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WO2000051755A1 - Procede de fabrication de feuilles d'acier lamine a chaud mettant en oeuvre un processus de mini acierie - Google Patents

Procede de fabrication de feuilles d'acier lamine a chaud mettant en oeuvre un processus de mini acierie Download PDF

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Publication number
WO2000051755A1
WO2000051755A1 PCT/KR1999/000102 KR9900102W WO0051755A1 WO 2000051755 A1 WO2000051755 A1 WO 2000051755A1 KR 9900102 W KR9900102 W KR 9900102W WO 0051755 A1 WO0051755 A1 WO 0051755A1
Authority
WO
WIPO (PCT)
Prior art keywords
slabs
flat bars
heating furnace
continuous caster
thickness
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.)
Ceased
Application number
PCT/KR1999/000102
Other languages
English (en)
Inventor
Deung-Mo Che
Sang-Il Lee
Yeoung-Rin Min
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.)
Posco Holdings Inc
Original Assignee
Pohang Iron and Steel Co Ltd
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 Pohang Iron and Steel Co Ltd filed Critical Pohang Iron and Steel Co Ltd
Priority to PCT/KR1999/000102 priority Critical patent/WO2000051755A1/fr
Priority to US09/674,589 priority patent/US6978531B1/en
Publication of WO2000051755A1 publication Critical patent/WO2000051755A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • B21B1/46—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
    • B21B1/466—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 non-continuous process, i.e. the cast being cut before rolling
    • 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
    • B21B1/224—Edge rolling of flat products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B15/0085—Joining ends of material to continuous strip, bar or sheet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2201/00—Special rolling modes
    • B21B2201/14—Soft reduction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/004—Heating the product

