JP2010066132A - Method of controlling temperature in continuous annealing furnace, and continuous annealing furnace - Google Patents
Method of controlling temperature in continuous annealing furnace, and continuous annealing furnace Download PDFInfo
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この発明は、連続焼鈍炉における温度制御方法および連続焼鈍炉に関する。 The present invention relates to a temperature control method in a continuous annealing furnace and a continuous annealing furnace.
冷間タンデムで金属ストリップを冷間圧延すると、冷間圧延された金属ストリップは塑性変形によって生じた転位がからみ合って硬化する。硬化した金属ストリップは、プレス加工性などの二次加工性が悪いため、硬化した金属ストリップを軟化させるために焼鈍を行う。焼鈍工程は、一般に金属ストリップを加熱・保時・冷却する工程から成り立っている。加熱することによって鉄原子は移動しやすくなるので、加工によって硬化した鋼の結晶は回復し、再結晶する。この過程で、からみ合った転位は消滅し、加熱、保持条件に対応した大きさの新しい結晶粒が生成し、成長する。さらに、加熱、保持の時に、析出物は分解し固溶原子になる。固溶した原子は、冷却時、冷却速度に応じた大きさと分布でふたたび析出する。このような結晶粒や析出物の変化も材料の硬さに影響を及ぼす。この一連のプロセスは連続的に行われ、連続焼鈍炉と呼ばれている。 When a metal strip is cold-rolled with cold tandem, the cold-rolled metal strip is entangled and hardened by dislocations caused by plastic deformation. Since the hardened metal strip has poor secondary workability such as press workability, annealing is performed to soften the hardened metal strip. The annealing process generally comprises a process of heating, holding and cooling the metal strip. Heating makes it easier for iron atoms to move, so the steel crystals hardened by processing recover and recrystallize. In this process, the entangled dislocations disappear, and new crystal grains with a size corresponding to the heating and holding conditions are generated and grown. Furthermore, the precipitate decomposes into solid solution atoms during heating and holding. When the atoms are dissolved, they are precipitated again with a size and distribution according to the cooling rate. Such changes in crystal grains and precipitates also affect the hardness of the material. This series of processes is performed continuously and is called a continuous annealing furnace.
上述したように、連続焼鈍炉では圧延された金属ストリップを熱処理するため、その温度制御精度が材質に大きな影響を及ぼす。一般に連続焼鈍炉内の加熱された金属ストリップの温度は、非接触方式の放射温度計で測定される。放射温度計は被測定物の表面状態の影響を受けるので、温度測定精度を向上させるためには被測定物の表面状態（粗度、スケール等）に応じて、上記放射温度計の放射率を正しく設定する必要がある。放射率が適正でないと、実際の加熱された金属ストリップの温度を、実際の温度よりも高くあるいは低く検出し、その検出された温度を元に炉の温度制御が行われるため連続焼鈍炉で熱処理された後の金属ストリップに材質上のバラツキが生じてしまう。近年、品質管理の厳格化が進み、このバラツキが問題として浮上した。このため、連続焼鈍炉における高精度な温度制御が望まれていた。 As described above, since the rolled metal strip is heat-treated in the continuous annealing furnace, the temperature control accuracy greatly affects the material. Generally, the temperature of the heated metal strip in the continuous annealing furnace is measured by a non-contact type radiation thermometer. Since the radiation thermometer is affected by the surface condition of the object to be measured, in order to improve the temperature measurement accuracy, the emissivity of the radiation thermometer is set according to the surface condition (roughness, scale, etc.) of the object to be measured. It is necessary to set it correctly. If the emissivity is not appropriate, the temperature of the actual heated metal strip is detected higher or lower than the actual temperature, and the furnace temperature is controlled based on the detected temperature, so heat treatment is performed in a continuous annealing furnace. The resulting metal strip will vary in material. In recent years, quality control has become stricter, and this variation has emerged as a problem. For this reason, highly accurate temperature control in a continuous annealing furnace has been desired.
