EP2016202A2 - Perfectionnement apporté aux sections de chauffage rapide des lignes de traitement thermique en continu. - Google Patents

Perfectionnement apporté aux sections de chauffage rapide des lignes de traitement thermique en continu.

Info

Publication number
EP2016202A2
EP2016202A2 EP07731385A EP07731385A EP2016202A2 EP 2016202 A2 EP2016202 A2 EP 2016202A2 EP 07731385 A EP07731385 A EP 07731385A EP 07731385 A EP07731385 A EP 07731385A EP 2016202 A2 EP2016202 A2 EP 2016202A2
Authority
EP
European Patent Office
Prior art keywords
heating
heating means
strip
temperature
band
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.)
Withdrawn
Application number
EP07731385A
Other languages
German (de)
English (en)
French (fr)
Inventor
Catherine Pasquinet
Frédéric MARMONIER
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.)
Fives Stein SA
Original Assignee
Fives Stein 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 Fives Stein SA filed Critical Fives Stein SA
Publication of EP2016202A2 publication Critical patent/EP2016202A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • C21D11/00—Process control or regulation for heat treatments
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire

Definitions

  • the present invention relates to improvements made to the heating sections of the continuous lines of heat treatment of metal strips. It is particularly intended to reduce the risk of thermal wrinkles forming on metal strips which are subjected to rapid heating in continuous heat treatment lines, in which said strips are passed through rapid heating zones provided with discontinuous heating means.
  • rapid heating is meant a heating which ensures a temperature rise of the band at a gradient of at least 100 ° C / second at the beginning of heating.
  • FIG. 1 of the accompanying drawings schematically shows an example of a heating section of a metal strip in a heat treatment line. .
  • the band 1 passes through the rapid heating section 2 by passing on an inlet roller 3 and an output roller 4.
  • the band 1 is exposed successively to four means 5, 5b, 5c, 5d, positioned on each side of the strip and distant in the direction of travel of the strip by a distance ⁇ , for example ⁇ ab between the heating means 5a and 5a, 5b, 5c, 5d. 5b.
  • the rapid heating causes a dilation of the material of the strip in directions parallel and perpendicular to the running direction of the strip. Expansion in the direction of travel of the web is compensated by the tape tensile control device which is provided with the heating section or the line in which this heating section is integrated.
  • FIG. 3 of the accompanying drawings shows the variation of these stresses during heating of the strip.
  • the curve T1 represents the temperature rise of the band, between Ta and Tb, during its passage in a heating means 5.
  • the curve C1 corresponds to the level of transverse stress in the band.
  • the horizontal line H passing through the point 0 of the stresses carried along the y-axis corresponds to a zero transverse stress.
  • a point of the curve C1 situated above the line H corresponds to a tensile stress, noted positive, while a point of the curve C1 situated below the line H corresponds to a compressive stress, denoted negative.
  • the first stress peak Ca corresponds to the point Ta of the curve T1 where the temperature increase begins. This is a tensile stress.
  • the second stress peak Cb corresponds to the point Tb of the curve T1 where the increase in temperature stops. This is a compression constraint.
  • the level of critical compressive stress beyond which a surface defect is generated is proportional to the mechanical strength of the web material. As the mechanical strength of the belt decreases as the temperature increases, and more and more rapidly as the temperature increases, the level of critical compressive stress is also reduced with temperature, thereby increasing the risk. as the temperature of the web increases.
  • the rapid heating sections of the continuous heat treatment lines of metal strips are dimensioned without taking into consideration the risk of fold formation. Therefore, for a given heating section, the operators in charge of the operation of the line must, in the absence of a known method, adapt by trial and error the setting of the oven until finding an operating point limiting these defaults. These settings lead to operation of the furnace not fully exploiting the available power which leads to a loss of production, for example when operators are led to reduce the speed of travel of the band.
  • the object of the invention is, above all, to provide a method which makes it possible to limit the formation of folds in the strip during rapid heating while keeping the nominal speed of the strip in passing through the rapid heating section, that is to say without loss of production.
  • the method of reducing the formation of folds on metal strips subjected to rapid heating in continuous heat treatment lines, wherein said strips are passed through heating sections comprising successive heating means and distinct is characterized in that the average slope of the temperature increase of the strip between the inlet and the outlet of a heating means decreases from one heating means to the next heating means.
  • the invention makes it possible to reduce the formation of folds on the strip in a strand placed between two drive rollers 3 and 4 according to FIGS. 1 and 2.
  • the folds that the invention makes it possible to reduce are generated by the thermal path of the tape, regardless of any contact of the tape with a baffle roll.
  • the ratio of the temperature difference of the strip, between the outlet and the inlet of a heating means, to the distance between the outlet and the inlet of this heating means decreases from a heating means to next heating means.
  • the instantaneous slope of the increase in temperature of the strip between the inlet and the outlet of a heating means, as a function of the distance traveled, is preferably greater at the inlet of the heating means than towards the outlet of this heating means.
  • the difference in heating intensity between two successive heating means can be progressively reduced to be low at high temperature so that the variation of the heating rate at all points of the strip is reduced as the temperature of the the band increases.
