WO2005016566A1 - 鋼帯または表面処理鋼帯の製造方法 - Google Patents
鋼帯または表面処理鋼帯の製造方法 Download PDFInfo
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- WO2005016566A1 WO2005016566A1 PCT/JP2003/010294 JP0310294W WO2005016566A1 WO 2005016566 A1 WO2005016566 A1 WO 2005016566A1 JP 0310294 W JP0310294 W JP 0310294W WO 2005016566 A1 WO2005016566 A1 WO 2005016566A1
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- Prior art keywords
- steel strip
- surface layer
- defect
- manufacturing
- property
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
- B21C47/26—Special arrangements with regard to simultaneous or subsequent treatment of the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
- G01N27/904—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents with two or more sensors
Definitions
- the present invention relates to a method for producing a cold-rolled steel strip or a surface-treated steel strip.
- the present invention relates to a method for producing a cold-rolled steel strip or a surface-treated steel strip which is excellent in surface layer properties and has few defects which become obvious in a manufacturing process up to a final product.
- Automotive plated steel sheets are manufactured through a steelmaking process, hot rolling process, pickling process, cold rolling process, plating process, and the like, and are further processed through a press process and a painting process into automobile components.
- One of the major defects in plated steel sheets for automobiles is surface defects, commonly referred to as hedging, slippers, and scratches.In the final automobile, the defect appears to be clearly different from other healthy parts. It causes the problem of damage or, if it is extremely severe, damages the press machine during press molding.
- the scabs may be formed inside the steel material.
- Patent Document 1 Japanese Patent Application Laid-Open No. 61-219430
- a surface defect detection device is installed at the pickling line exit side as a detection unit
- a brush or roll with abrasive grains is installed at the continuous cold rolling line entrance side as a defect removal unit.
- Patent Document 2 Japanese Patent Application Laid-Open No. 2001-191206, which discloses a surface flaw such as a dent on the steel sheet.
- a method has been proposed in which shavings are removed by U processing and rolling marks are removed by rolling.
- some of the surface defects such as hedging include those in the hot rolled sheet or pickling plate stages.
- the abnormal portion is not evident, that is, it does not appear on the surface, or it is very harmless at that stage because it is partially exposed and not exposed.
- the present invention has been made in view of such circumstances, and includes steps from hot rolling to final consumption (surface treatment such as pickling, cold rolling, heat treatment, plating, enamelling, press molding, painting, etc.). ), It is possible to take appropriate manufacturing measures even for abnormal parts that have not become obvious, and there are few defects in each process leading to final consumption, or even if there are defects, surface layers that do not hinder production. It is an object to provide a method for producing a steel strip or a surface-treated steel strip having excellent properties. Disclosure of the invention
- the present invention provides a method for producing a steel strip or a surface-treated steel strip having a hot rolling step, a property measurement step, a prediction step, a determination step, and a production step.
- the hot rolling step comprises hot rolling a billet to produce a hot rolled steel strip.
- the property measuring step includes measuring the property of the surface layer of the steel strip and obtaining a measurement result.
- the prediction step in each of the steps from the property measurement step to the final consumption, it is predicted whether or not the measured portion becomes obvious as a surface defect using the result of the surface layer measurement, It consists of obtaining prediction results.
- the determining step includes determining the following manufacturing steps and manufacturing conditions according to the prediction result.
- the production process comprises producing a steel strip or a surface-treated steel strip based on the determined production steps and production conditions. It is preferable that the method of manufacturing the steel strip or the surface-treated steel strip further includes a step of feed-packing the manufacturing steps and manufacturing conditions before the hot rolling step according to the prediction result.
- the prediction step is preferably at least one selected from the following.
- the forecasting process uses the results of the surface layer measurement described above, and the steel strip manufacturing condition targets and results until the forecasting is performed as the information for forecasting.
- the product specification information including manufacturing conditions, applications, and inspection specifications, predict whether the measured location will become a surface defect and obtain the predicted results Consisting of
- the prediction process consists of using information on the depth distribution of the surface layer having properties different from those of other parts, making predictions, and obtaining prediction results.
- the manufacturing process includes removing a region including the portion to be removed by a partial removing unit, and then cold rolling the steel strip. It is preferable that the determining step comprises the ability to determine the following manufacturing steps, manufacturing conditions, and product specifications according to the prediction result.
- the surface layer of the steel strip is subjected to AC magnetism, and a change in AC magnetic flux generated due to the property of the surface layer is measured to measure the property of the surface layer of the steel strip. It preferably consists of More specifically, it is more preferable to perform one of the following.
- a change in AC magnetic flux caused by the properties of the surface layer is detected by at least two or more magnetic sensors arranged side by side substantially in the width direction of the steel strip, and a difference signal in the width direction of the detection signal is also detected. Then, the properties of the surface layer of the steel strip are measured.
- the three legs of the E-shaped ferromagnetic material are arranged substantially perpendicularly to the steel strip surface and substantially parallel to the width direction of the steel strip, respectively.
- An alternating current is applied to the primary coil wound around the steel strip to excite the steel strip, and the steel strip is excited based on the difference between the voltages induced in the secondary coils wound around the two outer legs. It is desirable to measure the properties of the surface layer of the belt.
- the magnetic sensor is mechanically moved in the width direction of the steel strip and scanned in the width direction of the steel strip, and the properties of the surface layer of the steel strip are changed based on the change in the signal of the magnetic sensor generated by the scanning. It may be measured. Also, by arranging a plurality of magnetic sensors in the width direction of the steel strip and electronically switching and selecting the magnetic sensors, scanning in the width direction of the steel strip is not performed, and a change in a signal of the magnetic sensor generated by the scanning is performed. The properties of the surface layer of the steel strip may be measured based on the above.
