JP3948275B2 - Seamless steel pipe manufacturing equipment - Google Patents

Seamless steel pipe manufacturing equipment Download PDF

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JP3948275B2
JP3948275B2 JP2001396503A JP2001396503A JP3948275B2 JP 3948275 B2 JP3948275 B2 JP 3948275B2 JP 2001396503 A JP2001396503 A JP 2001396503A JP 2001396503 A JP2001396503 A JP 2001396503A JP 3948275 B2 JP3948275 B2 JP 3948275B2
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steel pipe
reheating furnace
mill
conveying means
cooling
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JP2003200206A (en
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宣男 佐藤
寿雄 大西
秀雄 佐藤
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JFE Steel Corp
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JFE Steel Corp
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【０００１】
【発明の属する技術分野】
本発明は、継目無鋼管の製造装置に係わり、特に従来より温間圧延を効率良く行えるようにする技術に関する。
【０００２】
【従来の技術】
近年、油井管、ラインパイプ等に使用される継目無鋼管を、６００〜８５０℃という従来より低い温度でストレッチ・レデュサー等を用い絞り圧延して製造する技術（温間圧延という）が実用化されている。例えば、特開平５−７０８３１号公報は、高強度継目無鋼管を得るため、鋼片を熱間圧延して製管した中空素管を、温度６００〜７２５℃に保持された加熱炉でフェライト変態を８０％以上完了する時間で加熱した後、温度５００℃以上で圧下率５〜４０％の絞り圧延を施す技術を提案している。また、特開昭６３−２４１１１７号公報は、靭性と耐応力腐食割れ性に優れたマルテンサイト系ステンレス継目無鋼管を得るため、下記工程を順次行なう技術を開示している。
ａ．鋼片を１０５０〜１２５０℃に加熱し、穿孔、圧延する、
ｂ．少なくとも５００℃までを３０℃／分以上の冷却速度としてマルテンサイト変態開始温度以下の温度まで冷却して８０容量％以上がマルテンサイトで占める金属組織とする、
ｃ．Ａｃ1変態点〜（Ａｃ1変態点−２００℃）の温度に再加熱し、断面減少率で５％以上の仕上圧延を行った後、空冷又は強制冷却する。
【０００３】
ところで、多くの継目無鋼管の製造工場で前記したような温間圧延を実施しようとすると、以下のような問題が生じる。
【０００４】
一般に、マンドレル・ミルを採用して熱間圧延で継目無鋼管を製造する場合、通常の搬送速度を維持すると、図４に示すように、延伸圧延機１であるマンドレル・ミルを約９５０℃で抜け出した一応の鋼管２は、再加熱炉３に装入されるまでの間に８００〜８５０℃程度に冷却され、その後再び９００〜１０００℃に加熱された後、絞り圧延機４であるストレッチ・レデューサで絞り圧延され、製品とされている。なお、図中の→は、鋼管の移動方向を意味している。このような設備配置の工程（以下、ラインという）で、温間での絞り圧延を実施しようとしても、再加熱炉３までの冷却が予定通り行なえない。つまり、鋼管の金属組織を希望通りにできないことになる。そのため、マンドレル・ミルから再加熱炉３までの搬送中に目標温度になるまで一時停止して待機させるか、あるいは一時的に搬送ラインから排出し、オフ・ラインで冷却してから再度搬送ラインに戻すようにしているのが現状である。
【０００５】
しかしながら、搬送の一時停止は、生産性を著しく阻害し、製造コストの上昇になる。また、オフ・ラインで冷却するのは、そのために鋼管をハンドリングする設備が別途必要になるし、また熟練度の高い作業員の確保が必要となる。
【０００６】
【発明が解決しようとする課題】
