JPS59222534A - Continuous annealing method of steel plate - Google Patents

Abstract

PURPOSE:To enable overaging treatment of steel plates for long time with a compact device by turning the transverse direction of the steel plate to a perpendicular direction by means of a helical turning device, superposing the same on steel plates for guiding and moving spirally the steel plates by means of guide roller groups. CONSTITUTION:Steel plates 1 delivered from a primary cooling furnace (not shown) are turned by a helical turning (HT) device 2 so as to make the transverse direction thereof perpendicular and are superposed on steel plates 3 for guiding which travel in the same direction at the same speed. Both plates which travel integrally are spirally moved from the outside circumference toward the inside circumference along the grooves 4a of guide roller groups 4 which are radially arranged and are driven by motors 8. The plates 3 on the innermost circumference are separated from the plates 1 and are passed successively through a deflector roll (DR)10, HT device 5, DRs 13, 14, HT device 6 and DR15 so that said plates are again returned to the outmost circumference. On the other hand, the plates 1 are passed successively through a DR11, HT device 16 and DR12 and the transverse direction thereof is again turned horizontal. The steel plates completed of the overaging are delivered to a succeeding secondary cooling furnace (not shown).

Description

【発明の詳細な説明】 本発明は鋼板の連続焼鈍方法にかかるもので、コンパク
トでかつ長時間の過１１！ｉ効処理を可能側こする方法
に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for continuous annealing of steel plates, which is compact and takes a long time. The present invention relates to a method of reducing i-effect processing to the possible side.

周知のように鋼板の連続焼鈍においては、冷間圧延後の
鋼板を７００〜８５０°Ｃ程匹の温度に加熱し、しかる
後約１分間均熱して再結晶せしめ、続いて約４００°Ｃ
まで急冷し鋼中の炭素を過飽和な状ｊ１８に至らしめる
。引き続き約４００°Ｃの炉中で２〜３分間過時効処理
を行ない、製品鋼板の加工性に有害な固溶炭素を析出ｙ
せる。As is well known, in continuous annealing of steel plates, the steel plate after cold rolling is heated to a temperature of about 700 to 850°C, then soaked for about 1 minute to recrystallize, and then heated to about 400°C.
The carbon in the steel is rapidly cooled to a supersaturated state. Subsequently, over-aging treatment is performed for 2 to 3 minutes in a furnace at approximately 400°C to precipitate solute carbon that is harmful to the workability of the product steel sheet.
let

このような従来のヒートサイクルは−Ｑ２加■−川の鋼
板製造には十分なものであるか、深絞り用鋼板、特にＤ
ＤＱクラスの高度な加」二゛性を要求される用途には不
十分なものである。その理由は、ト述の２〜３分程度の
過時効処理では固溶炭素かまた上のなレベルまで析出し
ておらす、鋼板製造後の時効劣化により降伏点の」−昇
、伸びの低−ド、鋒伏点伸びの発生等の加工性低ドを生
ずるためである。このり、１策として製鋼段階で炭素を
極力低減せしめかつ４ｆｉ！Ｉ量に残存する炭素を、チ
タン等の添加により化合物として固定することにより過
時効処理不要な高加工性鋼板を製造する方法がとられて
いるか、素材コストは上Ａする。又、通常の安価な素材
（ｉＲ素含有量０．０３〜０．０５　Ｘ）で高加工性を
ｆｌｌようとすれば長時間の過時効処理を必要とするが
、従来の大径ハースロールを有する竪型炉ではその設備
は膨大な規模となり、実現性のないものであった。Is such a conventional heat cycle sufficient for producing steel sheets for deep drawing, especially D?
This is insufficient for applications requiring a high level of DQ-class additive duality. The reason for this is that during the over-aging treatment of about 2 to 3 minutes as mentioned above, solid solute carbon precipitates to an even higher level, and aging deterioration after manufacturing the steel sheet raises the yield point and lowers the elongation. This is because it causes poor workability, such as the occurrence of deformation and elongation at the bending point. Therefore, one measure is to reduce carbon as much as possible at the steel manufacturing stage and achieve 4fi! Is there a method of manufacturing a highly formable steel plate that does not require over-aging treatment by fixing the carbon remaining in the I amount as a compound by adding titanium or the like, or the material cost increases. In addition, if you try to achieve high workability with ordinary inexpensive materials (iR element content 0.03 to 0.05 The scale of the equipment required for a vertical furnace would be enormous, making it unfeasible.