- the method for producing a steel strip or a surface-treated steel strip may further include, in a final shipping stage of the steel strip, a surface layer property measuring step of measuring a property of a surface layer of the steel strip;
- the present invention provides a method for producing a steel strip or a surface-treated steel strip having a hot rolling step, a detecting step, a determining step and a removing step.
- the hot rolling step comprises hot rolling a steel slab to produce a hot rolled steel strip.
- the detecting step includes performing AC excitation of the steel strip and detecting a change in AC magnetic flux generated due to the defect, thereby detecting a defect candidate included in the steel strip.
- the determining step includes determining, from among the defect candidates detected in the detecting step, an elongated surface layer or a surface defect candidate having a long side whose rolling direction of the steel strip is a long side as a removal target.
- the removing step includes selecting and grinding or cutting a region including the removal target determined in the determining step.
- the detection step is preferably performed by one selected from the following.
- the three legs of the E-shaped ferromagnetic material are arranged substantially perpendicularly to the steel strip surface and substantially parallel to the width direction of the steel strip, and are placed on the center leg.
- An AC current is applied to the wound primary coil to excite the steel strip, and the secondary coil wound on each of the two outer legs is formed.
- a difference between the induced voltages is used as the difference signal, and a defect is detected based on the difference signal.
- the steel strip is AC-magnetized, the magnetic sensor is scanned in the width direction of the steel strip, and a defect is detected based on a change in the signal of the magnetic sensor generated by the scanning.
- the magnetic sensor By mechanically moving the magnetic sensor in the width direction of the steel strip, the magnetic sensor is scanned in the width direction of the steel strip, and a defect is detected based on a change in a signal of the magnetic sensor generated by the scanning, or By arranging a plurality of magnetic sensors in the width direction of the steel strip and electronically switching and selecting the magnetic sensors, the magnetic sensor is scanned in the width direction of the steel strip, and a signal of the magnetic sensor generated by the scanning is generated. Detect defects based on changes.
- the defect detection step and the defect removal step is performed at a position where the steel strip force inspection surface or the surface opposite to the defect removal surface is supported by the row after the leveler. It is preferable that the defect detecting step includes a force for detecting a defect in a place where the unit tension of the steel strip is 0.3 kgf / arm 2 or more.
- FIG. 1 is a schematic diagram showing a configuration of a surface layer property measuring device of a width direction difference method according to the present invention.
- FIG. 2 is a schematic diagram showing a configuration of an E-type sensor type surface layer property measuring apparatus according to the present invention.
- FIG. 3 is a schematic view showing the configuration of a surface layer property measuring device of the width running type according to the present invention.
- FIG. 4 is a schematic diagram showing the configuration of an electronic scanning type surface layer property measuring apparatus according to the present invention.
- FIGS. 5 (a), 5 (b), and 5 (c) are schematic diagrams showing the configuration of a comb-type sensor-based surface property measuring apparatus according to the present invention, and FIG. Fig. 5 (b) shows an example in which AC magnetic flux is generated using legs 10b, 10c, and 10d using legs 10a, 1Ob, and 10c.
- FIG. 5 (c) is an example in which an AC magnetic flux is generated using the legs 10c, 10d, and 10e.
- FIG. 6 (a) is a diagram showing the arrangement of the surface layer property measuring apparatus according to the present invention
- FIG. 6 (b) is a standard micro surface property using the surface layer property measuring apparatus of FIG. 6 (a).
- FIG. 4 is a diagram showing a signal waveform of a magnetic sensor at the time of an abnormal part.
- FIG. 7 (a) is a view showing the arrangement of the surface layer property measuring device according to the present invention
- FIG. 7 (b) is a diagram showing the surface layer property measuring device of FIG. 7 (a).
- FIG. 4 is a diagram illustrating a signal waveform of a magnetic sensor when an abnormal portion is scanned in a rolling direction.
- FIG. 8 is a diagram illustrating an example of an embodiment of the present invention.
- FIG. 9 is a diagram showing a configuration of a defect occurrence prediction device according to the present invention.
- FIG. 10 is a diagram showing a basic configuration example (schematic steps) of the present invention.
- FIG. 11 is a diagram showing a prediction flow using an AC magnetic flux according to the present invention.
- FIG. 12 is a diagram showing a relationship between a surface defect revealed in a certain process and a surface layer property abnormality measured in advance in the present invention.
- FIG. 13 is a diagram showing a process example (an example of determining a product type and a manufacturing condition) for determining a manufacturing process and a manufacturing condition according to a prediction result according to the present invention.
- FIG. 14 is a diagram showing a process example (an example of determining a process) of determining a manufacturing process and manufacturing conditions according to a prediction result according to the present invention.
- FIG. 15 is a diagram illustrating an example of a prediction result according to the present invention based on a depth position among prediction results.
- FIG. 16 is a diagram showing an example of a processing flow of the defect revealing prediction device according to the present invention.
- the present invention relates to a method for producing a steel strip and a surface-treated steel strip by producing at least a steel strip and a surface-treated steel strip by hot rolling the steel, comprising the following steps after hot rolling.
- the surface layer property measuring step not only the surface defect at that time is measured but also the property of the surface layer which is not evident as a surface defect.
- the property of the surface layer that has not been revealed as a surface defect is referred to as a latent defect.
- potential defects include surface layer properties that are expected to be apparent in the manufacturing process up to shipment, as well as in the final consumption process, that is, during the press working at the customer after shipment. Surface properties that are expected to become apparent can also be targets for prediction.
- Manufacturing process '' In the condition determination process, if there is a possibility that surface defects will become apparent, change the manufacturing conditions or process to prevent surface defects, or change the parts that may become surface defects. A process change for performing maintenance and the like is determined. In order to make appropriate process changes for the surface layer properties, it is desirable to provide the ability to form a logic in advance, and to provide a table or the like based on past results and experimental results. Process changes can be implemented without human judgment.
- the present invention further comprises the following steps after hot rolling and before cold rolling, and thereafter performing cold rolling, and producing a steel strip having excellent surface layer properties and a surface-treated steel strip. It can also be a method.