本発明は、かかる事情に鑑み、熱間圧延時の生産性を落とさずに効率良く温間圧延が可能な継目無鋼管の製造装置を提供することを目的としている。
【０００７】
【課題を解決するための手段】
発明者は、上記目的を達成するため鋭意研究を重ね、その成果を本発明に具現化した。
【０００８】
すなわち、本発明は、穿孔された鋼鋳片を熱間で一応の寸法に製管する延伸圧延機と、得られた鋼管を再度加熱する再加熱炉と、該再加熱炉から抽出した鋼管を絞り圧延する絞り圧延機と、該延伸圧延機と該再加熱炉との間を繋ぐ鋼管の搬送手段とを備えた継目無鋼管の製造装置において、前記延伸圧延機と前記再加熱炉との間の搬送手段に、立体方式であり、前記延伸圧延機と前記再加熱炉との間の搬送手段から受け取った鋼管を持ち上げる上昇手段と、持ち上げた鋼管を横方向へ水平に搬送する搬送手段と、該搬送手段の後端部で鋼管を下方へ降ろす下降手段と、下降した鋼管を前記と逆の横方向へ水平搬送する別の搬送手段と、該別の搬送手段の後端部より前記再加熱炉へ鋼管を装入する押出し機とを備えた、冷却能力が可変の冷却床を設けたことを特徴とする継目無鋼管の製造装置である。
【０００９】
この場合、前記再加熱炉の加熱能力が、鋼管温度で６００〜９００℃であるのが好ましい。また、前記冷却能力が可変の冷却床に、移動中の鋼管を冷却する冷媒を吹き付ける冷媒噴射ノズルを設けると一層好ましい。さらに、本発明では、前記冷媒が空気であったり、あるいは前記延伸圧延機がマンドレル・ミルであるのが良い。加えて、前記絞り圧延機がホット・ストレッチ・レデューサであったり、あるいは前記上昇手段の直前に、鋼管を冷却床へ搬送せずに再加熱炉へ送る搬送系路切替え手段を設けているのが好ましい。
【００１０】
本発明によれば、継目無鋼管を温間で絞り圧延するに際して、絞り圧延機の上流に設置された再加熱炉へ装入する前の該鋼管の冷却を適切に行なえるようになる。その結果、予め定めた目標通りの金属組織を有する鋼管になり、温間圧延の効果が達成される。また、延伸圧延機、再加熱炉及び絞り圧延機を通過する鋼管の搬送速度は、従来と同程度に維持できるので、生産性が熱間圧延を行う場合に比較して低下することもない。さらに、延伸圧延機からのまだ高温状態にある鋼管を冷却床へ送らずに、再加熱炉へ直接搬送できるようにもなっているので、従来通りの熱間絞り圧延も可能である。
【００１１】
【発明の実施の形態】
以下、発明をなすに至った経緯をまじえ、本発明の実施の形態を説明する。
【００１２】
まず、本発明者は、延伸圧延機で一応の形態に圧延され、９５０℃の高温状態にある継目無鋼管を、下流工程の再加熱炉及び絞り圧延機に搬送速度を落とさず、且つ所望の金属組織になるように適切に冷却するには、図４に示した熱間圧延工程に、十分な移動距離を有する鋼管の冷却床を別途設ける必要があると考えた。そして、製造する継目無鋼管は、種々の鋼種からなるばかりでなく、サイズも異なるので、該冷却床の冷却能力は、大小可変であることも必要であるとした。
【００１３】
そのような冷却床としては、小さなスペースでも良い立体的な冷却床とする。
【００１４】
例えば、その冷却床５は、図１に示すように、穿孔された鋼鋳片を熱間で一応の寸法に製管する延伸圧延機１と、得られた鋼管２を再度加熱する再加熱炉３と、該再加熱炉３から抽出した鋼管２を６００〜８５０℃の温度で絞り圧延する絞り圧延機４と、該延伸圧延機１と該再加熱炉３との間を繋ぐ鋼管の搬送手段６とを備えた継目無鋼管の製造装置において、前記延伸圧延機１と前記再加熱炉３との間に設けられる。そして、この冷却床５には、図２に示すように、立体的に、前記延伸圧延機１と前記再加熱炉３との間の搬送手段６から受け取った鋼管２を持ち上げる上昇手段７と、持ち上げた鋼管を横方向へ水平に搬送する搬送手段６と、該搬送手段６の後端部で鋼管２を下方へ降ろす下降手段８と、下降した鋼管２を前記と逆の横方向へ水平搬送する別の搬送手段６と、該別の搬送手段６の後端部より前記再加熱炉へ鋼管を装入する押出し機（図示せず、ただし、図中にＢで示す位置より、紙面に垂直な向こう側へ鋼管を押し出す）とを備えるようにした。つまり、冷却床のスペースが狭くても、該冷却床内での上昇、上段移動、下降及び下段移動で距離を稼ぐようにしたのである。このようにすれば、鋼管２が再加熱炉３へ到達するまでの時間を延長でき、その間に所望の冷却ができるからである。また、該冷却床５内の鋼管２の搬送速度を変更することで、前記到達時間も調整でき、冷却床５の冷却能力を可変にできるのである。この場合、冷却床５に、移動中の鋼管２を冷却する冷媒を吹き付ける冷媒噴射ノズル９をさらに設けると、冷却能力の可変範囲が広がるので、一層好ましい。
【００１５】