Definitions

  • the present invention relates to a method of manufacturing hot rolled steel sheets using a mini mill process, and more particularly, to a method in which ultra-thin strip production of hot rolled steel sheets is possible using a mini mill process.
  • mini mill steel making process the final product is produced in a minimal amount of time using directly connected, short processes starting from a continuous casting process to a rolling process. Accordingly, the mini mill steel making process differs significantly from the blast furnace steel making process.
  • mini mill processes can be generally divided into two categories depending on the thickness of the resulting slab: a thin slab process in which slabs of less than 70mm in thickness are produced, and a medium slab process in which slabs of greater than 70mm in thickness are produced. Also the mini mill process can be divided into two categories depending on the heating and rolling methods used. As far as the actual method of production is concerned, the typical mini mill processes include the ISP (in-line strip production) process, the CSP (compact strip production) process and the Danieli process .
  • ISP in-line strip production
  • CSP compact strip production
  • FIG. 4 shows a schematic view of an ISP process production line.
  • molten steel contained in a ladle 91 is poured into a tundish 92, then passes through a continuous caster 101 , having a 75mm mold, and a liquid core reducer 102. Passing through the continuous caster 101 , the molten steel is cast into slabs having a thickness of roughly 60mm.
  • the slabs, without first being cut to a predetermined length, are descaled in a first descaler 108a, then directly rolled in a reduction unit 103 to produce flat bars having a thickness of 20-30mm.
  • the flat bars are cut to suitable lengths by a first cutter 104a.
  • the cut flat bars are then heated in a heating furnace 105 and coiled in a coiling station 106a.
  • the coiled flat bars are uncoiled in an uncoiler 106b then descaled in a second descaler 108b.
  • the flat bars are rolled in a finishing mill 107 to a predetermined final thickness, after which the flat bars are cooled in a cooler 120 and finally coiled in a down coiler 121.
  • Reference numeral 104b in FIG. 4 refers to a second cutter.
  • the continuous caster 101 and the reduction unit 103 are in effect connected through the slabs being passed therethrough.
  • the high temperature slabs cast in the continuous caster 101 are rolled in the reduction unit 103, there will be a possibility of the reduction unit 103 to be deformed by the temperature of the slabs.
  • the cast slabs are directly rolled in the reduction unit 103 without any heating. As a result, a difference in temperature between edges and a center of the slabs may occur, causing surface defects in the slabs.
  • descaling is performed in the first descaler 108a immediately following continuous casting, optimal descaling is not achieved.
  • molten steel contained in a ladle 91 is poured into a tundish 92 as in the ISP process described above.
  • the molten steel is cast into slabs after passing through a continuous caster 201 and a liquid core reducer 202.
  • the slabs are then cut to suitable lengths by a cutter 204.
  • the cut slabs are heated in a heating furnace 205 having a length of at least 170m.
  • the slabs are heated to a temperature suitable for rolling.
  • the heated slabs are descaled by a descaler 208 then rolled by six rollers, after which the rolled slabs are cooled by a cooler 220 then coiled by a coiler 221.
  • FIG. 6 illustrating a schematic view of the Danieli process production line, after molten steel in a ladle 91 is poured into a tundish 92, the molten steel being solidified undergoes soft reduction in a 90mm mold of a continuous caster 301 and a liquid core reducer 302 such that slabs of 70mm in thickness are produced. The slabs are then cut to suitable lengths by a first cutter 304a.
  • the cut slabs are descaled in a first descaler 308a then heated to a temperature suitable for rolling in a first heating furnace 305.
  • the first heating furnace 305 has a substantial length so that a plurality of slabs can be heated therein at one time.
  • both a roughing mill 303 and a finishing mill 307 are provided. That is, after the slabs are rolled into flat bars by the roughing mill 303, the flat bars undergo rolling also in the finishing mill 307.
  • a heated cover 305b is provided between the roughing mill and finishing mills 303 and 307 to ensure that the flat bars are maintained at an appropriate temperature before being supplied to the finishing mill 307.
  • the length of the heated cover 305b is determined depending on a length of one flat bar.
  • the flat bars are cooled by a cooler 320 then coiled by a final coiler 321.
  • Reference numeral 322 in FIG. 6 refers to a width roller, and reference numerals 304b, 308b and 308c refer respectively to a second cutter, a second descaler and a third descaler.
  • the present invention has been made in an effort to solve the above problems.
  • the present invention provides a method of manufacturing hot rolled steel sheets using a mini mill process.
  • the method includes the steps of passing molten steel through a continuous caster having a mold after having been poured into a ladle and a tundish to manufacture a slab; cutting the slab to predetermined lengths using a cutter to form a plurality of cut slabs; heating the cut slabs to a predetermined temperature in a first heating furnace; descaling the cut slabs heated in the first heating furnace; rolling the slabs in a reduction unit to a predetermined thickness to form a plurality of flat bars; heating the flat bars to a predetermined temperature in a second heating furnace; coiling the flat bars by a coiling station while the flat bars are maintained in a heated state; uncoiling the flat bars by an uncoiler; and rolling the flat bars to a predetermined thickness in a finishing mill.
  • the slabs are heated to a temperature 1000°C and above by the first heating furnace. According to another feature of the present invention, the slabs are heated to a temperature between 1000 and 1200°C for 5-6 minutes by the first heating furnace.
  • the slabs undergo width rolling before being descaled and after being heated by the first heating furnace.
  • the slabs being rolled in the reduction unit are maintained to a temperature between 800 and 1000°C at an output of the reduction unit.
  • the slabs casted in the continuous caster undergo liquid core reduction.
  • a thickness of the slabs casted in the continuous caster is 100mm, and the slabs undergo liquid core reduction to a thickness of 80mm.
  • the flat bars are cut to a predetermined length; ends of the flat bars are joined; the flat bars are rolled to a predetermined thickness in the finishing mill; and the flat bars are cut to a predetermined length.
  • FIG. 1 is a schematic view of a production line for a mini mill process according to a first preferred embodiment of the present invention
  • FIG. 2 is a schematic view of a production line for a mini mill process according to a second preferred embodiment of the present invention
  • FIG. 3 is a graph illustrating at which relation between an isothermal maintenance time and an isothermal maintenance temperature edge crack occurs;
  • FIG. 4 is a schematic view of a production line for a conventional ISP mini mill process;
  • FIG. 5 is a schematic view of a production line for a conventional CSP mini mill process.
  • FIG. 6 is a schematic view of a production line for a conventional Danieli mini mill process.
  • FIG. 1 shows a schematic view of a production line for a mini mill process according to a first preferred embodiment of the present invention.
