JP5532637B2 - Thick steel plate temperature guarantee system and thick steel plate manufacturing method - Google Patents
Thick steel plate temperature guarantee system and thick steel plate manufacturing method Download PDFInfo
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- 238000005096 rolling process Methods 0.000 claims description 40
- 238000009529 body temperature measurement Methods 0.000 claims description 24
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- 239000000498 cooling water Substances 0.000 description 1
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- 238000010008 shearing Methods 0.000 description 1
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Description
本発明は、厚鋼板製造ラインにおける鋼板の温度保証システムおよびそれを用いて形状に優れた厚鋼板を製造する方法に関し、特に制御圧延や加速冷却される厚鋼板の全面の材質保証用として好適なものに関する。 The present invention relates to a temperature guarantee system for a steel plate in a thick steel plate production line and a method for producing a thick steel plate having an excellent shape using the system, and is particularly suitable for guaranteeing the quality of the entire surface of a thick steel plate to be controlled or accelerated. About things.
ミクロ組織を結晶粒径が１μｍ程度の微細組織として鋼板の強度・靭性を向上させるＴＭＣＰを用いて材質を制御する鋼板や、内部応力を制御して反りなどの変形の少ない鋼板を製造するためには、制御圧延の開始温度、終了温度、加速冷却の冷却開始温度、冷却停止温度を厳密に管理することが必要とされるため、鋼板温度を精度良く測定する測定方法や、温度計の配置を工夫した冷却設備が種々提案されている。 To manufacture steel sheets that control the material using TMCP, which improves the strength and toughness of the steel sheet by making the microstructure into a fine structure with a crystal grain size of about 1 μm, and steel sheets with less deformation such as warpage by controlling internal stress Since it is necessary to strictly control the start temperature and end temperature of controlled rolling, the cooling start temperature of accelerated cooling, and the cooling stop temperature, a measuring method for accurately measuring the steel sheet temperature and the arrangement of thermometers are required. Various devised cooling facilities have been proposed.
特許文献１は、熱間圧延鋼板の冷却制御装置に関し、冷却時における板巾方向反りによる形状不良を防止するため、鋼板温度を測定して、冷却装置の上下に配設されている各ノズルからの冷却水量や冷却開始、終了を厳格に制御することおよび仕上げ圧延機の後面、冷却装置の前後面、および内部に光ファイバー温度計を配置することが記載されている。 Patent Document 1 relates to a cooling control device for hot-rolled steel plates, and in order to prevent shape defects due to warpage in the plate width direction during cooling, the steel plate temperature is measured, and from each nozzle disposed above and below the cooling device. The amount of cooling water and the start and end of cooling are strictly controlled, and optical fiber thermometers are arranged on the rear surface of the finishing mill, front and rear surfaces of the cooling device, and inside.
特許文献２は、制御冷却鋼板の形状制御方法に関し、加速冷却鋼板の常温冷却後形状を冷却直後形状と鋼板温度履歴とから推定し、次材の形状を確保することおよび加速冷却装置の内部に鋼板表裏面温度測定温度計、直後に鋼板表面温度分布計（サーモトレーサ）と鋼板表面温度計を配置することが記載されている。 Patent Document 2 relates to a shape control method for a controlled cooling steel plate, and estimates the shape after cooling at normal temperature of the accelerated cooling steel plate from the shape immediately after cooling and the steel plate temperature history, and secures the shape of the next material and the inside of the accelerated cooling device. It describes that a steel plate front and back surface temperature measuring thermometer, and immediately after that a steel plate surface temperature distribution meter (thermotracer) and a steel plate surface thermometer are arranged.
特許文献３は、厚鋼板冷却方法に関し、鋼板形状の平坦度向上と材質の均一化を図るため、仕上げ圧延後、デスケまたは表面膜塗布によりスケール厚みのバラツキを１０μｍ以下として、制御冷却することおよび制御冷却装置の前に鋼板表面温度計として放射温度計を配置することが記載されている。 Patent Document 3 relates to a method for cooling a thick steel plate, and in order to improve the flatness of the steel plate shape and make the material uniform, after finishing rolling, the thickness of the scale thickness is 10 μm or less by deske or surface film coating, and controlled cooling, and It is described that a radiation thermometer is arranged as a steel plate surface thermometer in front of the control cooling device.