なお、本発明では、前記搬送手段６としては、種々の方式のものが利用できるが、鋼管２を軸方向へ直進させる際には、ローラ・コンベアを、横送りする際には、鋼管の軸と直交させて複数配置するスクリュウ列を利用すれば良い。また、鋼管２の前記上昇手段７、下降手段８及び押出し機には、ジャッキやシリンダ等を利用した押し上げ装置が利用できる。さらに、本発明では、前記延伸圧延機１としては、マンドレル・ミル、プラグ・ミル、リーラ等のいずれであっても良く、絞り圧延機４としては、ホット・ストレッチ・レデューサ、サイザーのいずれでも良い。
【００１６】
加えて、前記冷媒としては、不活性ガス、空気、水蒸気の水等が利用できるが、経済性を配慮して、本発明では空気の利用が好ましい。搬送速度の変更で冷却能力を変更できるので、常温の空気で十分の場合が多いからである。この場合、冷媒の量も特に限定しない。被冷却対象の種類、サイズ、搬送速度に応じて調整することになるからである。
【００１７】
さらに加えて、本発明では、前記上昇手段７の直前に、鋼管２を冷却床５へ搬送せずに再加熱炉４へ直接送る搬送系路切替え手段（図示せず）を設けるようにもした。この搬送系路切替え手段は、搬送されてきた鋼管の移動を停止させるストッパと、停止した鋼管を再加熱炉内へ装入する押出し機で形成すれば良い。これによって、本発明に係る温間圧延装置を従来通りの熱間絞り圧延にも利用できるようになる。なお、再加熱炉は、鋼管を６００〜９００℃に加熱する能力を有し、絞り圧延時には６００〜８５０℃で圧延が可能となるように設置されている。
【００１８】
【実施例】
鋼種０．３５質量％Ｃ，１．３質量％Ｍｎ鋼の鋼鋳片を１２５０℃に加熱してから、ピアサーで穿孔し、マンドレル・ミルで延伸圧延し、外径１７２ｍｍφ×肉厚１０ｍｍの継目無鋼管とした。そして、引き続き絞り圧延機で、製品となる外径（６０．５ｍｍφ）及び肉厚（９．５ｍｍ）に絞り圧延を行った。その際、本発明に係る図１及び図２に示した温間圧延装置を適用し、得られた結果を従来の装置を用いた場合と比較した。なお、従来の装置とは、図４に示した熱間絞り圧延を行なう装置であり、この場合には延伸圧延機からの高温の鋼管を既存のスクリュ・コンベア上で所定温度まで冷却（空冷）してから再度搬送系路に戻して再加熱炉３へ装入するようにした。また、絞り圧延機４としては、ロールスタンドを２８段に配置したホット・ストレッチ・レデューサを使用し、各段の圧下率を０〜１０％の範囲で調整している。さらに、再加熱炉３は、目的とする鋼管の温間や熱間での絞り圧延に対応させて、炉内雰囲気温度を調整した。
【００１９】
操業条件及び操業結果を表１に一括して示す。表１より、本発明によれば、生産性が飛躍的に向上し、継目無鋼管が製造できることが明らかである。また、図３に、本発明に係る装置を利用した場合の鋼管の温度推移を示すが、予定通りの温度推移が得られている。なお、図中のＷＤＭは、マンドレル・ミル、ＭＢＦは再加熱炉、ＨＳＲはホット・ストレッチ・レデューサを意味している。
【００２０】
【表１】

Figure 0003948275
【００２１】
【発明の効果】
以上述べたように、本発明により、継目無鋼管を温間で絞り圧延するに際して、絞り圧延機の上流に設置された再加熱炉へ装入する前の該鋼管の冷却を適切に行なえるようになる。その結果、予め定めた目標通りの金属組織を有する鋼管になり、温間圧延の効果が達成される。また、延伸圧延機、再加熱炉及び絞り圧延機を通過する鋼管の搬送速度は、従来と同程度に維持できるので、生産性が熱間圧延を行う場合に比較して低下することもない。さらに、延伸圧延機からのまだ高温状態にある鋼管を冷却床へ送らずに、再加熱炉へ直接搬送できるようにもなっているので、従来通りの熱間絞り圧延も可能となる。
【図面の簡単な説明】
【図１】本発明に係る継目無鋼管の製造装置の平面図である。
【図２】図１のＡ−Ａ矢視による縦断面図である。
【図３】本発明に係る継目無鋼管の製造装置の適用で得た鋼管の温度推移を示す図である。
【図４】継目無鋼管の熱間圧延装置の平面図である。
【符号の説明】
１ 延伸圧延機（マンドレル・ミル等）
２ 継目無鋼管（鋼管）
３ 再加熱炉
４ 絞り圧延機（ホット・ストレッチ・レデューサ等）
５ 冷却床
６ 搬送手段
７ 上昇手段
８ 下降手段
９ 冷却媒体噴射ノズル[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seamless steel pipe manufacturing apparatus, and more particularly to a technique that enables warm rolling to be performed more efficiently than before.
