JPS6272429A - Hot straightening method for thick steel plate - Google Patents
Hot straightening method for thick steel plateInfo
- Publication number
- JPS6272429A JPS6272429A JP21106585A JP21106585A JPS6272429A JP S6272429 A JPS6272429 A JP S6272429A JP 21106585 A JP21106585 A JP 21106585A JP 21106585 A JP21106585 A JP 21106585A JP S6272429 A JPS6272429 A JP S6272429A
- Authority
- JP
- Japan
- Prior art keywords
- steel plate
- temperature
- tip
- hot straightening
- straightening
- 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.)
- Pending
Links
Landscapes
- Straightening Metal Sheet-Like Bodies (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、造船用厚鋼板、パイプ用厚鋼板、圧力容器用
厚鋼板、海洋構造物用厚鋼板等を圧延し加速冷却後に行
う熱間矯正に関するものである。Detailed Description of the Invention (Industrial Field of Application) The present invention relates to hot rolling, which is performed after accelerated cooling of steel plates for shipbuilding, steel plates for pipes, steel plates for pressure vessels, steel plates for marine structures, etc. It is about correction.
（従来の技術）
圧延鋼板の製造に際し、熱間圧延終了時における鋼板の
保有熱を利用して以後の冷却過程を制御する加速冷却は
、フェライト粒成長抑制とベイナイトまたは／およびマ
ルテンサイトの微細分散によって鋼板の強度、靭性の向
上をもたらすため従来の空冷材に比べて添加成分を少な
くできること、炭素当量を低く抑えることができるので
溶接性が向上できること及び従来再加熱後に急冷または
徐冷して材料強度を確保していた工程を省略できる等の
利点を有している。このため、水冷型ＴＭＣＰ（Ｔｈｅ
ｒｍｏｍｅｃｈａｎｉｃａｌ Ｃｏｎｔｒｏｌ ｒ’
ｒｏｃａｓｓ）鋼に関しての研究が盛んとなり、現在は
加速冷却装置を完成させて生産体制に入っている。しか
しながら、加速冷却中に鋼板の先尾端および幅端が適冷
されるために、一枚の鋼板内で冷却の不均一による温度
差が生じ、加速冷却後熱応力が発生し鋼板の変形を誘発
する。そのために冷間矯正を要さなければならなくなり
、矯正費用が嵩むほか、生産能率を低下せしめる。また
、鋼板を切断すると変形が牛しる頻度が高くなる問題が
１しる。(Prior art) When manufacturing rolled steel sheets, accelerated cooling, which controls the subsequent cooling process by utilizing the heat retained in the steel sheet at the end of hot rolling, is used to suppress ferrite grain growth and to finely disperse bainite and/or martensite. This improves the strength and toughness of the steel sheet, so the amount of added ingredients can be reduced compared to conventional air-cooled materials. The carbon equivalent can be kept low, which improves weldability. It has the advantage of being able to omit the process of ensuring strength. For this reason, water-cooled TMCP (The
rmomechanical Control r'
Research into steel (Rocas) has become more active, and we have now completed an accelerated cooling system and are starting production. However, because the leading edge and width edge of the steel plate are cooled appropriately during accelerated cooling, temperature differences occur within a single steel plate due to uneven cooling, and thermal stress occurs after accelerated cooling, causing deformation of the steel plate. provoke. Therefore, cold straightening is required, which not only increases straightening costs but also reduces production efficiency. Another problem is that when a steel plate is cut, deformation occurs more frequently.
そこで、鋼板の幅端が過冷却することを防止する方法が
特開昭５６−９５４０４号公報で、また鋼板の″先尾端
が適冷０１することを防止することが特開昭５６−８６
６２２ 号公報で提案されている。Therefore, Japanese Patent Application Laid-Open No. 56-95404 discloses a method for preventing the width end of a steel plate from being overcooled, and Japanese Patent Application Laid-Open No. 56-86 discloses a method for preventing the leading and trailing ends of a steel sheet from being overcooled.
This is proposed in Publication No. 622.
一方、鋼板の冷却中の対策とは別に、加速冷却後鋼板全
体を５００℃〜Ａｃｔの温度範囲にまで頁別ｐＬで鋼板
面内の温度分布の均一化を図ることが特公昭５９−３４
２１３ 号公報で提案さ、れでいる。On the other hand, apart from the countermeasures taken during cooling of the steel plate, it was proposed in Japanese Patent Publication No. 59-34 to try to make the temperature distribution within the surface of the steel plate uniform by pL for each page up to the temperature range of 500℃~Act for the entire steel plate after accelerated cooling.
