WO2004111279A2 - Verfahren und anlage zur herstellung von warmband mit dualphasengefüge - Google Patents

Verfahren und anlage zur herstellung von warmband mit dualphasengefüge Download PDF

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Publication number
WO2004111279A2
WO2004111279A2 PCT/EP2004/006170 EP2004006170W WO2004111279A2 WO 2004111279 A2 WO2004111279 A2 WO 2004111279A2 EP 2004006170 W EP2004006170 W EP 2004006170W WO 2004111279 A2 WO2004111279 A2 WO 2004111279A2
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WO
WIPO (PCT)
Prior art keywords
cooling
strip
temperature
ferrite
hot
Prior art date
Application number
PCT/EP2004/006170
Other languages
German (de)
English (en)
French (fr)
Other versions
WO2004111279A3 (de
Inventor
Karl-Ernst Hensger
Wolfgang Hennig
Tillmann BÖCHER
Christian Bilgen
Original Assignee
Sms Demag Aktiengesellschaft
Aceria Compacta De Bizkaia S.A.
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=33546580&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2004111279(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Sms Demag Aktiengesellschaft, Aceria Compacta De Bizkaia S.A. filed Critical Sms Demag Aktiengesellschaft
Priority to US10/561,385 priority Critical patent/US20070175548A1/en
Priority to JP2006515855A priority patent/JP5186636B2/ja
Priority to EP04739698.1A priority patent/EP1633894B1/de
Priority to CA2529837A priority patent/CA2529837C/en
Priority to UAA200600445A priority patent/UA81329C2/uk
Publication of WO2004111279A2 publication Critical patent/WO2004111279A2/de
Publication of WO2004111279A3 publication Critical patent/WO2004111279A3/de
Priority to EGNA2005000837 priority patent/EG23893A/xx

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
    • 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
    • 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
    • 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
    • B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
    • 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
    • B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
    • 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
    • C21D11/005—Process control or regulation for heat treatments for cooling
    • 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
    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • B21B1/463—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 in a continuous process, i.e. the cast not being cut before 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/02—Hardening articles or materials formed by forging or rolling, with no further heating beyond that required for the formation
    • 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
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • 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
    • 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
    • C21D2211/008—Martensite