これを解決するため、例えば鋼板の表面温度を高精度に測定するために、複数の波長の放射輝度を複数の偏光角の成分において測定し、その測定された複数の偏光角成分における信号と表面温度にもとづいて放射率を算出する鋼板温度計測方法（特許文献１）や、外部酸化層の酸化物の組成比率をオンライン測定しその組成比率に基づいて放射率を補正する方法（特許文献２）や、炉温とストリップ温度とライン速度と炉内ロール温度を測定して放射率を算出設定する方法（特許文献３）などがある。 In order to solve this, for example, in order to measure the surface temperature of a steel sheet with high accuracy, the radiance of a plurality of wavelengths is measured in a plurality of polarization angle components, and the signals and surfaces in the measured plurality of polarization angle components are measured. Steel plate temperature measurement method for calculating emissivity based on temperature (Patent Document 1) and method for on-line measurement of oxide composition ratio of external oxide layer and correcting emissivity based on the composition ratio (Patent Document 2) Alternatively, there is a method of calculating and setting the emissivity by measuring the furnace temperature, strip temperature, line speed, and in-furnace roll temperature (Patent Document 3).
これらの方法は有効であるものの、最終スタンドでダルワークロールにより圧延された表面粗度が変化する金属ストリップ（粗度変化の要因はダルワークロールの摩耗による粗度の平滑化による）のようなものには、あまり効果がないという問題がある。 Although these methods are effective, such as metal strips with varying surface roughness rolled by a dull work roll at the final stand (the cause of the roughness change is due to the smoothing of the roughness due to wear of the dull work roll) There is a problem that things are not very effective.
従来の連続焼鈍炉の温度制御方法では、放射率に及ぼす金属ストリップの粗度等の表面状態の影響が考慮されていないため、最終スタンドでダルワークロールにより圧延された表面粗度が変化する金属ストリップの温度制御は十分でなく、材質にバラツキが生じてしまう。 In conventional temperature control methods for continuous annealing furnaces, the influence of surface conditions such as the roughness of the metal strip on the emissivity is not taken into account, so the metal whose surface roughness is rolled by the dull work roll at the final stand changes. The temperature control of the strip is not sufficient, resulting in variations in material.
本発明は、最終スタンドでダルワークロールにより圧延された表面状態が変化する金属ストリップの連続焼鈍炉における温度を高精度に制御し、材質にバラツキのない安定した金属ストリップを連続焼鈍炉で製造することが可能な連続焼鈍炉における温度制御方法を提供することを課題としている。 The present invention controls the temperature in a continuous annealing furnace of a metal strip whose surface state is changed by a dull work roll at the final stand with high accuracy, and manufactures a stable metal strip having no material variation in the continuous annealing furnace. It is an object of the present invention to provide a temperature control method in a continuous annealing furnace that can be used.
上記課題を解決するため、本発明によれば、連続焼鈍炉における金属ストリップの温度制御方法であって、連続焼鈍炉上流において金属ストリップの表面状態を測定する工程と、予め鋼種毎に定められる前記金属ストリップの表面状態と放射率の関係から放射率を求める工程と、求まった放射率を用いて前記放射温度計で測定した温度に基づいて、前記連続焼鈍炉内における前記金属ストリップの表面温度が所望の温度となるように温度制御を行う工程と、を有することを特徴とする、連続焼鈍炉における温度制御方法が提供される。 In order to solve the above-mentioned problem, according to the present invention, there is provided a method for controlling the temperature of a metal strip in a continuous annealing furnace, the step of measuring the surface state of the metal strip upstream of the continuous annealing furnace, and the above-mentioned predetermined for each steel type Based on the step of obtaining the emissivity from the relationship between the surface state of the metal strip and the emissivity, and the temperature measured by the radiation thermometer using the obtained emissivity, the surface temperature of the metal strip in the continuous annealing furnace is There is provided a temperature control method in a continuous annealing furnace, comprising a step of performing temperature control so as to obtain a desired temperature.
また、前記金属ストリップの表面状態の測定は、断続的に表面粗度を測定することで行われてもよく、前記金属ストリップの表面状態の測定は、連続的または断続的に表面光沢を測定することで行われてもよい。 In addition, the measurement of the surface state of the metal strip may be performed by intermittently measuring the surface roughness, and the measurement of the surface state of the metal strip may measure the surface gloss continuously or intermittently. It may be done.
