JP3156108B2 - Continuous annealing method for cold rolled steel sheet - Google Patents
Continuous annealing method for cold rolled steel sheetInfo
- Publication number
- JP3156108B2 JP3156108B2 JP30444992A JP30444992A JP3156108B2 JP 3156108 B2 JP3156108 B2 JP 3156108B2 JP 30444992 A JP30444992 A JP 30444992A JP 30444992 A JP30444992 A JP 30444992A JP 3156108 B2 JP3156108 B2 JP 3156108B2
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- rolled steel
- cold
- continuous annealing
- annealing method
- 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.)
- Expired - Fee Related
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- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、冷延鋼板の連続焼鈍方
法に関する。The present invention relates to a continuous annealing method for cold-rolled steel sheets.
【０００２】[0002]
【従来の技術】冷間圧延された鋼板は繊維状組織を呈し
ており、加工性に乏しい。そのため、焼鈍により回復、
再結晶、粒成長させ、加工性を改善する必要がある。特
に、連続焼鈍は、コイル焼鈍に比較すると、連続するス
トリップに対して均一な処理が可能になって均質な材質
を得ることができ、処理時間が短く、工程日数を大幅短
縮することができる等の点で優れている。2. Description of the Related Art Cold rolled steel sheets have a fibrous structure and are poor in workability. Therefore, recovery by annealing,
It is necessary to improve the workability by recrystallization and grain growth. In particular, continuous annealing makes it possible to perform uniform treatment on a continuous strip and obtain a homogeneous material, as compared with coil annealing, so that the treatment time is short and the number of process days can be significantly reduced. Excellent in terms of.
【０００３】ところで、連続焼鈍のためには、帯状で搬
送される鋼板を再結晶温度以上まで連続的に加熱し、そ
の後連続的に冷却する必要がある。[0003] For continuous annealing, it is necessary to continuously heat a steel sheet conveyed in a belt shape to a recrystallization temperature or higher, and then to continuously cool it.
【０００４】加熱方法としては、直火型無酸化加熱、輻
射管加熱、間接電気加熱などがあるが、表面が酸化して
しまったり、加熱能力が不十分で急速加熱できない等の
問題がある。そこで、これらの問題を解決する方法とし
て、特公昭６０−２６８１８号公報には、鋼板に通電ロ
ールを介して直接通電し、鋼板自体を発熱体として高温
化する方法が記載されている。また、特開平１−１４２
０３２号公報、特開平１−１８７７８９号公報には、環
状トランスを貫通する金属帯通路の前後に通電ロールを
設け、両通電ロールを導電性部材で接続して金属帯、通
電ロールおよび導電性部材により閉回路を構成し、環状
トランスに外部電源から交流電流を通電することにより
上記閉回路を二次コイルとして誘導電流を発生させ、こ
の誘導電流によるジュール熱で金属帯を加熱する方法が
記載されている。[0004] Examples of the heating method include direct fire type non-oxidizing heating, radiation tube heating, indirect electric heating, and the like. However, there are problems such as oxidation of the surface and insufficient heating capacity for rapid heating. As a method for solving these problems, Japanese Patent Publication No. 60-26818 discloses a method of directly energizing a steel sheet via an energizing roll to raise the temperature of the steel sheet itself as a heating element. Also, JP-A-1-142
No. 032 and Japanese Patent Application Laid-Open No. 1-187789 disclose energizing rolls provided before and after a metal band passage penetrating an annular transformer, and connecting both energizing rolls with a conductive member to form a metal band, an energizing roll and a conductive member. A method is described in which a closed circuit is formed by applying an alternating current from an external power supply to an annular transformer to generate an induced current using the closed circuit as a secondary coil, and heating the metal strip with Joule heat by the induced current. ing.
【０００５】一方、冷却方法としては、ガス噴流冷却、
ミスト冷却、ロール接触冷却等がある。しかし、ミスト
冷却は表面品質、温度制御性に問題があり、ロール接触
冷却は温度制御性に問題がある。ガス噴流冷却はこれら
の問題点は解決できるが、０．６ｍｍ以上の厚板材に対
しては能力不足である。そこで、特公昭５５−１９６９
号公報には、Ｈ2 濃度が５０％以上の保護ガスをガスジ
ェットとして走行ストリップに吹き付ける方法が記載さ
れており、この冷却方法によれば鋼板の表面品質を劣化
させることなく、温度制御性よく急速冷却することが可
能であるとされている。On the other hand, cooling methods include gas jet cooling,
Mist cooling, roll contact cooling, etc. However, mist cooling has problems in surface quality and temperature controllability, and roll contact cooling has problems in temperature controllability. Although gas jet cooling can solve these problems, it is insufficient for thick plates of 0.6 mm or more. Therefore, Japanese Patent Publication No. 55-1969
Japanese Patent Application Laid-Open Publication No. H11-146,086 describes a method in which a protective gas having an H 2 concentration of 50% or more is sprayed as a gas jet onto a traveling strip. According to this cooling method, the temperature controllability is improved without deteriorating the surface quality of the steel sheet. It is said that rapid cooling is possible.