さて時効劣化は一般に時効指数で評価ｙれ、その価か約
３Ｋｇ／ｍｍ２以下であればＤＤＱの製造が可能と云わ
れている。上記安価な素材で、この時効指数３　Ｋｇ／
ｍｍ’以下の達成に必要な過時効時間は２０〜３０分以
上とされている。すなわち従来ヒートサイクルの実に１
０倍以−ヒの過時効時間が必要なわけで、これを通常の
竪型炉で実現しようとすれば過・１ １１「１効炉の炉長だけで３００〜５００ｍといった規
模となり、全く非現実的なものでしかなかった。Now, aging deterioration is generally evaluated by an aging index, and it is said that DDQ can be manufactured if the index is about 3 kg/mm2 or less. With the above inexpensive material, this aging index is 3 kg/
The overaging time required to achieve a hardness of 20 to 30 minutes or more is said to be 20 to 30 minutes or more. In other words, the conventional heat cycle
An overaging time of 0 times or more is required, and if this was attempted to be achieved with a normal vertical furnace, the length of a single-effect furnace alone would be 300 to 500 m, which would be completely unreasonable. It was just a realistic thing.

本発明はかかる従来技術の問題を解決するために発明さ
れたもので、−次冷却炉から送出された鋼板をへりカル
ターン装置により板幅方向が垂直となるよう転向せしめ
、エンドレスに循環する厚手のガイド用鋼板に沿わせて
外周から内周へと渦巻状に走行せしめ、内周において別
途設けられたへりカルターン装置により再び本来の板幅
方向が水平なパスに復帰せしめて後続する二次冷却炉へ
と送出するという極めてコンパクトな構造を有する過時
効炉によりＤＤＱ製造に必要な長時間過時効処理を可能
にしたものである。The present invention was invented in order to solve the problems of the prior art, and consists of turning a steel plate delivered from a secondary cooling furnace so that the width direction of the steel plate is perpendicular using a helical turning device, The steel plate is run in a spiral shape from the outer circumference to the inner circumference along the guide steel plate, and a separately installed edge calturn device is used on the inner circumference to return the original plate width direction to a horizontal path, which leads to the subsequent secondary cooling furnace. This overaging furnace has an extremely compact structure and enables the long-term overaging treatment required for DDQ production.

以下具体的なｌ実施例に基き本発明を説明する。The present invention will be explained below based on specific examples.

連続焼鈍炉全体を示す第５図において、−次冷却を終了
し約４００°Ｃとなった鋼板ｌは、＝−次冷却炉５０の
出口に設けられたへりカルターン装置２により板幅方向
が垂直となるよう転向せしめられる。このへりカルター
ン装置としては本発明者等による特開昭５５−８０１（
４１号公報［帯状金属板の進行方向変更装置」　（第７
図）を用いてもよいし、また第６図に示すような気体浮
上方式を用い−（もよい。第６図において１圧された気
体はノズル８１よりｌｌＪ’ｊ出し、その圧力によって
鋼板ｌを浮上させる。ｉ′５７図において鋼板ｌは円筒
面上に固定されたローラ４１’）ｌ！３により進行方向
を転換する。なお、へりカルターン装置ξ２による鋼板
の転向機構は第２図　（Ａ）（第１図Ａ−Ａ線断面図）
のようになる。In FIG. 5, which shows the entire continuous annealing furnace, the steel plate 1, which has undergone the second cooling and reached approximately 400°C, is turned vertically in the width direction by the edge cal turn device 2 installed at the outlet of the second cooling furnace 50. He is converted to become. As this edge car turn device, Japanese Patent Application Laid-open No. 55-801 (
Publication No. 41 [Device for changing the traveling direction of a band-shaped metal plate] (No. 7
), or a gas levitation system as shown in FIG. 6 may be used. In FIG. i') In Figure 57, the steel plate l is fixed on the cylindrical surface of the roller 41') l! 3 changes the direction of travel. The turning mechanism of the steel plate by the helical turning device ξ2 is shown in Figure 2 (A) (cross-sectional view taken along the line A-A in Figure 1).
become that way.