  • Molten steel is poured into a ladle 91 and a tundish 92 continuously, then passed through a continuous caster 11 having a mold such that the molten steel is manufactured into a continuous slab. It is also possible to provide a liquid core reducer 12 downstream from the continuous caster 11 where the continuous slab undergoes reduction.
  • the mold of the continuous caster 11 is a straight parallel mold.
  • the mold of the continuous caster 11 preferably has an interval of approximately 100mm. This is done to minimize an output opening of the mold taking into consideration a refractory life, and to minimize an amount and speed of output flow such that a temperature of the molten steel in the mold is maintained at a uniform level. Accordingly, a high degree of quality can be ensured. Further, it is preferable that the liquid core reducer 12 performs an approximately 20mm core reduction. In this way, by controlling conditions of the continuous casting and the liquid reduction, a slab of approximately 80mm is produced such that load given to a roller is reduced and quality is improved.
  • a first cutter 14a is provided upstream from a first heating furnace 15a.
  • the first cutter 14a cuts the slabs to predetermined suitable lengths such that the continuous casting process and a subsequent rolling operation are independently performed such that control problems do not occur and greater stability is achieved.
  • the cut slabs pass through the first heating furnace 15a, where the slabs are heated to a temperature suitable for rolling, after which the slabs are rolled in a reduction unit 13.
  • the heating temperature is over 1000°C, and more preferably between 1000 and 1200°C. Further, it is preferable that the slabs are heated at the preferred temperature for approximately 5-6 minutes.
  • grain boundary strength is reduced such that cracks occur during rolling.
  • Mn manganese
  • the slabs are heated to the conditions as described above before being rolled by the reduction unit 13 so that during the phase transformation of ⁇ ⁇ ⁇ , S, which is segregated on grain boundaries, does not react with Fe, but rather with Mn to form MnS, thereby preventing the formation of cracks during rolling.
  • the slabs heated as in the above then undergo descaling by a first descaler 18a before being rolled by the reduction unit 13. Since the slabs are descaled in the present invention after being heated, rather than immediately following continuous casting, this descaling operation can be effectively carried out. That is, after heating the slabs, scales on the slabs are thick and a number of pores thereon are high such that a bonding force between the scales and the slabs is weak, thereby enabling easy descaling of the slabs.
  • a width roller 22 is mounted upstream from the first descaler
  • the width of the slabs is rolled to an amount corresponding to a thickness of the slabs, and the width roller 22 enables the width of the slabs to be rolled up to roughly 14-15mm. Further, by the width rolling of the slabs before the descaling operation, cracks are formed on the scales such that the subsequent descaling of the slabs is improved.
  • the descaled slabs are rolled in the reduction unit 13.
  • a rolling amount and a number of roller stands used are determined by considering a desired thickness of the final product.
  • the reduction unit 13 includes three stands that are structured such that an 80mm slab enters the reduction unit 13 and is formed into 15-30mm flat bars.
  • the reduction unit 13 it is possible for the reduction unit 13 to include only two stands to form 20-30mm flat bars.
  • Flat bars exiting the reduction unit 13 are at a temperature between 800 and 1000°C.
  • a second heating furnace 15b is provided downstream from the reduction unit 13.
  • the second heating furnace 5b heats the flat bars exiting the reduction unit 13 to a temperature between 1030 and 1080°C such that a finishing mill 17 can more easily roll the flat bars, thereby enabling the economic manufacture of ultra-thin strips.
  • an inductive heater for the second heating furnace 15b.
  • output of the inductive heater is determined by the degree to which the temperature of the flat bars is increased, the inductive heater being flexibly used depending on an output temperature of the reduction unit 13.
  • an extractor is mounted in the second heating furnace 15b to extract defective, particularly start and end defective slabs.
  • the flat bars heated by the second heating furnace 15b are then coiled in a coiling station 16a.
  • the coiling station 16a is mounted in a holding furnace 15c so that the temperature to which the flat bars are raised by the second heating furnace 15b can be maintained.
  • a size of the holding furnace 15c is such that it can hold about 8-10 bar coils at one time so that if problems occur in the finishing mill 17, the continuous caster 11 can proceed with its casting operation and does not need to be stopped.
  • the bar coils are then uncoiled in an uncoiler 16b before being supplied to the finishing mill 17 where the flat bars undergo a final rolling process. It is preferable that a second cutter 14b is provided between the uncoiler 16b and the finishing mill 17. The second cutter 14b cuts ends of the flat bars so that the final rolling process is proceeded without any interruption.
  • a second descaler 18b is provided immediately upstream from the finishing mill 17, between the second cutter 14b and the finishing mill 17. Further, since a number of stands of the finishing mill 17 determines a thickness of the final product, it is preferable to provide a total of 5 stands for the finishing mill 17 to enable the ultra-thin strip production of hot rolled steel sheets. Moreover, to ensure the high quality formation of the final product, it is preferable to maintain a predetermined roll interval. A formation controller (not shown) can be provided for this purpose. Also, it is preferable to provide a grinder (not shown) which grinds the rolls to control friction between edge portions of the rolls.
  • a cooler 20 is provided downstream from the finishing mill 17, and the flat bars rolled in the finishing mill 17 are supplied to the cooler 20 where the flat bars are cooled. Further, a down coiler 21 is provided downstream from the cooler 20. The flat bars cooled in the cooler 20 are coiled in the down coiler 21.
  • FIG. 1 the above first cutting process, first heating process, width rolling process, first descaling process, first rolling process, second heating process, and first coiling process can be simultaneously performed at a plurality of locations to increase productivity.
  • FIG. 2 shows a schematic view of a production line for a mini mill process according to a modified example of the first preferred embodiment of the present invention.
  • identical reference numerals will be used for elements similar to those appearing in FIG. 1 , and except for added elements, it is to be assumed that the elements appearing in both the drawings are identical in operation.
  • a plurality of uncoilers 31 are provided downstream from the coiling stations 16a.
  • a bar joiner 32 is provided downstream from the second cutter 14b, between the second cutter 14b and the second descaler 18b.
  • the bar joiner 32 joins a rear end of a bar undergoing rolling in the finishing mill to a front end of a bar waiting to be rolled such that the flat bars can be continuously rolled.
  • a high speed cutter 33 is provided between the cooler 20 and the down coiler 21 which cuts the flat bars cooled in the coiler 20 to suitable lengths.
  • a structure of the plurality of uncoilers 31 is commonly known in the art.
  • FIG. 3 is a graph illustrating at which relation between an isothermal maintenance time and an isothermal maintenance temperature that edge crack occurs. As shown in the drawing, if maintained for a suitable amount of time at a temperature above 900°C, no edge crack occurs.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)