ところで、最近、製造条件変動に対する材質敏感性が高い高Ｎｉ鋼を直接焼入れ法で製造したり、合理化のためＴＭＣＰの適用対象が拡大することにより、ユーザから製品の板全面の材質保証が要求されることが増加し、寸法形状への要求も厳しくなっている。 By the way, recently, high-Ni steel, which has high material sensitivity to fluctuations in manufacturing conditions, is manufactured by the direct quenching method, and TMCP has been applied to increase the rationalization of the product. The demand for dimensional shape has become stricter.
厚鋼板は連続式加熱炉、デスケデバイス、冷却設備等の操業条件により板厚方向や板面内の温度分布が不均一となりやすく、その結果、材質も不均一で、寸法形状も劣化しやすい。 Thick steel plates tend to have non-uniform temperature distribution in the thickness direction and in the plate surface due to operating conditions such as continuous heating furnaces, deske devices, and cooling equipment, resulting in non-uniform materials and dimensional shapes. .
材質不均一を解消するための対策として、例えば、搬送ラインの上方に取り付けた放射温度計により、鋼板の温度を測定し、その測定温度が管理温度範囲に入っている場合、品質判定合格とし、外れている場合、品質判定不合格とすることが行われていた。 As a measure to eliminate material non-uniformity, for example, measure the temperature of the steel sheet with a radiation thermometer attached above the transfer line, and if the measured temperature is within the control temperature range, pass the quality judgment, If it is off, the quality judgment has been rejected.
しかしながら、上記放射温度計による温度測定結果を用いた品質判定は、搬送ライン幅方向中央の上面に取り付けた放射温度計により、鋼板の幅方向中央部の温度を測定し、その測定温度と各管理温度範囲を対比させるもので、品質判定も中央の温度のみで実施するため、中央部以外の材質保証は、不十分であった。 However, the quality judgment using the temperature measurement result by the above radiation thermometer measures the temperature of the central part in the width direction of the steel sheet with the radiation thermometer attached to the upper surface in the center of the conveyance line width direction, and the measured temperature and each control. Since the temperature range is contrasted and the quality judgment is also performed only at the center temperature, the material guarantee other than the center portion is insufficient.
更に、大板の、圧延方向のトップ、ミドル、エンドの各位置から採取した試験片で各種の材料試験を実施する方法は、当該鋼板の圧延及び剪断後、数日を要するため、パイプ材など同一製造条件で大量に製造する場合、大量不適合が発生する場合もあった。 Furthermore, the method of performing various material tests on test pieces taken from the top, middle, and end positions in the rolling direction of a large plate requires several days after rolling and shearing the steel plate. In the case of mass production under the same production conditions, mass incompatibility may occur.
また、鋼板幅方向や鋼板長さ方向の中央部での温度測定のみでは、温度むらの実績評価が出来ないため、温度むらを発生させる加熱炉、圧延機、および冷却設備の制御が十分できなかった。 In addition, it is not possible to sufficiently control the heating furnace, rolling mill, and cooling equipment that generate temperature unevenness because it is not possible to evaluate the results of temperature unevenness only by measuring the temperature at the central part in the width direction or length direction of the steel sheet. It was.
そこで、本発明は、厚鋼板の製造ラインで鋼板温度を測定する温度計を適切に配置することにより、厚鋼板の板厚方向および板面内の材質均一性と寸法形状を向上させる操業管理が可能な、厚鋼板の温度保証システムおよびそれを用いた厚鋼板の製造方法を提供することを目的とする。 In view of this, the present invention provides an operational management for improving the material uniformity and dimensional shape in the plate thickness direction and the plate surface of the thick steel plate by appropriately arranging a thermometer for measuring the steel plate temperature in the thick steel plate production line. An object of the present invention is to provide a thick steel plate temperature guarantee system and a method for producing a thick steel plate using the same.
