JPH07278680A - Continuous annealing equipment for steel sheet - Google Patents

Continuous annealing equipment for steel sheet

Info

Publication number
JPH07278680A
JPH07278680A JP9071994A JP9071994A JPH07278680A JP H07278680 A JPH07278680 A JP H07278680A JP 9071994 A JP9071994 A JP 9071994A JP 9071994 A JP9071994 A JP 9071994A JP H07278680 A JPH07278680 A JP H07278680A
Authority
JP
Japan
Prior art keywords
zone
heating
steel sheet
overaging
continuous annealing
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.)
Withdrawn
Application number
JP9071994A
Other languages
Japanese (ja)
Inventor
Masami Onoda
正巳 小野田
Kazuo Koyama
一夫 小山
Hiroyuki Uchida
裕之 内田
Yoshio Saito
芳夫 斉藤
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.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
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 Corp filed Critical Nippon Steel Corp
Priority to JP9071994A priority Critical patent/JPH07278680A/en
Publication of JPH07278680A publication Critical patent/JPH07278680A/en
Withdrawn legal-status Critical Current

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Abstract

PURPOSE:To enable small-quantity production of many kinds by suppressing extreme lengthening of continuous annealing equipment for steel sheets and decreasing thermal inertia. CONSTITUTION:Electrical heating is adopted for a heating zone 2 to intensity a heating ability and to decrease the thermal inertia. A coil box 6 is adopted for an overaging zone to avoid extreme lengthening of this overaging zone and to execute an overaging treatment by each coil. As a result, the equipment is made compact and simultaneously, the thermal inertia is decreased. Changing of conditions, such as heating rate and cooling rate, is facilitated. Since changing of the conditions for the averaging by each coil is possible, the small-quantity production of many kinds is enabled.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は鋼板の連続焼鈍設備に関
する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to continuous annealing equipment for 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、連続する鋼
板に対して均一な処理が可能になって均質な材料を得る
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 recrystallize and grow grains to improve workability. In particular, compared with coil annealing, continuous annealing makes it possible to perform a uniform treatment on continuous steel sheets, obtain a homogeneous material, shorten the treatment time, and significantly reduce the number of process days, etc. Is excellent in terms of.

【0003】一般に、鋼板の連続焼鈍設備は図2に示す
ように入側から加熱帯2、均熱帯3、冷却帯4、過時効
帯12および二次冷却帯13が設けられ、各帯域に設け
られたハースロール14を介して鋼板1を搬送し連続焼
鈍する。
Generally, a continuous annealing equipment for steel sheets is provided with a heating zone 2, a soaking zone 3, a cooling zone 4, an overaging zone 12 and a secondary cooling zone 13 from the inlet side as shown in FIG. The steel sheet 1 is conveyed through the formed hearth roll 14 and continuously annealed.

【0004】加熱帯の加熱方式には直火型無酸化加熱、
輻射管加熱等が、均熱帯の加熱方式には輻射管加熱、間
接電気加熱等が、また冷却帯ではロール接触冷却、ガス
ジェット冷却、ミスト冷却等が一般に用いられている。
更に過時効帯は鋼板を300〜400℃に3分間程度保
持するための炉で、長大な炉殻内に電気ヒーターが設け
られている。そして、絞り用鋼板や高張力鋼板等の品質
に応じた焼鈍条件を満足させるように設備構成がなされ
ている。
Direct heating type non-oxidizing heating is used for heating the heating zone.
Radiant tube heating and the like are generally used in a soaking zone heating method, and radiant tube heating, indirect electric heating and the like, and roll contact cooling, gas jet cooling, mist cooling and the like are generally used in the cooling zone.
Further, the overaging zone is a furnace for holding the steel sheet at 300 to 400 ° C. for about 3 minutes, and an electric heater is provided in a long furnace shell. The equipment is configured so as to satisfy the annealing conditions according to the quality of the drawing steel plate, the high-tensile steel plate and the like.

【0005】[0005]

【発明が解決しようとする課題】鋼板の連続焼鈍は前述
のような利点を有するものではあるが、設備が長大化す
ることは避けられなかった。たとえば、加熱帯に最も一
般的な輻射管加熱方式を用いた場合、全鋼板長の30%
が加熱帯、50%が過時効帯となり、その結果、連続焼
鈍炉内の鋼板全長が2000mを越えるような大規模な
ものもある。加熱方式の一部を直火型無酸化加熱方式に
することにより、加熱帯を最大半分程度までコンパクト
化することが可能であるが、それでも長大な加熱設備で
あることには変わりない。一方、過時効帯は鋼板中に高
価なTi、Nb等を加えてC、Nを無害化できる成分設
計をすることにより省略できるが、通常の成分系では過
時効処理に要する時間が決まってしまうため、連続焼鈍
における過時効帯を短縮することは極めて困難である。
Although continuous annealing of steel sheets has the advantages as described above, it is inevitable that the equipment will be lengthened. For example, if the most common radiant tube heating method is used for the heating zone, 30% of the total steel plate length
Is a heating zone and 50% is an overaging zone, and as a result, there is a large-scale one in which the total length of the steel plate in the continuous annealing furnace exceeds 2000 m. Although it is possible to make the heating zone compact up to about half by using a direct-fire non-oxidizing heating method as a part of the heating method, it is still a long heating facility. On the other hand, the overaging zone can be omitted by designing a component that can render C and N harmless by adding expensive Ti, Nb, etc. to the steel sheet, but the time required for overaging treatment is determined in the ordinary component system. Therefore, it is extremely difficult to shorten the overaging zone in continuous annealing.