【０００６】[0006]
【発明が解決しようとする課題】近年、品質向上、設備
投資削減を狙ったコンパクトな連続焼鈍技術開発のニー
ズが高まっているが、本発明はこのニーズに対応するた
め、無酸化で制御性良好な急速加熱・冷却の可能な鋼板
の連続焼鈍方法を提供することを目的とする。In recent years, there has been an increasing need for the development of a compact continuous annealing technique aimed at improving quality and reducing capital investment. However, in order to meet this need, the present invention is non-oxidizing and has good controllability. It is an object of the present invention to provide a continuous annealing method for a steel sheet capable of rapid heating and cooling.
【０００７】[0007]
【課題を解決するための手段】本発明の要旨は、通電ロ
ールを介して冷延鋼板に電流を流し、ジュール熱により
冷延鋼板を急速加熱した直後、Ｈ2を含む無酸化ガスに
より噴流急速冷却することを特徴とする冷延鋼板の連続
焼鈍方法である。通電方法としては、外部電源より通電
する方法の他、冷延鋼板を環状トランス内を貫通させ、
環状トランスに交流電流を通して冷延鋼板に誘導電流を
発生させることにより通電する方法も採用できる。冷却
能力は、噴流ガス速度を調整することにより制御できる
他、Ｈ2濃度により制御することも可能である。また、
加熱装置および冷却装置における鋼板の通板方向は、そ
れぞれ横パスまたは縦パスから選択することとする。SUMMARY OF THE INVENTION The means for solving the problem] allows a current to flow cold-rolled steel sheet through the conductive rolls, immediately after that was rapidly heated cold-rolled steel sheet by Joule heat, the jet by an oxidizing gas containing H 2 This is a method for continuously annealing cold-rolled steel sheets, characterized by rapid cooling. As an energizing method, besides a method of energizing from an external power supply, a cold-rolled steel sheet is passed through the annular transformer,
It is also possible to adopt a method in which an alternating current is passed through an annular transformer to generate an induced current in the cold-rolled steel sheet, thereby conducting the current. The cooling capacity can be controlled by adjusting the jet gas velocity, and can also be controlled by the H 2 concentration. Also,
The passing direction of the steel sheet in the heating device and the cooling device is selected from a horizontal pass or a vertical pass, respectively.
【０００８】[0008]
【作用】本発明においては、まず、加熱方法として、鋼
板自体に電流を通し、鋼板自体のジュール熱を利用して
加熱する通電加熱方法を採用する。従来の他の加熱方法
は、鋼板以外の発熱体を用いて発熱させ、その熱を鋼板
に伝達するものであるため、鋼板自体を発熱させる場合
に比べて低効率となることは避けられず、また、雰囲気
温度も必然的に高くなるため、耐火物を厚くする等によ
り加熱装置の炉体容量が大きくなり、温度制御性も低下
する。これに対し、通電加熱方法では鋼板自体が発熱体
となるため効率が良く、雰囲気温度を上げる必要がな
い。さらに、通電加熱方法では、電流値を調整すること
により加熱能力を容易に制御することができ、４０Ａ／
ｍｍ以上の電流を通して７００〜９００℃の高温まで１
０００℃／秒の超急速加熱することも可能である。この
ように、通電加熱方法を採用することにより、コンパク
トな装置で加熱能力が大きく、しかも制御性の良い加熱
が可能となる。In the present invention, first, as a heating method, an electric current heating method in which an electric current is passed through the steel sheet itself and the steel sheet itself is heated using Joule heat is adopted. Since other conventional heating methods generate heat using a heating element other than the steel sheet and transfer the heat to the steel sheet, it is inevitable that the efficiency becomes lower than when the steel sheet itself is heated, Also, since the ambient temperature is inevitably high, the furnace capacity of the heating device is increased by increasing the thickness of the refractory, and the temperature controllability is also reduced. On the other hand, in the electric heating method, since the steel sheet itself becomes a heating element, the efficiency is high, and it is not necessary to raise the ambient temperature. Further, in the energization heating method, the heating capacity can be easily controlled by adjusting the current value, and the heating current can be controlled to 40 A /
mm to a high temperature of 700 to 900 ° C through a current of 1 mm or more.
