposite directions to each other according to the arrows shown in Fig.1, by means known in themselves and not shown.
  • the device is completed by a container 4 placed under the cylinders 2, the bottom of which is pierced in its central zone with an opening 5 for passage of the strip. 3, and which contains a liquid bath 6 for quenching the strip 3.
  • the dimensions of the container 4 and the level of the bath 6 therein are such that the lower part of the cylinders 2 and the upper part of the strip 3 are scrolled are immersed in the bath 6.
  • the liquid bath 6 must be at a temperature which does not exceed 300 to 350 ° C. approximately, into which the strip 3 is therefore suddenly plunged at approximately 1300 ° C.
  • the bath 6 must be chosen from a non-polluting material which is prohibitive for the strip 3.
  • a quenching bath consisting by a molten alloy of lead, zinc and tin, or two of these metals, or a bath of only one of these metals. It is also possible to use a molten salt such as the above-mentioned mixture of sodium and potassium salts.
  • the casting device also comprises means for retaining the quenching liquid entrained by the movement of the strip 3.
  • these means consist of two rows of nozzles 7, placed under the bottom of the container 4 on each side of the strip 3, and oriented towards the intersection of the latter and the opening 5, so as to be able to project a fluid onto the surface of the strip 3 as it leaves the container 4.
  • the fluid may be water at room temperature (20 ° C for example) or a water-air atomized mixture at a sufficient flow rate to retain inside the container 4 the liquid of the bath 6.
  • this flow rate can be 50 m 3 / h for a linear speed of travel of the strip 3 of the order of 1 m / s, corresponding to cylinders 2 with a diameter of 1.50 m rotating at less than a quarter turn / second.
  • the latter In order to avoid the formation of austenite in the strip 3 during its cooling, the latter must be cooled from approximately 1300 ° C. to 500 ° C. at a speed of 300 ° C./s.
  • the abovementioned baths allow a cooling rate of approximately 2700 ° C./s.
  • the appropriate height of the bath 6 crossed by the strip 3 can be about 40cm, so that the strip 3 comes out of the bath at about 500 ° vs.
  • the strip can be deflected, for example by rollers, so as to leave the bath by crossing its surface.
  • Such an arrangement has the effect, at equal bath depth, of increasing the residence time of the strip in the bath compared to the configuration described above.
  • the second embodiment of the device (Fig. 2) targeted by the invention comprises, in addition to the cylinders 2, quenching means consisting in nozzles 8 for spraying a liquefied inert gas onto the solidified strip 3 immediately after it leaves the casting space.
  • quenching means consisting in nozzles 8 for spraying a liquefied inert gas onto the solidified strip 3 immediately after it leaves the casting space.
  • These nozzles 8 are arranged in two rows placed under the cylinders 2 on either side of the strip, in an arrangement similar to that of the nozzles 7 (Fig.1).
  • the blowing openings of the nozzles 8 are directed on the opposite faces of the upper part of the strip 3, immediately after its detachment from the surface of the cylinders 2.
  • the inert gas may for example be argon or nitrogen, used in the liquid state to benefit from its vaporization on contact with the solidified metal. This gas can be blown at a flow rate of 100,000 Nm 3 / h for example, for a running speed of
  • the device is advantageously completed by a cover 9 schematically represented, arranged under the mold formed by the cylinders 2, dimensioned so as to envelop both the rows of nozzles 8 and the strip 3 while being closed at its ends by means not shown. .
  • the cover 9 has at its lower end an opening 10 allowing the strip 3 to be extracted continuously, to an installation not shown. It makes it possible to confine the gas projected onto the strip 3, over a line length sufficient to ensure protection of said strip against surface oxidation by the surrounding air, adding to the quenching obtained by the projection of the inert gas by nozzles 8.
  • the metal obtained by the process and the device according to the invention is easier to shear and to wind at the outlet of the casting line, thanks to the almost total removal of martensite in the ferritic matrix.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Coating With Molten Metal (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Catalysts (AREA)
  • Artificial Fish Reefs (AREA)
  • Hydroponics (AREA)
EP91402200A 1990-08-13 1991-08-06 Procédé et dispositif de fabrication d'une bande en acier inoxydable semi-ferritique à partir de métal en fusion Expired - Lifetime EP0471608B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9010304A FR2665652A1 (fr) 1990-08-13 1990-08-13 Procede et dispositif de fabrication d'une bande en acier inoxydable semi-ferritique a partir de metal en fusion.
FR9010304 1990-08-13

Publications (2)

Publication Number Publication Date
EP0471608A1 EP0471608A1 (fr) 1992-02-19
EP0471608B1 true EP0471608B1 (fr) 1996-08-07

Family

ID=9399643

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91402200A Expired - Lifetime EP0471608B1 (fr) 1990-08-13 1991-08-06 Procédé et dispositif de fabrication d'une bande en acier inoxydable semi-ferritique à partir de métal en fusion

Country Status (17)