It was proposed and published in Publication No. 213.
（発明が解決しようとする問題点） Ｌかし、前者の方法には次のような欠へかある。(Problem to be solved by the invention) However, the former method has the following drawbacks.
−）すり、圧延時に鋼板の先尾端に反りが生しているた
めに溜り水が牛しる。そのためにｒｉＡ仮の温度を完全
に均一化することが国運となる問題が生じる。−) Warpage occurs at the leading and trailing ends of the steel plate during rolling and rolling, resulting in standing water. Therefore, a problem arises in which it is a matter of national fortune to completely equalize the temporary riA temperatures.
また、後者の方法では再加熱するので、鋼の強度を出す
ためのへイナイトまたは／およびマルチ、サイトが焼戻
されるために強度が低下したり、飲１板全体を再加熱す
るための炉を設けなければな、°、なかったり、また力
１１１！冷却をしている間は常に炉温を５００°Ｃ以上
に保□、ておく必要があることから費用が嵩むなどの問
題があった。In addition, since the latter method requires reheating, it is necessary to use haynite or/and mulch to increase the strength of the steel, and the strength may decrease due to the site being tempered, or a furnace is required to reheat the entire steel sheet. I have to set it up, °, it's not there, it's power 111 again! Since it is necessary to maintain the furnace temperature at 500° C. or higher at all times during cooling, there are problems such as increased costs.
本発明は、冷間矯正を行うごとなくかつ鋼板の機械的性
質を変えることなく、加速冷却された厚鋼板の先尾端の
形状不良を是正する方法を提供することをＬ１的とする
。The object of the present invention is to provide a method for correcting a shape defect at the leading and trailing ends of an acceleratedly cooled thick steel plate without performing cold straightening and without changing the mechanical properties of the steel plate.
（問題点を解決するための手段）
本発明は、鋼板の先尾端と中央部を同一の冷却条件で冷
却することが困難であることから冷却停止時に先尾端が
適冷されることはやむなしとして、圧延後加速冷却され
た厚鋼板を熱間矯正する直前に鋼板の先尾端の温度が中
央部の温度以トになるように該鋼板の先尾端を加熱する
ことを特徴とするものである。(Means for Solving the Problems) The present invention provides that, since it is difficult to cool the leading end and the central part of a steel plate under the same cooling conditions, it is difficult to cool the leading end and the central part of the steel plate properly when cooling is stopped. As a matter of necessity, immediately before hot straightening a thick steel plate that has been accelerated and cooled after rolling, the leading and trailing ends of the steel plate are heated so that the temperature at the leading and trailing ends of the steel plate is lower than the temperature at the center. It is something.
この鋼板の先尾端を加熱するにあたっては、先端７およ
び尾端８と鋼板の中央部６との温度差が第３図に示すよ
うに固有であることから、各々独立に行ない１３０熱終
了時点も異なる。また、加熱時間の設定は温度勾配に基
く計算または鋼１仮の先尾端と中央部の温度を測定する
ことによめ決定される。この際、鋼板の先尾端の温度が
中央部の温度１；’１５０℃以上高くならないように加
熱時間を定める。さらに、＠仮の端部を加熱する際の幅
は圧延’、＋ｋｌびに冷却条件の変動により変化するの
で、鋼亭１反艮毛方向の温度分布を放射温度計等の測温
手段、こより測定し先尾端付退の温度が急激に低下する
部分を認識し決める。また、加熱手段は短時間でに執で
きるもの、例えば高／１！！にした鈑１板を当てるとか
ガスバーナー、赤外線、高周波による加熱が採用できる
。When heating the leading and trailing ends of this steel plate, since the temperature difference between the leading edge 7 and the tailing edge 8 and the central part 6 of the steel plate is unique as shown in Fig. 3, each heating is performed independently. are also different. Further, the setting of the heating time is determined by calculation based on the temperature gradient or by measuring the temperature at the tentative leading edge and center of the steel 1. At this time, the heating time is determined so that the temperature at the leading and trailing ends of the steel plate does not rise above the temperature at the center by 150°C. Furthermore, since the width when heating the temporary end changes due to rolling, +kl, and fluctuations in cooling conditions, the temperature distribution in the opposite direction of Koutei 1 is measured using a temperature measuring means such as a radiation thermometer. Recognize and determine the part where the temperature suddenly decreases at the leading and trailing ends. Also, the heating means should be one that can be applied in a short time, such as high/1! ! Heating can be done by applying a heated sheet or by heating with a gas burner, infrared rays, or high frequency.