Ultra-rapid heating at 000 ° C./sec is also possible. As described above, by employing the energization heating method, it is possible to perform heating with high controllability and high controllability in a compact device.
【０００９】なお、通電方法としては、通電ロールを介
して外部電源から直流または交流電流を供給する外部電
源方式の通電方法だけでなく、冷延鋼板が環状トランス
を貫通するようにし、環状トランスに交流電流を通して
冷延鋼板に誘導電流を発生させる方式の通電方法を採用
することも可能である。The current supply method is not limited to an external power supply method for supplying a direct current or an alternating current from an external power supply via a current supply roll, but also allows a cold rolled steel sheet to pass through the annular transformer. It is also possible to employ an energization method of generating an induced current in a cold-rolled steel sheet through an alternating current.
【００１０】次に、本発明では、加熱した鋼板表面にＨ
2 を含む無酸化ガスの噴流を吹き付けることにより冷却
する。無酸化ガスを用いるのは、鋼板表面が酸化するの
を防止するためで、たとえば窒素ガスが用いられる。Ｈ
2 を含ませるのは冷却能力を向上させるためであり、Ｈ
2 濃度が高くなるほど冷却能力も向上する。したがっ
て、Ｈ2 濃度を調整することにより冷却能力を制御する
ことができる。また、噴流ガスを鋼板表面に吹き付ける
速度が速いほど冷却能力が向上するので、噴流ガス速度
を調整することにより冷却能力を制御することも可能で
ある。Ｈ2 濃度と噴流ガス速度との調整により、３００
℃／秒という急速冷却も可能となる。Next, according to the present invention, H
Cooling is performed by blowing a jet of a non-oxidizing gas containing 2 . The non-oxidizing gas is used to prevent oxidation of the steel sheet surface, and for example, nitrogen gas is used. H
2 is included to improve the cooling capacity.
About 2 concentration becomes higher to increase the cooling capacity. Therefore, the cooling capacity can be controlled by adjusting the H 2 concentration. In addition, since the cooling capacity is improved as the speed at which the jet gas is blown onto the steel sheet surface increases, the cooling capacity can be controlled by adjusting the jet gas velocity. By adjusting the H 2 concentration and the jet gas velocity, 300
Rapid cooling of ° C / sec is also possible.
【００１１】本発明を実施するための装置の例を図１〜
３に示す。An example of an apparatus for carrying out the present invention is shown in FIGS.
3 is shown.
【００１２】図示した装置は、環状トランス５を用いて
冷延鋼板３に誘導電流を発生させる場合の例であり、通
電ロール４ａ、４ｂ間は導電性部材６で接続してある。
外部電源方式で通電する場合は環状トランス５を除去
し、通電ロール４ａ、４ｂ間に外部電源を接続すればよ
い。The illustrated device is an example in which an induction current is generated in the cold-rolled steel sheet 3 using the annular transformer 5, and the conductive rolls 4a and 4b are connected by a conductive member 6.
When power is supplied by the external power supply method, the annular transformer 5 may be removed and an external power supply may be connected between the power supply rolls 4a and 4b.
【００１３】ガス噴流冷却装置２の内部はＮ2 ＋Ｈ2 の
ような無酸化ガスの雰囲気としておき、冷延鋼板表面の
酸化を防止する。そして、雰囲気ガスを吸引し、熱交換
器９で冷却した後、ブロワー１０で圧力を所望の冷却能
力となる噴流ガス速度が得られるように調整し、ガス吹
付装置８から冷延鋼板３の表面に噴流として吹付ける。
ガス中のＨ2 濃度はＨ2 濃度測定器１１により測定し、
所望の冷却能力に応じてバルブ１２を開閉して調整す
る。The interior of the gas jet cooling device 2 is kept in an atmosphere of a non-oxidizing gas such as N 2 + H 2 to prevent oxidation of the surface of the cold-rolled steel sheet. Then, after the atmosphere gas is sucked and cooled by the heat exchanger 9, the pressure is adjusted by the blower 10 so as to obtain a jet gas velocity which has a desired cooling capacity, and the surface of the cold-rolled steel sheet 3 is supplied from the gas spraying device 8. Spray as a jet.