- a removal target determining step of determining a surface layer portion to be removed from a portion predicted to manifest as a defect (4) a removal target determining step of determining a surface layer portion to be removed from a portion predicted to manifest as a defect; (5) a partial removal step of removing a region including the removal target portion by partial removal means.
- the potential defect portion is removed as a manufacturing process and a manufacturing condition when a defect is predicted to be revealed by the defect revealing prediction process. That is, in the removal target determination step, the position (range) and removal amount (removal depth) of the surface layer to be removed are determined, and the removal target part is removed in the partial removal step. Thereafter, cold rolling is performed to produce a cold-rolled steel sheet, or surface treatment is further performed to produce a surface-treated steel sheet.
- the surface property is further measured before the shipping step, and defects that have become apparent at this point are detected.
- the defect appearance prediction step the appearance of surface defects is predicted as in the above-described invention.
- an abnormal part detected by the surface property measurement and a part where a surface defect is predicted to become apparent are determined as removal / display target parts.
- a feedforward operation is performed, such as cutting out a longitudinal area of the steel strip that includes many parts that are likely to be defective, or marking a part that is likely to be defective.
- a feedforward operation is performed, such as cutting out a longitudinal area of the steel strip that includes many parts that are likely to be defective, or marking a part that is likely to be defective.
- guidance for feed packs on the production conditions of the coils to be manufactured, accumulation of data for feed packs, or feed packs themselves will be possible.
- the feed pack in the steelmaking process, for example, changing the filling speed, the filling temperature, the type of powder for continuous production, and the like, changing the heating temperature during the hot rolling process. Or changing the setting of the take-off temperature.
- the defect manifestation prediction process is scheduled for the production conditions of the steel strip, the difference from the target, the actual results, and the subsequent processes until the prediction is performed as information for prediction.
- the present invention does not predict the possibility of manifestation as surface defects from the results of surface layer property measurement alone, but rather the history of the upper process up to the measurement, the manufacturing conditions of the lower process, and the final product. Forecast using the specifications of For example, for the upper process, the chemical composition of the steel strip, the manufacturing conditions such as the heat history of the upper process and rolling conditions, the difference from the target, the past performance, and other factors are used.
- the target is the target manufacturing conditions and target product specifications at the manufacturing planning stage.
- the coiling temperature in hot rolling was set at 500 ° C before production and the actual value was 480 ° C, then both the target and the actual temperature were determined. It is used and obtained as information for prediction. Thus, it can be used in comparison with the target value and the actual value.
- a steel strip or a surface treatment having excellent surface layer properties wherein at least one of product specifications, applications, and destinations is changed based on the prediction results of the defect appearance prediction process.
- a method for producing a steel strip can also be used.
- the process of manufacturing within the scope of the product specifications, uses, and destinations grouped by common items without specifying the product specifications, uses, and destinations in advance before manufacturing is regarded as a process of manufacturing the present invention. Based on the results, one or more of the above product specifications, applications, destinations, etc. are determined, and the manufacturing process and conditions after the next process are determined to manufacture steel strip. It is also possible to provide a method for producing a steel strip or a surface-treated steel strip having excellent surface layer properties. This makes it possible to construct flexible logistics without being constrained by conventional logistics flows.
- the present invention changes or determines not only the manufacturing process conditions in the lower process, but also the final product itself, that is, the product specifications, applications, destinations, and the like, based on the prediction results of the occurrence of defects. As a result, even if defects are expected to appear, changes in specifications (grade down) or The steel plate can be effectively used by reusing it for applications that do not cause defects or for destinations.
- the defect appearance prediction process is a method of manufacturing a steel strip or a surface-treated steel strip having excellent surface layer characteristics, which utilizes information on the distribution of abnormal portions in the thickness direction of the steel strip, that is, in the depth direction. is there.
- the actualization of a defect is predicted using the distribution information on the potential defect such as an inclusion in the surface layer in the depth direction. Therefore, even if there is a potential defect that has not been revealed as a surface defect at that time, it is possible to predict the possibility of manifestation in a subsequent process. By accumulating this ⁇ ⁇ past data, the accuracy of prediction can be improved.
- the surface layer property measuring step includes the step of magnetizing the surface layer of the steel strip at the same time as the AC magnetization and measuring a change in AC magnetic flux caused by the property of the surface layer at the same time. And a method for producing a steel strip or a surface-treated steel strip having excellent surface layer properties characterized by measuring the properties of the steel strip.
- a method using magnetism is appropriate as a principle of measuring the properties of the surface layer on a production line.
- the method using AC magnetic flux is more desirable. This is because the penetration depth of the magnetic flux is limited by the effect of the skin effect as compared with the case where DC magnetization is used, and the magnetic flux concentrates near the surface layer of the steel strip, making it possible to detect the properties of the surface layer efficiently. Because you can. For the same reason, in order to measure the properties inside the surface layer, an optical surface inspection device that can detect only the surface is unsuitable.
- the surface layer property measurement step involves alternating current magnetization of the steel strip, detecting magnetic flux with two or more magnetic sensors arranged side by side substantially in the width direction of the steel strip, and detecting the difference in the width direction of the detection signal.
- a method for producing a steel strip or a surface-treated steel strip having excellent surface layer properties characterized by measuring the properties of the surface layer of the steel strip based on the divided signals.
- the magnetic flux is detected by two magnetic sensors arranged side by side in the width direction of the steel strip, and the property of the steel strip surface layer is measured based on the difference signal between the outputs of the two magnetic sensors.
- the abnormal portion of the surface layer targeted by the present invention is very small in the C section of the steel strip as described above, and is extended to a shape long in the rolling direction. The magnitude of the detected magnetic flux of such a surface property abnormality greatly differs depending on the position in the direction.
- the width direction of the steel strip means a direction perpendicular to the rolling direction of the steel strip, unless otherwise specified.