【0006】このように設備が長大化すると設備投資額
が莫大になり、立地に広大な面積が必要となるだけでな
く、設備の熱慣性がきわめて大きくなってしまう問題が
ある。そして、熱慣性が大きくなると加熱温度等の条件
設定を変更するのが困難となり、同一焼鈍条件で大量生
産する場合には問題ないが、頻繁に焼鈍条件を変更する
必要のある多品種少量生産は不可能となる。
[0006] In this way, if the equipment is lengthened, the amount of equipment investment becomes enormous, not only a vast area is required for the location, but also the thermal inertia of the equipment becomes extremely large. And when the thermal inertia becomes large, it becomes difficult to change the condition settings such as heating temperature, and there is no problem in mass production under the same annealing conditions, but it is necessary to change the annealing conditions frequently for high-mix low-volume production. It will be impossible.

【0007】そこで本発明は、連続焼鈍設備の長大化を
避けると同時に熱慣性を小さくし、多品種少量生産可能
な連続焼鈍設備を提供することを目的とする。
[0007] Therefore, an object of the present invention is to provide a continuous annealing equipment capable of avoiding the lengthening of the continuous annealing equipment and at the same time reducing the thermal inertia and capable of producing a wide variety of products in small quantities.

【0008】[0008]

【課題を解決するための手段】本発明は、加熱帯、均熱
帯、冷却帯および過時効帯を含む鋼板の連続焼鈍設備に
おいて、加熱帯に通電加熱を、過時効帯にコイルボック
スを採用したことを特徴とする鋼板の連続焼鈍設備であ
る。さらに、均熱帯にも通電加熱を採用することは好ま
しい。
According to the present invention, in a continuous annealing equipment for a steel sheet including a heating zone, a soaking zone, a cooling zone and an overaging zone, an electric heating is used for the heating zone and a coil box is used for the overaging zone. This is a continuous annealing equipment for steel plates, which is characterized in that Furthermore, it is preferable to apply electric heating to the soaking zone.

【0009】[0009]

【作用】本発明では、加熱帯に通電加熱を採用する。通
電加熱とは、通電ロールを介して鋼板に電流を通し、鋼
板自体のジュール熱により鋼板を加熱するものであり、
特公昭60−26818号公報記載のように、外部電源
から鋼板に直接通電する方式のものと、特開平1−14
2032号公報、特開平1−187789号公報記載の
ように、環状トランスを貫通する鋼板の前後に通電ロー
ルを設け、両通電ロールを導電性部材で接続して鋼板、
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鋼板を加熱する変圧器
型通電加熱方式のものとがあるが、本発明ではいずれも
採用可能である。
In the present invention, electric heating is used for the heating zone. The energization heating is to pass an electric current through the steel sheet through an energizing roll and heat the steel sheet by Joule heat of the steel sheet itself.
As disclosed in Japanese Patent Publication No. 60-26818, a method of directly energizing a steel plate from an external power source, and JP-A-1-14
As described in JP-A-2032 and JP-A-1-187789, a steel plate is provided in front of and behind a steel plate penetrating the annular transformer, and the two conductive rolls are connected by a conductive member.
A closed circuit is configured by a current-carrying roll and a conductive member, and an induction current is generated by using the closed circuit as a secondary coil by passing an alternating current from an external power source to the annular transformer,
There is a transformer type electric heating method of heating a steel sheet by Joule heat by this induced current, but any of them can be adopted in the present invention.

【0010】通電加熱は伝熱による加熱ではなく、鋼板
自体に電流を流してそのジュール熱を利用して加熱する
ものであり、加熱速度は電流値を調整することにより容
易に制御できる。また、加熱能力も大きく、たとえば4
0A/mm以上の電流を通して700〜900℃の高温
まで1000℃/秒の超急速加熱することさえ可能であ
り、設備の長大化を避けることができる。さらに、鋼板
自体が発熱するため、炉殻に厚い煉瓦を用いる必要もな
く、炉の熱慣性が小さくなって加熱温度、加熱速度等の
条件変更が容易となる。
The energization heating is not heating by heat transfer but heating by applying an electric current to the steel sheet itself and utilizing its Joule heat, and the heating rate can be easily controlled by adjusting the current value. Also, the heating capacity is large, for example, 4
It is even possible to heat ultra-rapidly at 1000 ° C./sec to a high temperature of 700 to 900 ° C. by passing a current of 0 A / mm or more, and it is possible to avoid lengthening the equipment. Furthermore, since the steel plate itself generates heat, it is not necessary to use thick bricks for the furnace shell, and the thermal inertia of the furnace is reduced, and it becomes easy to change the conditions such as heating temperature and heating rate.