The H 2 concentration in the gas is measured by the H 2 concentration measuring device 11,
The valve 12 is opened and closed for adjustment according to the desired cooling capacity.
【００１４】通電加熱装置１は非常にコンパクトであ
り、また雰囲気温度を上げる必要がないため、図１〜３
に示すように炉殻７を通電加熱装置１とガス噴流冷却装
置２とに共通のものとすることができる。そして、ガス
噴流冷却装置２の雰囲気ガスを通電加熱装置１へも導入
し、無酸化雰囲気で加熱することができる。The electric heating device 1 is very compact and does not need to raise the ambient temperature.
As shown in (1), the furnace shell 7 can be common to the electric heating device 1 and the gas jet cooling device 2. Then, the atmosphere gas of the gas jet cooling device 2 is also introduced into the electric heating device 1 so that the gas can be heated in a non-oxidizing atmosphere.
【００１５】また、本発明方法は通電加熱装置１および
ガス噴流冷却装置２が非常にコンパクトになるため、鋼
板の通板方向として横パスまたは縦パスのいずれを採用
することも可能となる。すなわち、加熱装置および冷却
装置における通板方向としては、横パス＋横パス、
横パス＋縦パス、縦パス＋縦パス、縦パス＋横パス
の四通りの組合せが採用可能であり、このうち〜を
図１〜３に示した。Further, in the method of the present invention, since the electric heating device 1 and the gas jet cooling device 2 are very compact, it is possible to employ either a horizontal path or a vertical path as the direction in which the steel sheet passes. That is, as the passing direction in the heating device and the cooling device, a horizontal path + a horizontal path,
Four combinations of a horizontal path + a vertical path, a vertical path + a vertical path, and a vertical path + a horizontal path can be adopted.
【００１６】[0016]
【実施例】板厚０．３ｍｍ、板幅３００ｍｍのＴ６相当
のブリキ用鋼板を、図１に示した装置を用いて本発明方
法により連続焼鈍した。その結果、従来の輻射管加熱と
低速ガス冷却による比較例と比べて焼鈍時間を１／２０
以下に低減することができた。このときの焼鈍温度サイ
クルを図４に示す。EXAMPLE A T6 equivalent tin plate steel plate having a thickness of 0.3 mm and a width of 300 mm was continuously annealed by the method of the present invention using the apparatus shown in FIG. As a result, the annealing time was reduced to 1/20 of that of the comparative example using the conventional radiation tube heating and low-speed gas cooling.
The following was able to be reduced. FIG. 4 shows the annealing temperature cycle at this time.
【００１７】[0017]
【発明の効果】本発明により、非常にコンパクトな連続
焼鈍が可能となる。また、制御能力が高く熱応答性が良
いため、板厚、板幅、焼鈍温度等の条件変更の際の通板
スケジュール制約も解消できる。According to the present invention, very compact continuous annealing can be performed. Further, since the control ability is high and the thermal responsiveness is good, it is possible to eliminate the restriction on the passing of the sheet when changing the conditions such as the sheet thickness, the sheet width, and the annealing temperature.
【図１】本発明を実施するための装置の例を示す図であ
る。FIG. 1 is a diagram showing an example of an apparatus for implementing the present invention.
【図２】本発明を実施するための装置の他の例を示す図
である。FIG. 2 is a diagram showing another example of an apparatus for implementing the present invention.
【図３】本発明を実施するための装置の他の例を示す図
である。FIG. 3 is a diagram showing another example of an apparatus for implementing the present invention.
【図４】連続焼鈍時の温度サイクルを示す図である。FIG. 4 is a diagram showing a temperature cycle during continuous annealing.