本発明の課題は以下の手段により達成可能である。
１．仕上げ圧延機と当該仕上げ圧延機の下流側の搬送ライン上に配置された冷却装置を備えた厚鋼板製造ラインにおいて前記仕上げ圧延機の前後と、前記冷却装置の前後で鋼板温度を測定する温度測定手段と、前記鋼板温度測定手段で測定された鋼板温度を解析する温度実績解析手段を備えた厚鋼板の温度保証システムであって、
前記温度測定手段は、前記仕上げ圧延機の前面にはスポット型放射温度計を、前記仕上げ圧延機の後面および前記冷却装置の前後面にはスポット型放射温度計と走査型放射温度計を前記搬送ラインの上方に配置し、前記搬送ラインの下方には、これらスポット型放射温度計と走査型放射温度計の、搬送ラインを挟んで対向する位置に、スポット型ファイバー温度計を配置し、前記走査型放射温度計と対向する位置に配置される前記スポット型ファイバー温度計は、前記走査型放射温度計の走査方向に複数台適宜の間隔で配置され、前記温度実績解析手段は、前記温度測定手段で計測された温度から鋼板温度を求めることを特徴とする厚鋼板の温度保証システム。
２．前記冷却装置の後面にはスポット型放射温度計と、走査型放射温度計をそれぞれ複数台配置し、前記冷却装置の後面に配置するスポット型放射温度計と走査型放射温度計は、それぞれ高温度域測定用と低温度域測定用の複数台であることを特徴とする１記載の厚鋼板の温度保証システム。
３．１または２記載の厚鋼板の温度保証システムで測定した鋼板温度分布をもとに、次材の製造で加熱炉、圧延機または冷却設備の少なくとも一つの設備の操業条件を制御して形状不良を防止することを特徴とする厚鋼板の製造方法。
４．形状不良を防止するため、加熱炉において、加熱炉内の上下温度または上下ガス流量比の少なくとも一つを制御することを特徴とする３記載の厚鋼板の製造方法。
５．形状不良を防止するため、圧延機において、上下ロールの周速またはデスケーリング水量の少なくとも一つを制御することを特徴とする３記載の厚鋼板の製造方法。
６．形状不良を防止するため、冷却設備において、板幅方向もしくは板長方向の水量または上下水量比の少なくとも一つを制御することを特徴とする３記載の厚鋼板の製造方法。
The object of the present invention can be achieved by the following means.
1. Temperature measurement for measuring steel plate temperature before and after the finish rolling mill and before and after the cooling device in a thick steel plate production line equipped with a finish rolling mill and a cooling device arranged on a conveyance line downstream of the finishing mill. And a temperature assurance system for a thick steel plate provided with temperature performance analysis means for analyzing the steel sheet temperature measured by the steel sheet temperature measuring means,
The temperature measuring means transports a spot-type radiation thermometer on the front surface of the finishing mill, and a spot-type radiation thermometer and a scanning radiation thermometer on the rear surface of the finishing mill and on the front and rear surfaces of the cooling device. A spot-type fiber thermometer is arranged above the line, and a spot-type fiber thermometer is arranged below the carrier line at a position where the spot-type radiation thermometer and the scanning radiation thermometer are opposed to each other across the carrier line. A plurality of the spot type fiber thermometers arranged at a position facing the type radiation thermometer are arranged at appropriate intervals in the scanning direction of the scanning radiation thermometer, and the temperature performance analysis means is the temperature measurement means A temperature assurance system for thick steel sheets, characterized in that the steel sheet temperature is obtained from the temperature measured in step (1).
2. A plurality of spot type radiation thermometers and a plurality of scanning type radiation thermometers are arranged on the rear surface of the cooling device, respectively, and the spot type radiation thermometer and the scanning radiation thermometer arranged on the rear surface of the cooling device each have a high temperature. 2. The temperature assurance system for thick steel plates according to 1, wherein the temperature assurance system includes a plurality of units for measuring a region and for measuring a low temperature region.