Abstract

L'invention se rapporte à un procédé de fabrication de feuilles d'acier laminé à chaud. Ledit procédé consiste à faire passer de l'acier fondu dans un appareil de moulage en continu (11) comportant un moule, après l'avoir fait passer dans une poche de coulée (91) et un panier de coulée (92), de manière à produire une brame; à découper la brame en longueurs préétablies à l'aide d'un dispositif de coupe (14a) de manière à produire une pluralité de brames découpées; à chauffer les brames découpées à une température préétablie dans un premier four à réchauffer (15a); à décalaminer les brames découpées et chauffées dans le premier four à réchauffer; à laminer les brames dans une unité réductrice (13) jusqu'à une épaisseur préétablie de manière à produire une pluralité de barres plates; à chauffer les barres plates à une température préétablie dans un second four à réchauffer (15b); à enrouler les barres plates dans une station d'enroulage (16a) tandis que les barres plates sont maintenues dans un état chauffé; à dérouler les barres plates au moyen d'un dispositif dérouleur (16b) puis à laminer les barres plates jusqu'à obtenir une épaisseur préétablie dans un laminoir finisseur.
PCT/KR1999/000102 1997-12-09 1999-03-04 Procede de fabrication de feuilles d'acier lamine a chaud mettant en oeuvre un processus de mini acierie Ceased WO2000051755A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/KR1999/000102 WO2000051755A1 (fr) 1999-03-04 1999-03-04 Procede de fabrication de feuilles d'acier lamine a chaud mettant en oeuvre un processus de mini acierie
US09/674,589 US6978531B1 (en) 1997-12-09 1999-03-04 Method of manufacturing hot rolled steel sheet using mini mill process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR1999/000102 WO2000051755A1 (fr) 1999-03-04 1999-03-04 Procede de fabrication de feuilles d'acier lamine a chaud mettant en oeuvre un processus de mini acierie