- the difference signal is obtained, for example, it is rectified and, based on the size of the rectified DC component, the degree of property abnormality (whether or not it becomes apparent in each process until final consumption is possible) Gender) can be evaluated.
- the method of rectification a method used in the conventional eddy current flaw detection method, such as a method of simply rectifying or a method of performing synchronous detection using a signal having a phase difference synchronized with the AC magnetizing current, can be used as appropriate.
- the surface layer property measuring step includes arranging the three legs of the E-shaped ferromagnetic material so as to face the steel strip surface and to be arranged in the width direction of the steel strip, respectively.
- a magnetizing device and a magnetic sensor (E-type sensor) having an E-shaped yoke are used. That is, the three legs of the E-shaped ferromagnetic material are arranged side by side substantially perpendicularly to the steel strip surface and substantially parallel to the width direction of the steel strip, and wound around the center leg.
- the alternating magnetic flux generated in the center leg flows intensively through the surface of the steel strip toward the legs on both sides, and passes through the legs on both sides to form the center. Return to leg. That is, a magnetic flux directed in the width direction of the steel strip is intensively generated. Therefore, if there is a long abnormal property in the surface layer in the length direction (rolling direction) of the steel strip, the magnetic path is interrupted, and the detected magnetic flux tends to change.
- the surface layer property measuring step includes the step of magnetizing the steel strip with an alternating current, scanning the magnetic sensor in the width direction of the steel strip, and detecting a surface property abnormality based on a change in a signal of the magnetic sensor generated by the scanning. It is also possible to provide a method for producing a steel strip or a surface-treated steel strip excellent in surface layer properties characterized by detecting a part.
- the magnetic sensor is scanned in the width direction of the steel strip, and the surface layer properties are measured based on a change in the signal of the magnetic sensor generated during the scanning.
- a change in magnetic flux can be detected, and a surface property abnormality can be detected based on the detected change.
- the direction of magnetization it is particularly effective to strongly magnetize in the width direction of the steel strip.
- the scanning in the width direction is actually scanning in the oblique direction with respect to the steel strip. It is clear that the effects of the present invention can be obtained, and the present invention includes such a case.
- the surface layer property measuring step mechanically moves the magnetic sensor in the width direction of the steel strip.
- the surface properties in the width direction of the steel strip are measured by scanning the magnetic sensor itself literally.
- the scanning means various methods such as a rail method and a pole screw driving method are known, and can be used as appropriate according to the installation location and the like.
- the surface layer property measuring step includes arranging a plurality of magnetic sensors in the width direction of the steel strip and electronically switching and selecting the magnetic sensors, thereby performing scanning in the width direction of the steel strip. And a method for producing a steel strip having excellent surface layer properties or a surface-treated steel strip.
- the surface layer property measuring step includes forming a comb-shaped ferromagnetic material having a coil wound around a leg with four or more legs facing the steel band surface.
- the surface layer is characterized by applying a current to excite it and measuring the properties of the surface layer based on the differential signal of the voltage induced in the secondary coil wound around each of the two outer legs.
- a comb-shaped yoke having a large number of legs is used, and three adjacent legs of the legs are sequentially selected and used as an E-shaped coil. Therefore, the same operation and effect as the above-described invention using the E-type sensor can be obtained, and scanning in the width direction can be performed by switching the electric coil as in the above-described invention. However, it is simple and can be reduced in failure. If necessary, increase the sensor integration
- a multi-channel sensor can be integrally formed, so that dimensional accuracy can be improved.
- the surface layer property measurement step is performed when the DC magnetization level of the excitation of the steel strip in the surface layer property measurement is substantially close to zero, and the frequency of the AC magnetization is 100 kHz to 10 MHz. It is also possible to provide a method for producing a steel strip or a surface-treated steel strip excellent in surface layer properties characterized by being within the above range.
- the range to be measured to determine whether or not the measurement part becomes obvious as a defect is limited to the surface layer, so it is preferable to concentrate magnetic flux on the surface as much as possible .
- the frequency be 100 kHz or more when the DC magnetization of steel is close to zero.
- the penetration depth should not be too shallow.
- the frequency of the AC magnetization shall be 10 MHz or less. Therefore, in the present invention, the frequency of the AC magnetization is in the range of 100 kHz to 10 MHz.
- the frequency of the AC magnetization is more preferably 1 MHz or less.
- the differential permeability is reduced, and the penetration depth can be made deeper than when DC magnetic flux is not applied, even if the same excitation frequency is used. It is. Therefore, it is also possible to control the DC magnetization level in order to achieve multiple penetration depth measurement conditions.
- the properties are not apparent at the measurement stage, and the final consumption is reached thereafter. Predict the part to be exposed in any of the steps up to and take appropriate measures such as partially removing the area including that part to efficiently produce high quality steel strip with few defects. can do.
- the steel strip is particularly effective not only for pickling steel strip and cold-rolled steel strip, but also for surface-treated steel strips such as galvanized steel strips whose defects become apparent due to their treatment.
- Embodiments of the present invention will be described with reference to FIGS. As illustrated in FIG. 10, the steps after the prediction step and the manufacturing conditions are determined. Alternatively, a part that is expected to become apparent as a defect in the future is partially removed before cold rolling.
- the defect appearance prediction step in FIG. 10 is performed by the surface layer property measuring device 13 and the defect appearance prediction device 15 as shown in FIG.
- the term “I” as used herein refers to the presence, type, and spatial distribution of abnormal parts that are different from other healthy parts. Specific examples include the penetration of schenore into the underlying steel layer, non-metallic inclusions, large irregularities at the boundary between the scale and the underlying steel layer, crystal grain size, portions with different grain properties, unevenness in components, etc. There is.
- the shape and properties of the steel strip are made uniform in subsequent processes such as rolling so that defects do not occur on the contrary due to the property change caused by the removal of the abnormal part ⁇ ⁇ Therefore, it is better to remove the abnormal part of the surface layer as upstream as possible, at least before cold rolling.
