US20070175548A1 - Method and installation for the production of hot-rolled strip having a dual-phase structure - Google Patents

Method and installation for the production of hot-rolled strip having a dual-phase structure Download PDF

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Publication number
US20070175548A1
US20070175548A1 US10/561,385 US56138504A US2007175548A1 US 20070175548 A1 US20070175548 A1 US 20070175548A1 US 56138504 A US56138504 A US 56138504A US 2007175548 A1 US2007175548 A1 US 2007175548A1
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United States
Prior art keywords
cooling
strip
hot
temperature
ferrite
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Abandoned
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US10/561,385
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English (en)
Inventor
Karl-Ernst Hensger
Wolfgang Hennig
Tillmann Bocher
Christian Bilgen
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SMS Siemag AG
ArcelorMittal Sestao SL
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Individual
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Application filed by Individual filed Critical Individual
Assigned to SMS DEMAG AG, ACERIA COMPACTA DE BIZKAIA S.A. reassignment SMS DEMAG AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BILGEN, CHRISTIAN, BOCHER, TILLMANN, HENNIG, WOLFGANG, HENSGER, KARL-ERNST
Publication of US20070175548A1 publication Critical patent/US20070175548A1/en
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    • 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 concerns a method for producing hot-rolled strip with a dual-phase microstructure consisting of ferrite and martensite, wherein at least 70% of the austenite is transformed to ferrite from the hot-rolled state by a controlled two-stage cooling operation after the finish rolling to a strip temperature below the martensite start temperature in a cooling line that consists of successive, spaced water cooling units.
  • Systematic microstructural transformation by controlled cooling is steels is well known, and to produce dual-phase steels, this controlled cooling is carried out after the working of the hot strip is complete.
  • the adjustment of the attainable dual-phase microstructure depends essentially on the cooling rates that are technically possible in the installation and on the chemical composition of the steel. In this regard, it is important in any case to achieve sufficient ferrite formation of at least 70% in the first cooling stage. During this first cooling stage, transformation 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 sufficiently high that coiling temperatures below the martensite start temperature are reached. Only then is the formation of a dual-phase microstructure with ferritic and martensitic constituents ensured.
  • EP 0 747 495 B1 describes a method for producing high-strength steel plate with a microstructure consisting of 75% ferrite, at least 10% martensite and possibly bainite and retained austenite. Accordingly, this is not a microstructure of pure dual-phase steels.
  • a steel microalloyed with niobium is used as the alloy. It is produced by systematically cooling the hot-rolled steel plate, wherein a rapid cooling follows a slow cooling or, alternatively, a rapid cooling precedes the slow cooling.
  • a cooling rate of 2-15° C./s within a cooling time of 8-40 s is given for the first cooling stage to a final temperature between the AR, point and 730° C.
  • the steel is cooled to a temperature of 300° C. at a cooling rate of 20-150° C./s.
  • rapid cooling is carried out to a temperature below the Ar 3 point at a cooling rate of 20-150° C./s.
  • EP 1 108 072 B1 describes a method for producing dual-phase steels, in which a dual-phase microstructure consisting of 70-90% ferrite and 30-10% martensite is achieved with a two-stage cooling operation (first slow, then rapid) carried out after the finish rolling.
  • the first (slow) cooling is carried out in a cooling line in which the hot-rolled strip is cooled in a well-defined way by successive, spaced water cooling zones at a cooling rate of 20-30 K/s.
  • the cooling is adjusted in such a way that the cooling curve enters the ferrite range at a temperature that is still so high that ferrite formation can occur rapidly.
  • the first cooling is continued until at least 70% of the austenite has transformed to ferrite. This cooling stage is immediately followed by the other (rapid) cooling stage without any holding time.
  • the objective of the invention is to specify a method by which and an installation in which the production of hot-rolled strip with dual-phase microstructure can be carried out in a conventional continuous casting and rolling installation with the local limitations that exist there and thus with the given time constraints.
  • the cooling line of an installation of this type is characterized by the fact that the total length generally does not exceed 50 m and that compact cooling is not provided.
  • the objective with respect to the method is achieved with the characterizing features of claim 1 .
  • the first cooling stage is carried out until the cooling curve enters the ferrite range, and then the heat of transformation liberated by the transformation of the austenite to ferrite is used for isothermally holding the strip temperature thereby reached for a holding time of 5 s until the beginning of the second cooling stage.
  • the cooling strategy involves two cooling stages that have selectively variable cooling rates and are interrupted by an isothermal holding time of a maximum of 5 s.
  • the beginning of the holding time which corresponds to the end of the first cooling stage, is determined by the entrance of the cooling curve into the ferrite range, i.e., the point at which the austenite starts to transform to ferrite.
  • the entire desired transformation of the austenite to at least 70% ferrite occurs in the short isothermal cooling interruption of a maximum of 5 s, during which, in accordance with the invention, the liberated heat of transformation holds the temperature at a constant value by compensating unavoidable air cooling.