転向後の鋼板１は、第３図に示す如く別途エンドレスに
Ｗ環走行するガイド用鋼板３に重ね合わせられ、一体と
なって過時効炉内を外周から内周へ渦巻状しこ走行する
。第２図（Ｆ）、第３図（第１図＋ｒ＋ｒ　＋Ｉ′Ｉｉ
　Ｆ　−Ｆ　）および第４図によりこの渦巻走行の４幾
構を説明する。The steel plate 1 after turning is superimposed on a guide steel plate 3 which separately runs in an endless W ring as shown in FIG. 3, and integrally runs in a spiral shape from the outer periphery to the inner periphery in the overaging furnace. Figure 2 (F), Figure 3 (Figure 1 +r+r +I'Ii
The four configurations of this spiral travel will be explained with reference to F-F) and FIG.

ガイド用鋼板３は渦巻中心に対し放射状に配列されたカ
イＩ・ローラ群４により走行せしめられる。ガイドロー
ラ４は一定ピッチの溝４ａを有しモータ８により駆動さ
れる。鋼板ｌはガイド用鋼板３の外面１こ沿ってガイド
用鋼板とともに走行する。３ａは鋼板のエンジを支える
爪であり、第４図に小才ように一定ピンチでガイド用鋼
板上に溶接されている。鋼板ｌのみを渦巻状に走行させ
ようとしても剛性不足のため不可能であるが、このよう
に十分な剛性をもったガイド川す１１板を採用しこれに
鋼板を重ね合わせることにより、板幅プＪ向に垂直な状
態での走行か可能になる。第２図におｌ、％て９は炉内
温度を維持するためのヒータである。The guide steel plate 3 is made to travel by a group of rollers 4 arranged radially with respect to the center of the spiral. The guide roller 4 has grooves 4a at a constant pitch and is driven by a motor 8. The steel plate 1 runs along one outer surface of the guide steel plate 3 together with the guide steel plate. 3a is a claw that supports the edge of the steel plate, and is welded onto the guide steel plate with a certain pinch as shown in Fig. 4. It would be impossible to run only the steel plate l in a spiral shape due to lack of rigidity, but by adopting the guide river plate 11 with sufficient rigidity and overlapping the steel plates on it, the plate width can be reduced. It becomes possible to run perpendicular to the direction of the road. In FIG. 2, 1 and 9 are heaters for maintaining the temperature inside the furnace.

さて第１図において最内周まで達した銅板ｌとガイド用
鋼板３はデフレクタロールｌＯにより内周から離れへり
カルターン装置５に至る。ここで第２図　（Ｅ）に示す
ようにガイド用鋼板３はへりカルターン装置５によりそ
の幅方向を水平にかえながら上方へと走行する。一方鋼
板ｌは第２図（Ｄ）に示すように、ガイド用鋼板から別
れてデフレクタロール１１およびへりカルターン装置１
６．デフレクタロール１２により後続する二次冷却炉へ
送出される。Now, in FIG. 1, the copper plate 1 and the guide steel plate 3, which have reached the innermost periphery, are separated from the inner periphery by the deflector roll IO and reach the calturn device 5. Here, as shown in FIG. 2(E), the guide steel plate 3 travels upward while changing its width direction horizontally by the helical turn device 5. On the other hand, as shown in FIG. 2(D), the steel plate 1 is separated from the guide steel plate to include a deflector roll 11 and a helical turn device 1.
6. It is delivered by deflector rolls 12 to the subsequent secondary cooling furnace.

