EP0970256B1 - Laminage a chaud de feuillard d'acier - Google Patents

Laminage a chaud de feuillard d'acier Download PDF

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Publication number
EP0970256B1
EP0970256B1 EP98912456A EP98912456A EP0970256B1 EP 0970256 B1 EP0970256 B1 EP 0970256B1 EP 98912456 A EP98912456 A EP 98912456A EP 98912456 A EP98912456 A EP 98912456A EP 0970256 B1 EP0970256 B1 EP 0970256B1
Authority
EP
European Patent Office
Prior art keywords
temperature
ferrite
hot
process according
rolled
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
EP98912456A
Other languages
German (de)
English (en)
Other versions
EP0970256A1 (fr
Inventor
Hans Pircher
Manfred Espenhahn
Rudolf Kawalla
Waldemar Wolpert
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.)
ThyssenKrupp Steel Europe AG
Original Assignee
ThyssenKrupp Stahl 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
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Application filed by ThyssenKrupp Stahl AG filed Critical ThyssenKrupp Stahl AG
Publication of EP0970256A1 publication Critical patent/EP0970256A1/fr
Application granted granted Critical
Publication of EP0970256B1 publication Critical patent/EP0970256B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
    • 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
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • 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
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0231—Warm rolling
    • 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
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236—Cold rolling
    • 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
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0273—Final recrystallisation annealing
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2201/00—Special rolling modes
    • B21B2201/02—Austenitic rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2201/00—Special rolling modes
    • B21B2201/04—Ferritic rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2201/00—Special rolling modes
    • B21B2201/16—Two-phase or mixed-phase rolling
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/001—Austenite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite

Definitions

  • the invention relates to a method for producing continuously cast and / or pre-rolled strips in the austenite area with homogeneous structures and properties from unalloyed and low-alloy steel by continuous hot rolling in two or more passes in the austenite area, starting from a temperature T Ar Ar 3 + 30 ° C , with a total degree of deformation e h ⁇ 30% and then in several passes in the ferrite area with a total degree of deformation e h ⁇ 60% and reels.
  • the invention is based on the object on space and time-consuming and costly additional installations by reinforcing the cooling section and largely to be dispensed with between the finishing stands.
  • the method according to the invention can be used advantageously Steels with (in mass%) max. 0.06% C, max. 1.5% Si, Max. 0.6% Mn, 0.005 to 0.25% P, max. 0.03% S, max. 0.008% N and possibly up to a total of 1.5% of one or more of the elements Al, Ti, Nb, Zr, Cu, Sn, Balance iron, including inevitable Carry out impurities.
  • the continuous rolling provided in the invention Austenite, in the two-phase and in the ferrite area can both used in one for conventional austenite rolling multi-stand finished series as well as in finished series of hot strip mills, the thin slabs directly from the Process pouring heat, apply.
  • the temperature setting in the rolling stock is carried out precisely and precisely through the variable and step-by-step use of cooling groups, which are available, for example, in the scale washer before entering the finishing line and behind the finishing stands.
  • the hot strip is preferably regulated by means of high-pressure water to an inlet temperature in the range of T ⁇ Ar 3 + 30 ° C.
  • the new process is widely variable.
  • By cooling in the course of the Finishing rolling is the austenite / ferrite conversion kinetics accelerated and the two-phase area in terms of temperature advantageously concentrated.
  • the rolling temperatures can also be set accurately and very precisely, taking into account the Ar 3 temperature and in particular the Ar 1 temperature.
  • This enables ferrite rolling slightly above Ar 1 as well as below Ar 1 .
  • Ferrite rolling near Ar 1 offers the possibility of saving rolling forces and thus driving high pass reductions, which are necessary, for example, for thin strips below 2.5 mm and even below 1 mm final thickness.
  • the low rolling forces are advantageously used to produce strips of large widths.
  • a soft hot strip i.e. to a hot strip with a largely softened structural condition.
  • a reel is advantageously at a short distance of, for example, 20 m to the outlet of the last one Completed scaffolding used.
  • This hot strip shows Characteristics on the direct use of hot strip as a material.
  • Hot strip at a temperature in the range between Conversion end temperature of the ferrite and up to 200 ° C below, preferably less than 100 ° C below, finish rolled and then at a temperature ⁇ 650 ° C coiled.
  • the hot strip can be brought to a reel temperature at a core cooling rate of over 10 K / s at the latest 2 s after the end of the rolling with liquid and / or gaseous cooling media, such as water and / or water-air mixture be cooled, which is more than 200 ° C below the Ar 1 temperature.
  • liquid and / or gaseous cooling media such as water and / or water-air mixture be cooled
  • Thin strips below 3 mm final thickness should preferably be below Use of lubricants rolled in the ferrite area become.