【0011】そして、過時効帯としてはコイルボックス
を採用する。これは従来のコイル焼鈍のように焼鈍全体
をコイルとして行うわけではなく、加熱、均熱、冷却に
ついては連続焼鈍の利点を生かしつつ、過時効処理だけ
をコイルとして行うものである。これにより、絞り用鋼
板のように長時間の過時効処理が必要な場合にも、過時
効帯の長大化の問題は生じない。
A coil box is used as the over-aging zone. This does not perform the entire annealing as a coil like the conventional coil annealing, but performs the overaging treatment only as a coil while taking advantage of the continuous annealing for heating, soaking, and cooling. As a result, the problem of lengthening the overaging zone does not occur even when long-term overaging treatment is required as in the case of drawing steel sheets.

【0012】なお、冷却装置にミスト冷却を用いた場合
には鋼板表面が酸化するので、コイルボックスを特に無
酸化雰囲気にする必要はなく、大気雰囲気で構わない。
必要に応じて、その後酸洗処理を施せばよい。
When the mist cooling is used for the cooling device, the surface of the steel sheet is oxidized, so that it is not necessary to make the coil box a non-oxidizing atmosphere, and an air atmosphere may be used.
If necessary, a pickling treatment may be performed thereafter.

【0013】以上のように、本発明は加熱帯の加熱能力
を強力にして設備をコンパクトにするとともに熱慣性を
小さくし、コイルボックスによる過時効を採用すること
により過時効帯の長大化を避けてコイル毎に過時効処理
を行うようにする。すなわち、加熱帯、冷却帯の熱慣性
を小さく抑えることにより、加熱条件、冷却条件の変更
が容易になり、コイルボックスの採用により、コイル毎
に過時効条件を変更することが可能となる。これによ
り、従来の長大な連続焼鈍設備では対応不可能であった
多品種少量生産の需要にも応じることが可能となる。
As described above, according to the present invention, the heating capacity of the heating zone is strengthened to make the equipment compact, the thermal inertia is reduced, and the overageing by the coil box is adopted to prevent the overaging zone from being lengthened. The coil is over-aged. That is, by suppressing the thermal inertia of the heating zone and the cooling zone to be small, it becomes easy to change the heating condition and the cooling condition, and the adoption of the coil box makes it possible to change the overaging condition for each coil. As a result, it becomes possible to meet the demand for high-mix low-volume production, which was not possible with conventional long continuous annealing equipment.

【0014】さらに、均熱帯にも通電加熱を採用すれ
ば、雰囲気を制御しながらの均熱も可能となる。これに
より、均熱処理と同時に窒化や浸炭処理することもでき
る。
Further, if electric heating is adopted even in the soaking zone, soaking can be performed while controlling the atmosphere. Thereby, nitriding or carburizing can be performed simultaneously with the soaking.

【0015】[0015]

【実施例】図1に本発明の鋼板の連続焼鈍設備の一実施
例を示す。
EXAMPLE FIG. 1 shows an example of the continuous annealing equipment for steel sheets of the present invention.

【0016】冷間圧延工程を経てコイル状に巻き取られ
た鋼板1を連続的に送り出して加熱帯2に装入する。加
熱帯2には、通電ロール7、8を介して鋼板1に電流を
流してジュール熱により加熱する通電加熱装置を採用し
ている。加熱帯2でたとえば900℃まで200℃/秒
のように急速加熱された鋼板1は引き続き均熱帯3で均
熱処理される。この例では、均熱帯3にも通電ロール
9、10を配置し、通電加熱による均熱を行う。ここ
で、NH3 ガスやCOガスにより窒化や浸炭処理を行う
こともできる。次に、鋼板1は冷却帯4で水スプレーの
ようなミスト冷却装置11によりたとえば60℃/秒以
上で急速冷却される。その後、鋼板1は再加熱帯5を経
てコイルボックス6でコイル状に巻き取られ、たとえば
400℃×3分間過時効処理される。これらの処理を終
えた鋼板は必要に応じて表面酸化膜を除去するため酸洗
工程へ送られる。
A steel sheet 1 wound into a coil through a cold rolling process is continuously fed out and charged into a heating zone 2. The heating zone 2 employs an energization heating device that applies current to the steel sheet 1 via the energization rolls 7 and 8 to heat it by Joule heat. The steel sheet 1 that has been rapidly heated to 900 ° C. at 200 ° C./sec in the heating zone 2 is subsequently subjected to soaking in the soaking zone 3. In this example, the energizing rolls 9 and 10 are also arranged in the soaking zone 3 to perform soaking by energization heating. Here, nitriding or carburizing treatment can be performed with NH 3 gas or CO gas. Next, the steel sheet 1 is rapidly cooled in the cooling zone 4 by a mist cooling device 11 such as a water spray at, for example, 60 ° C./sec or more. Then, the steel sheet 1 is wound into a coil shape in the coil box 6 through the reheating zone 5 and is overaged at 400 ° C. for 3 minutes, for example. The steel sheet that has been subjected to these treatments is sent to a pickling step to remove the surface oxide film, if necessary.