次いで、ガイド用鋼板３はデフレクタロール１３を経て
再ひ渦巻走行の外周へと向う。第ｚｔｉ（ｃ：＋に示す
ようにガ・イド用鋼板３はデフレクタロール１４、へり
カルターン装置６およびデフレクタロール１５により（
■ｆひ元の位置に戻る。Next, the guide steel plate 3 passes through the deflector roll 13 and heads toward the outer periphery of the spiral running again. As shown in the zti (c:
■f Return to the original position.

なおガイＦ用鋼板３の鋼板エツジを支える爪３ａのにｉ
　ＰＩは、仕様最大板幅に相当する位置となっている。Note that the claw 3a that supports the steel plate edge of the steel plate 3 for the guy F is
PI is located at a position corresponding to the specified maximum board width.

鋼板幅が最大幅より小さいときは本過時効炉入１」にお
ける鋼板エツジ位置は爪３ａより上方となり、渦巻走行
中に徐々に下降して爪の位置まで来る。該炉入口におけ
る板エツジ位置を常に爪３ａの４一方に維持するため、
ハースロール７はステアリングロールとすることが望ま
しい。When the steel plate width is smaller than the maximum width, the edge position of the steel plate in the main over-aging furnace 1 is above the claw 3a, and gradually descends to the claw position during spiral running. In order to always maintain the plate edge position at the furnace inlet on one side of the claws 3a,
It is desirable that the hearth roll 7 is a steering roll.

また鋼板表面マーク防止上鋼板ｌに用いる入側、出側の
へりカルターン装置２および１６には第６図の気体浮−
Ｌ方式が望ましく、カイト用鋼板のへりカルターン装置
５および６ｔ−１ｉ特開昭５５−８Ｏｆ（４１吋公報の
方式で充分である。In addition, in order to prevent marks on the steel plate surface, gas floats as shown in FIG.
The L method is preferable, and the method disclosed in JP-A-55-8Of (41-inch publication) for kite steel plate hem cal turn device 5 and 6t-1i is sufficient.

次に本発明の方式による過時妬炉の容量について説明す
る。該炉内の鋼板全長をり、渦巻路の内径をＤＩ＋外径
をＤ２　、渦巻ピッチをＰ（第３図１．　　　　参照）
とすると となる。−例としてＤｌ　＝１５ｍ　、　Ｄ２　＝２０
ｍ　、　Ｐ＝　２０ｍｍの場合、Ｌ　＝　６９００ｍと
なり、ラインス、ピード２３０ｍ／分の炉で３０分の過
時効処理かり能となる。Next, the capacity of the overage furnace according to the method of the present invention will be explained. Calculate the entire length of the steel plate in the furnace, the inner diameter of the spiral path is DI + the outer diameter is D2, and the spiral pitch is P (see Fig. 3, 1).
Then, it becomes . - For example Dl = 15m, D2 = 20
When m and P = 20 mm, L = 6900 m, which allows overaging treatment for 30 minutes in a furnace with a line speed of 230 m/min.

第５図は本発明の技術を用いた連続焼鈍炉の全体図であ
る。鋼板ｌは加熱炉３０．灼熱炉４０．−次冷却炉５０
をへて本発明による過時効炉６０に入る。FIG. 5 is an overall view of a continuous annealing furnace using the technique of the present invention. The steel plate l is heated in a heating furnace 30. Scorching furnace 40. -Next cooling furnace 50
After passing through, it enters an overaging furnace 60 according to the present invention.