Definitions

  • the invention relates to a method for producing hot strip with a dual-phase structure made of ferrite and martensite, wherein at least 70% of the austenite is converted into ferrite from the hot-rolled state by controlled two-stage cooling after the finish rolling to a strip temperature below the martensite start temperature in one Cooling section from water cooling groups arranged one behind the other.
  • the targeted structural transformation by means of a controlled cooling of the steels is known, and for the production of dual-phase steels this controlled cooling is carried out after the hot strip has been formed.
  • the setting of the achievable dual-phase structure essentially depends on the cooling speeds that are technically possible in the system and the chemical composition of the steel. In any case, it is important to have sufficient ferrite formation of at least 70% in the first cooling stage. During this first cooling stage, conversion of the austenite in the pearlite stage should be avoided.
  • the cooling capacity of the second cooling stage following the first cooling stage must be large enough that reel temperatures below the martensite start temperature are reached. Only then is the formation of a dual phase structure with ferritic and martensitic components ensured.
  • EP 0 747 495 B1 describes a process for producing high-strength steel sheet with a structure of at least 75% ferrite, at least 10% martensite and optionally bainite and residual austenite. It is therefore not a structure of pure dual-phase steels.
  • a steel micro-alloyed with niobium is used as the alloy.
  • the hot-rolled steel sheet is specifically cooled, with slow cooling being followed by rapid cooling, or alternatively, the slow cooling is first preceded by rapid cooling.
  • Specified point and 730 0 C - for the first cooling stage a cooling 2-15 ° C / s within a period of 8 to 40 seconds cooling time to a final temperature between the An is.
  • the second cooling stage is conducted at a cooling rate of 20 to 150 0 CVs up to a temperature of 300 0 C.
  • the rapid cooling which alternatively precedes the slow cooling, is carried out at a cooling rate of 20 to 150 ° C./s below the Ar 3 point.
  • EP 1 108 072 B1 describes a process for the production of dual-phase steels, in which after the finish rolling with a two-stage cooling - first slowly, then quickly - a two-phase structure made of 70 to 90% ferrite and 30 to 10% martensite is achieved.
  • the first (slow) cooling is carried out in a cooling section in which the hot strip is cooled in a defined manner by water cooling zones arranged one behind the other at a cooling rate of 20 - 30 K / s.
  • the cooling is set so that the cooling curve enters the ferrite area at such a high temperature that the ferrite can form quickly.
  • This first cooling is continued until at least 70% of the austenite has been converted into ferrite before the further (rapid) cooling follows immediately and without a holding time.
  • the object of the invention to provide a method and a system with or in which the production of hot strip with dual-phase structures in a conventional casting and rolling plant with the local conditions given there and thus time restrictions can also be implemented.
  • the cooling section of such a system is characterized in that the total length generally does not exceed 50 m and no compact cooling is provided.
  • the cooling strategy provides for two-stage cooling with optionally different cooling speeds, which is interrupted by an isothermal holding time of a maximum of 5 seconds.
  • the start of the holding time which corresponds to the end of the first cooling stage, is determined by the entry of the cooling curve into the ferrite area or the start of the austenite transformation into ferrite.
  • the short isothermal cooling pause of a maximum of 5 seconds during which the conversion heat released according to the invention is used to keep the temperature at a constant value and an inevitable cooling of the air is compensated for, the total targeted conversion of the austenite to at least 70% ferrite takes place.
  • the second cooling stage is followed in this holding period immediately by a cooling of the hot strip to a temperature below 300 0 C. Since this temperature is below the martensite start temperature is then held at this cooling with martensite, the second structure component at the desired height.
  • the cooling strategy is determined by a precisely defined, predetermined cooling rate for both cooling stages.
  • these cooling speeds it should be noted that a cooling speed of less than 30 K / s is not possible because of the short time available in the conventional cooling section of a casting and rolling mill, while cooling speeds greater than 150 K / s cannot be achieved in such cooling sections either.
  • the method according to the invention is distinguished not only by a different is sponding chemical composition of the base steel is characterized in that a) the final rolling temperature is well below the A 3 temperature, b) in the second cooling stage to a temperature below 300 0 C cooled, c) the cooling rate below 150 K / s and are above 30 K / s, d) between the two cooling stages there is a very short holding time with a maximum of 5 seconds during which no cooling takes place, e) the conversion to ferrite is isothermal.
  • a plant for carrying out the method of the invention is characterized by a conventional cooling section of a casting and rolling plant, which is arranged behind the last finishing roll stand and has a plurality of controllable water cooling groups with water cooling bars arranged at a distance from one another.
  • the cooling beams in each cooling group are arranged in such a way that a certain amount of water is applied uniformly to the top and bottom of the hot strip.
  • the total amount of water can be regulated by switching individual cooling beams on or off during the rolling process.
  • the number and arrangement of the connected water cooling beams can be variably set in advance in order to optimally adapt the entire cooling section to the cooling conditions to be set
  • FIG. 1 is a time-temperature cooling curve of a hot strip
  • 2 shows a layout of a cooling section in a casting and rolling plant with a 6-stand finishing train
  • FIG. 3 shows a layout of a cooling section in a casting and rolling plant with a 7-stand finishing train.
  • FIG. 1 shows an example of a cooling curve with the time-temperature profile of a hot strip which was cooled in a cooling section 1 on the outlet roller table by the method according to the invention.
  • the hot-rolled strip having the composition: 0.06% C, 0.1% Si, 1, 2% Mn, 0.015% P, 0.06% S, 00.036% Al, 0.15% Cu, 0.054% Ni 1 0, 71% Cr 1 rest Fe and usual accompanying elements were cooled from a set final rolling temperature T fl ni s h of 800 0 C in a first cooling stage with a cooling rate Vi of 54 K / s to a temperature of the hot strip of 670 0 C, at which the Cooling curve entered the ferrite area.
  • FIG. 2 shows an example of the layout of a cooling section 1 of a conventional casting and rolling system designed according to the invention.
  • the cooling section 1 traversed by the hot strip 10 in the transport direction 8 is located between the last finishing stand 2 and the reel 5. Between the last finishing stand 2 and the first water cooling group 3i there is a temperature measuring point 6 for checking the temperature of the hot strip 10 entering the cooling section 1.
  • 2 consists of a total of eight cooling groups 3-
  • FIG. 2 is the typical layout of a cooling section for a 6-stand casting and rolling system, which can be seen from the gap between the cooling groups 3 7 and 4.
  • the subsequent expansion to a 7-stand finishing train often means that, for example, the first cooling group (cooling zone) 3i has to be moved backwards into the structural gap between cooling groups 3 7 and 4.
  • a layout of a cooling section 1 'according to FIG. 3 which differs from the layout of the cooling section 1 of FIG. 2 only in that this structural gap between the cooling groups 3 7 and 4 is eliminated. 3 therefore correspond to the corresponding reference numerals in FIG. 2.
  • An exception is the first cooling group 3i ', whose upper cooling bar, in contrast to the cooling bar of cooling group 3i in FIG. 2, has the usual length of cooling groups 3 2 to 3 7 is formed.
  • each cooling group has four chilled beams on both the top and bottom.
  • Each chilled beam in turn consists of two rows of water tubes for cooling the upper side 10 'and the lower side 10 "of the belt.
  • the cooling group 3i shown in FIG. 2 is shortened by one chilled beam on the upper side for reasons of space.
  • the trimming zone 4 has two valves 7 for each beam. This means that each row of cooling tubes can be controlled individually in the trim zone and the water volume can thus be regulated more precisely.
  • the speed of the strip running out of the finishing train changes and the driving style of the cooling section must be adjusted accordingly in order to adjust the strip properties to be able to set the required time-temperature control.
  • the first necessary cooling stage is achieved with the cooling groups 3i and 3 2
  • the second cooling stage is realized with the groups 3s, 3 6 , 3 7 and 4.
  • the cooling groups 36, 3 7 and 4 are used for the second cooling stage due to the changed boundary conditions.
PCT/EP2004/006170 2003-06-18 2004-06-08 Verfahren und anlage zur herstellung von warmband mit dualphasengefüge WO2004111279A2 (de)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US10/561,385 US20070175548A1 (en) 2003-06-18 2004-06-08 Method and installation for the production of hot-rolled strip having a dual-phase structure
JP2006515855A JP5186636B2 (ja) 2003-06-18 2004-06-08 二相組織を有するホットストリップを製造する方法及び設備
EP04739698.1A EP1633894B1 (de) 2003-06-18 2004-06-08 Verfahren und anlage zur herstellung von warmband mit dualphasengefüge
CA2529837A CA2529837C (en) 2003-06-18 2004-06-08 Method and installation for the production of hot-rolled strip with a dual-phase microstructure
UAA200600445A UA81329C2 (en) 2003-06-18 2004-08-06 Method and cooling device for making of hot-rolled strip with dual-phase structure
EGNA2005000837 EG23893A (en) 2003-06-18 2005-12-17 Method and installation for the production of hot-rolled strip with a dual-phase microstructure