  • the intensity of heating between each heating means is gradually changed and the heating intensity between two successive heating means is reduced as the temperature of the band increases.
  • the band is injected with a larger heat flow when it is at low temperature, then gradually decreases the heat flow injected when the strip rises in temperature.
  • the heating may be provided to ensure a temperature rise of the strip in each heating means increasingly low from the first heating means where it is the most important.
  • the evolution of the flow exchanged between the strip and the heating means is progressive, that is to say that the variation of the heating slope is progressive.
  • the temperature rise gradient of the strip decreases by at least 15 ° C / second when passing from one heating section to the next.
  • Fig. 1 is a schematic vertical section of a rapid heating section of a heat treatment line of metal strips.
  • Fig. 2 is a diagram of FIG. 1 with, in correspondence, the heat flux injected by each heating means according to the state of the art.
  • Fig. 3 is a diagram illustrating the appearance of the stresses induced in a metal strip by a temperature variation.
  • Fig. 4 is a diagram illustrating several heating modes, including one according to the invention.
  • Fig. 5 is a diagram of FIG. 2 with, in correspondence, the heat flux injected by each heating means according to the invention.
  • Fig.6 is a diagram illustrating the stresses in a heated metal strip according to the method of the invention.
  • Fig.7 is a diagram illustrating the stresses in a heated metal strip according to a conventional method of the state of the art.
  • Fig.8 is a diagram illustrating the stresses in a heated metal strip according to the method of the invention.
  • Fig. 9 shows the diagram of FIG. 5, with the heat flux injected by each heating means according to the invention.
  • Fig. 10 shows, enlarged, the detail X of Fig.9.
  • Fig. 11 shows, enlarged, the detail Xl of Fig.9, and
  • Fig.12 is a diagram illustrating the stress variations and temperature variations in a heated metal strip according to the method of the invention.
  • FIG. 4 is a diagram on which is shown on the abscissa the length of the heating section equipped with four inductors traversed by a point of the metal strip, and the ordinate the temperature of the strip at this point. It can be seen that to achieve the same thermal objective corresponding to a temperature T at the end of the heating section, corresponding to the length L, it is possible to follow different thermal paths:
  • Path A corresponds to the same slope of temperature rise of the band in each heating means, .
  • the path B corresponds to a slope of temperature rise of the band in each degressive heating means from the first heating means where it is the most important,
  • the path C corresponds to a slope of temperature rise of the band in each heating means which increases progressively from the first heating means where it is the lowest.
  • Path D corresponds to a combination of paths B and C with a higher temperature rise slope of the band in the first and last heating means and lower for both central heating means.
  • the strip is heated in the heating section by following the thermal path B of temperature rise.
  • this thermal path is obtained by injecting a heat flow ⁇ a important to the band at the beginning of the heating, when this is at a lower temperature, then gradually limiting the injected flow ⁇ b, ⁇ c, ⁇ d as and as the temperature of the band increases.
  • the temperature rise gradient of the strip in the first heating section that is to say in the first heating means 5a, is greater than
  • the thermal path according to the invention makes it possible to limit the slope variation of the temperature curve at the outlet of each heating element as the strip rises in temperature. Compression stresses perpendicular to the axis of the strip, likely to generate folds, are thus increasingly weak at each successive output of the rapid heating zones: C2a>C2b>C2c> C2d.
  • the heating provided by the successive heating means 5a, 5b, 5c, 5d is such that the average curve representing the rise in temperature of the strip as a function of the length of the heating section has a concavity turned towards the axis of coordinates on which is the length.
  • mean curve is meant a curve passing through the midpoints of the horizontal straight segments of the actual temperature rise curve in Figure 6.
  • the average slope of the temperature increase of the strip between the inlet and the outlet of heating means decreases from one heating means to the next heating means.
  • the invention is also characterized by a method which consists in progressively modifying the intensity of the heating in each heating means 5 so that the evolution of the flow exchanged with the strip is progressive. that is, the change in the rate of change of the function (temperature / time) corresponding to a change in the heating slope is progressive.
  • FIG. 9 the flow variation between the strip and the heating means 5 is progressive according to the invention from the inlet to the outlet of each heating means while rapid heating according to the invention.
  • state of the art would lead to the flux curve P, shown in fine lines in Fig. 10 and 11, with abrupt changes in flux variation.
  • This gradual variation of the flow according to the invention is imaged in FIG. 9 by a rounded flow curve during changes in slope between rise in temperature, upper plateau, then descent and lower plateau, whereas these changes are at sharp angles on the curve P according to the state of the art.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Control Of Heat Treatment Processes (AREA)
EP07731385A 2006-05-02 2007-04-27 Perfectionnement apporté aux sections de chauffage rapide des lignes de traitement thermique en continu. Withdrawn EP2016202A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0603899A FR2900661B1 (fr) 2006-05-02 2006-05-02 Perfectionnement apporte aux sections de chauffage rapide des lignes de traitement thermique en continu.
PCT/FR2007/000733 WO2007125213A2 (fr) 2006-05-02 2007-04-27 Perfectionnement apporte aux sections de chauffage rapide des lignes de traitement thermique en continu