  • This holding time is then immediately followed by the second cooling stage, during which the hot-rolled strip is cooled to a temperature below 300° C. Since this temperature is below the martensite start temperature, the desired level of martensite, which is the second constituent of the dual-phase microstructure, is thus obtained.
  • the cooling strategy is defined by an exactly defined, predetermined cooling rate for both cooling stages.
  • the method of the invention is characterized not only by the fact that the initial steel has a different chemical composition but also by the fact that
  • a continuous casting and rolling installation for carrying out the method of the invention is characterized by a conventional cooling line that is installed after the last finishing stand and has several successive, spaced water cooling units, which can be automatically controlled.
  • the spray bars present in each cooling unit are arranged in such a way that a specific amount of water is uniformly sprayed onto the upper and lower surfaces of the hot-rolled strip.
  • the total amount of water can be automatically controlled by turning individual spray bars on or off during rolling.
  • the number and arrangement of the water spray bars that are turned on can be variably adjusted in advance to obtain an optimum adjustment of the entire cooling line to the cooling conditions that are to be established.
  • FIG. 1 shows a time-temperature cooling curve of a hot-rolled strip.
  • FIG. 2 shows a layout of a cooling line in a continuous casting and rolling installation with a 6-stand finishing train.
  • FIG. 3 shows a layout of a cooling line in a continuous casting and rolling installation with a 7-stand finishing train.
  • FIG. 1 shows an example of a time-temperature cooling curve of a hot-rolled strip that was cooled by the method of the invention on the runout roller table in a cooling line 1 .
  • the hot-rolled strip which had the following composition: 0.06% C, 0.1% Si, 1.2% Mn, 0.015% P, 0.06% S, 0.036% Al, 0.15% Cu, 0.054% Ni, 0.71% Cr, the remainder consisting of Fe and customary trace elements, was cooled in a first cooling stage at a cooling rate V 1 of 54 K/s from an adjusted finish rolling temperature T finish of 800° C. to a hot-rolled strip temperature of 670° C., at which the cooling curve entered the ferrite range.
  • the temperature of the hot-rolled strip remained at this holding temperature T const. , and then the final cooling was carried out in a second cooling stage, in which the strip was cooled to a temperature below 300° C. (about 250° C. coiling temperature) at a cooling rate V 2 of 84 K/s.
  • Tests on the hot-rolled strip produced by this method which had a dual-phase microstructure in the desired range of at least 70% ferrite and less than 20% martensite, yielded a tensile strength of 620 MPa combined with a ratio of yield stress to tensile strength of 0.52.
  • FIG. 2 shows an example of a layout of a cooling line 1 of a conventional continuous casting and rolling installation.
  • the cooling line 1 through which the hot-rolled strip passes in direction of conveyance 8 , is located between the last finishing stand 2 and the coiler 5 .
  • a temperature-measuring point 6 for monitoring the temperature of the hot-rolled strip 10 entering the cooling line 1 is located between the last finishing stand 2 and the first water cooling unit 3 1 .
  • the cooling line 1 shown in FIG. 2 comprises a total of eight cooling units 3 1-7 and 4 . The latter is often realized as a trimming zone 4 .
  • a conventional cooling line comprises six to nine cooling units, depending on the particular continuous casting and rolling installation.
  • FIG. 2 is the typical layout of a cooling line for a 6-stand continuous casting and rolling installation, as is apparent from the gap between cooling units 3 7 and 4 .
  • Subsequent conversion to a 7-stand finishing train often requires that, for example, the first cooling unit (cooling zone) 3 1 be moved to the rear into the structural gap between the cooling units 3 7 and 4 .
  • the cooling line 1 ′ has a layout of the type shown in FIG. 3 , which differs from the layout of the cooling line 1 in FIG. 2 only by the elimination of this structural gap between the cooling units 3 7 and 4 . Therefore, the reference numbers of the individual structural parts and assemblies of FIG. 3 are the same as the reference numbers of FIG. 2 .
  • An exception to this is the first cooling unit 3 1 ′, whose upper spray bar, in contrast to the spray bar of cooling unit 3 1 in FIG. 2 , is designed with the standard length of the cooling units 3 2 to 3 7 .
  • each cooling unit has four spray bars on both the upper side and the lower side.
  • Each spray bar in turn consists of two rows of small water pipes for cooling the upper surface of the strip 10 ′ and the lower surface of the strip 10 ′′.
  • the cooling unit 3 1 in FIG. 2 is shortened by one spray bar on the upper side due to limited space.
  • the trimming zone 4 has two valves 7 for each spray bar. This means that in the trimming zone, each row of small cooling pipes can be individually controlled, and thus the amount of water can be more finely controlled.
  • the delivery speed of the strip from the finishing train varies with the rolled thickness of the finished strip. Accordingly, the mode of operation of the cooling line must be adjusted to be able to adjust the time-temperature control necessary for the adjustment of the strip properties.
  • the first required cooling level is attained with the cooling units 3 1 and 3 2
  • the second cooling level is realized with cooling units 3 5 , 3 6 , 3 7 , and 4 . Due to the altered boundary conditions for a finished strip with a thickness of 2.0 mm, only cooling units 3 6 , 3 7 , and 4 need to be used for the second cooling stage.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Metal Rolling (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
US10/561,385 2003-06-18 2004-06-08 Method and installation for the production of hot-rolled strip having a dual-phase structure Abandoned US20070175548A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10327383.2 2003-06-18
DE10327383A DE10327383C5 (de) 2003-06-18 2003-06-18 Anlage zur Herstellung von Warmband mit Dualphasengefüge
PCT/EP2004/006170 WO2004111279A2 (de) 2003-06-18 2004-06-08 Verfahren und anlage zur herstellung von warmband mit dualphasengefüge

