WO1993024664A1 - Installation pour le recuit en continu de bandes d'acier - Google Patents

Installation pour le recuit en continu de bandes d'acier Download PDF

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Publication number
WO1993024664A1
WO1993024664A1 PCT/JP1993/000633 JP9300633W WO9324664A1 WO 1993024664 A1 WO1993024664 A1 WO 1993024664A1 JP 9300633 W JP9300633 W JP 9300633W WO 9324664 A1 WO9324664 A1 WO 9324664A1
Authority
WO
WIPO (PCT)
Prior art keywords
roll
steel strip
rolls
furnace
bridle
Prior art date
Application number
PCT/JP1993/000633
Other languages
English (en)
Japanese (ja)
Inventor
Hiroshi Ikegami
Original Assignee
Nippon Steel Corporation
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 Nippon Steel Corporation filed Critical Nippon Steel Corporation
Priority to JP50038594A priority Critical patent/JP3203581B2/ja
Priority to DE69329272T priority patent/DE69329272T2/de
Priority to KR1019930703730A priority patent/KR960006583B1/ko
Priority to EP93910337A priority patent/EP0613958B1/fr
Publication of WO1993024664A1 publication Critical patent/WO1993024664A1/fr

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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • 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

Definitions

  • the present invention relates to a continuous annealing facility for a steel strip after cold rolling.
  • the steel strip refers to a steel strip that is subjected to tin plating, zinc plating, etc. as necessary after continuous annealing, and is finally supplied to the production of cans, steel furniture, automobiles, and the like.
  • the tension of the steel strip in the furnace of the continuous annealing equipment is preferably as large as possible for the purpose of preventing walk and flash ringing, while the tension is preferably as small as possible for the purpose of preventing heat backlash.
  • the tension of the steel strip is reduced in a heating furnace or soaking furnace where the temperature of the steel strip is high in normal operation, and in a cooling furnace where the temperature of the steel strip is relatively low, in an overageing furnace, The tension is being increased.
  • Such a tension distribution can be obtained by finely adjusting the Z-control of the speed of the hearth roll, but if it is desired to change the tension abruptly at a certain point in the furnace, a bridle roll is placed in the furnace. It is common to provide one.
  • Fig. 1 is a drawing showing an example of this.
  • the hearth provided in each furnace is designed to guide the steel strip 1 supplied into each furnace from the inlet side to the outlet side.
  • a roll group consisting of rolls 3, a heating furnace 4, and a bridle roll 2 are provided just before the steel strip 1 that has passed through the soaking furnace 5 enters a quench furnace 6 exposed to a high-speed gas jet.
  • the tension of the steel strip 1 becomes large after passing through the bridle opening 2 and passes through the subsequent quenching furnace 6, overaging furnace 7, and final cooling furnace 8.
  • the bridle opening 2 and the hearth roll 3 provided for such a purpose, of course, must surely restrain the steel strip 1 and cause no slip. Absent. However, in reality, it has been found that the bridle opening 2 and the hearth roll 3 often slip, especially when the steel strip becomes thin, and do not perform their original functions.
  • the present invention solves such a problem, and provides a continuous annealing facility for a steel strip in which the functions of a bridle roll and a heart roll are sufficiently exhibited to stably operate an annealing furnace. Disclosure of the invention
  • the present invention employs the equipment described in the following (1) to (5).
  • a roll with a diameter D such that the surface pressure P expressed by (I) is 10 kPa (kilopascal) or more Continuous annealing equipment for steel strip with p h ( ⁇ 1 + ⁇ 2) D (I) (2)
  • T 2 T 1 ⁇ exp ((I)
  • the tension magnification T 2 / T 1 is uniquely determined by the parameter ⁇ 0 and is not related to the absolute value of the tension.
  • the slip tends to occur when the absolute value of the tension becomes small, that is, the friction coefficient is considered to be affected by the tension.
  • bridle rolls There is no limitation on the number of bridle rolls, and the number of bridle rolls may be one.
  • the bridle roll and the hoop roll are in a state where the steel strip is normally restrained. In order for the bridle roll and hearth roll to function properly, their diameter must be determined so that this surface pressure is equal to or greater than pc.