さらに、請求項１〜３に記載の温度制御方法において、連続焼鈍設備の金属ストリップと接触するロール表面近傍に熱電対を設置し定常状態の温度を測定し、前記熱電対で測定されたロール温度と前記放射温度計で測定された温度とが一致する放射率を求めるとともに、測定された金属ストリップの表面状態と放射率を用いて金属ストリップ表面状態と放射率の関係式を学習することとしてもよい。
Furthermore, in the temperature control method according to
また、別の観点からの本発明によれば、金属ストリップの温度制御を行う予熱帯、均熱帯および冷却帯によって構成される連続焼鈍炉であって、前記連続焼鈍炉内に設けられる放射温度計と、前記連続焼鈍炉の上流に配置される前記金属ストリップの表面状態測定装置と、前記表面状態測定装置の測定結果から放射率を演算し、前記放射率と前記放射温度計で求めた温度に基づいて、前記予熱帯、均熱帯および冷却帯の温度制御を行う演算制御部と、を備えることを特徴とする、連続焼鈍炉が提供される。 According to another aspect of the present invention, there is provided a continuous annealing furnace constituted by a pre-tropical zone, a soaking zone and a cooling zone for controlling the temperature of the metal strip, and a radiation thermometer provided in the continuous annealing furnace. And a surface state measuring device of the metal strip disposed upstream of the continuous annealing furnace, and calculating an emissivity from the measurement result of the surface state measuring device, and calculating the emissivity and the temperature obtained by the radiation thermometer. Based on this, a continuous annealing furnace is provided, comprising: an arithmetic control unit that performs temperature control of the pretropical zone, the soaking zone, and the cooling zone.
本発明では、最終スタンドでダルワークロールにより圧延された表面状態が変化する金属ストリップの表面状態（表面粗度あるいは表面光沢）を測定し、その結果に基づいて該金属ストリップの温度を測定するための放射温度計の放射率を設定して炉の温度を高精度に制御することが可能となる。 In the present invention, in order to measure the surface state (surface roughness or surface gloss) of a metal strip whose surface state is changed by a dull work roll at the final stand, and to measure the temperature of the metal strip based on the result. The emissivity of the radiation thermometer can be set to control the furnace temperature with high accuracy.
本発明の形態をここでは、ＴＲＩＰ鋼の圧延を例に挙げて説明する。このＴＲＩＰ鋼の合金成分は質量％で０．１１％Ｃ，１．３％Ｓｉ，１．６％Ｍｎである。熱間圧延された板厚３．０mm、板幅１２４０ｍｍのコイルを酸洗し、冷間タンデム圧延機で板厚１．０１mmまで圧延しその後、電清した材料が連続焼鈍炉用の金属ストリップとして用いられた。なお、冷間タンデム圧延機の最終スタンドでは放電ダル加工されたワークロール（初期ワークロール表面粗度：３．５μｍRa）が用いられており、圧下率３％程度の圧延が行われ該金属ストリップの表面にワークロール粗度が２０〜４０％程度転写されている。 The embodiment of the present invention will be described here by taking the rolling of TRIP steel as an example. The alloy components of this TRIP steel are 0.11% C, 1.3% Si, 1.6% Mn in mass%. Hot rolled steel sheet with a thickness of 3.0mm and sheet width of 1240mm is pickled, rolled to a sheet thickness of 1.01mm with a cold tandem rolling mill, and then electropolished material is used as a metal strip for a continuous annealing furnace. Used. In the final stand of the cold tandem rolling mill, a work roll subjected to electric discharge dull processing (initial work roll surface roughness: 3.5 μm Ra) is used, and rolling with a reduction rate of about 3% is performed. The work roll roughness is transferred to the surface by about 20 to 40%.