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WO2000051755A1 true WO2000051755A1 (fr) 2000-09-08

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003018222A1 (fr) * 2001-08-22 2003-03-06 Sms Demag Aktiengesellschaft Procede et installation de laminage et de coulee en continu pour produire un feuillard metallique, notamment un feuillard en acier lamine a chaud, a partir d'un pre-feuillard coule en continu
AT523062A4 (de) * 2020-02-11 2021-05-15 Primetals Technologies Austria GmbH Produktionsanlage und Verfahren zum Betrieb solch einer Produktionsanlage
EP4122613A1 (fr) * 2021-07-23 2023-01-25 SMS Group GmbH Procédé de fabrication d'une bande métallique

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992000815A1 (fr) * 1990-07-09 1992-01-23 Hoogovens Groep Bv Procede et installation de production de bobines de feuilles d'acier possedant les caracteristiques d'un produit lamine a froid, et directement obtenu d'un train de laminage a chaud
EP0595282A1 (fr) * 1992-10-28 1994-05-04 Sms Schloemann-Siemag Aktiengesellschaft Procédé et installation pour la fabrication de bandes d'acier laminées à chaud, en particulier à partir d'une ébauche de bande coulée en continu
EP0674952A1 (fr) * 1994-03-31 1995-10-04 DANIELI & C. OFFICINE MECCANICHE S.p.A. Procédé de production d'une bande d'acier, à partir des brammes minces, et installation correspondante
EP0770433A1 (fr) * 1995-10-27 1997-05-02 DANIELI & C. OFFICINE MECCANICHE S.p.A. Procédé et installation de laminage pour laminer des feuillards et des tÔles

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992000815A1 (fr) * 1990-07-09 1992-01-23 Hoogovens Groep Bv Procede et installation de production de bobines de feuilles d'acier possedant les caracteristiques d'un produit lamine a froid, et directement obtenu d'un train de laminage a chaud
EP0595282A1 (fr) * 1992-10-28 1994-05-04 Sms Schloemann-Siemag Aktiengesellschaft Procédé et installation pour la fabrication de bandes d'acier laminées à chaud, en particulier à partir d'une ébauche de bande coulée en continu
EP0674952A1 (fr) * 1994-03-31 1995-10-04 DANIELI & C. OFFICINE MECCANICHE S.p.A. Procédé de production d'une bande d'acier, à partir des brammes minces, et installation correspondante
EP0770433A1 (fr) * 1995-10-27 1997-05-02 DANIELI & C. OFFICINE MECCANICHE S.p.A. Procédé et installation de laminage pour laminer des feuillards et des tÔles

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003018222A1 (fr) * 2001-08-22 2003-03-06 Sms Demag Aktiengesellschaft Procede et installation de laminage et de coulee en continu pour produire un feuillard metallique, notamment un feuillard en acier lamine a chaud, a partir d'un pre-feuillard coule en continu
AT523062A4 (de) * 2020-02-11 2021-05-15 Primetals Technologies Austria GmbH Produktionsanlage und Verfahren zum Betrieb solch einer Produktionsanlage
AT523062B1 (de) * 2020-02-11 2021-05-15 Primetals Technologies Austria GmbH Produktionsanlage und Verfahren zum Betrieb solch einer Produktionsanlage
EP4122613A1 (fr) * 2021-07-23 2023-01-25 SMS Group GmbH Procédé de fabrication d'une bande métallique

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