その後二次冷却炉（第５図では水スプレー冷却）７０、
ドライヤ７１をへて出側ルーパーへと送出される。第５
図から明らかなように本発明の技術を用いれば長時間の
過時効処理をコンバク）・な炉で行えるばかりでなく、
過時効以降の全設備を全て低層建屋内に収めることがで
き建築費の大幅な節減にも蚕与することがでくる。After that, a secondary cooling furnace (water spray cooling in Fig. 5) 70,
It passes through the dryer 71 and is sent to the output looper. Fifth
As is clear from the figure, by using the technology of the present invention, not only can long-term overaging treatment be performed in a furnace, but also
All of the equipment used after aging can be housed in a low-rise building, resulting in significant savings in construction costs.

以上述べたように本発明によれば、長時間の過時効処理
を鋼板の走行を停止することなく行なうことができると
共に、コンパクトな実用性の高い長時間過時効炉の設備
技術を提供することが可能となる。従って、本発明は従
来不ｏｆ能であった通當の素材（極低炭素鋼でない）を
用いた連続焼鈍によるＤＤＱの製造を可能にする画期的
新技術であり、その利益は計りしれないものである。As described above, according to the present invention, it is possible to carry out long-term overaging treatment without stopping the running of the steel plate, and to provide equipment technology for a compact and highly practical long-term overaging furnace. becomes possible. Therefore, the present invention is a revolutionary new technology that makes it possible to manufacture DDQ by continuous annealing using conventional materials (not ultra-low carbon steel) that were previously impossible, and the benefits thereof are immeasurable. It is something.

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

第ｔｖ５は本発明を実施するための長時間過時効炉の　
例を示す平面図、第２図（Ａ）　、　（Ｂ）　、　（Ｃ
）　、　（Ｄ）　。 （Ｅ）、（Ｆ＞はそれぞれ第１図Ａ−Ａ　、　Ｂ−Ｂ　
、　Ｃ−Ｃ、Ｄ−Ｄ　、　Ｅ−Ｅ　、　Ｆ−Ｆ線断面図
、第３図は渦巻走行路の断面詳細図、第４図は第１図の
一線断面図、第５図は本発明を適用した連続焼鈍炉の１
実施例図、第６図は気体源」１式によるへりカルターン
装置を示す説明１閾、第７図はローラ式ヘリカルクーン
装置を示す説明図である。 ｌ・・・鋼板、２，１６・・・−・リカルターン装置（
鋼板用〕１．３・・・カイト用鋼板、３ａ・・・爪、４
・・・カイトローラ、４ａ・・・溝、５．６・・・へり
カルターン装置（カーｆｌ：’≦ｉ！ｌ　４ＪｙＪｌし
、７・・・ハースロール、８・・・モーフ、９・・・ｉ
ニータ、１０．＋１．１２，１３，１４．１５・・・デ
フレフクロール、３０・・・加熱炉、４０・・・均熱炉
、５０・・・−次冷却炉、６０・・・過１１１１効炉、
７０・・・二次冷却炉、７１・・・トラｒヤー、８１・
・・ノスル。 第　７図 手　糸売ネＨ３ｊ］玉書　（自発） 昭和５８年７月す日 特許庁長官　若　杉　和　夫　１段 １、・バヂ１の表示 昭和５８年特許願第９５０１７号 ２、発明の名称 鋼板の連続焼鈍方法 ３、補正をする者 中１件との関係　出願人 住所　東京都千代田区大手町二丁１１６番３号名称　　
（６６５）新日本製鐵株式会社４、代　理　人 ５、補正の対象　　明細書の図面の簡単な説明の欄６、
補正の内容 （１）明細書ｆｊｒ、９頁８行の「第４図は第１図の一
線」を［第４図は第１図のＧ−Ｇ線」と補正する。Part 5 is a long-term overaging furnace for carrying out the present invention.
Plan views showing examples, Figures 2 (A), (B), (C
), (D). (E) and (F> are shown in Figure 1 A-A and B-B, respectively)
, CC, D-D, E-E, FF line sectional views, FIG. 3 is a detailed sectional view of the spiral running path, FIG. 4 is a line sectional view of FIG. 1, and FIG. 5 is a cross-sectional view of the present invention. 1 of the continuous annealing furnace that applies
FIG. 6 is an explanatory diagram showing a helical Kuhn device using a single gas source; FIG. 7 is an explanatory diagram showing a roller-type helical Kuhn device. l...Steel plate, 2,16...--Recal turn device (
For steel plate] 1.3... Steel plate for kite, 3a... Claw, 4
...Kite roller, 4a...Groove, 5.6...Hedge cal turn device (car fl:'≦i!l 4JyJl, 7...Hearth roll, 8...Morph, 9... i
Neeta, 10. +1.12,13,14.15...deflation crawl, 30...heating furnace, 40...soaking furnace, 50...-cooling furnace, 60...super-1111 effect furnace,
70...Secondary cooling furnace, 71...Trayer, 81.
... Nosul. Figure 7 Hand Itotome H3j] Tamaki (self-motivated) July 1980 Commissioner of the Japan Patent Office Kazuo Wakasugi 1 paragraph 1 Badge 1 indication 1982 Patent Application No. 95017 2 Title of the invention Continuous annealing method for steel plates 3, relationship with one of the amendments Applicant address: 116-3 Otemachi 2-chome, Chiyoda-ku, Tokyo Name
(665) Nippon Steel Corporation 4, Agent 5, Subject of amendment: Brief description of drawings in the specification column 6,
Contents of correction (1) In specification fjr, page 9, line 8, ``Figure 4 is a line from Figure 1'' is corrected to ``Figure 4 is line GG in Figure 1''.