冷間タンデム圧延機の最終スタンドのワークロール粗度は摩耗により圧延本数と共に低下し、それに伴い、該金属ストリップの表面粗度も低減する。一般にＴＲＩＰ鋼は普通鋼と比較して変形抵抗が大きく圧延荷重が高いので、この摩耗による最終スタンドのワークロール粗度低下は普通鋼と比べて早いという特徴がある。このため、一般には許容される該金属ストリップの表面粗度範囲内に納まるように、予め試験を行い連続圧延可能なコイル本数を求め、その範囲に収まるように圧延スケジュールを調整したり、あるいは、ワークロールを交換したりして製造されている。 The work roll roughness of the final stand of the cold tandem rolling mill decreases with the number of rolling due to wear, and accordingly, the surface roughness of the metal strip also decreases. In general, TRIP steel has a large deformation resistance and a higher rolling load than ordinary steel, so that the lowering of the work roll roughness of the final stand due to this wear is faster than that of ordinary steel. For this reason, in general, the number of coils that can be continuously rolled by performing a test in advance so as to be within the allowable surface roughness range of the metal strip is determined, and the rolling schedule is adjusted to be within that range, or It is manufactured by exchanging work rolls.
このように徐々に表面粗度が低減するような金属ストリップを連続焼鈍炉で熱処理する際、連続焼鈍炉内の放射温度計の放射率が一定の場合には、測定された温度と実際の温度とに差が生じるため、機械的性質としては許容範囲内に納まるものの材質にバラツキが生じる。焼鈍前の上記サンプルを採取し、温度８５０℃の雰囲気の実験炉を用いて定常状態で熱電対を用いて測定した真の温度と放射温度計で測定した温度とを比較した結果、最大で３０℃程度の差が認められた。 When heat treatment is performed in a continuous annealing furnace on a metal strip whose surface roughness gradually decreases in this way, if the emissivity of the radiation thermometer in the continuous annealing furnace is constant, the measured temperature and the actual temperature Therefore, although the mechanical properties are within the allowable range, the materials vary. The above-mentioned sample before annealing was collected, and as a result of comparing the true temperature measured with a thermocouple in a steady state using an experimental furnace with an atmosphere of 850 ° C. and the temperature measured with a radiation thermometer, a maximum of 30 A difference of about ℃ was recognized.
これらのサンプルを用いて、真の温度と一致する放射温度計の放射率を求め、この放射率と金属ストリップの表面粗度との回帰式を作成した。このようにして求めた表面粗度と放射率の関係を図１に示す。図１より、表面粗度が大きくなるにつれて放射率も増大すること、また、表面粗度と放射率の関係は１次式で近似可能であることが分かる。重回帰を行い、上記表面粗度と放射率の1次式の定数を求めれば良い。 Using these samples, the emissivity of the radiation thermometer corresponding to the true temperature was determined, and a regression equation between the emissivity and the surface roughness of the metal strip was created. FIG. 1 shows the relationship between the surface roughness thus obtained and the emissivity. As can be seen from FIG. 1, the emissivity increases as the surface roughness increases, and the relationship between the surface roughness and the emissivity can be approximated by a linear expression. Multiple regression may be performed to obtain the linear constants of the surface roughness and emissivity.
別の圧延チャンスで採取した金属ストリップのサンプルを用い温度８５０℃の雰囲気の実験炉を用いて定常状態で熱電対で測定した真の温度と表面粗度を測定しその結果を用いて上記放射率と金属ストリップの表面粗度との回帰式から求められた放射率を用いて放射温度計で測定した温度とを比較した結果、温度差は最大でも２℃であった。 Using the sample of the metal strip taken at another rolling opportunity, the true temperature and surface roughness measured with a thermocouple in a steady state using an experimental furnace with an atmosphere of 850 ° C., and using the result, the emissivity is measured. As a result of comparing the temperature measured with the radiation thermometer using the emissivity obtained from the regression equation of the surface roughness of the metal strip, the temperature difference was 2 ° C. at the maximum.
同様にして、真の温度と一致する放射温度計の放射率を求め、この放射率と金属ストリップの表面光沢との回帰式を作成した。このようにして求めた表面光沢と放射率の関係を図２に示す。図２より、表面光沢が大きくなるにつれて放射率は減少すること、また、表面光沢と放射率の関係は１次式で近似可能であることが分かる。重回帰を行い、上記表面光沢と放射率の1次式の定数を求めれば良い。 Similarly, the emissivity of the radiation thermometer that coincided with the true temperature was obtained, and a regression equation between the emissivity and the surface gloss of the metal strip was created. FIG. 2 shows the relationship between the surface gloss and emissivity thus obtained. 2 that the emissivity decreases as the surface gloss increases, and the relationship between the surface gloss and the emissivity can be approximated by a linear expression. Multiple regression may be performed to obtain the linear constants of the surface gloss and emissivity.