Based on a steel plate temperature distribution measured at 3.1 or 2 steel plate temperature assurance system according, to control the operating conditions of one equipment furnace in the manufacture of the next material, even without less of the rolling mill or cooling equipment A method of manufacturing a thick steel plate characterized by preventing shape defects.
4). To prevent defective shape, in the heating furnace, the upper and lower temperature Doma other in the heating furnace method of manufacturing a steel plate of 3, wherein the controlling at least one of the upper and lower gas flow rate.
5. To prevent defective shape, in the rolling machine, 3 steel plate manufacturing method according to, characterized in that the Hayama periphery of the upper and lower rolls to control at least one descaling water amount.
6). To prevent defective shape, in the cooling equipment, the production method of the steel plate of 3, wherein the controlling at least one of water or the upper and lower water volume ratio in the plate width direction or Itacho direction.
本発明によれば、仕上げ圧延後、加速冷却や直接焼入れされる厚鋼板の材質および形状を全面に亘って保証することが可能となる。また、圧延直後に全面の温度合否を判定できるため、次材以降の鋼板の温度をコントロールすることで大量不適合の発生を防止することが可能で産業上極めて有用である。 According to the present invention, it is possible to guarantee the material and shape of the thick steel plate that is subjected to accelerated cooling or directly quenched after finish rolling. Moreover, since it is possible to determine whether or not the temperature of the entire surface is right after rolling, it is possible to prevent the occurrence of mass nonconformity by controlling the temperature of the subsequent steel plates, which is extremely useful in the industry.
本発明に係る温度保証システムは、温度測定手段と温度実績解析手段を有する。製造ラインにおいて厚鋼板の全面の温度を測定することは技術的に困難なため、本発明で温度測定手段は温度計として、搬送ラインの上方にはスポット型放射温度計と走査型放射温度計を、下方には、スポット型ファイバー温度計、例えば光ファイバーを用いたスポット型放射温度計（以降、光ファイバー放射温度計）を用い、複数の温度計で測定した温度を収集するためパーソナルコンピューター（以降、ＰＣ）を用いる。 The temperature assurance system according to the present invention includes a temperature measurement unit and a temperature performance analysis unit. Since it is technically difficult to measure the temperature of the entire surface of the thick steel plate in the production line, the temperature measuring means is a thermometer in the present invention, and a spot type radiation thermometer and a scanning type radiation thermometer are provided above the conveyance line. Below, a spot type fiber thermometer, for example, a spot type radiation thermometer using an optical fiber (hereinafter referred to as an optical fiber radiation thermometer) is used, and a personal computer (hereinafter referred to as a PC) is used to collect the temperature measured by a plurality of thermometers. ) Is used.
本発明では、上記温度計を適宜組み合わせて、製造ライン上で全面の温度履歴を保証するために最低限必要な温度測定位置を１．仕上げ圧延機の前後面および２．冷却装置の前後面として温度計を配置する。鋼板の上下面の温度差が著しい場合、上下面の材質特性が異なることが考えられるため、温度は上下面で測定する。 In the present invention, the above-mentioned thermometers are appropriately combined, and the minimum temperature measurement position required for guaranteeing the temperature history of the entire surface on the production line is 1. 1. Front and rear faces of finish rolling mill and Thermometers are arranged as front and rear surfaces of the cooling device. When the temperature difference between the upper and lower surfaces of the steel sheet is significant, the material properties of the upper and lower surfaces may be different. Therefore, the temperature is measured on the upper and lower surfaces.
尚、本発明で仕上げ圧延機前（後）面に温度計を設置するとは、仕上げ圧延機の前（後）方直近に、他の機器より仕上げ圧延機に近い場所に温度計を配置することを意味する。冷却装置の場合も同様とする。 In the present invention, the installation of a thermometer on the front (rear) surface of the finish rolling mill means that the thermometer is placed closer to the front of the finish rolling mill and closer to the finishing mill than other equipment. Means. The same applies to the cooling device.