（作 用）
通常圧延後空冷された鋼板を熱間矯正する場合には矯正
後の鋼板は殆ど変形しないが、加速冷却された鋼板は温
度不均一に基く熱応力により熱間矯正直後形が生じる場
合が多い。このため、熱間矯正直前に鋼板の温度分布を
均一化して鋼板の変形防止を計るものである。なお、熱
間矯正直後では鋼板を平坦にしてからの部分加熱となる
ので、新たな変形が生して効果を発揮できない。(Function) When a steel plate that has been air-cooled after normal rolling is hot-straightened, the steel plate after straightening hardly deforms, but a steel plate that has been acceleratedly cooled has a shape immediately after hot-straightening due to thermal stress caused by temperature unevenness. There are many cases. For this reason, the temperature distribution of the steel plate is made uniform just before hot straightening to prevent the steel plate from deforming. Note that immediately after hot straightening, the steel plate is flattened before being partially heated, so new deformation occurs and the effect cannot be achieved.
（実施例）
圧延後加速冷却されたＣを０．０８％、Ｍｎを１．２％
を含む厚み１５ｍｍ、幅２５００ｍｍ、長さ２０ｍの厚
鋼板１０枚のうち５枚は放射温度計で鋼板の下面の先端
、中央および尾端の温度を測定し、そのまま熱間矯正を
した。(Example) 0.08% C and 1.2% Mn accelerated cooling after rolling
For 5 out of 10 thick steel plates with a thickness of 15 mm, a width of 2500 mm, and a length of 20 m, the temperature at the tip, center, and tail end of the lower surface of the steel plate was measured using a radiation thermometer, and the steel plates were hot straightened as they were.
残りの５枚の鋼板についはその先尾端に８００°Ｃに加
熱した３０ｍｍ Ｘ ２００ｎｖ Ｘ ３０００ｍｍの
熱源供給用の鋼板２を第１図に示すように、熱間矯正前
の鋼板ｌ上に静置し、鋼板下面の先端、中央部および尾
端の温度を放射温度計で測定しながら、熱間矯正機 前
で待機した。この際、第２図に示す位置の温度を測定し
、鋼板の先尾端の温度が第３図に示す如く中央部の温度
に達したとき、それぞれりへ源供給用鋼板を除去して直
ちに熱間矯正をした。そののち鋼板を室温まで空冷して
から、該鋼板を第４ａ図および第４ｂ図に示す定盤９の
上に乗せて定盤上に設けたピアノ線からの距離を測定し
鋼板の変形量を測定した。この結果を加熱前の温度、熱
間矯正直前の温度、および引張り強さと併せて第１表に
示す。For the remaining five steel plates, a heat source supply steel plate 2 of 30 mm x 200 nv x 3000 mm heated to 800°C was placed at the leading and trailing ends of the steel plate 2 before hot straightening, as shown in Fig. 1. The steel plate was placed on the steel plate, and the steel plate was placed on standby in front of the hot straightening machine while measuring the temperature at the tip, center, and tail of the lower surface of the steel plate using a radiation thermometer. At this time, the temperature at the position shown in Figure 2 is measured, and when the temperature at the leading and trailing ends of the steel plate reaches the temperature at the center as shown in Figure 3, the steel plate for supplying the source to each is removed and immediately I did hot straightening. After that, the steel plate is air-cooled to room temperature, and then the steel plate is placed on the surface plate 9 shown in FIGS. 4a and 4b, and the distance from the piano wire provided on the surface plate is measured to determine the amount of deformation of the steel plate. It was measured. The results are shown in Table 1 together with the temperature before heating, the temperature immediately before hot straightening, and the tensile strength.