別の圧延チャンスで採取した金属ストリップのサンプルを用い温度８５０℃の雰囲気の実験炉を用いて定常状態で熱電対を用いて測定した真の温度と表面光沢を測定しその結果を用いて上記放射率と金属ストリップの表面光沢との回帰式から求められた放射率を用いて放射温度計で測定した温度とを比較した結果、温度差は最大でも４℃であった。 Using a sample of a metal strip taken at another rolling opportunity, the true temperature and surface gloss measured using a thermocouple in a steady state using an experimental furnace with an atmosphere of 850 ° C., and using the results, the above radiation was measured. As a result of comparing the temperature measured with a radiation thermometer using the emissivity obtained from the regression equation of the rate and the surface gloss of the metal strip, the temperature difference was 4 ° C. at the maximum.
このように、焼鈍される金属ストリップの表面粗度あるいは表面光沢を測定し、予め求めた放射率と金属ストリップの表面粗度あるいは表面光沢の回帰式から、放射率を算出し、算定された放射率を用いて焼鈍炉内の金属ストリップの温度を測定し温度制御することによって、材質のバラツキを減少できる可能性があることが明らかとなった。 In this way, the surface roughness or surface gloss of the metal strip to be annealed is measured, and the emissivity is calculated from the previously determined emissivity and the regression equation of the surface roughness or surface gloss of the metal strip. It was found that the variation in material could be reduced by measuring the temperature of the metal strip in the annealing furnace using the rate and controlling the temperature.
連続焼鈍炉で、本発明を実施するに当たり上述した放射率と金属ストリップの表面粗度あるいは表面光沢の回帰式が必要となるが、実験炉と実際の連続焼鈍炉では雰囲気やスケール等の条件が必ずしも一致してはいないので、連続焼鈍炉で測定された放射率と金属ストリップの表面粗度あるいは表面光沢の回帰式を学習する必要がある。このため、放射温度計で測定される金属ストリップが接触しているロール表面近傍に熱電対を設置し、ロールの温度を測定する。定常状態時にはこのロールの温度と金属ストリップの温度とは等しいので、定常状態時にロール温度と測定された金属ストリップ温度とが一致する放射率を求めその値を真の放射率として学習すれば良い。 In the continuous annealing furnace, in order to carry out the present invention, the regression equation of the emissivity and the surface roughness or surface gloss of the metal strip described above is required. However, in the experimental furnace and the actual continuous annealing furnace, there are conditions such as atmosphere and scale. Since they do not necessarily match, it is necessary to learn the regression equation of the emissivity measured in the continuous annealing furnace and the surface roughness or surface gloss of the metal strip. For this reason, a thermocouple is installed in the vicinity of the roll surface in contact with the metal strip measured by the radiation thermometer, and the temperature of the roll is measured. Since the temperature of the roll and the temperature of the metal strip are equal in the steady state, the emissivity at which the roll temperature and the measured metal strip temperature coincide with each other in the steady state is obtained, and the value is learned as the true emissivity.
表面粗度は例えばＪＩＳＢ０６５１に、表面光沢は例えばＪＩＳＺ８７４１に準じてそれぞれ測定する。表面粗度は金属ストリップが停止していないと測れないので断続的な測定値になる。表面光沢も金属ストリップが停止している方が好ましいが、平均的な値の場合には金属ストリップが停止していなくても良い。この場合には連続的な測定値となる。 The surface roughness is measured according to, for example, JISB0651, and the surface gloss is measured according to, for example, JISZ8741. Since the surface roughness cannot be measured unless the metal strip is stopped, it becomes an intermittent measurement. The surface gloss is also preferably stopped by the metal strip, but in the case of an average value, the metal strip may not be stopped. In this case, it becomes a continuous measurement value.