１ 通電加熱装置 ２ ガス噴流冷却装置 ３ 冷延鋼板 ４ａ、４ｂ 通電ロール ５ 環状トランス ６ 導電性部材 ７ 炉殻 ８ ガス吹付装置 ９ 熱交換器 １０ ブロワー １１ Ｈ2 濃度測定器 １２ バルブ1 resistance heating apparatus 2 gas jet cooling device 3 cold-rolled steel sheet 4a, 4b conductive rolls 5 annular transformer 6 conductive members 7 furnace shell 8 Gas blowing apparatus 9 heat exchanger 10 blower 11 H 2 concentration measuring device 12 valve
───────────────────────────────────────────────────── フロントページの続き (72)発明者 森 晋一郎 兵庫県姫路市広畑区富士町１ 新日本製 鐵株式会社 広畑製鐵所内 (72)発明者 松岡 英雄 兵庫県姫路市広畑区富士町１ 新日本製 鐵株式会社 広畑製鐵所内 (56)参考文献 特開 平２−243725（ＪＰ，Ａ) 特開 平１−142032（ＪＰ，Ａ) 特開 平５−74553（ＪＰ，Ａ) 特公 昭55−1969（ＪＰ，Ｂ２) (58)調査した分野(Int.Cl.7，ＤＢ名) C21D 1/40,9/46,9/48 C21D 9/56,9/62 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shinichiro Mori 1 Fujimachi, Hirohata-ku, Himeji City, Hyogo Prefecture Nippon Steel Corporation Hirohata Works (72) Inventor Hideo Matsuoka 1 Fujimachi, Hirohata-ku, Himeji City, Hyogo Prefecture Nippon Steel Corporation Hirohata Works (56) References JP-A-2-243725 (JP, A) JP-A-1-142032 (JP, A) JP-A-5-74553 (JP, A) 55-1969 (JP, B2) (58) Fields studied (Int. Cl. 7 , DB name) C21D 1/40, 9/46, 9/48 C21D 9/56, 9/62
Claims (6)
し、ジュール熱により冷延鋼板を急速加熱した直後、Ｈ
2を含む無酸化ガスにより噴流急速冷却することを特徴
とする冷延鋼板の連続焼鈍方法。1. A current flows to the cold-rolled steel sheet through the conductive rolls, immediately after that was rapidly heated cold-rolled steel sheet by Joule heat, H
A continuous annealing method for a cold-rolled steel sheet, wherein the jet is rapidly cooled by a non-oxidizing gas containing 2 .
延鋼板の連続焼鈍方法。2. The continuous annealing method for a cold-rolled steel sheet according to claim 1, wherein electricity is supplied from an external power supply.
環状トランスに交流電流を通して冷延鋼板に誘導電流を
発生させることにより通電する請求項１記載の冷延鋼板
の連続焼鈍方法。3. A cold rolled steel sheet is passed through an annular transformer.
The continuous annealing method for a cold-rolled steel sheet according to claim 1, wherein the current is supplied by generating an induced current in the cold-rolled steel sheet by passing an alternating current through the annular transformer.
請求項１〜３のいずれか記載の冷延鋼板の連続焼鈍方
法。4. The continuous annealing method for a cold-rolled steel sheet according to claim 1, wherein the cooling capacity is controlled by a jet gas velocity.
項１〜４のいずれか記載の冷延鋼板の連続焼鈍方法。5. The continuous annealing method for a cold-rolled steel sheet according to claim 1, wherein the cooling capacity is controlled by the H 2 concentration.
通板方向をそれぞれ横パスまたは縦パスから選択する請
求項１〜５のいずれか記載の冷延鋼板の連続焼鈍方法。6. The continuous annealing method for a cold-rolled steel sheet according to claim 1, wherein a passing direction of the steel sheet in the heating device and the cooling device is selected from a horizontal pass and a vertical pass, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30444992A JP3156108B2 (en) | 1992-10-19 | 1992-10-19 | Continuous annealing method for cold rolled steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30444992A JP3156108B2 (en) | 1992-10-19 | 1992-10-19 | Continuous annealing method for cold rolled steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06128650A JPH06128650A (en) | 1994-05-10 |
| JP3156108B2 true JP3156108B2 (en) | 2001-04-16 |
Family
ID=17933149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30444992A Expired - Fee Related JP3156108B2 (en) | 1992-10-19 | 1992-10-19 | Continuous annealing method for cold rolled steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3156108B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100758488B1 (en) * | 2006-06-30 | 2007-09-12 | 주식회사 포스코 | Apparatus and method for controlling cooling blower speed in bright annealing line |
| KR100963065B1 (en) * | 2008-03-20 | 2010-06-14 | 주식회사 포스코 | GA induction heater controller Cooling System and controller method |
| KR100963064B1 (en) * | 2008-03-31 | 2010-06-14 | 주식회사 포스코 | Cooling bend plate cooling pattern controller system |
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1992
- 1992-10-19 JP JP30444992A patent/JP3156108B2/en not_active Expired - Fee Related
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| JPH06128650A (en) | 1994-05-10 |
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