EP3512969A1 - Installation de traitement à chaud, flexible, pour une bande métallique dans une construction horizontale - Google Patents

Installation de traitement à chaud, flexible, pour une bande métallique dans une construction horizontale

Info

Publication number
EP3512969A1
EP3512969A1 EP17781402.7A EP17781402A EP3512969A1 EP 3512969 A1 EP3512969 A1 EP 3512969A1 EP 17781402 A EP17781402 A EP 17781402A EP 3512969 A1 EP3512969 A1 EP 3512969A1
Authority
EP
European Patent Office
Prior art keywords
treatment
heat treatment
strip
post
steel
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.)
Pending
Application number
EP17781402.7A
Other languages
German (de)
English (en)
Inventor
Bernhard Engl
Andreas Köppe
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.)
SMS Group GmbH
Original Assignee
SMS Group GmbH
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 SMS Group GmbH filed Critical SMS Group GmbH
Publication of EP3512969A1 publication Critical patent/EP3512969A1/fr
Pending 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
    • 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
    • C21D9/562—Details
    • C21D9/563—Rolls; Drums; Roll arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C49/00—Devices for temporarily accumulating material
    • 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
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • 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
    • C21D9/573—Continuous furnaces for strip or wire with cooling
    • C21D9/5735—Details
    • C21D9/5737—Rolls; Drums; Roll arrangements