図３は本発明の実施例の１例を示す連続焼鈍炉１０の図である。図示してはいないがこの連続焼鈍炉の上流に冷間タンデム圧延機が配置されており、熱間圧延され酸洗されたコイルが冷間圧延される。本実施例では、使用した金属ストリップは合金成分質量％で０．１１％Ｃ，１．３％Ｓｉ，１．６％ＭｎのＴＲＩＰ鋼であり、熱間圧延された板厚３．０mm、板幅１２４０ｍｍのコイルを酸洗し、冷間タンデム圧延機で板厚１．０１mmまで圧延したもので、その後電清され連続化された金属ストリップＳが連続焼鈍炉に供給されている。
なお、冷間タンデム圧延機の最終スタンドでは放電ダル加工されたワークロール（初期ワークロール表面粗度：３．５μｍRa）が用いられており、圧下率３％程度の圧延が行われ該金属ストリップの表面にワークロール粗度が２０〜４０％程度転写されている。
FIG. 3 is a diagram of a
In the final stand of the cold tandem rolling mill, a work roll subjected to electric discharge dull processing (initial work roll surface roughness: 3.5 μm Ra) is used, and rolling with a reduction rate of about 3% is performed. The work roll roughness is transferred to the surface by about 20 to 40%.
図３において、上記金属ストリップＳの表面光沢は連続焼鈍炉１０の上流に設置された表面光沢測定装置４によって連続的に測定される。その測定結果は演算機７に伝達され、予め鋼種毎に求められた焼鈍される金属ストリップ表面光沢と放射率の関係式から金属ストリップＳの表面温度を測定する放射温度計１１の放射率が求められ、連続焼鈍炉１０の放射温度計１１の放射率が設定される。
連続焼鈍炉１０は，予熱帯１と均熱帯２と冷却帯３から構成されており、熱処理が施された金属ストリップＳは，連続焼鈍炉の下流に配置された六重圧延機５である調質圧延機で形状を矯正した後，精整装置のサイドトリマーで金属ストリップ巾方向の両端部を切断して所定寸法にするとともに塗油機で防錆油を塗布して簡易防錆処理を施した後，塗油機下流のシャー６によって所望の長さで切断され，巻き取りリール８に巻き取られ，金属ストリップコイルが製造されている。
In FIG. 3, the surface gloss of the metal strip S is continuously measured by a surface gloss measuring device 4 installed upstream of the
The
例えば、図３において、金属ストリップＳの任意の点が位置Ｘにあるとき、当該位置Ｘの放射率が表面光沢測定装置４によって測定され、演算機７に入力される。演算機７は、入力された表面光沢から前記任意の点の金属ストリップＳ表面の放射率を演算する。そして、前記任意の点が図３中の位置Ｘ１に移動したときに、予め求められている放射率に基づいて放射温度計１１によって前記任意の点の金属ストリップＳの温度が求まる。その求まった温度が演算機７に入力され、演算機７の制御により予熱帯１の温度が所望の温度となる。
For example, in FIG. 3, when an arbitrary point of the metal strip S is at the position X, the emissivity at the position X is measured by the surface gloss measurement device 4 and input to the calculator 7. The calculator 7 calculates the emissivity of the surface of the metal strip S at the arbitrary point from the input surface gloss. Then, when the arbitrary point moves to the position X 1 in FIG. 3, the temperature of the metal strip S of the arbitrary point is determined by the radiation thermometer 11 on the basis of the emissivity that has been determined in advance. The obtained temperature is input to the calculator 7, and the temperature of the
なお、均熱帯２における位置Ｘ２および冷却帯３における位置Ｘ３においても同様の温度制御が行われる。この方法は上記位置Ｘ１の場合と同様のため説明は省略する。
The same temperature control is performed at the position X 2 in the soaking zone 2 and the position X 3 in the
比較のため、放射率が一定であるとして放射温度計１１で測定し温度制御した場合を従来技術とした。金属ストリップＳとしては冷間タンデム圧延機の最終スタンドワークロール組み替え直後からの１５コイル（連続的に表面粗度は低下）を熱処理するとともに調質圧延して、引っ張り試験を行い０．２％耐力を測定しそのバラツキで評価することとした。
従来技術である放射率が一定であるとして放射温度計１１で測定し温度制御した場合には、バラツキとして０．２％耐力は８０ＭＰａ程度あった。一方、表面光沢測定装置４によって連続的に測定され、その測定結果を基に、予め鋼種毎に求められた焼鈍される金属ストリップ表面光沢と放射率の関係式をから該金属ストリップの表面温度を測定する放射温度計１１の放射率が求められ、その放射率に基づいて、放射温度計によって温度測定を行い、連続焼鈍炉の温度制御した場合には、バラツキとして０．２％耐力は１０ＭＰａ程度であった。
For comparison, the case where the emissivity is constant and the temperature is controlled by measuring with the radiation thermometer 11 is defined as the conventional technique. As metal strip S, heat treatment and temper rolling of 15 coils (continuously lowering the surface roughness) immediately after the final stand work roll recombination of the cold tandem mill, 0.2% proof stress Was measured and evaluated based on the variation.