[0002]
[Prior art]
In recent years, a technology (called warm rolling) has been put into practical use in which seamless steel pipes used in oil well pipes, line pipes, etc. are drawn and drawn at a lower temperature of 600 to 850 ° C. using a stretch reducer or the like. ing. For example, Japanese Patent Application Laid-Open No. 5-70831 discloses that a hollow shell formed by hot rolling a steel piece is subjected to ferrite transformation in a heating furnace maintained at a temperature of 600 to 725 ° C. in order to obtain a high-strength seamless steel pipe. Has been proposed for a technique of performing drawing rolling at a temperature of 500 ° C. or more and a reduction ratio of 5 to 40% after heating for 80% or more. Japanese Patent Laid-Open No. 63-241117 discloses a technique for sequentially performing the following steps in order to obtain a martensitic stainless steel pipe excellent in toughness and stress corrosion cracking resistance.
a. The steel slab is heated to 1050 to 1250 ° C., drilled and rolled,
b. Cooling to at least 500 ° C. at a cooling rate of 30 ° C./min or more to a temperature not higher than the martensite transformation start temperature to obtain a metal structure in which 80% by volume or more is occupied by martensite
c. Reheating to a temperature of Ac 1 transformation point to (Ac 1 transformation point -200 ° C.), performing finish rolling at a cross-section reduction rate of 5% or more, and then air cooling or forced cooling.
[0003]
By the way, if it is going to implement the above-mentioned warm rolling in many seamless steel pipe manufacturing factories, the following problems arise.
[0004]
In general, when a seamless steel pipe is manufactured by hot rolling using a mandrel mill, if a normal conveying speed is maintained, the mandrel mill as the drawing mill 1 is maintained at about 950 ° C. as shown in FIG. The temporarily removed steel pipe 2 is cooled to about 800 to 850 ° C. before being charged into the reheating furnace 3, and then heated again to 900 to 1000 ° C. The product is drawn and rolled with a reducer. In addition, → in the figure means the moving direction of the steel pipe. Even if it is attempted to carry out warm drawing rolling in such a process of equipment arrangement (hereinafter referred to as a line), cooling to the reheating furnace 3 cannot be performed as scheduled. In other words, the metal structure of the steel pipe cannot be achieved as desired. For this reason, during transportation from the mandrel mill to the reheating furnace 3, it is temporarily stopped until it reaches the target temperature, or it is temporarily discharged from the transportation line, cooled off-line, and then returned to the transportation line. The current situation is to return it.
[0005]
However, the temporary stop of the conveyance significantly hinders productivity and increases the manufacturing cost. In addition, cooling off-line requires a separate facility for handling steel pipes, and it is necessary to secure highly skilled workers.
[0006]
[Problems to be solved by the invention]
In view of such circumstances, an object of the present invention is to provide a seamless steel pipe manufacturing apparatus capable of performing efficient hot rolling without reducing the productivity during hot rolling.
[0007]
[Means for Solving the Problems]
The inventor has intensively studied to achieve the above object, and the results have been embodied in the present invention.