スポット型放射温度計は、搬送ラインの上方で、仕上げ圧延機の前後面と、冷却装置の前後面に配置する。 The spot-type radiation thermometers are arranged on the front and rear surfaces of the finish rolling mill and the front and rear surfaces of the cooling device above the transport line.
仕上げ圧延機の前後面に配置するスポット型放射温度計は、複数台とすることが望ましい。１台の場合に発生する温度計異常時のミル停止を防止したり、大量に生産するラインパイプ材の製造の際の測定温度の信頼性を向上させることができる。複数台の配置位置は特に規定しないが、搬送方向に並べることが望ましい。 It is desirable that a plurality of spot type radiation thermometers be arranged on the front and rear surfaces of the finish rolling mill. It is possible to prevent the mill from being stopped when a single thermometer occurs and to improve the reliability of the measured temperature when manufacturing a line pipe material to be produced in large quantities. The arrangement position of the plurality of units is not particularly defined, but it is desirable to arrange them in the transport direction.
冷却装置の前後面に配置するスポット型放射温度計は、前面を単数、後面は高温測定用と低温測定用の２仕様の複数台とする。 The spot type radiation thermometer to be arranged on the front and rear surfaces of the cooling device has a single front surface and a rear surface of a plurality of units with two specifications for high temperature measurement and low temperature measurement.
冷却装置では冷却停止温度６００℃前後の加速冷却や冷却停止温度が室温以下となる直接焼入れなど、冷却停止温度が低温から高温までの広範囲に変動するため、温度測定も広範囲の測定が必要となる。 In the cooling device, the cooling stop temperature fluctuates in a wide range from low to high, such as accelerated cooling at a cooling stop temperature of around 600 ° C and direct quenching where the cooling stop temperature is below room temperature. .
低温から高温（１００〜７００℃程度）までの広範囲の温度測定では温度計の分解能（±５℃）が確保できない。そのため、最低限として、高温測定用と低温測定用の２仕様の温度計を設置する必要がある。冷却装置に近い側には高温測定用、離れた側には低温測定用を配置する。 In a wide range of temperature measurement from low temperature to high temperature (about 100 to 700 ° C.), the resolution of the thermometer (± 5 ° C.) cannot be secured. Therefore, as a minimum, it is necessary to install two specification thermometers for high temperature measurement and low temperature measurement. A high temperature measurement is arranged on the side close to the cooling device, and a low temperature measurement is arranged on the remote side.
走査型放射温度計は、搬送ラインの上方で、仕上げ圧延機の後面と、冷却装置の前後面に、鋼板の幅方向を走査するように、搬送ラインの幅方向を走査方向として配置する。好ましくはスポット型放射温度計と近接して配置する。 A scanning radiation thermometer arranges the width direction of a conveyance line as a scanning direction so that the width direction of a steel plate may be scanned above the conveyance line on the rear surface of the finish rolling mill and the front and rear surfaces of the cooling device. Preferably, it is arranged close to the spot type radiation thermometer.
仕上げ圧延機の後面で測定される圧延仕上げ温度と、冷却装置の前後面で測定される鋼板温度は、材質に及ぼす影響が大きいため、鋼板幅方向に測定して材質均一性を保証する。 Since the rolling finishing temperature measured on the rear surface of the finish rolling mill and the steel plate temperature measured on the front and rear surfaces of the cooling device have a great influence on the material, it is measured in the width direction of the steel plate to ensure material uniformity.
光ファイバー放射温度計は、搬送ラインの下方に配置する。水及び水蒸気等により環境が悪く、全面の温度を測定する走査型の放射温度計を設置することができない。特に仕上げ圧延機の直近の下流側にＣＲシャワーに設置した場合、仕上げ圧延機の後面において温度計測の環境は悪化する。 The optical fiber radiation thermometer is disposed below the transport line. The environment is bad due to water, water vapor, etc., and a scanning radiation thermometer that measures the temperature of the entire surface cannot be installed. In particular, when the CR shower is installed immediately downstream of the finish rolling mill, the temperature measurement environment deteriorates on the rear surface of the finish rolling mill.