この表からもわかるように、熱間矯正の直前に鋼板の先
尾端を加熱する本発明の方法によれば、この処理を施さ
なかった鋼板に比較し銅板の変形量が小さくなり、５枚
とも２ｍｍ以下であった。また、鋼板の先尾端および中
央部の引張り強さについては、本発明によればその差は
２ｋｇｆ／ｍｍ２以内であるのに対して、この処理を施
さない鋼板は３〜５ ｋｇｆ／ｍｍ”であった。As can be seen from this table, according to the method of the present invention in which the leading and trailing ends of the steel plate are heated immediately before hot straightening, the amount of deformation of the copper plate is smaller than that of the steel plate that is not subjected to this treatment. Both were 2 mm or less. Furthermore, according to the present invention, the difference in tensile strength between the leading edge and the central portion of the steel plate is within 2 kgf/mm2, whereas that of the steel plate without this treatment is 3 to 5 kgf/mm. Met.
（発明の効果）
以上説明したように本発明によれば、冷間矯正を行うこ
となく、かつ鋼板の機械的性質を変えることなく加速冷
却された厚鋼板の形状不良を防止できる。(Effects of the Invention) As described above, according to the present invention, it is possible to prevent shape defects in a thick steel plate that has been acceleratedly cooled without performing cold straightening and without changing the mechanical properties of the steel plate.
第１図は熱間矯正する直前で厚鋼板の先尾端を加熱して
いる状態を示す図であり、
第２図は厚鋼板の温度を測定する位置を示す図であり、
第３図は厚鋼板の先尾端を加熱した場合の測温曲線を示
す図であり、
第４ａ図および第４ｂ図は厚鋼板の変形量を測定する仕
方を表す図である。
１−・鋼板 ２−・熱源供給用鋼板３−搬
送ロール ４・−熱間矯正機５−測温位置
６−・鋼板中央部温度７−鋼板先端部温度 ８−
・−鋼板先端部温度９一定盤 １０−・ピ
アノ線第３図
第４ａ図Fig. 1 is a diagram showing the state in which the leading and trailing ends of a thick steel plate are heated just before hot straightening, Fig. 2 is a diagram showing the position where the temperature of the thick steel plate is measured, and Fig. 3 is a diagram showing the position where the temperature of the thick steel plate is measured. FIG. 4 is a diagram showing a temperature measurement curve when the leading and trailing ends of a thick steel plate are heated, and FIGS. 4a and 4b are diagrams showing how to measure the amount of deformation of a thick steel plate. 1- Steel plate 2- Steel plate for heat source supply 3- Conveyance roll 4- Hot straightening machine 5- Temperature measurement position
6-・Temperature at the center of the steel plate 7-Temperature at the tip of the steel plate 8-
- Steel plate tip temperature 9 constant plate 10 - Piano wire Figure 3 Figure 4a
Claims (1)
間矯正する直前に該鋼板の先端および尾端の温度が該鋼
板の中央部の温度と同等になるまで該鋼板の先端および
尾端を加熱することを特徴とする厚鋼板の熱間矯正方法
。 ２、圧延後加速冷却された厚鋼板を熱間矯正する際、熱
間矯正する直前に該鋼板の先端、尾端および中央部の温
度を検出し、該鋼板の先端および尾端の温度が該鋼板の
中央部の温度と同等になるまで該鋼板の先端および尾端
を加熱することを特徴とする厚鋼板の熱間矯正方法。[Claims] 1. When hot straightening a thick steel plate that has been accelerated and cooled after rolling, the temperature at the tip and tail ends of the steel plate becomes equal to the temperature at the center of the steel plate immediately before hot straightening. 1. A method for hot straightening a thick steel plate, characterized by heating the tip and tail ends of the steel plate until the tip and tail end of the steel plate are heated to a maximum temperature. 2. When hot straightening a thick steel plate that has been acceleratedly cooled after rolling, detect the temperature at the tip, tail, and center of the steel plate immediately before hot straightening, and check whether the temperature at the tip or tail of the steel plate is within the range. 1. A method for hot straightening a thick steel plate, comprising heating the tip and tail ends of the steel plate until the temperature is equal to the temperature at the center of the steel plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21106585A JPS6272429A (en) | 1985-09-26 | 1985-09-26 | Hot straightening method for thick steel plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21106585A JPS6272429A (en) | 1985-09-26 | 1985-09-26 | Hot straightening method for thick steel plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6272429A true JPS6272429A (en) | 1987-04-03 |
Family
ID=16599817
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21106585A Pending JPS6272429A (en) | 1985-09-26 | 1985-09-26 | Hot straightening method for thick steel plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6272429A (en) |
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-
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- 1985-09-26 JP JP21106585A patent/JPS6272429A/en active Pending
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