  • the purpose of the hearth roll is to transport the steel strip without changing its tension.
  • the present inventor has found that at a surface pressure of 10 kPa or less, a kinetic friction state occurs and slippage occurs due to a slight difference in tension between around Haas ⁇ -rule.
  • the phenomenon of slipping with little difference in tension is strange, but since the control device of the motor that drives the hearth roll has no means for knowing the true speed of the steel strip, the roll speed must be reduced. This phenomenon occurs because control is performed to the command value (same as the bridle roll peripheral speed).
  • the roll peripheral speed does not follow the command because the diameter of the hearth roll that has thermally expanded in a high-temperature furnace is not known accurately, which contributes to this phenomenon.
  • the presence of such slippage causes flaws in the steel strip, or permanent slipping, which causes the building door to adhere to the surface of the hearth roll (iron warp-like fixation, which also causes flaws in the steel strip).
  • This problem can be solved by selecting an appropriate roll diameter so that
  • FIG. 1 is a schematic side view showing an example of the arrangement of the in-furnace bridle rolls and hearth holes to which the present invention is applied.
  • Figure 2 is a drawing that generally describes the relationship between the winding angle of the steel strip around the bridle roll and the tension.
  • FIG. 3 is a drawing showing actually measured values obtained by determining the relationship between the surface pressure of a bridle roll and a hearth roll, which are basic data of the present invention, and the friction coefficient.
  • each roll has a different diameter, which is troublesome in both production and maintenance. Therefore, all roll diameters should be less than 390 mm in view of the safe side.
  • the critical surface pressure pc determined from Fig. 3 may change, but the bridle roll diameter or the hearth roll diameter is limited. The basic idea of setting the pressure to be higher than the pressure remains unchanged.
  • the idea of selecting the unit diameter so that the surface pressure P is at a limit value that does not cause slip is based on the bridging roll as described above. Not only can it be applied to all hearth rolls. If the diameter of the hearth opening cannot be reduced due to dimensional restrictions on the equipment, such as a heating furnace equipped with a radial tube, excessive driving force exceeding the torque required to transport the steel strip to the hearth roll.
  • the control system of the hearth roll so as not to add the noise. For example, limit the speed command that is common to the furnace so that the speed error does not exceed a certain value (several mpm). Also, giving proper drooping characteristics is an important technical finding suggested by the present invention. Industrial applicability
  • the bridging roll and the hearth roll provided in the continuous annealing furnace can surely exert the function of amplifying the tension of the steel strip, which is its original function. It is possible to achieve a high level of stable operation of the continuous annealing furnace for steel strip. Also, serious defects such as flaws caused by slip between the steel strip and the roll can be prevented.

Landscapes

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

Abstract

Equipement pour le recuit en continu d'une bande d'acier ayant été laminée à froid, cette installation assurant le fonctionnement stable d'un four de recuit en empêchant le glissement des rouleaux tendeurs et des rouleaux foyers. Le diamètre D des rouleaux tendeurs (2) est déterminé de telle sorte que la pression de surface p^_ exprimée par l'équation p=h(σ1+σ2)/D devienne non inférieure à 10 kPa (Kilopascal); σ1 étant la tension unitaire de la portion de bande d'acier (1) qui se trouve en amont des rouleaux tendeurs (2) et des rouleaux foyers (3) dans le four; σ2 étant la tension unitaire de la portion de bande d'acier (1) qui se trouve en aval des rouleaux (2 et 3); h^_ étant l'épaisseur de la bande d'acier et D le diamètre des rouleaux tendeurs (2).
PCT/JP1993/000633 1992-05-25 1993-05-13 Installation pour le recuit en continu de bandes d'acier WO1993024664A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP50038594A JP3203581B2 (ja) 1992-05-25 1993-05-13 鋼帯の連続焼鈍設備
DE69329272T DE69329272T2 (de) 1992-05-25 1993-05-13 Verfahren zum kontinuierlichen Glühen von Stahlband
KR1019930703730A KR960006583B1 (ko) 1992-05-25 1993-05-13 강대의 연속소둔설비
EP93910337A EP0613958B1 (fr) 1992-05-25 1993-05-13 Procédé pour le recuit en continu de bandes d'acier