そのため、搬送ラインの下方には光ファイバーを用いたスポット型放射温度計（以降、光ファイバー放射温度計）を配置する。 Therefore, a spot type radiation thermometer using an optical fiber (hereinafter referred to as an optical fiber radiation thermometer) is disposed below the transport line.
光ファイバー放射温度計は、仕上げ圧延機の前後面や冷却装置の前後面に配置するスポット型放射温度計の、搬送ラインの下方で、搬送ラインを挟んで、対向する位置に配置する。 The optical fiber radiation thermometer is arranged at a position opposite to the spot type radiation thermometer arranged on the front and rear surfaces of the finish rolling mill and the front and rear surfaces of the cooling device with the conveyance line interposed therebetween.
また、仕上げ圧延機の後面や冷却装置の前後面に配置する走査型放射温度計の搬送ラインの下方で、搬送ラインを挟んで、対向する位置に、走査型放射温度計の走査方向に沿って複数台を配置する。 In addition, along the scanning direction of the scanning radiation thermometer, at the opposite position across the transportation line, below the transportation line of the scanning radiation thermometer arranged on the rear surface of the finishing mill and on the front and rear surfaces of the cooling device Arrange multiple units.
光ファイバー放射温度計は数が多いほど、幅方向の温度分布を定量的に把握できるが、コスト及びメンテナンスの観点より、１箇所／ｍの間隔が最低限となる。尚、スポット型放射温度計に対向して光ファイバー放射温度計を配置する場合、搬送ラインの幅方向に複数台を配置することが望ましい。 As the number of optical fiber radiation thermometers increases, the temperature distribution in the width direction can be quantitatively grasped. However, from the viewpoint of cost and maintenance, the interval of 1 place / m is the minimum. In addition, when arrange | positioning an optical fiber radiation thermometer facing a spot type | mold radiation thermometer, it is desirable to arrange several units | sets in the width direction of a conveyance line.
図１に、上述した鋼板温度測定手段を備えた本発明に係る温度測定システムの概要を示す。図において、１は加熱炉、２は仕上げ圧延機、３は鋼板、４はＣＲシャワー、５は冷却装置、６、６ａ，６ｂ，６ｃ，６ｄは走査型放射温度計で、６ｃは高温測定用、６ｄは低温測定用、７，７ａ，７ｂ，７ｃ，７ｄは光ファイバー放射温度計で７ｃは高温測定用、７ｄは低温測定用、８は制御圧延開始温度、仕上温度収集ＰＣ，９は冷却開始温度収集ＰＣ，１０は冷却停止温度収集ＰＣ、１１、１１ａは温度実績解析ＰＣを示す。但し、図ではスポット型放射温度計は省略した。
In FIG. 1, the outline | summary of the temperature measurement system which concerns on this invention provided with the steel plate temperature measurement means mentioned above is shown. In the figure, 1 is a heating furnace, 2 is a finish rolling mill, 3 is a steel plate, 4 is a CR shower, 5 is a cooling device, 6, 6a, 6b, 6c and 6d are scanning radiation thermometers, and 6c is for high temperature measurement. , 6d for low temperature measurement, 7, 7a, 7b, 7c, 7d for optical fiber radiation thermometer, 7c for high temperature measurement, 7d for low temperature measurement, 8 for controlled rolling start temperature, finishing temperature collection PC, 9 for cooling start
厚鋼板の製造ラインは、加熱炉１、仕上げ圧延機２、ＣＲシャワー４および冷却装置５を備え、図は鋼板３が、仕上げ圧延機２とＣＲシャワー４の間に位置している状態を示す。 The thick steel plate production line includes a heating furnace 1, a finish rolling mill 2, a CR shower 4 and a cooling device 5, and the figure shows a state in which the steel plate 3 is located between the finishing mill 2 and the CR shower 4. .