Definitions

  • the present invention relates to a treatment part in a continuous annealing or hot-dip galvanizing plant for strip, which is suitable for carrying out a
  • Heat post-treatment process after annealing and cooling is determined.
  • the strip In the heat post-treatment plant, the strip is treated at different, predetermined temperatures and times.
  • the tape is guided in loops so that it is deflected to roles that are stored in an outlet-side stationary arrangement and an inlet-side arrangement on at least one loop carriage, wherein the horizontal distance between the two arrangements by methods of / the
  • Continuous annealing is a thermal treatment applied to steel strips after cold rolling. It is described in detail in the known literature (eg DE 21 59 597, DE 24 01 381, ASM Handbook / Vol. 4 Heat Treating / ASM Int., 1991, Umformtechnik Plastomechanik und Werkstoff ambience / Verlag Stahleisen Springer Verlag / 1993).
  • the continuous annealing process consists of passing the steel strip through an oven where it is subjected to controlled heating and cooling.
  • the belt runs in the form of successive vertical loops, also called loops, and passes through various treatment steps.
  • the strip is subjected to an annealing process for recrystallization consisting of preheating, heating and holding at maximum temperature.
  • a cooling process usually divided into a slow and a subsequent rapid cooling, performed. This is followed by a heat treatment in the form of a
  • continuous annealing plants behind the annealing part and a cooling stage contain an aging furnace (also referred to as overaging, annealing or tempering) in which the proportion of dissolved carbon is to be reduced to low values.
  • an aging furnace also referred to as overaging, annealing or tempering
  • aging can also be associated with falling temperature, e.g. to 350 ° C or 300 ° C, are performed.
  • Atmosphere heated and held to perform a recrystallization. Thereafter, the steel strip is cooled in a gas cooler, immersed in the zinc bath and, if necessary, subjected to an alloying treatment to then obtain the final galvanized sheet product after further cooling and final temper rolling.
  • tape storage used to maintain a continuous process speed.
  • Specific operations requiring such a plant technique include, for example, changing coils and then welding the beginning of the strip of the new coil to the strip end of the preceding coil.
  • Another example is the roll change in the skin pass mill.
  • the tape storage have the task of producing and providing large tape lengths.
  • vertical tape storage which are also known as loop tower, Schiingenturm or Looper used.
  • tape storage are those of horizontal type (e.g., DE 2144515) which use looping carts.
  • the loop carts are arranged horizontally movable. They can be driven by means of a cable pull and a winch drum (DE 10 201 1 01 1 666, whereby synchronous driving of all loop carriages is ensured, see DE 3636652.
  • the strip In order to avoid an excessive sagging of the steel strip, the strip must be supported Swing gates (DE 19838780) or support car (EP 0773074) used.
  • Bander maybermungsöfen are designed as vertical ovens or as horizontal ovens.
  • the rollers used for tape guide are permanently installed in their position, ie not movable, such as in a tape storage described above. Used steel grades
  • Steel plates made of deep-drawing steels produced in the hot-dip galvanizing process must have excellent formability and should as far as possible show no deformation aging.
  • Deformation aging is caused by carbon and nitrogen in solid solution and causes surface defects in the form of so-called "flow patterns" and leads to deterioration of the mechanical properties over time
  • the first method uses elements for strongly bonding carbon and nitrogen, such as titanium and / or niobium, and enables the production of galvanized steel sheet having excellent formability and free from
  • Another method uses less expensive, low carbon AI killed steel as the starting material. In a conventional continuous galvanizing plant, the steel sheets of this material contain a considerable amount of solid solution carbon which causes strain aging. Remedy can
  • a two-phase structure consisting of ferrite and martensite is typical of the microstructure of dual-phase steel.
  • the TRIP steels make use of the transformation induced plasticity caused by transformation of retained austenite to martensite during forming.
  • High-strength steels in particular the AHHS steels, are used both in the
  • Hot dip galvanizing process as well as produced by continuous annealing In the manufacture of TRIP steels, a holding process is performed after annealing and gas cooling. According to EP 2 738 276, such a holding operation is carried out by holding the steel sheet after cooling at a temperature between 500 and 350 ° C for 30 to 1000 seconds. One occurs
  • Bainite transformation on and the retained austenite is stabilized. If the temperature is kept below 350 ° C, the bainite transformation takes a long time.
  • TRIP steel are according to the prevailing knowledge holding times for the bainitician
  • Treatment process for the production of higher-strength steels with relatively good formability such as TRIP and dual-phase steels.
  • a traditional hot dip galvanizing line is not the best option to produce AI-tempered deep-drawing steels and TRIP steels because it does not normally contain a post heat treatment zone and therefore does not allow a hold phase. More suitable is a galvanizing plant with a heat post-treatment zone for
  • insufficient holding times in a hot-dip galvanizing line is to use a number of multiple ribbon blanks, optionally with additional reduced ribbon speed, after annealing and cooling in a post-heat treatment zone.
  • Galvanizing plant required. Since the rollers are arranged rigidly in a conventional heat treatment unit, the time for running through this system is fixed at a given belt speed. There is no way to shorten the turnaround time. Such an inflexible heat treatment unit has a serious disadvantage. It significantly worsens the conditions for optimum production of IF and dual-phase steels in terms of their properties and cost-effectiveness.
  • a dual-phase steel requires the shortest possible cycle times at the lowest possible temperatures in an existing post-treatment zone or