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP15624392 1992-05-25
JP4/156243 1992-05-25

Publications (1)

Publication Number Publication Date
WO1993024664A1 true WO1993024664A1 (fr) 1993-12-09

Family

ID=15623509

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1993/000633 WO1993024664A1 (fr) 1992-05-25 1993-05-13 Installation pour le recuit en continu de bandes d'acier

Country Status (6)

Country Link
EP (1) EP0613958B1 (fr)
JP (1) JP3203581B2 (fr)
KR (1) KR960006583B1 (fr)
CN (1) CN1028880C (fr)
DE (1) DE69329272T2 (fr)
WO (1) WO1993024664A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006077301A (ja) * 2004-09-10 2006-03-23 Nippon Steel Corp 鋼板のフラッタリング抑制方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013047808A1 (fr) 2011-09-30 2013-04-04 新日鐵住金株式会社 Feuille d'acier galvanisée par immersion à chaud à haute résistance et son procédé de fabrication
KR101654158B1 (ko) * 2013-07-15 2016-09-09 주식회사 포스코 연속 소둔로의 서냉대 가열 장치

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5665942A (en) * 1979-10-31 1981-06-04 Kawasaki Steel Corp Continuous annealing furnace for hoop
JPS56163224A (en) * 1980-05-16 1981-12-15 Nippon Steel Corp Tension controller for metalllic strip
JPS5943979B2 (ja) * 1979-10-31 1984-10-25 川崎製鉄株式会社 炉内張力制御方法
JPH03173721A (ja) * 1989-11-30 1991-07-29 Toshiba Corp 連続熱処理炉内のストリップ張力制御装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA948530A (en) * 1969-12-30 1974-06-04 Bunichiro Kawasaki Method and apparatus for producing low carbon cold-rolled steel
US4296919A (en) * 1980-08-13 1981-10-27 Nippon Steel Corporation Apparatus for continuously producing a high strength dual-phase steel strip or sheet

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5665942A (en) * 1979-10-31 1981-06-04 Kawasaki Steel Corp Continuous annealing furnace for hoop
JPS5943979B2 (ja) * 1979-10-31 1984-10-25 川崎製鉄株式会社 炉内張力制御方法
JPS56163224A (en) * 1980-05-16 1981-12-15 Nippon Steel Corp Tension controller for metalllic strip
JPH03173721A (ja) * 1989-11-30 1991-07-29 Toshiba Corp 連続熱処理炉内のストリップ張力制御装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP0613958A4 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006077301A (ja) * 2004-09-10 2006-03-23 Nippon Steel Corp 鋼板のフラッタリング抑制方法
JP4495553B2 (ja) * 2004-09-10 2010-07-07 新日本製鐵株式会社 鋼板のフラッタリング抑制方法

Also Published As

Publication number Publication date
JP3203581B2 (ja) 2001-08-27
DE69329272D1 (de) 2000-09-28
EP0613958A1 (fr) 1994-09-07
CN1028880C (zh) 1995-06-14
KR960006583B1 (ko) 1996-05-20
DE69329272T2 (de) 2001-02-08
EP0613958A4 (en) 1996-10-23
EP0613958B1 (fr) 2000-08-23
CN1080661A (zh) 1994-01-12
KR940701456A (ko) 1994-05-28

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