Method and system for detecting pickling property of steel

Abstract

The invention provides a hot-rolled steel pickling property detection method and system. The method comprises the following steps: dividing a target hot-rolled steel sample into an upper surface test sample and a lower surface test sample; the acid-resistant coating covers the lower surface and the side surface of the upper surface test sample and the upper surface and the side surface of the lower surface test sample, and weighing is performed to obtain a first initial mass corresponding to the upper surface test sample and a second initial mass corresponding to the lower surface test sample; the upper surface test sample and the lower surface test sample are subjected to acid pickling according to preset acid pickling test parameters, and the preset acid pickling test parameters comprise acid pickling duration; calculating a difference value between the first initial mass and the mass of the upper surface test sample after pickling to obtain a first mass loss value; and based on the ratio of the first mass loss value to the surface area of the upper surface test sample and the ratio of the second mass loss value to the surface area of the lower surface test sample, the pickling property of the target steel is determined.

Description

Technical Field

[0001] The present application relates to the technical field of metal detection, and in particular to a method and system for detecting the pickling property of hot-rolled steel. Background Art

[0002] After hot-rolled steel strip is rolled and then slowly cooled, the surface of the steel strip is oxidized to form a layer of iron oxide. Generally speaking, pickling is required to remove the iron oxide on the surface to ensure the surface quality of the produced steel strip. However, the formation process of iron oxide is related to many factors, and it is often necessary to conduct relevant pickling simulation tests to determine the specific pickling process and ensure the pickling quality.

[0003] However, due to the difference between the contact and non-contact between the upper and lower surfaces of the steel strip and the track during hot rolling, and the difference in the residence time of the cold water on the upper and lower surfaces, the structure and thickness of the iron oxide scale on the upper and lower surfaces will be different. Therefore, during the pickling simulation test, one surface and one side of the steel strip are often sealed to analyze the difference in pickling between the upper and lower surfaces separately. Existing sealing technologies, such as the use of acid-insoluble silica gel for sealing, may cause gaps between the steel sample and the sealing material if the steel strip sample is not straight enough. During the pickling simulation test, the pickling liquid is easily poured in and covers the part that needs to be sealed, causing errors in the results of the pickling simulation test and inaccurate results of the steel pickling ability. Summary of the invention

[0004] The embodiments of the present application provide a method and system for detecting the pickling property of hot-rolled steel, which can improve the accuracy of the pickling property results of steel.

[0005] In a first aspect, the present application provides a method for detecting the pickling property of hot-rolled steel, comprising:

[0006] The target hot-rolled steel sample is divided into an upper surface test sample and a lower surface test sample, wherein the upper surface and the lower surface are two hot-rolled surfaces of the hot-rolled steel sample;

[0007] Covering the lower surface and side surfaces of the upper surface test sample and the upper surface and side surfaces of the lower surface test sample with an acid-resistant coating, and weighing them to obtain a first initial mass corresponding to the upper surface test sample and a second initial mass corresponding to the lower surface test sample;

[0008] Pickling the upper surface test sample and the lower surface test sample according to preset pickling test parameters, wherein the preset pickling test parameters include pickling time;

[0009] Calculate the difference between the first initial mass and the mass of the upper surface test sample after pickling to obtain a first mass loss value;

[0010] Calculate the difference between the second initial mass and the mass of the lower surface test sample after pickling to obtain a second mass loss value;

[0011] The pickling property of the target steel material is determined based on the ratio of the first mass loss value to the surface area of ​​the upper surface test sample and the ratio of the second mass loss value to the surface area of ​​the lower surface test sample.

[0012] In some possible implementations, pickling the upper surface test sample and the lower surface test sample according to preset pickling test parameters includes:

[0013] Using a first magnet to adsorb the lower surface of the upper surface test sample;

[0014] Using a second magnet to adsorb the upper surface of the lower surface test sample;

[0015] Moving the first magnet and the second magnet so that the upper surface test sample and the lower surface test sample are immersed in the pickling liquid;

[0016] According to preset pickling test parameters, the upper surface test sample and the lower surface test sample are pickled by the pickling liquid.

[0017] In some possible implementations, after moving the first magnet and the second magnet so that the upper surface test sample and the lower surface test sample are immersed in the pickling liquid, the method further includes:

[0018] The pickling liquid is vibrated at a preset frequency by means of a vibration instrument.