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10327383A DE10327383C5 (de) 2003-06-18 2003-06-18 Anlage zur Herstellung von Warmband mit Dualphasengefüge
DE10327383.2 2003-06-18

Publications (2)

Publication Number Publication Date
WO2004111279A2 true WO2004111279A2 (de) 2004-12-23
WO2004111279A3 WO2004111279A3 (de) 2005-05-06

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2004/006170 WO2004111279A2 (de) 2003-06-18 2004-06-08 Verfahren und anlage zur herstellung von warmband mit dualphasengefüge

Country Status (14)

Country Link
US (1) US20070175548A1 (ja)
EP (1) EP1633894B1 (ja)
JP (1) JP5186636B2 (ja)
KR (1) KR20060057538A (ja)
CN (1) CN100381588C (ja)
CA (1) CA2529837C (ja)
DE (1) DE10327383C5 (ja)
EG (1) EG23893A (ja)
MY (1) MY136875A (ja)
RU (1) RU2346061C2 (ja)
TW (1) TWI300443B (ja)
UA (1) UA81329C2 (ja)
WO (1) WO2004111279A2 (ja)
ZA (1) ZA200509876B (ja)

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EP2361699A1 (de) * 2010-02-26 2011-08-31 Siemens Aktiengesellschaft Verfahren zur Kühlung eines Blechs mittels einer Kühlstrecke, Kühlstrecke und Steuer- und/oder Regeleinrichtung für eine Kühlstrecke
DE102011000089A1 (de) * 2011-01-11 2012-07-12 Thyssenkrupp Steel Europe Ag Verfahren zum Herstellen eines warmgewalzten Stahlflachprodukts
CN103215420B (zh) * 2012-12-31 2015-02-04 西安石油大学 一种大变形管线钢双相组织的获取方法
CN104043660B (zh) * 2013-09-26 2015-09-30 北大方正集团有限公司 一种非调质钢的生产工艺
DE102017206540A1 (de) 2017-04-18 2018-10-18 Sms Group Gmbh Vorrichtung und Verfahren zum Kühlen von Metallbändern oder -blechen
DE102017127470A1 (de) * 2017-11-21 2019-05-23 Sms Group Gmbh Kühlbalken und Kühlprozess mit variabler Abkühlrate für Stahlbleche
DE102017220891A1 (de) * 2017-11-22 2019-05-23 Sms Group Gmbh Verfahren zum Kühlen eines metallischen Guts und Kühlbalken
CN109576581A (zh) 2018-11-30 2019-04-05 宝山钢铁股份有限公司 一种高表面质量、低屈强比热轧高强度钢板及制造方法
CN110724801B (zh) * 2019-10-28 2021-02-12 重庆科技学院 Cr-Mo超高强钢在奥氏体和铁素体两相区等温热处理后直接深冷处理提高强韧性的方法
RU2724217C1 (ru) * 2020-02-04 2020-06-22 Антон Владимирович Шмаков Способ производства стального проката

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CN100447260C (zh) * 2006-06-23 2008-12-31 宝山钢铁股份有限公司 盘式带钢快速冷却试验装置及其使用方法

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MY136875A (en) 2008-11-28
KR20060057538A (ko) 2006-05-26
CA2529837C (en) 2012-08-21
EP1633894B1 (de) 2017-04-26
WO2004111279A3 (de) 2005-05-06
CA2529837A1 (en) 2004-12-23
JP5186636B2 (ja) 2013-04-17
EP1633894A2 (de) 2006-03-15
ZA200509876B (en) 2006-11-29
CN1820086A (zh) 2006-08-16
EG23893A (en) 2007-12-13
RU2006101338A (ru) 2006-06-10
DE10327383B4 (de) 2010-10-14
UA81329C2 (en) 2007-12-25
TWI300443B (en) 2008-09-01
DE10327383C5 (de) 2013-10-17
DE10327383A1 (de) 2005-02-10
RU2346061C2 (ru) 2009-02-10
TW200502405A (en) 2005-01-16
US20070175548A1 (en) 2007-08-02
JP2006527790A (ja) 2006-12-07

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