[0008]
That is, the present invention comprises a drawing and rolling machine that pipes a punched steel slab into hot dimensions, a reheating furnace that reheats the obtained steel pipe , and a steel pipe extracted from the reheating furnace. and reducing mill rolling Ri aperture, the apparatus for manufacturing seamless steel pipe and a conveying means of a steel pipe connecting between the stretched mill and該再heating furnace, and the elongation rolling machine of the reheating furnace The conveying means is a three-dimensional system, a lifting means for lifting the steel pipe received from the conveying means between the drawing mill and the reheating furnace, and a conveying means for horizontally conveying the raised steel pipe horizontally A lowering means for lowering the steel pipe at the rear end portion of the conveying means, another conveying means for horizontally conveying the lowered steel pipe in the lateral direction opposite to the above, and the rear end portion of the other conveying means from the rear end portion. and a extruder is charged with steel tube to a heating furnace, cooling bed of the cooling capacity is variable It provided an apparatus for manufacturing a seamless steel pipe according to claim.
[0009]
In this case , it is preferable that the heating capacity of the reheating furnace is 600 to 900 ° C. at the steel pipe temperature . Further, it is more preferable that a refrigerant injection nozzle for blowing a refrigerant for cooling the moving steel pipe is provided on the cooling floor having a variable cooling capacity. Furthermore, in the present invention, it is preferable that the refrigerant is air, or the drawing mill is a mandrel mill. In addition, the drawing mill is a hot stretch reducer, or immediately before the ascending means is provided with a transfer system switching means for sending the steel pipe to the reheating furnace without transferring it to the cooling bed. preferable.
[0010]
According to the present invention, when a seamless steel pipe is hot-drawn, the steel pipe can be appropriately cooled before being charged into a reheating furnace installed upstream of the drawing mill. As a result, the steel pipe has a metal structure according to a predetermined target, and the effect of warm rolling is achieved. Moreover, since the conveyance speed of the steel pipe which passes through a drawing mill, a reheating furnace, and a drawing mill can be maintained at the same level as before, productivity does not decrease compared with the case where hot rolling is performed. Furthermore, since the steel pipe still in a high temperature state from the drawing mill can be directly conveyed to the reheating furnace without being sent to the cooling bed, the conventional hot drawing rolling is also possible.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below based on the circumstances leading to the invention.
[0012]
First, the present inventor does not reduce the conveyance speed of a seamless steel pipe that has been rolled into a temporary form by a drawing mill and is in a high temperature state of 950 ° C. to a reheating furnace and a drawing mill in a downstream process, and has a desired value. In order to cool appropriately so that it may become a metal structure, it was thought that it was necessary to provide the cooling floor of the steel pipe which has sufficient movement distance in the hot rolling process shown in FIG. And the seamless steel pipes to be manufactured are not only made of various steel types but also have different sizes, so that the cooling capacity of the cooling bed needs to be variable in size.
[0013]
As such a cooling bed, a good three-dimensional cooling bed in small spaces.
[0014]
For example, as shown in FIG. 1, the cooling bed 5 includes a drawing and rolling machine 1 that pipes a punched steel slab into a hot size, and a reheating furnace that reheats the obtained steel pipe 2. 3, a drawing mill 4 for drawing and rolling the steel pipe 2 extracted from the reheating furnace 3 at a temperature of 600 to 850 ° C., and a means for conveying the steel pipe connecting between the drawing mill 1 and the reheating furnace 3. 6 is provided between the drawing rolling mill 1 and the reheating furnace 3. And in this cooling bed 5, as shown in FIG. 2, ascending means 7 for lifting the steel pipe 2 received from the conveying means 6 between the drawing mill 1 and the reheating furnace 3 in three dimensions, Conveying means 6 for horizontally conveying the lifted steel pipe horizontally, descending means 8 for lowering the steel pipe 2 downward at the rear end of the conveying means 6, and horizontally conveying the lowered steel pipe 2 in the opposite lateral direction. And another extruder for charging the steel pipe into the reheating furnace from the rear end of the other conveyor means 6 (not shown, but perpendicular to the paper surface from the position indicated by B in the figure) The steel pipe is pushed out to the other side). In other words, even if the space of the cooling floor is small, the distance is gained by ascending, moving up, moving down, and moving down in the cooling bed. This is because the time until the steel pipe 2 reaches the reheating furnace 3 can be extended, and desired cooling can be performed during that time. Further, by changing the conveying speed of the steel pipe 2 in the cooling bed 5, the arrival time can be adjusted, and the cooling capacity of the cooling bed 5 can be made variable. In this case, it is more preferable to further provide the refrigerant injection nozzle 9 for blowing the refrigerant for cooling the moving steel pipe 2 on the cooling bed 5 because the variable range of the cooling capacity is widened.