Publications (1)

Publication Number Publication Date
EP2016202A2 true EP2016202A2 (fr) 2009-01-21

Family

ID=37614028

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07731385A Withdrawn EP2016202A2 (fr) 2006-05-02 2007-04-27 Perfectionnement apporté aux sections de chauffage rapide des lignes de traitement thermique en continu.

Country Status (13)

Country Link
US (1) US8425225B2 (es)
EP (1) EP2016202A2 (es)
JP (1) JP2009535512A (es)
KR (1) KR101370949B1 (es)
CN (1) CN101432451B (es)
AU (1) AU2007245554A1 (es)
BR (1) BRPI0711034A2 (es)
CA (1) CA2650187A1 (es)
EA (1) EA014407B1 (es)
FR (1) FR2900661B1 (es)
MX (1) MX2008013858A (es)
WO (1) WO2007125213A2 (es)
ZA (1) ZA200808818B (es)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102686965B (zh) * 2009-12-15 2016-02-17 西门子奥钢联冶金技术有限公司 用于对连续运动的钢带进行预热的装置和方法
US9362546B1 (en) 2013-01-07 2016-06-07 Quantumscape Corporation Thin film lithium conducting powder material deposition from flux
CN105683127B (zh) 2013-10-07 2020-08-28 昆腾斯科普公司 用于锂二次电池的石榴石材料和制造和使用石榴石材料的方法
FR3014447B1 (fr) * 2013-12-05 2016-02-05 Fives Stein Procede et installation de traitement thermique en continu d'une bande d'acier
CN114163219A (zh) 2015-04-16 2022-03-11 昆腾斯科普电池公司 用于固体电解质制作的承烧板和用其制备致密固体电解质的方法
US9966630B2 (en) 2016-01-27 2018-05-08 Quantumscape Corporation Annealed garnet electrolyte separators
US11993823B2 (en) 2016-05-10 2024-05-28 United States Steel Corporation High strength annealed steel products and annealing processes for making the same
JP7186694B2 (ja) 2016-05-10 2022-12-09 ユナイテッド ステイツ スチール コーポレイション 高強度鋼製品及び該製品を製造するためのアニーリング工程
US11560606B2 (en) 2016-05-10 2023-01-24 United States Steel Corporation Methods of producing continuously cast hot rolled high strength steel sheet products
EP3529839A1 (en) 2016-10-21 2019-08-28 QuantumScape Corporation Lithium-stuffed garnet electrolytes with a reduced surface defect density and methods of making and using the same
EP3642899B1 (en) 2017-06-23 2024-02-21 QuantumScape Battery, Inc. Lithium-stuffed garnet electrolytes with secondary phase inclusions
US11600850B2 (en) 2017-11-06 2023-03-07 Quantumscape Battery, Inc. Lithium-stuffed garnet thin films and pellets having an oxyfluorinated and/or fluorinated surface and methods of making and using the thin films and pellets
RU2751857C1 (ru) * 2018-02-22 2021-07-19 ДжФЕ СТИЛ КОРПОРЕЙШН Способ нагрева стального листа во время непрерывного отжига и установка непрерывного отжига
KR20220004213A (ko) 2019-05-07 2022-01-11 유나이테드 스테이츠 스틸 코포레이션 연속 주조 열간 압연 고강도 강판 제품의 제조 방법
BR112022001335A2 (pt) 2019-08-07 2022-03-22 United States Steel Corp Produto de chapa de aço de têmpera e separação, e, método para produzir produto de chapa de aço de têmpera e separação
WO2021034851A1 (en) 2019-08-19 2021-02-25 United States Steel Corporation High strength steel products and annealing processes for making the same