- next manufacturing timing manufacturing chance
- change of manufacturing conditions including feed pack to manufacturing conditions of steel strip to be manufactured at next manufacturing port
- process change Outputs information for determination. In this way, by predicting whether or not defects will become apparent in the subsequent process in the future, it is also possible to determine (feedback) the manufacturing conditions of the steel strip to be manufactured.
- the plate shape needs to be good for the reasons (a), (b) and (c).
- the plate shape tends to be better on the lower process side, and by applying tension, the shape is more stable on the lower process side.
- the surface layer property measurement when it is necessary to determine the sheet thickness as a manufacturing condition based on the results of surface layer property measurement, the surface layer property measurement must be performed before cold rolling. Also, for example, it is predicted whether or not surface defects will become apparent after pressing on a plated steel sheet, If marking is applied to the area where is predicted to not be used in subsequent processes, or if measures that can be performed even after plating such as cutting off the area where defects in the longitudinal direction of the steel strip are likely to occur are taken, There may be an option to measure the properties of the surface layer after plating close to the final use form. Regarding the selection of the installation position of the surface layer property measuring device, there are the following other than the above-mentioned reasons.
- the line speed should not be too fast for detecting and removing abnormal parts.
- the exit side of the hot rolling line is very high speed and is generally unsuitable.
- the prediction of whether or not it will become a defect in subsequent processes is based not only on the surface layer property measurement results, but also on the manufacturing conditions until the surface layer property measurement, and onward.
- the most relevant conditions among various conditions such as the manufacturing conditions and product specifications (including the customers of the steel strip and the use form at the stage of final consumption) planned in the process, It will be highly accurate. Specifically, it includes the type of steel, heat treatment conditions, rolling conditions, types of plating, various conditions of the steel strip production line, pressing conditions, coating conditions, final usage patterns, and the like.
- Defects or defect candidates are classified into three types, as shown in Figure 12.
- Harmful defects A Defects that occur after property measurement with a prediction device
- Harmful defect B Of the parts measured by the prediction device and detected as a signal, the measured part that is predicted to become a defect after surface layer property measurement
- Normal part a measurement site that is not expected to become apparent after surface texture measurement
- harmful defects are subjected to a surface inspection by a surface defect meter or visual inspection by a human in the final process, and the above-mentioned (1) ( 2) are both targeted for detection. If these harmful defects are, for example, very harmful, cut-away all parts of the defect.
- the degree of harm is moderate to mild, it can be determined in one coil as one shipping unit of steel strip, or every fixed steel strip length unit (for example, 50 Om or 100 Om unit).
- the defect is cut and cut off as needed to adjust the diameter of the steel strip in one coil or the defects per unit length.
- the steel strip to be inspected is, for example, a hot-dip coated steel sheet, an electro-coated steel sheet, a cold-rolled steel sheet, or an automobile. Or electrical products, how they are shipped and used as final products If the specifications or conditions change, the power that will be expected to be harmful defect B in Fig. 12 will be different. This is because, for example, defects existing in the original steel sheet under plating may become harder to see, or may be easier to see, or may also be easier to see depending on the press shape and coating conditions at the customer. However, on the contrary, it may be difficult to see. Therefore, the area of the harmful defect B in FIG. 12 becomes wider or narrower depending on conditions.
- the prediction device does not only judge each detected part, but also the entire predicted defect existing in one coil or unit length, for example, the predicted Judgment is made in consideration of the degree of defects, the number of defects, and the distribution of defect density.
- the manufacturing information storage device 16 stores information on the manufacturing conditions such as coil numbers, types, steel types indicating component characteristics, inspection conditions, customers and specifications for the steel strips whose surface layer properties are to be measured, for each steel strip. This information is transmitted to the defect manifestation prediction devices 15a and 15b until the surface property measurement is started or until the defect appearance prediction process is started. .
- the defect manifestation prediction devices 15a and 15b correspond to the surface layer property detection signals of the surface property measurement devices 13a and 13b, and the information of the steel strip from the manufacturing information storage device 16 Based on the information in the database 17, it is checked whether or not each part of the steel strip has a surface defect on the last line included in the information of the steel strip.
- a surface defect such as a hedging that becomes apparent after plating in a plated steel strip
- the type of plating hot-dip Z Plating, alloying and hot-dip plating (GA) Z Simple hot-dip plating (GI), single-layer plating / double-layer plating
- the signals of the surface layer property measuring devices 13a and 13b for example, the size (length, width, thickness) of an abnormal portion exceeding a predetermined threshold, 'The value of the feature quantity such as shape, depth position, etc., and the type of surface defect finally revealed in each process and detected by a surface defect meter or visual inspection by a human, and a grade indicating Z or degree Must be associated in advance.
- This information is a table in which the correspondence between the surface layer property measuring device signal and the surface defect detected in each manufacturing process is stored in a table, and is stored in the correspondence database 17 as a file.
- the manufacturing process is, for example, C This is a production line for AL, CGL, EGL, etc. CAL is a continuous annealing line, CGL is a continuous galvanizing line, and EGL is an electroplating line.
- This database was measured using the surface layer property measuring equipment 13a and 13b, and surface inspection was performed in each manufacturing process. If the results of each manufacturing process could be collected, The result is input as inspection information to the process computer of the manufacturing information holding device 16 which is a host computer, and then transmitted and stored in the association database 17.
- the measurement results of the manifestation prediction devices 13a and 13b are also transmitted to the association database 17 via the manufacturing information holding device 16 and stored.
- the results of the surface layer property measuring device and the results of the surface inspection in each process are associated with the steel strip using coil numbers of the steel strip, etc., and the position in the steel strip is determined not only by the transport direction but also by rolling. Considering the rolling reduction of
- the measurement signals of the surface layer property measuring devices 13a and 13b and the surface inspection results are sequentially stored, and the correspondence table is updated.