  • Overaging zone e.g. to DE 199 36 151.
  • 150 seconds means a reduction in the mean
  • Cooling rate of at least 20 ° C / s to ensure the required transformation of retained austenite into martensite.
  • undesirable tempering effects in martensite may occur after further passage through the overaging zone.
  • post heat treatment is not required at all, and the passage of such steels in a post heat treatment zone without the possibility of reducing the holding time means unnecessary
  • the aim of the invention is the continuous annealing or hot-dip galvanizing of strip after annealing and cooling in a heat post-treatment unit
  • Treatment times and treatment temperatures in a wide range targeted change are intended in particular to enable the
  • Treatment times in the post-heat treatment to the requirements of each treated steel type are optimally adapted.
  • the present invention relates to a device in a heat treatment chamber for performing a heat post-treatment operation after annealing and cooling in a belt-passing plant, see Figure 1.
  • a device in a heat treatment chamber for performing a heat post-treatment operation after annealing and cooling in a belt-passing plant see Figure 1.
  • Heat treatment plant referred to, in which the invention is used.
  • a number of vertically arranged heat treatment chamber (1) In the heat treatment chamber (1), a number of vertically arranged
  • Treatment part gives. At the exit the band is led out of the treatment area.
  • the arrangement of the front loop carriage (3) is structurally designed so that it can be moved horizontally forward or backward.
  • a metal band can be guided in loops through the treatment chamber, wherein by treating the front arrangement of loop carriage forward or rear different treatment or
  • the device can also be designed so that only a part of the front loop carriage on a horizontally movable
  • Belt speed may be increased to optimal values to further reduce the hold time.
  • the strip is heated by heaters at different, predetermined temperatures less than the annealing temperature, z. At 800 ° C. preferably heat treated at 350 to 500 ° C.
  • Deep-drawing steel is too high, because then too high levels of dissolved carbon must be expected after completion of the overaging treatment with a correspondingly high residual carbon content and high aging susceptibility.
  • temperatures for the overaging treatment are too low, e.g. below 300 ° C, then it is to be expected that no further dissolved carbon content separates out and / or the precipitates are too fine with the result of a
  • a temperature range between 300 and 500 ° C is to be selected. If the temperatures are higher or lower, the conversion of retained austenite does not lead to bainite and thus not to the
  • Heat aftertreatment plant offer the various methods familiar to the expert.
  • the heating takes place by means of an electrical
  • Resistance heating or inductive heating are used.
  • the heating can also be carried out with a heat transfer heating gas in the circulation operation with an external heating.
  • the heat transfer heating gas used is preferably a mixture of nitrogen and hydrogen, which is also used as protective gas.
  • the furnace walls mounted electrical heating elements can help to increase the heating power.
  • the process can also be designed so that in the treatment chamber according to the invention immediately after the arrival of the tape, first cooling to minimum RT, preferably 350 to 500 ° C, e.g. in a gas stream is carried out, and then the band for the purpose of heat treatment to a higher temperature, preferably max. 500 ° C, reheated and held there for a while.
  • first cooling to minimum RT preferably 350 to 500 ° C, e.g. in a gas stream is carried out
  • the band for the purpose of heat treatment to a higher temperature, preferably max. 500 ° C, reheated and held there for a while.
  • Another Merkmai is that the treatment chamber is made gas-tight and that the dew point of the annealing gas can be variably selected in one
  • Table 1 shows typical prior art plant data which were used in the examples in Table 2, unless the
  • a sling consists of two passports.
  • the pass length was chosen to be 25 m (CGL) or 30 m (CAL) for the present case, but could be longer or shorter.
  • example S 1 shows the results in the event that no
  • the example E 1 c which is also part of the invention, shows the results for the case in which no specific additional treatment is carried out by moving the front loop carriage to the front position, see Figure 3. This results in a short cycle time of 12 seconds (see FIG. Table 2). Even with the new concept with the shortened cycle time, the belt speed can be increased if necessary for the purpose of increasing performance.
  • Examples S 2 a and E 2 b refer to treatments in one
  • the non-invention example S 2 a shows the results in the case where in a conventional system, a prior art over-aging furnace with rigid vertical roller assembly was installed.
  • the long lead time of approx. 135 seconds at a temperature of 400 ° C is known to contribute significantly to the improvement of the mechanical properties of thermoforming steel (see, for example, Umformtechnik Plastomechanik und Werkstoff ambience / Verlag Stahleisen Springer Verlag / 1993) and TRIP steel (see for example WO2012 / 53016).
  • This condition is also achieved when according to the invention the front arrangement of looping carriage is moved as in Figure 2 in the front position.
  • such long lead times lead to a corresponding deterioration of the manufacturing conditions for IF steel and
  • the example E 2 b belonging to the invention shows the results in the case where a horizontally movable system for the front rollers is used for passing through the belt through the overaging furnace, and the front rollers are moved to the front position, s. Figure 3. In this way, no specific additional treatment is carried out. This results in a short cycle time (see Table 2).
  • Belt speed can be increased if necessary for an increase in performance. This can be used with IF steels and dual-phase steels, as they do not require any additional treatment to improve the properties, as mentioned.
  • Heat treatment zone with horizontal design the treatment times can be selectively changed in a wide range. This will make it possible for the