[0015]
In the present invention, various types of transport means 6 can be used. However, when the steel pipe 2 is linearly moved in the axial direction, the roller conveyor is used when the steel pipe 2 is fed in the axial direction. A plurality of screw rows that are arranged perpendicular to each other may be used. In addition, a push-up device using a jack, a cylinder or the like can be used for the raising means 7, the lowering means 8 and the extruder of the steel pipe 2. Furthermore, in the present invention, the stretching mill 1 may be any of a mandrel mill, a plug mill, a reeler, and the like, and the drawing mill 4 may be any of a hot stretch reducer and a sizer. .
[0016]
In addition, as the refrigerant, an inert gas, air, water of steam, or the like can be used. However, in consideration of economy, the use of air is preferable in the present invention. This is because air at normal temperature is often sufficient because the cooling capacity can be changed by changing the conveyance speed. In this case, the amount of the refrigerant is not particularly limited. This is because the adjustment is made according to the type, size, and conveyance speed of the object to be cooled.
[0017]
In addition, in the present invention, immediately before the ascending means 7, there is also provided a transfer system switching means (not shown) for sending the steel pipe 2 directly to the reheating furnace 4 without transferring it to the cooling bed 5. . This transfer path switching means may be formed by a stopper that stops the movement of the steel pipe that has been transferred and an extruder that charges the stopped steel pipe into the reheating furnace. As a result, the warm rolling apparatus according to the present invention can be used for conventional hot drawing rolling. In addition, the reheating furnace has the capability to heat a steel pipe to 600-900 degreeC, and is installed so that rolling can be performed at 600-850 degreeC at the time of drawing rolling.
[0018]
【Example】
Steel slabs of 0.35 mass% C and 1.3 mass% Mn steel are heated to 1250 ° C, drilled with a piercer, stretch-rolled with a mandrel mill, and a seam with an outer diameter of 172 mmφ x wall thickness of 10 mm Steel-free pipes were used. Then, it was continuously drawn to a product with an outer diameter (60.5 mmφ) and a wall thickness (9.5 mm) using a drawing mill. At that time, the warm rolling apparatus shown in FIGS. 1 and 2 according to the present invention was applied, and the obtained results were compared with the case of using a conventional apparatus. In addition, the conventional apparatus is an apparatus which performs hot drawing rolling shown in FIG. 4, and in this case, a high-temperature steel pipe from a drawing mill is cooled to a predetermined temperature on an existing screw conveyor (air cooling). Then, it was returned to the conveyance system path again and charged into the reheating furnace 3. Further, as the drawing mill 4, a hot stretch reducer having 28 roll stands is used, and the rolling reduction of each stage is adjusted in the range of 0 to 10%. Furthermore, the reheating furnace 3 adjusted the furnace atmosphere temperature corresponding to the target steel pipe warm and hot drawing.
[0019]
Table 1 shows the operating conditions and results. From Table 1, it is clear that according to the present invention, productivity is dramatically improved and a seamless steel pipe can be manufactured. Moreover, although the temperature transition of the steel pipe at the time of utilizing the apparatus based on this invention is shown in FIG. 3, the temperature transition as planned is obtained. In the figure, WDM represents a mandrel mill, MBF represents a reheating furnace, and HSR represents a hot stretch reducer.
[0020]
[Table 1]
Figure 0003948275
[0021]
【The invention's effect】
As described above, according to the present invention, when a seamless steel pipe is hot-drawn, the steel pipe can be appropriately cooled before being charged into a reheating furnace installed upstream of the drawing mill. become. As a result, the steel pipe has a metal structure according to a predetermined target, and the effect of warm rolling is achieved. Moreover, since the conveyance speed of the steel pipe which passes through a drawing mill, a reheating furnace, and a drawing mill can be maintained at the same level as before, productivity does not decrease compared with the case where hot rolling is performed. Furthermore, since the steel pipe still in a high temperature state from the drawing mill can be directly conveyed to the reheating furnace without being sent to the cooling bed, the conventional hot drawing rolling is also possible.
[Brief description of the drawings]
FIG. 1 is a plan view of a seamless steel pipe manufacturing apparatus according to the present invention.
2 is a longitudinal sectional view taken along arrow AA in FIG. 1. FIG.
FIG. 3 is a view showing a temperature transition of a steel pipe obtained by applying the seamless steel pipe manufacturing apparatus according to the present invention.