- the surface inspection result data is not limited to the process in which the steel strip was finally inspected. If the inspection was performed in the middle of the process up to the final stage, the data was also entered and a corresponding table was created. Go. Then, based on this table, the logic of the prediction judgment of the defect manifestation prediction devices 15a and 15b is created. Alternatively, judgment data may be created by inputting table data into a logic automatic generation tool such as a neural network.
- defect manifestation prediction device 15 determines which manufacturing process is the target steel strip to be predicted and selects a process route. The result of this prediction is transmitted to the manufacturing information storage device 16, and the subsequent steel strip process route is changed.
- the steel strip is considered as a candidate based on the manufacturing conditions before the defect appearance prediction devices 15a and 15b, for example, steel type.
- the distribution route of the steel strip may be selected one after the prediction judgment result according to the prediction judgment result based on the number of types, customers, and specification applications. As described above, according to the present invention, the distribution route and the like can be made flexible.
- Figures 13 and 14 show examples of the process for determining the manufacturing process and manufacturing conditions according to the prediction results.
- the surface layer properties are measured, and a defect appearance prediction is performed under the condition of the product type 1.
- the measurement result is compared with the data of the association table stored in the association database 17 to determine whether or not the surface layer properties can be applied to the product type 1.
- Pass / Fail Judgment is made not only for each surface layer property measurement site, for example, but also for one coil of steel strip or the number of exposed defects per unit length. May be. For example, even if the number of actual defects is one, if the degree of defect is predicted to be heavy, it is rejected.If the degree of defect is medium to light, the number of defects in one coil or per unit length is, for example, If the number exceeds 5, perform processing to judge it to be rejected.
- the surface properties were measured, and it was predicted that sufficient quality could be ensured if the subsequent manufacturing process was performed as an alloyed hot-dip galvanized steel sheet, which is used as a high-grade automotive skin.
- the ⁇ was subjected to a specified manufacturing process, such as rolling it to an appropriate thickness as an automotive skin, and as a result of the above prediction, it was considered unsuitable as an automotive skin alloyed hot-dip galvanized steel sheet.
- it is predicted that it can be used as a general building material it will be necessary to change the destination of the delivery customer, roll it to a thickness corresponding to it, and use a non-alloyed plated steel sheet. Determine the following manufacturing conditions and product specifications (including destinations).
- the rejected part of the steel strip is cut and removed, or ground and harmless, and the subsequent processing is performed as scheduled.
- the portion where the defect appearance is predicted is removed in the entire width direction and only the normal portion is connected, or the peripheral portion of the defect occurrence predicted portion is rendered harmless to obtain a normal steel strip. You can also.
- the method of determining the defect appearance prediction according to the present invention may be performed by combining the processes of FIGS. 13 and 14, not independently, and may be limited to the processes based on FIGS. 13 and 14. Absent.
- FIG. 8 is a diagram for explaining an example of the embodiment of the present invention.
- a surface layer property measuring device 13 is provided after the entrance-side leveler 11, and a defect manifestation prediction device is provided. 15 to predict whether or not the abnormal property part will become a defect in the subsequent process.Then, the surface property abnormal part removal device 14 determines the part to be removed from the part and removes the area including the part to be removed.
- FIG. 5 is a diagram illustrating a manufacturing method for removing by a removing unit.
- a surface layer property measuring device one that accurately measures the properties of abnormal surface properties that are very small in the C section and long in the rolling direction, as shown in Figs. 1 to 6, is used. I have.
- the unevenness of the plate is reduced by the leveler 11 installed on the pickling line entry side. After that, at the position where the tension on the plate is large and it is wrapped around the large-sized bridle rolls 12 a to l 2 d, the surface layer is opposite to the bridle rolls 12 a to l 2 d with the steel strip 1 interposed.
- Property measuring device 13a for steel strip front side
- 13b for steel strip backside
- surface layer property abnormality removal device 14a for steel strip front side
- 14b for steel strip backside
- the front side defect appearance prediction device 15a and the back side defect appearance prediction device are 15.
- the unit tension of the steel strip at the position where the surface layer property measuring device is installed is preferably 0.3 kgf / thigh 2 or more in order to suppress fluttering of the plate and reduce lift-off fluctuation. Since the front and back systems operate independently in principle, for simplicity, the front side will be described below, but the same applies to the back side.
- the main points of interest are the size (length in the rolling direction, length in the width direction, thickness), shape, and depth position, including the area under the surface of the steel sheet. .
- the method using AC magnetic flux should be evaluated by using the two-dimensional distribution of signal amplitude and phase after synchronous detection as measurement result data.
- the phase contains information on the depth position of the property abnormality
- the excitation frequency of the AC magnetic flux by changing the excitation frequency of the AC magnetic flux, the penetration depth of the magnetic flux from the surface of the steel sheet changes. More detailed information on the distribution of the surface layer in the depth direction (thickness, depth position, etc.) can be obtained.
- the surface layer '14 -shaped measuring device 13a is installed at the above-mentioned position in the line in order to suppress plate fluttering, lift-off fluctuation due to plate deformation and contact of the steel strip with the sensor.
- the surface layer property measuring device 13a transmits a signal value or the like at each measuring point on the steel strip to the defect revealing predicting device 15a.
- the data to be transmitted can include not only the synchronous detection signal amplitude at each of the above measurement points but also the synchronous detection phase.
- the excitation frequency of the AC magnetic flux is not limited to one type, and when using multiple types, the signal value and the synchronous detection phase can be increased by the number of frequencies.
- the defect manifestation prediction device 15a evaluates the properties of the surface layer based on the information from the surface layer property measurement device 13a, and determines whether or not the abnormal property portion becomes a defect in the next process and thereafter. Predict.