When the emissivity, which is the prior art, is constant and measured with the radiation thermometer 11 and temperature controlled, the 0.2% proof stress was about 80 MPa as a variation. On the other hand, the surface temperature of the metal strip is determined from the relational expression between the surface gloss of the metal strip to be annealed and the emissivity obtained for each steel type based on the measurement results continuously measured by the surface gloss measuring device 4. The emissivity of the radiation thermometer 11 to be measured is obtained, and when the temperature is measured by the radiation thermometer based on the emissivity and the temperature of the continuous annealing furnace is controlled, the 0.2% proof stress is about 10 MPa as variation. Met.
実施例１と同様であるが、ここでは上記表面光沢測定装置４を用いて測定する表面光沢ではなく、表面粗度の測定を用いた。上述したようにこの連続焼鈍炉の上流に冷間タンデム圧延機が配置されており、熱間圧延され酸洗されたコイルが冷間圧延される。冷間圧延されたコイルは搬送され、電清装置の上流に設置された接合機で連続化される。このとき一時的にコイルは静止状態になるのでその時の表面粗度を測定した。この時、冷間タンデム圧延機の圧延ロールの粗度を測定することによりコイルの粗度が測定されることとなる。即ち、図示しない冷間タンデム圧延機の圧延ロールの粗度を測定する表面粗度測定装置が用いられることとなる。なお、ここでは表面粗度測定は接合時の例を示しているが、冷間タンデム圧延後から連続焼鈍炉の入側までのどこのタイミングで測定しても構わない。 Although it is the same as that of Example 1, the measurement of surface roughness was used here instead of the surface gloss measured using the surface gloss measuring device 4. As described above, a cold tandem rolling mill is disposed upstream of the continuous annealing furnace, and the hot-rolled and pickled coil is cold-rolled. The coil that has been cold-rolled is transported and continuous by a bonding machine installed upstream of the electrocleaning apparatus. At this time, since the coil temporarily became stationary, the surface roughness at that time was measured. At this time, the roughness of the coil is measured by measuring the roughness of the rolling roll of the cold tandem rolling mill. That is, a surface roughness measuring device that measures the roughness of a rolling roll of a cold tandem rolling mill (not shown) is used. In addition, although the surface roughness measurement has shown the example at the time of joining here, you may measure at any timing from after cold tandem rolling to the entrance side of a continuous annealing furnace.
比較のため、放射温度計の放射率を一定で測定し温度制御した場合を従来技術とした。
金属ストリップとしては冷間タンデム圧延機の最終スタンドワークロール組み替え直後からの１５コイル（連続的に表面粗度は低下）を熱処理するとともに調湿圧延して、引っ張り試験を行い０．２％耐力を測定しそのバラツキで評価することとした。
従来技術である放射温度計の放射率を一定で測定し温度制御した場合には、バラツキとして０．２％耐力は８０ＭＰａ程度あったが、本発明である表面粗度測定装置によって断続的に測定され、その測定結果を基に、予め鋼種毎に求められた焼鈍される金属ストリップ表面粗度と放射率の関係式をから該金属ストリップの表面温度を測定する放射温度計の放射率が求められ連続焼鈍炉の放射温度計の放射率が設定されて測定して温度制御した場合には、バラツキとして０．２％耐力は１９ＭＰａ程度であった。
For comparison, the case where the emissivity of the radiation thermometer was measured at a constant level and the temperature was controlled was used as the prior art.