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Coating With Molten Metal (AREA)

Abstract

Lors du recuit continu et de la galvanisation à chaud, les aciers emboutis calmés par Al et les aciers TRIP sont posttraités en ligne à chaud à des temps de traitement relativement longs pour obtenir les meilleures propriétés possibles. Un inconvénient sérieux en découle, car les conditions pour une production optimale d'aciers IF et double phase sont dégradées en ce qui concerne leurs propriétés et leur rentabilité économique. L'invention concerne l'adaptation ciblée des temps de traitement aux exigences de chaque type d'acier traité dans une unité horizontale de posttraitement thermique. La solution porte sur un dispositif dans une chambre (1) de post-traitement thermique d'une installation à bande continue. La construction support (2) est conçue de manière telle qu'un dispositif avant de rouleaux peut être déplacé dans la construction horizontalement vers l'avant et vers l'arrière sur au moins un chariot de bouclage (3). L'interaction avec une disposition arrière de rouleaux (4) fixe permet de guider une bande en boucles à travers la chambre de traitement, le déplacement de la disposition avant vers l'avant ou vers l'arrière permettant d'obtenir des longueurs de boucle différentes et donc des temps de traitement différents. Grâce à l'invention, lors du passage d'une bande dans une zone de post-traitement thermique flexible présentant une disposition horizontale, les temps de passage sont adaptés de manière optimale aux exigences du type d'acier respectif traité.
EP17781402.7A 2016-09-13 2017-09-15 Installation de traitement à chaud, flexible, pour une bande métallique dans une construction horizontale Pending EP3512969A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016011047.3A DE102016011047A1 (de) 2016-09-13 2016-09-13 Flexible Wärmebehandlungsanlage für metallisches Band in horizontaler Bauweise
PCT/EP2017/073347 WO2018050857A1 (fr) 2016-09-13 2017-09-15 Installation de traitement à chaud, flexible, pour une bande métallique dans une construction horizontale

Publications (1)

Publication Number Publication Date
EP3512969A1 true EP3512969A1 (fr) 2019-07-24

Family

ID=60051474

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17781402.7A Pending EP3512969A1 (fr) 2016-09-13 2017-09-15 Installation de traitement à chaud, flexible, pour une bande métallique dans une construction horizontale

Country Status (3)

Country Link
EP (1) EP3512969A1 (fr)
DE (1) DE102016011047A1 (fr)
WO (1) WO2018050857A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022248089A1 (fr) * 2021-05-27 2022-12-01 Andritz Technology And Asset Management Gmbh Dispositif et procédé de traitement thermique d'une bande métallique

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115232948B (zh) * 2021-06-11 2024-02-09 中国机械总院集团北京机电研究所有限公司 一种钢质筒形件卧式形性协同调控热处理方法

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AT299103B (de) 1970-10-19 1972-06-12 Voest Ag Bandspeicher, insbesondere für Blechbänder
JPS535607B2 (fr) 1973-01-11 1978-03-01
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EP0072874B1 (fr) 1981-08-25 1985-05-29 Nippon Steel Corporation Installation à double function pour la fabrication d'une tôle d'acier laminée à froid et revêtue à chaud
DE3636652C1 (de) 1986-10-28 1988-01-28 Bwg Bergwerk Walzwerk Bandspeicher
US4759807A (en) 1986-12-29 1988-07-26 Rasmet Ky Method for producing non-aging hot-dip galvanized steel strip
EP0406619A1 (fr) 1989-06-21 1991-01-09 Nippon Steel Corporation Procédé pour la fabrication de tôles d'acier laminées à froid, galvanisées non vieillissantes et ayant une bonne aptitude au formage, dans une ligne de galvanisation continue
DE4038186C1 (en) 1990-11-30 1992-05-27 Hoesch Stahl Ag, 4600 Dortmund, De Steel strip prodn. without over ageing - comprises hot and cold rolling, and continuously annealing slab, then passing through three cooling phases
DE19542184A1 (de) 1995-11-13 1997-05-15 Schloemann Siemag Ag Horizontaler Bandspeicher
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DE29822325U1 (de) 1998-12-04 1999-03-04 Mannemann AG, 40213 Düsseldorf Vertikaler Bandspeicher zur Überbrückung von Bandlaufunterbrechungen
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UA112771C2 (uk) 2011-05-10 2016-10-25 Арселормітталь Інвестігасьон І Десароло Сл Сталевий лист з високою механічною міцністю, пластичністю і формованістю, спосіб виготовлення та застосування таких листів
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DE102015001438A1 (de) * 2015-02-04 2016-08-18 Bernhard Engl Flexible Wärmebehandlungsanlage für metalisches Band

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022248089A1 (fr) * 2021-05-27 2022-12-01 Andritz Technology And Asset Management Gmbh Dispositif et procédé de traitement thermique d'une bande métallique

Also Published As

Publication number Publication date
DE102016011047A1 (de) 2018-03-15
WO2018050857A1 (fr) 2018-03-22

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