- FIG. 11 is a diagram showing a prediction flow using an AC magnetic flux. Firstly, the surface layer measurement corresponding to the two-dimensional coordinates of the steel strip is performed using the AC magnetic flux. Two-dimensional coordinates are represented by the longitudinal direction X (m) and the width direction y (m). Synchronous detection amplitude A at each point
- (x, y) and phase P (x, y) data are collected.
- the synchronous detection amplitude and phase data at each point are sent to the defect manifestation prediction device.
- the nearby abnormal indicator is recognized as the same abnormal unit, and the unit is "predicted” as to whether or not it will become a defect. For example, a certain threshold value is set for the synchronous detection signal amplitude, and a two-dimensional coordinate point on the steel strip having a signal value exceeding that threshold value is temporarily extracted as an abnormal part candidate point.
- each abnormal part candidate point is recognized for each lump (labeling processing), and the feature amount (rolling direction length, width direction length, area, etc.), thickness, and synchronous detection phase information of each two-dimensional area are recognized.
- the synchronous detection phase information is an amount that reflects the position of the signal source in the depth direction, it is evaluated as depth position information by, for example, obtaining a conversion coefficient from phase to depth in advance.
- the prediction is made based on the feature amount and depth position data for each labeled area.
- the depth position (which can be estimated from the phase) is shallower than a certain threshold, the width is wider than a certain threshold, and the synchronous detection amplitude is larger than a certain threshold, it is predicted that the defect will be manifested as a defect.
- the abnormal property near the surface is emphasized and the measurement is performed. It is possible to evaluate.
- a specific example of a method of measuring the properties of the surface layer of a steel strip after hot rolling and before cold rolling, and predicting whether or not the measured portion will become a defect before performing alloying hot-dip plating a specific example is as follows. There is a method of using the signal amplitude level and phase after synchronous detection. It is known that an abnormal part located at a position shallower than a certain depth from the surface and having a certain size or more in the rolling direction becomes apparent as a surface defect before plating. Thus, as a prediction method, as shown in FIG. 16, after obtaining coil information from the manufacturing information holding device, which is a higher-level computer, a signal having a certain level or more such that the signal level is equal to or more than a predetermined threshold is obtained.
- a threshold value is set to determine in which process it can be used. For example, based on the above idea, it is determined whether or not the force that can be used for C A L, C G L, and E G L is within the range of the depth position as shown in FIG.
- C AL is a continuous annealing line
- C G L is a continuous hot dipping line
- E G L is an electroplating line.
- the depth position ⁇ A means that the defect is located at a position shallower than the depth A.
- the values of A, B, C, and D are positive values, and the greater the value, the greater the value. The value increases from A to D, and the depth increases.
- Another example of the prediction is to investigate in advance what synchronous detection amplitude level the part that will be a surface defect after plating will have at the pickling stage, and that the synchronous detection amplitude level has exceeded a certain threshold ⁇ ⁇ Furthermore, if it is predicted that surface defects will occur after plating, and if it is smaller than the threshold value, it will not be surface defects, the prediction method itself can be a simple method.
- the threshold value and the prediction algorithm are selected based on the manufacturing condition targets and results up to the time when the prediction is made, and on the product specifications such as the manufacturing conditions, applications, and inspection specifications that will be planned thereafter.
- the surface property abnormal part removing device 14a is based on the surface property abnormal part position (longitudinal direction, width direction, depth direction) to be removed from the defect manifestation prediction device 15a, and the surface property abnormal part length information.
- the area including the abnormal property part is partially removed by grinding or cutting.
- the surface property abnormal part removing device 14a is also installed at a position in the line where there is little influence of plate flapping and plate deformation as in the defect candidate auxiliary part detecting device 13a in order to stably remove the surface property abnormal part. It is.
- the entire operation sequence is controlled by a sequencer (not shown).
- Fig. 1 is a schematic diagram showing the configuration of the surface layer property measuring device (width direction difference method).
- the steel sheet 1 has a surface property abnormality 2 which is minute in the width direction and long in the length direction (perpendicular to the paper).
- An alternating current is supplied to the coil of the magnetizer 4 by the magnetizing power supply 3 to intensively magnetize the surface layer of the steel sheet 1.
- the magnetization is performed so that the magnetic flux is formed in the width direction of the steel sheet 1.
- Defects that appear in any of the processes up to final consumption such as the surface defects of the plated steel sheet described above, are caused by non-magnetic metal inclusions generated in the steelmaking process, or It is said that the origin is on the upper process side in all manufacturing processes, such as when oxides are mixed into steel material on the side of the process and hot rolling process (before hot rolling).
- the steel sheet is greatly reduced through hot rolling, so that in the step of measuring the properties in the present invention, the C section (cross section when the steel strip is cut in the ⁇ ⁇ direction) is very small, and the section in the rolling direction is very small. Stretched into a long shape.
- a method is adopted in which the properties of the abnormal portion can be easily measured.
- the magnetic flux existing outside the steel plate 1 is detected by the two magnetic sensors 5a and 5b.
- the magnetic flux detected by the magnetic sensor 5a is more magnetic.
- the magnetic flux is larger than the magnetic flux detected by the sensor 5b, and the output of the magnetic sensor 5a is Larger than the output of the sensor 5b.
- these outputs are guided to the differential amplifier 6, and the output is input to the phase detector 7, and the phase is detected by the signal synchronized with the waveform of the magnetization power supply 3 (the phase may be shifted).
- a signal corresponding to the size of the abnormal surface property portion 2 is obtained.
- This output is guided to the surface property abnormality portion level discriminator 8, and is compared with a predetermined threshold to determine the level of the surface property abnormality portion 2.
- the abnormal property part 2 on the surface layer is minute in the width direction of the steel sheet but is long in the length direction. An abnormal surface property signal is obtained.
- abnormalities in surface properties are determined by the differential signals of the outputs of the two sensors, so that noise common to the sensors (such as changes in the magnetic permeability of the steel sheet) and external noise Are canceled out, and it is possible to detect abnormal surface properties with a good S / N ratio
- Fig. 2 shows an outline of the configuration of the surface layer property measuring device (E-type sensor system).