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US20070175548A1 true US20070175548A1 (en) 2007-08-02

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US10/561,385 Abandoned US20070175548A1 (en) 2003-06-18 2004-06-08 Method and installation for the production of hot-rolled strip having a dual-phase structure

Country Status (14)

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

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US20140007992A1 (en) * 2011-01-11 2014-01-09 Thyssenkrupp Steel Europe Ag Method for Producing a Hot-Rolled Flat Steel Product
EP3050992A4 (en) * 2013-09-26 2017-10-11 Peking University Founder Group Co., Ltd Production process for non-quenched and tempered steel
US10220425B2 (en) 2010-02-26 2019-03-05 Primetals Technologies Germany Gmbh Method for cooling sheet metal by means of a cooling section, cooling section and control device for a cooling section

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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
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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US10220425B2 (en) 2010-02-26 2019-03-05 Primetals Technologies Germany Gmbh Method for cooling sheet metal by means of a cooling section, cooling section and control device for a cooling section
US20140007992A1 (en) * 2011-01-11 2014-01-09 Thyssenkrupp Steel Europe Ag Method for Producing a Hot-Rolled Flat Steel Product
EP3050992A4 (en) * 2013-09-26 2017-10-11 Peking University Founder Group Co., Ltd Production process for non-quenched and tempered steel

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ZA200509876B (en) 2006-11-29
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JP2006527790A (ja) 2006-12-07
KR20060057538A (ko) 2006-05-26
WO2004111279A3 (de) 2005-05-06
CN1820086A (zh) 2006-08-16
MY136875A (en) 2008-11-28
EP1633894A2 (de) 2006-03-15
JP5186636B2 (ja) 2013-04-17
DE10327383B4 (de) 2010-10-14
DE10327383A1 (de) 2005-02-10
RU2006101338A (ru) 2006-06-10
CA2529837C (en) 2012-08-21
EP1633894B1 (de) 2017-04-26
UA81329C2 (en) 2007-12-25
RU2346061C2 (ru) 2009-02-10
DE10327383C5 (de) 2013-10-17
CN100381588C (zh) 2008-04-16
WO2004111279A2 (de) 2004-12-23
EG23893A (en) 2007-12-13
CA2529837A1 (en) 2004-12-23

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