Claims (10)

  1. Procédé de fabrication d'un feuillard laminé à chaud à partir de matières à laminer coulées en continu et/ou dégrossies dans le domaine austénitique, ayant une structure et des propriétés homogènes, constitué d'acier non allié ou peu allié, dans lequel les matières à laminer sont laminées à chaud puis bobinées en continu dans un groupe finisseur avec laminoir, en deux ou plusieurs passes, dans le domaine austénitique, en partant d'une température T ≥ Ar3 + 30 °C, avec un coefficient total de corroyage eh ≥ 30 %, et ensuite en plusieurs passes dans le domaine ferritique avec un coefficient total de corroyage eh ≥ 60 %, caractérisé en ce que les matières à laminer sont laminées à chaud en continu dans le groupe finisseur, successivement dans le domaine austénitique, dans le domaine biphasé, et dans le domaine ferritique; en ce que les matières à laminer sont refroidies de façon intense après chaque passe, au cours du laminage à chaud, grâce à l'utilisation rationnelle de groupes réfrigérants placés dans le groupe finisseur; et en ce que le refroidissement intensif est arrêté après la fin de la transformation en ferrite.
  2. Procédé selon la revendication 1, caractérisé en ce que le refroidissement intensif est effectué après chaque passe jusqu'à la fin de la transformation en ferrite, par injection d'eau, ou d'un mélange eau - air, ou d'un mélange eau - vapeur sous une pression ≥ 3 bar.
  3. Procédé selon la revendication 1 ou la revendication 2, caractérisé en ce que les feuillards sont laminés à chaud à partir d'un acier contenant (en % massique) au maximum 0,06 % de C, au maximum 1,5 % de Si, au maximum 0,6 % de Mn, 0,005 à 0,25 % de P, au maximum 0,03 % de S, au maximum 0,008 % de N, ainsi qu'éventuellement jusqu'à un total de 1,5 % d'un ou de plusieurs des éléments Al, Ti, Nb, Zr, Cu, Sn, le reste étant du fer y compris les impuretés résiduelles.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce qu'on termine le laminage du feuillard laminé à chaud à une température située dans l'intervalle allant de la température finale de la transformation en ferrite à 200°C en dessous dans le domaine ferritique, et qu'on le bobine ensuite à une température ≥ 650 °C.
  5. Procédé selon la revendication 4, caractérisé en ce qu'on termine le laminage à une température située dans l'intervalle allant de la température finale de la transformation en ferrite à 100 °C en dessous dans le domaine ferritique.
  6. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que le feuillard laminé à chaud est refroidi, au plus tard 2 s après la fin du laminage, avec des fluides caloporteurs sous une forme liquide et/ou gazeuse, tels que de l'eau et/ou un mélange eau - air, à une vitesse de refroidissement à coeur supérieure à 10 K/s, jusqu'à une température de bobinage qui se situe plus de 200 °C en dessous de la température Ar1.
  7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce que le feuillard laminé à chaud est laminé à froid selon un degré d'amincissement ≥ 30 %.
  8. Procédé selon la revendication 7, caractérisé en ce que le feuillard laminé à chaud est laminé à froid selon un degré d'amincissement ≥ 60 %.
  9. Procédé selon l'une des revendications 4 à 7, caractérisé en ce que le feuillard laminé à chaud ou à froid est recuit avec recristallisation et/ou soumis à un traitement améliorant sa surface au cours d'une passe ou dans un dôme.
  10. Procédé selon l'une des revendications 1 à 9, caractérisé en ce qu'on termine le laminage du feuillard d'acier dans le domaine ferritique, avec ajout d'un lubrifiant, à une épaisseur inférieure à 3 mm.
EP98912456A 1997-03-26 1998-03-07 Laminage a chaud de feuillard d'acier Expired - Lifetime EP0970256B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19712616 1997-03-26
DE19712616A DE19712616C2 (de) 1997-03-26 1997-03-26 Warmwalzen von Stahlband
PCT/EP1998/001338 WO1998042881A1 (fr) 1997-03-26 1998-03-07 Laminage a chaud de feuillard d'acier