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5924166B2 (ja) * 1977-10-20 1984-06-07 新日本製鐵株式会社 ストリツプの連続加熱に於ける板温制御方法
JPS6016499B2 (ja) * 1978-08-06 1985-04-25 住友軽金属工業株式会社 金属ストリツプの熱処理方法
JPS6056218B2 (ja) * 1980-01-18 1985-12-09 大同特殊鋼株式会社 金属ストリツプの熱処理方法
JPS6056026A (ja) * 1983-09-08 1985-04-01 Mitsubishi Heavy Ind Ltd 連続焼鈍設備加熱炉の炉温設定方法
JPH01215930A (ja) * 1988-02-24 1989-08-29 Kobe Steel Ltd 薄鋼板の連続焼鈍方法
JPH04285130A (ja) * 1991-03-12 1992-10-09 Nippon Steel Corp 連続焼鈍設備の加熱炉における燃焼ガス流量制御方法
JPH06212283A (ja) * 1993-01-19 1994-08-02 Mitsubishi Heavy Ind Ltd ステンレス鋼板の焼鈍方法
JPH093552A (ja) * 1995-06-23 1997-01-07 Nippon Steel Corp 溶融亜鉛めっき鋼板を効率的に製造する連続溶融亜鉛めっき設備
FR2746112B1 (fr) * 1996-03-13 1998-06-05 Procede de traitement thermique en continu de bandes metalliques dans des atmospheres de nature differente
JP2003517100A (ja) * 1999-12-17 2003-05-20 アルキャン・インターナショナル・リミテッド 最小の歪みでもって合金板を急冷する方法
FR2802552B1 (fr) * 1999-12-17 2002-03-29 Stein Heurtey Procede et dispositif de reduction des plis de bande dans une zone de refroidissement rapide de ligne de traitement thermique
US20020017344A1 (en) * 1999-12-17 2002-02-14 Gupta Alok Kumar Method of quenching alloy sheet to minimize distortion
FR2820148B1 (fr) * 2001-01-31 2003-10-31 Stein Heurtey Perfectionnements apportes aux procedes de chauffage de bandes d'acier dans des fours verticaux
JP2003253343A (ja) * 2002-03-05 2003-09-10 Jfe Steel Kk 金属帯の連続熱処理方法
DE10337502B4 (de) * 2003-08-14 2006-03-30 Kramer, Carl, Prof. Dr.-Ing. Verfahren zum Betrieb einer Durchlauf-Wärmebehandlungsanlage für Warenbahnen und Bänder mit überwiegend konvektiver Wärmeübertragung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007125213A2 *