- E-type sensor system the same components as those shown in the preceding drawings are denoted by the same reference numerals, and description thereof may be omitted.
- an E-shaped coil 9 is used as a magnetizer and a magnetic sensor.
- the yoke of the E-shaped coil 9 has three legs 9a, 9b, and 9c, and the yoke is formed on the steel sheet 1 so that each is substantially perpendicular to the surface of the steel sheet 1 and each is arranged in the width direction of the steel sheet 1. They are provided facing each other.
- the coil wound around the center leg 9 a is supplied with an alternating current from the magnet 3 and magnetized.
- a coil is wound around the legs 9b and 9c on both sides, and is used as a magnetic sensor.
- the magnetic flux generated by the coil of the leg 9a passes near the surface of the steel sheet 1 and returns to the leg 9a through the legs 9b and 9c on both sides.
- the magnetic resistance to the magnetic flux passing through the legs 9a and 9b becomes larger than the magnetic resistance to the magnetic flux passing through the legs 9a and 9c.
- the magnetic flux density of the magnetic flux passing through the leg 9b becomes smaller than the magnetic flux density of the magnetic flux passing through the leg 9c. Therefore, the voltage induced in the coil wound on the leg 9b becomes smaller than the voltage induced on the coil wound on the leg 9c. Then, a voltage corresponding to the difference between the two is output.
- the signal is guided to the phase detector 8 and phase-detected by a signal synchronized with the waveform of the magnetizing power supply 3 (the phase may be shifted), whereby a signal corresponding to the size of the surface property abnormality 2 is obtained.
- This output is guided to the surface property abnormal part level discriminator 8 and is compared with a predetermined threshold to determine the level of the surface property abnormal part 2.
- Fig. 3 shows a part of the configuration (mechanical width scanning method) of the surface layer property measuring device.
- the steel plate 1 is AC magnetized in the width direction of the plate by a magnetizing device (not shown).
- the magnetic sensor 5 is scanned in the width direction of the plate, and changes in the output over time are observed.
- the abnormal surface property portion 2 exists, the magnetic flux detected at that portion changes, and the output of the magnetic sensor changes.Therefore, the abnormal surface property portion 2 can be detected by performing signal processing on the output of the magnetic sensor 5. .
- the inspection range becomes a zigzag range.However, if the scanning range is shortened by increasing the number of magnetic sensors and the running speed is increased, the inspection range becomes longer than the specified length.
- Surface layer abnormalities can be detected.
- Fig. 4 shows a part of the configuration of the surface layer property measuring device (electron scanning method). Also in this surface layer property measuring device, the steel sheet 1 is AC magnetized in the sheet width direction by a magnetizing device (not shown).
- the surface layer property measuring device a large number of magnetic sensors 5 are arranged in the width direction of the steel plate 1.
- the output of the magnetic sensor 5 is connected to a scanner, and the output of one magnetic sensor selected sequentially is subjected to signal processing. In this way, scanning equivalent to the mechanical scanning in FIG. 3 can be performed electronically. Since this scanning can be performed at a high speed, the length in the longitudinal direction of the abnormal surface layer property that can be detected can be shortened.
- the output of one magnetic sensor 5 is processed sequentially to detect the surface property abnormality from its temporal change. Input the output sequentially, calculate the difference between the two magnetic sensors, and The surface property abnormality part may be detected by the processing.
- Fig. 5 shows a part of the configuration (comb sensor type) of the surface layer property measuring device in the present embodiment.
- Fig. 5 mainly shows the magnetizing device and the magnetic sensor, and the steel plate and the signal processing circuit are not shown.
- Each leg force of the comb-shaped ferromagnetic body 10 having a comb shape is arranged substantially perpendicular to the surface of the steel sheet and arranged in the width direction of the steel sheet. A coil is wound on each leg.
- the electric path is switched electronically or electrically, and as shown in (b), using the second to fourth legs from the left end, the coil wound around the leg 10c is used.
- the magnetic flux is excited, and the magnetic flux is detected by the coils wound on the left and right legs 10b and 10d.
- the same detection is performed using three legs on the right side one by one.
- this operation corresponds to scanning the detector in the width direction of the steel sheet, and the vehicle can travel without mechanical movement over a wide width range.
- the switching of the exciting coil and the detecting coil may be performed by using an electronic switch, or may be performed by a relay or the like.
- the sensor and the comb-shaped legs are arranged as shown in FIGS. 4 and 5, one or more pairs of sensor rows or comb-shaped ferromagnetic materials are arranged, and the sensors and the comb-shaped legs are staggered. When they are arranged in a shape, it is possible to detect a surface property abnormality portion without a gap in the width direction.
- the staggered arrangement depends on the shape of the sensor (including the frame of the sensor unit).
- the waveform as shown in FIG. 6 (b) is obtained because the surface property abnormal portion having the elongated shape having the long side in the rolling direction is scanned in the sheet width direction.
- Fig. 7 (a) even if the abnormally elongated surface layer property in the rolling direction was scanned in the rolling direction, no large signal was obtained as shown in Fig. 6 (b), and as shown in Fig. 7 (b). Only a small output is obtained. Therefore, it is difficult to accurately detect abnormally long and thin surface layer properties in the rolling direction by scanning in the rolling direction.
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Abstract
Description
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CNB038259524A CN1311235C (zh) | 2003-08-13 | 2003-08-13 | 钢带或表面处理钢带的制造方法 |
PCT/JP2003/010294 WO2005016566A1 (ja) | 2003-08-13 | 2003-08-13 | 鋼帯または表面処理鋼帯の製造方法 |
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JP3271246B2 (ja) * | 1999-02-08 | 2002-04-02 | 日本鋼管株式会社 | 漏洩磁束探傷法及び漏洩磁束探傷装置並びに製鉄プラント |
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