Publications (2)

Publication Number Publication Date
EP0970256A1 EP0970256A1 (fr) 2000-01-12
EP0970256B1 true EP0970256B1 (fr) 2001-02-07

Family

ID=7824623

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98912456A Expired - Lifetime EP0970256B1 (fr) 1997-03-26 1998-03-07 Laminage a chaud de feuillard d'acier

Country Status (11)

Country Link
US (1) US6284069B1 (fr)
EP (1) EP0970256B1 (fr)
JP (1) JP2001520707A (fr)
KR (1) KR100506541B1 (fr)
AT (1) ATE199101T1 (fr)
AU (1) AU728353B2 (fr)
CA (1) CA2284635A1 (fr)
DE (2) DE19712616C2 (fr)
ES (1) ES2155285T3 (fr)
GR (1) GR3035532T3 (fr)
WO (1) WO1998042881A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT509707B1 (de) * 2010-05-04 2011-11-15 Siemens Vai Metals Tech Gmbh Verfahren zum warmwalzen von stahlbändern und warmwalzstrasse
DE102016114579B4 (de) 2016-08-05 2021-12-09 Technische Universität Dresden Harvesterkopf für die Holzernte und Messeranordnung

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE807881R (fr) * 1973-11-27 1974-05-27 Centre Rech Metallurgique Procede pour la fabrication de toles pour emboutissage
DD160457A1 (de) * 1981-06-11 1983-08-03 Florin Stahl Walzwerk Verfahren zur thermomechanischen behandlung von walzstahl
DE3437637A1 (de) * 1984-10-13 1986-04-24 Thyssen Stahl AG, 4100 Duisburg Verfahren zur herstellung von grobblech
NL8702050A (nl) * 1987-09-01 1989-04-03 Hoogovens Groep Bv Werkwijze en inrichting voor de vervaardiging van bandvormig vervormingsstaal met goede mechanische en oppervlakte-eigenschappen.
NL8802892A (nl) * 1988-11-24 1990-06-18 Hoogovens Groep Bv Werkwijze voor het vervaardigen van vervormingsstaal en band vervaardigd daarmee.
IT1244295B (it) * 1990-07-09 1994-07-08 Giovanni Arvedi Processo ed impianto per l'ottenimento di nastri di acciaio avvolti, aventi caratteristiche di laminati a freddo ottenuti direttamente in linea di laminazione a caldo
NL9100911A (nl) * 1991-03-22 1992-10-16 Hoogovens Groep Bv Inrichting en werkwijze voor het vervaardigen van warmgewalst staal.
DE19520832A1 (de) * 1994-10-20 1996-04-25 Mannesmann Ag Verfahren und Vorrichtung zur Herstellung von Stahlband mit Kaltwalzeigenschaften
EP0804300B1 (fr) * 1994-10-20 1999-05-06 MANNESMANN Aktiengesellschaft Procede et dispositif de production d'une feuille d'acier presentant les proprietes d'un produit lamine a froid
DE19600990C2 (de) * 1996-01-14 1997-12-18 Thyssen Stahl Ag Verfahren zum Warmwalzen von Stahlbändern

Also Published As

Publication number Publication date
KR100506541B1 (ko) 2005-08-08
ES2155285T3 (es) 2001-05-01
AU728353B2 (en) 2001-01-04
CA2284635A1 (fr) 1998-10-01
WO1998042881A1 (fr) 1998-10-01
GR3035532T3 (en) 2001-06-29
US6284069B1 (en) 2001-09-04
EP0970256A1 (fr) 2000-01-12
ATE199101T1 (de) 2001-02-15
DE19712616C2 (de) 1999-07-15
DE19712616A1 (de) 1998-10-01
AU6728698A (en) 1998-10-20
KR20010005742A (ko) 2001-01-15
JP2001520707A (ja) 2001-10-30
DE59800464D1 (de) 2001-03-15

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