Also Published As

Publication number Publication date
EA014407B1 (ru) 2010-12-30
WO2007125213A3 (fr) 2008-01-03
CA2650187A1 (fr) 2007-11-08
ZA200808818B (en) 2009-11-25
KR20090007737A (ko) 2009-01-20
FR2900661B1 (fr) 2008-09-26
FR2900661A1 (fr) 2007-11-09
AU2007245554A1 (en) 2007-11-08
BRPI0711034A2 (pt) 2012-03-06
CN101432451A (zh) 2009-05-13
KR101370949B1 (ko) 2014-03-14
US20100062385A1 (en) 2010-03-11
US8425225B2 (en) 2013-04-23
CN101432451B (zh) 2011-06-15
WO2007125213A2 (fr) 2007-11-08
MX2008013858A (es) 2009-01-26
EA200870493A1 (ru) 2009-02-27
JP2009535512A (ja) 2009-10-01

Similar Documents

Publication Publication Date Title
EP2016202A2 (fr) Perfectionnement apporté aux sections de chauffage rapide des lignes de traitement thermique en continu.
FR2752904A1 (fr) Procede de fabrication d'une conduite flexible
FR2532869A1 (fr) Procede de revetement en continu d'une bande d'aluminium
EP0707941B1 (fr) Procédé et machine pour l'élaboration de tubes en matériau composite à caractéristiques mécaniques et tribologiques élevées, et tubes obtenus par ledit procédé
EP0434536B1 (fr) Matelas thermo-isolant en fibres minérales à orientation aléatoire
EP3077562A1 (fr) Ligne de traitement en continu d'une bande metallique amagnetique comprenant une section de galvannealing et procede de chauffage par induction de ladite bande dans ladite section de galvannealing
FR2599996A1 (fr) Procede et appareil pour la production en continu de tubes metalliques soudes
EP1711441B1 (fr) Fabrication de verre plat par flottage sans point fixe
BE1004964A6 (fr) Procede de controle d'une soudure bout a bout de bandes metalliques.
CH643442A5 (fr) Filtre et procede de production de filtres.
FR2539550A1 (fr) Procede de fabrication de supraconducteurs stabilises par de l'aluminium, et supraconducteur ainsi produit
EP1457580A1 (fr) Procédé d'oxydation controlée de bandes avant galvanisation en continu et ligne de galvanisation
FR2599995A1 (fr) Procede pour la realisation en continu de tubes metalliques soudes
EP1647604B1 (fr) Procedé et dispositif d'amélioration qualitative et quantitative de la production dans un four vertical de traitement de bandes d'acier ou d'aluminium
FR2893531A1 (fr) Procede de consolidation en continu pour l'obtention d'un materiau stratifie et dispositif pour sa mise en oeuvre
FR2490983A1 (fr) Procede de soudage en bout par etincelage et produits soudes obtenus par ledit procede
FR2924975A1 (fr) Dispositif d'etirage longitudinal de films en matiere synthetique
EP2041325A1 (fr) Installation de traitement thermique en continu, destiné au recuit brillant d'une bande d'acier inoxydable
FR3017628A1 (fr) Fil textile, notamment pour la realisation d'un revetement de siege, par exemple par tissage ou tricotage, en particulier pour un vehicule ferroviaire
FR2506635A1 (fr) Procede et dispositif d'amelioration de la planeite de toles minces
WO1991008320A1 (fr) Procede de revetement d'une plaque ou tole metallique dont au moins une face possede un double revetement mineral-plaque ou bande issue du procede
BE567151A (es)
CA2704743A1 (fr) Culasse feuilletee refendue en peigne pour inducteur a champ magnetique traversant de rechauffage de bandes metalliques
BE824713A (fr) Procede et appareil pour etirer des fils textiles synthetiques
WO2010092284A1 (fr) Fabrication de verre plat texture au flottage

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20081104

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR MK RS

DAX Request for extension of the european patent (deleted)
17Q First examination report despatched

Effective date: 20110621

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20131101