FIG. 4 is a plan view of a hot rolling apparatus for seamless steel pipes.
[Explanation of symbols]
1 Stretch rolling mill (mandrel mill, etc.)
2 Seamless steel pipe (steel pipe)
3 Reheating furnace 4 Drawing mill (hot, stretch, reducer, etc.)
5 Cooling bed 6 Conveying means 7 Lifting means 8 Lowering means 9 Cooling medium injection nozzle

Claims (6)

穿孔された鋼鋳片を熱間で一応の寸法に製管する延伸圧延機と、得られた鋼管を再度加熱する再加熱炉と、該再加熱炉から抽出した鋼管を絞り圧延する絞り圧延機と、該延伸圧延機と該再加熱炉との間を繋ぐ鋼管の搬送手段とを備えた継目無鋼管の製造装置において、
前記延伸圧延機と前記再加熱炉との間の搬送手段に、立体方式であり、前記延伸圧延機と前記再加熱炉との間の搬送手段から受け取った鋼管を持ち上げる上昇手段と、持ち上げた鋼管を横方向へ水平に搬送する搬送手段と、該搬送手段の後端部で鋼管を下方へ降ろす下降手段と、下降した鋼管を前記と逆の横方向へ水平搬送する別の搬送手段と、該別の搬送手段の後端部より前記再加熱炉へ鋼管を装入する押出し機とを備えた、冷却能力が可変の冷却床を設けたことを特徴とする継目無鋼管の製造装置。A drawing rolling machine that pipes a punched steel slab into a hot size, a reheating furnace that reheats the obtained steel pipe, and a drawing mill that draw-rolls the steel pipe extracted from the reheating furnace And a seamless steel pipe manufacturing apparatus comprising a steel pipe conveying means for connecting between the drawing mill and the reheating furnace,
Ascending means for lifting the steel pipe received from the conveying means between the drawing and rolling mill and the reheating furnace is a three-dimensional system for the conveying means between the drawing and rolling mill and the reheating furnace, and the lifted steel pipe Conveying means for horizontally conveying the steel pipe, a lowering means for lowering the steel pipe downward at the rear end of the conveying means, another conveying means for horizontally conveying the lowered steel pipe in the horizontal direction opposite to the above, and An apparatus for producing a seamless steel pipe, comprising a cooling bed having a variable cooling capacity , comprising an extruder for charging the steel pipe into the reheating furnace from the rear end of another conveying means . 前記再加熱炉の加熱能力が、鋼管温度で６００〜９００℃であることを特徴とする請求項１記載の継目無鋼管の製造装置。  The apparatus for producing a seamless steel pipe according to claim 1, wherein the heating capacity of the reheating furnace is 600 to 900 ° C at a steel pipe temperature. 前記冷却能力が可変の冷却床に、移動中の鋼管を冷却する冷媒を吹き付ける冷媒噴射ノズルを設けたことを特徴とする請求項１又は２記載の継目無鋼管の製造装置。The apparatus for manufacturing a seamless steel pipe according to claim 1 or 2, wherein a coolant injection nozzle for spraying a coolant for cooling the moving steel pipe is provided on the cooling floor having a variable cooling capacity. 前記延伸圧延機がマンドレル・ミルであることを特徴とする請求項１〜３のいずれかに記載の継目無鋼管の製造装置。The apparatus for producing a seamless steel pipe according to any one of claims 1 to 3, wherein the drawing mill is a mandrel mill . 前記絞り圧延機がホット・ストレッチ・レデューサであることを特徴とする請求項１〜４のいずれかに記載の継目無鋼管の製造装置。The apparatus for producing a seamless steel pipe according to any one of claims 1 to 4, wherein the drawing mill is a hot stretch reducer . 前記上昇手段の直前に、鋼管を冷却床へ搬送せずに再加熱炉へ送る搬送系路切替え手段を設けたことを特徴とする請求項１〜５のいずれかに記載の継目無鋼管の製造装置。The production of a seamless steel pipe according to any one of claims 1 to 5, further comprising a transfer system switching means for sending a steel pipe to a reheating furnace without transferring the steel pipe to a cooling bed immediately before the raising means. apparatus.
JP2001396503A 2001-12-27 2001-12-27 Seamless steel pipe manufacturing equipment Expired - Fee Related JP3948275B2 (en)

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