As a metal strip, heat treatment is performed on 15 coils (continuously lowering the surface roughness) immediately after the final stand work roll recombination of the cold tandem rolling mill and humidity control rolling is performed, and a tensile test is performed to obtain 0.2% proof stress. It was decided to measure and evaluate the variation.
When the emissivity of a conventional radiation thermometer was measured and controlled at a constant temperature, the 0.2% proof stress was about 80 MPa as variation, but it was measured intermittently by the surface roughness measuring device of the present invention. Based on the measurement results, the emissivity of a radiation thermometer that measures the surface temperature of the metal strip is obtained from the relational expression between the surface roughness and emissivity of the metal strip that is annealed for each steel type in advance. When the emissivity of the radiation thermometer of the continuous annealing furnace was set and measured and the temperature was controlled, the 0.2% proof stress was about 19 MPa as a variation.
本発明は、上記最良の形態に限定されるものではない。例えば、操業速度によってスケールの生成が若干異なり、放射率が変化する場合には上記、表面粗度あるいは表面光沢と放射率の回帰式ではなく、表面粗度あるいは表面光沢と操業速度と放射率の回帰式を用いることが好ましいことは言うまでもない。 The present invention is not limited to the best mode described above. For example, when the generation of scale is slightly different depending on the operation speed and the emissivity changes, it is not the regression equation of surface roughness or surface gloss and emissivity, but the surface roughness or surface gloss, operation speed and emissivity. Needless to say, it is preferable to use a regression equation.
この発明は、連続焼鈍炉における温度制御方法および連続焼鈍炉に適用できる。 The present invention can be applied to a temperature control method in a continuous annealing furnace and a continuous annealing furnace.
Ｓ 金属ストリップ
１ 予熱帯
２ 均熱帯
３ 冷却帯
４ 表面光沢測定装置
５ 六重圧延機
６ シャー
７ 演算機
８ 巻き取りリール
１０ 連続焼鈍炉
１１ 放射温度計
Claims (5)
連続焼鈍炉上流において金属ストリップの表面状態を測定する工程と、
予め鋼種毎に定められる前記金属ストリップの表面状態と放射率の関係から放射率を求める工程と、
求まった放射率を用いて前記放射温度計で測定した温度に基づいて、前記連続焼鈍炉内における前記金属ストリップの表面温度が所望の温度となるように温度制御を行う工程と、を有することを特徴とする、連続焼鈍炉における温度制御方法。 A temperature control method for a metal strip in a continuous annealing furnace,
Measuring the surface state of the metal strip upstream of the continuous annealing furnace;
Obtaining emissivity from the relationship between the surface state of the metal strip and emissivity determined in advance for each steel type;
And a step of performing temperature control so that the surface temperature of the metal strip in the continuous annealing furnace becomes a desired temperature based on the temperature measured by the radiation thermometer using the obtained emissivity. The temperature control method in the continuous annealing furnace characterized by the above-mentioned.
前記連続焼鈍炉内に設けられる放射温度計と、
前記連続焼鈍炉の上流に配置される前記金属ストリップの表面状態測定装置と、
前記表面状態測定装置の測定結果から放射率を演算し、前記放射率と前記放射温度計で求めた温度に基づいて、前記予熱帯、均熱帯および冷却帯の温度制御を行う演算制御部と、を備えることを特徴とする、連続焼鈍炉。 A continuous annealing furnace composed of a pre-tropical zone, a soaking zone and a cooling zone that controls the temperature of the metal strip,
A radiation thermometer provided in the continuous annealing furnace;
An apparatus for measuring the surface condition of the metal strip disposed upstream of the continuous annealing furnace;
An emissivity is calculated from the measurement result of the surface state measuring device, and based on the temperature obtained by the emissivity and the radiation thermometer, an arithmetic control unit that performs temperature control of the pretropical zone, a soaking zone, and a cooling zone, A continuous annealing furnace comprising:
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