Claims (1)

【特許請求の範囲】[Claims] 加熱、灼熱、−・次冷却、過時効および二次冷却からな
るヒートサイクルを与える鋼板の連続焼鈍方法において
、−次冷却炉から送出された鋼板ｌをへりカルクーン装
；δ２により板幅方向が垂直となるよう１１シ；向せし
め、ａｋへりカルターン装置の出１１において回一方向
に同一速度で走行するカイト川鋼板３に改ね合わせ、一
体となって走行する鋼板１とガイド用鋼板３とを放射状
に配列されたカイトローラｆｉｌ　４の描４ａに沿わせ
て外周から内周に向けて渦巻状に走行せしめ、最内周に
おいてガイド川鋼板３は鋼板１から分離してヘリカルク
ーン装置５および６を経て再び最外周に戻るとともに、
ｌ＼リカルターン装置５の位置においてガイド用鋼Ｍｙ
、３から分離した鋼板１をへりカルターン装置１Ｇによ
り再び板幅方向が水平となるよう転向せしめ、後続する
二次冷却炉に送出せしめて過時効を行なうことを特徴と
する銅板の連続焼鈍方法。In a continuous annealing method for steel plates that provides a heat cycle consisting of heating, scorching, secondary cooling, overaging, and secondary cooling, the steel plate l sent out from the secondary cooling furnace is placed in a Calcoon furnace; the width direction of the plate is vertical due to δ2. Then, at the output 11 of the ak edge cal turn device, the steel plate 1 and guide steel plate 3, which run as one, are aligned with the Kaitokawa steel plate 3, which runs at the same speed in one direction. The guide river steel plate 3 is separated from the steel plate 1 at the innermost circumference, and the guide river steel plate 3 is separated from the steel plate 1 and connected to the helical Kuhn devices 5 and 6. After returning to the outermost circumference,
l\ At the position of the recal turn device 5, the guide steel My
, 3. A continuous annealing method for a copper plate, characterized in that the steel plate 1 separated from the steel plate 1 is turned again so that the width direction of the plate becomes horizontal using an edge calturn device 1G, and then sent to a subsequent secondary cooling furnace for overaging.