Country Link
US (1) US5201363A (cs)
EP (1) EP0471608B1 (cs)
JP (1) JP2919125B2 (cs)
AT (1) ATE141066T1 (cs)
AU (1) AU644672B2 (cs)
CA (1) CA2048769A1 (cs)
DE (1) DE69121222T2 (cs)
DK (1) DK0471608T3 (cs)
ES (1) ES2090274T3 (cs)
FI (1) FI95360C (cs)
FR (1) FR2665652A1 (cs)
GR (1) GR3020882T3 (cs)
IE (1) IE912856A1 (cs)
NO (1) NO179780C (cs)
PT (1) PT98623A (cs)
TW (1) TW198735B (cs)
ZA (1) ZA916292B (cs)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1029617B2 (en) † 1999-02-05 2017-01-04 Castrip, LLC Continuous casting steel strip method

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU676101B2 (en) * 1993-11-18 1997-02-27 Bluescope Steel Limited Casting stainless steel strip on surface with specified roughness
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
FR2763960B1 (fr) * 1997-05-29 1999-07-16 Usinor Procede de fabrication de bandes minces d'acier inoxydable ferritique, et bandes minces ainsi obtenues
US6374901B1 (en) 1998-07-10 2002-04-23 Ipsco Enterprises Inc. Differential quench method and apparatus
US7073565B2 (en) 1999-02-05 2006-07-11 Castrip, Llc Casting steel strip
AT411025B (de) * 2002-02-27 2003-09-25 Voest Alpine Ind Anlagen Vorrichtung zum kontinuierlichen vergiessen von metallschmelze
EP1452252A1 (en) * 2003-02-28 2004-09-01 Hubert Dipl.-Ing. Sommerhofer Continuous casting method
JP4580280B2 (ja) * 2005-05-31 2010-11-10 三菱日立製鉄機械株式会社 双ロール式連続鋳造機及び双ロール式連続鋳造方法
CN101265516B (zh) * 2008-04-23 2010-06-02 浙江佰耐钢带有限公司 一种钢带淬火工艺及所用的冷却介质
KR101203694B1 (ko) 2010-06-30 2012-11-21 주식회사 에스티 전기접점재료용 급냉 리본 제조방법 및 그 제조방법에 적용되는 급속응고장치
DE102013224851A1 (de) * 2013-12-04 2015-06-11 Schaeffler Technologies AG & Co. KG Kettenelement
JP6474965B2 (ja) * 2014-04-10 2019-02-27 権田金属工業株式会社 双ロール鋳造方法
CN112355259B (zh) * 2020-11-09 2022-04-19 中铝材料应用研究院有限公司 一种铝合金薄板液态连续凝固成型的制备装置及制备方法
CN113751680B (zh) * 2021-09-09 2022-05-06 中南大学 一种超细晶马氏体时效钢薄带的制造方法

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US3658117A (en) * 1970-05-07 1972-04-25 Fromson H A Continuous metal casting method and apparatus
JPS61293638A (ja) * 1985-06-20 1986-12-24 Mitsubishi Heavy Ind Ltd バルジング防止装置
JPS62112751A (ja) * 1985-11-09 1987-05-23 Nippon Steel Corp 鉄基形状記憶合金薄板・線の製造方法
EP0233147B1 (de) * 1986-02-13 1988-12-21 Larex Ag Walzgiessverfahren und Walzgiessanlage zur Durchführung desselben
JPS62197247A (ja) * 1986-02-21 1987-08-31 Nippon Yakin Kogyo Co Ltd 異方性が小さくかつ結晶粒が粗大化し難いオーステナイト系ステンレス鋼薄板帯の製造方法
US4723997A (en) * 1987-04-20 1988-02-09 L'air Liquide Method and apparatus for shielding a stream of liquid metal
JPH01299745A (ja) * 1988-05-25 1989-12-04 Ishikawajima Harima Heavy Ind Co Ltd 双ロール式連鋳機によるオーステナイト系ステンレスの鋳造方法
WO1990000454A1 (en) * 1988-07-08 1990-01-25 Nippon Steel Corporation PROCESS FOR PRODUCING THIN Cr-Ni STAINLESS STEEL SHEET EXCELLENT IN BOTH SURFACE QUALITY AND QUALITY OF MATERIAL

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1029617B2 (en) † 1999-02-05 2017-01-04 Castrip, LLC Continuous casting steel strip method

Also Published As

Publication number Publication date
AU644672B2 (en) 1993-12-16
CA2048769A1 (fr) 1992-02-14
FR2665652A1 (fr) 1992-02-14
NO179780B (no) 1996-09-09
ATE141066T1 (de) 1996-08-15
GR3020882T3 (en) 1996-11-30
US5201363A (en) 1993-04-13
FR2665652B1 (cs) 1994-12-30
ZA916292B (en) 1993-03-31
DE69121222T2 (de) 1997-03-20
IE912856A1 (en) 1992-02-26
FI913822L (fi) 1992-02-14
FI913822A0 (fi) 1991-08-12
EP0471608A1 (fr) 1992-02-19
JP2919125B2 (ja) 1999-07-12
NO179780C (no) 1996-12-18
AU8242991A (en) 1992-02-20
JPH0623491A (ja) 1994-02-01
FI95360C (fi) 1996-01-25
DK0471608T3 (da) 1996-12-23
NO913077D0 (no) 1991-08-08
PT98623A (pt) 1993-08-31
NO913077L (no) 1992-02-14
DE69121222D1 (de) 1996-09-12
TW198735B (cs) 1993-01-21
FI95360B (fi) 1995-10-13
ES2090274T3 (es) 1996-10-16

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