仕上げ圧延機の前後面に配置されたスポット型放射温度計（図では略）、後面に配置された走査型放射温度計６ａと光ファイバー放射温度計７ａで構成された鋼板温度測定手段で測定された温度は、制御圧延開始温度、仕上温度収集ＰＣ８に取り込まれる。 It was measured by a spot-type radiation thermometer (not shown) arranged on the front and rear surfaces of the finish rolling mill, and a steel plate temperature measuring means composed of a scanning radiation thermometer 6a and an optical fiber radiation thermometer 7a arranged on the rear surface. The temperature is taken into the control rolling start temperature and the finishing temperature collection PC8.
冷却装置５の前面に配置されたスポット型放射温度計（図では略）と走査型放射温度計６ｂと光ファイバー放射温度計７ｂで測定された温度は、冷却開始温度収集ＰＣ９に取り込まれる。
The temperatures measured by the spot type radiation thermometer (not shown), the scanning
冷却装置５の後面に配置されたスポット型放射温度計（図では略）、と走査型放射温度計６ｃ、６ｄと光ファイバー放射温度計７ｃ、７ｄで構成された鋼板温度測定手段で測定された温度は、冷却停止温度収集ＰＣ１０に取り込まれる。
Temperature measured by a steel plate temperature measuring means composed of a spot type radiation thermometer (not shown in the figure), a scanning
制御圧延開始温度、仕上温度収集ＰＣ８、冷却開始温度収集ＰＣ９および冷却停止温度収集ＰＣ１０は、各々表面温度収集ＰＣ１３と裏面温度収集ＰＣ１２で構成され、鋼板表面温度と裏面温度のそれぞれが、温度実績解析ＰＣ１１ａに取り込まれる。
Control rolling start temperature, finishing temperature collection PC8, cooling start temperature collection PC9, and cooling stop temperature collection PC10 are each composed of a surface temperature collection PC13 and a back surface temperature collection PC12, and each of the steel plate surface temperature and the back surface temperature is a temperature performance analysis. It is taken into the
実機生産においては、操業管理温度（制御圧延開始温度、鋼板仕上げ温度、冷却開始温度、冷却停止温度）範囲と温度実績解析ＰＣ１１ａに取り込まれた温度測定実績を比較し、品質判定を実施することで、全面の材質を保証する。
In actual machine production, by comparing the operation management temperature (control rolling start temperature, steel plate finishing temperature, cooling start temperature, cooling stop temperature) range and the temperature measurement results taken in the temperature
図２は図１に示した温度測定手段を用いて、寸法形状に優れた厚鋼板を製造する方法を説明する図で、圧延機２、冷却装置５の直近の下流側において鋼板上面、下面の温度を、走査型表面温度計６、光ファイバー放射温度計７で測定する例を示している。
FIG. 2 is a diagram for explaining a method for producing a thick steel plate having excellent dimensions using the temperature measuring means shown in FIG. 1, and the upper and lower surfaces of the steel plate on the downstream side closest to the rolling mill 2 and the cooling device 5. An example in which the temperature is measured by a
裏面温度収集ＰＣ１２、表面温度収集ＰＣ１３および温度実績解析ＰＣ１１ａは、測定された温度から、鋼板上面、下面における温度分布を求める。 The back surface temperature collection PC12, the surface temperature collection PC13, and the temperature performance analysis PC11a obtain the temperature distribution on the upper and lower surfaces of the steel sheet from the measured temperatures.
圧延機２、冷却装置５の直近の下流側には歪計（鋼板の寸法形状測定装置）を設置して、鋼板の寸法形状を測定し、良好な寸法形状が得られる温度分布を予め求めておく。 A strain gauge (steel plate dimension / shape measuring device) is installed on the downstream side of the rolling mill 2 and the cooling device 5 to measure the dimension / shape of the steel sheet, and obtain a temperature distribution in which a good dimension shape is obtained in advance. deep.
実製造では、まず、圧延機２、冷却装置５の下流側における温度分布を求める。当該温度分布が良好な寸法形状が得られる場合の温度分布と相違する場合、次材の製造で、加熱炉、圧延機２、ＣＲシャワー４および冷却装置５の操業条件を調整する。 In actual production, first, the temperature distribution on the downstream side of the rolling mill 2 and the cooling device 5 is obtained. When the temperature distribution is different from the temperature distribution when a good dimensional shape is obtained, the operating conditions of the heating furnace, the rolling mill 2, the CR shower 4 and the cooling device 5 are adjusted in the production of the next material.