【0017】[0017]

【発明の効果】本発明の連続焼鈍設備は、設備がコンパ
クトになると同時に熱慣性が小さくなり、加熱速度や冷
却速度の変更が容易となるばかりでなく、過時効処理も
コイル毎に条件を変更できるため、多品種少量生産が可
能となる。
EFFECTS OF THE INVENTION The continuous annealing equipment of the present invention not only makes the equipment compact but also reduces the thermal inertia, making it easy to change the heating rate and cooling rate and changing the conditions for overaging treatment for each coil. Therefore, high-mix low-volume production is possible.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の鋼板の連続焼鈍設備の一実施例を示す
図である。
FIG. 1 is a diagram showing an example of continuous annealing equipment for steel sheets of the present invention.

【図2】従来の鋼板の連続焼鈍設備を示す図である。FIG. 2 is a diagram showing a conventional continuous annealing equipment for steel plates.

【符号の説明】[Explanation of symbols]

1 鋼板 2 加熱帯 3 均熱帯 4 冷却帯 5 再加熱帯 6 コイルボックス 7 通電ロール 8 通電ロール 9 通電ロール 10 通電ロール 11 ミスト冷却装置 12 過時効帯 13 二次冷却帯 14 ハースロール 1 Steel Plate 2 Heating Zone 3 Soaking Zone 4 Cooling Zone 5 Reheating Zone 6 Coil Box 7 Energizing Roll 8 Energizing Roll 9 Energizing Roll 10 Energizing Roll 11 Mist Cooling Device 12 Overaging Zone 13 Secondary Cooling Zone 14 Hearth Roll

───────────────────────────────────────────────────── フロントページの続き (72)発明者 斉藤 芳夫 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 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshio Saito 1 Fuji-machi, Hirohata-ku, Himeji-shi, Hyogo Nippon Steel Works Hirohata Works Ltd.

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 加熱帯、均熱帯、冷却帯および過時効帯
を含む鋼板の連続焼鈍設備において、加熱帯に通電加熱
を、過時効帯にコイルボックスを採用したことを特徴と
する鋼板の連続焼鈍設備。
1. A continuous steel sheet annealing apparatus comprising a heating zone, a soaking zone, a cooling zone and an overaging zone, wherein the heating zone is electrically heated and the overaging zone is a coil box. Annealing equipment.
【請求項2】 均熱帯にも通電加熱を採用した請求項1
記載の鋼板の連続焼鈍設備。
2. The method according to claim 1, wherein electric heating is applied to the soaking zone.
Continuous annealing equipment for the steel sheet described.
JP9071994A 1994-04-06 1994-04-06 Continuous annealing equipment for steel sheet Withdrawn JPH07278680A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9071994A JPH07278680A (en) 1994-04-06 1994-04-06 Continuous annealing equipment for steel sheet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9071994A JPH07278680A (en) 1994-04-06 1994-04-06 Continuous annealing equipment for steel sheet

Publications (1)

Publication Number Publication Date
JPH07278680A true JPH07278680A (en) 1995-10-24

Family

ID=14006362

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9071994A Withdrawn JPH07278680A (en) 1994-04-06 1994-04-06 Continuous annealing equipment for steel sheet

Country Status (1)

Country Link
JP (1) JPH07278680A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015099402A1 (en) * 2013-12-25 2015-07-02 주식회사 포스코 Continuous annealing apparatus for strip and continuous annealing method for same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015099402A1 (en) * 2013-12-25 2015-07-02 주식회사 포스코 Continuous annealing apparatus for strip and continuous annealing method for same
CN105849289A (en) * 2013-12-25 2016-08-10 Posco公司 Apparatus for continuous annealing of strip and method for continuous annealing of same
US10358691B2 (en) 2013-12-25 2019-07-23 Posco Apparatus for continuous annealing of strip and method for continuous annealing of same
US10604820B2 (en) 2013-12-25 2020-03-31 Posco Method of continuously annealing a strip

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