加熱炉では、加熱炉内の上下温度および／または上下ガス流量比、圧延機２では、上下ロールの周速および／またはデスケーリング水量、ＣＲシャワー４、冷却装置５では、板幅方向、板長方向の水量または上下水量比の少なくとも一つを制御する。 In the heating furnace, the upper and lower temperature and / or upper and lower gas flow ratio in the heating furnace, in the rolling mill 2, the peripheral speed and / or the descaling water amount of the upper and lower rolls, in the CR shower 4 and the cooling device 5, the plate width direction, the plate length Control at least one of the directional water quantity or the water quantity ratio.
本発明によれば、材料試験不合格率が０．０８％から０．０６％に低下し、反り修正時間が２０％低減し、鋼板の形状不良が１０％抑止されるなどの効果が得られる。 According to the present invention, the material test failure rate is reduced from 0.08% to 0.06%, the warp correction time is reduced by 20%, and the effect of suppressing the shape failure of the steel sheet by 10% is obtained. .
１ 加熱炉
２ 仕上げ圧延機
３ 鋼板
４ ＣＲシャワー
５ 冷却装置
６、６ａ，６ｂ，６ｃ，６ｄ 走査型放射温度計
７，７ａ，７ｂ，７ｃ，７ｄ 光ファイバー放射温度計
８ 制御圧延開始温度、仕上温度収集ＰＣ
９ 冷却開始温度収集ＰＣ
１０ 冷却停止温度収集ＰＣ
１１、１１ａ 温度実績解析ＰＣ
１２ 裏面温度収集ＰＣ
１３ 表面温度収集ＰＣ
DESCRIPTION OF SYMBOLS 1 Heating furnace 2 Finish rolling mill 3 Steel plate 4 CR shower 5
9 Cooling start temperature collection PC
10 Cooling stop temperature collection PC
11, 11a Temperature performance analysis PC
12 Backside temperature collection PC
13 Surface temperature collection PC
Claims (6)
前記温度測定手段は、前記仕上げ圧延機の前面にはスポット型放射温度計を、前記仕上げ圧延機の後面および前記冷却装置の前後面にはスポット型放射温度計と走査型放射温度計を前記搬送ラインの上方に配置し、前記搬送ラインの下方には、これらスポット型放射温度計と走査型放射温度計の、搬送ラインを挟んで対向する位置に、スポット型ファイバー温度計を配置し、前記走査型放射温度計と対向する位置に配置される前記スポット型ファイバー温度計は、前記走査型放射温度計の走査方向に複数台適宜の間隔で配置され、前記温度実績解析手段は、前記温度測定手段で計測された温度から鋼板温度を求めることを特徴とする厚鋼板の温度保証システム。 Temperature measurement for measuring steel plate temperature before and after the finish rolling mill and before and after the cooling device in a thick steel plate production line equipped with a finish rolling mill and a cooling device arranged on a conveyance line downstream of the finishing mill. And a temperature assurance system for a thick steel plate provided with temperature performance analysis means for analyzing the steel sheet temperature measured by the steel sheet temperature measuring means,
The temperature measuring means transports a spot-type radiation thermometer on the front surface of the finishing mill, and a spot-type radiation thermometer and a scanning radiation thermometer on the rear surface of the finishing mill and on the front and rear surfaces of the cooling device. A spot-type fiber thermometer is arranged above the line, and a spot-type fiber thermometer is arranged below the carrier line at a position where the spot-type radiation thermometer and the scanning radiation thermometer are opposed to each other across the carrier line. A plurality of the spot type fiber thermometers arranged at a position facing the type radiation thermometer are arranged at appropriate intervals in the scanning direction of the scanning radiation thermometer, and the temperature performance analysis means is the temperature measurement means A temperature assurance system for thick steel sheets, characterized in that the steel sheet temperature is obtained from the temperature measured in step (1).
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