[0019] In some possible implementations, the moving the first magnet and the second magnet so that the upper surface test sample and the lower surface test sample are immersed in the pickling liquid includes:

[0020] Moving the first magnet so that the upper surface of the upper surface test sample is located below the liquid level of the pickling liquid and the lower surface of the upper surface test sample is located above the liquid level of the pickling liquid;

[0021] The second magnet is moved so that the lower surface of the lower surface test sample is located below the liquid level of the pickling liquid and the upper surface of the lower surface test sample is located above the liquid level of the pickling liquid.

[0022] In some possible implementations, before covering the lower surface and side surfaces of the upper surface test sample and the upper surface and side surfaces of the lower surface test sample with an acid-resistant coating and weighing them to obtain a first initial mass corresponding to the upper surface test sample and a second initial mass corresponding to the lower surface test sample, the method further includes:

[0023] Immersing the upper surface test sample and the lower surface test sample in a container containing an organic detergent and using an ultrasonic instrument to ultrasonically clean the test samples;

[0024] Ultrasonic waves are emitted to the organic solvent by an ultrasonic generator.

[0025] In some possible implementations, the step of covering the lower surface and side surfaces of the upper surface test sample and the upper surface and side surfaces of the lower surface test sample with an acid-resistant coating, and weighing them to obtain a first initial mass corresponding to the upper surface test sample and a second initial mass corresponding to the lower surface test sample comprises:

[0026] Covering the lower surface and side surfaces of the upper surface test sample and the upper surface and side surfaces of the lower surface test sample with an acid-resistant coating;

[0027] When the acid-resistant coating is dry, the upper surface test sample and the lower surface test sample are weighed to obtain a first initial mass corresponding to the upper surface test sample and a second initial mass corresponding to the lower surface test sample.

[0028] In some possible implementations, after pickling the upper surface test sample and the lower surface test sample according to preset pickling test parameters, the method further includes:

[0029] Determining the complete pickling time of the upper surface test sample and the lower surface test sample;

[0030] The step of determining the pickling property of the target steel material based on the ratio of the first mass loss value to the surface area of ​​the upper surface test sample and the ratio of the second mass loss value to the surface area of ​​the lower surface test sample comprises:

[0031] Obtaining a first pickling loss rate based on a ratio of the first mass loss value to the surface area of ​​the upper surface test sample;

[0032] Obtaining a second pickling loss rate based on a ratio of the second mass loss value to the surface area of ​​the lower surface test sample;

[0033] The pickling property of the target steel material is determined based on the product of the first pickling loss rate and the second pickling loss rate and the complete pickling time.

[0034] In some possible implementations, after determining the pickling property of the target steel material based on the first pickling loss rate and the product of the second pickling loss rate and the complete pickling time, the method further includes:

[0035] When the product of the first pickling loss rate and the complete pickling time is within a first preset range, and the product of the second pickling loss rate and the complete pickling time is within a second preset range, the preset pickling test parameters are determined as the steel pickling scheme parameters corresponding to the target steel.

[0036] In some possible implementations, after pickling the upper surface test sample and the lower surface test sample according to preset pickling test parameters, the method further includes:

[0037] Washing the upper surface test sample and the lower surface test sample with water;

[0038] Cold air is blown toward the washed upper surface test sample and the washed lower surface test sample to dry the washed upper surface test sample and the washed lower surface test sample.

[0039] In a second aspect, the present application provides a hot-rolled steel pickle-washability detection system, the steel pickle-washability detection system comprising a pickling device and a controller, the pickling device being used to pickle a test sample, the controller being used to control the system, and the steel pickle-washability detection system implementing the steel pickle-washability detection method described above when in operation.

[0040] The steel pickleability detection method provided in the embodiment of the present application uses an acid-resistant coating to cover the lower surface and side surfaces of the upper surface test sample and the upper surface and side surfaces of the lower surface test sample, and weighs them. Then, pickling is performed to obtain the mass loss value of the upper surface test sample and the lower surface test sample caused by pickling, and then the ratio thereof to the surface area is calculated to determine the pickleability of the target steel. By using the acid-resistant coating, the surface of the test sample that does not require pickling test can be completely covered, and it is tightly combined with the test sample, and there will be no gaps that cause errors in the results of the pickling test, and the pickleability results of the steel can be accurately obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The present application can be better understood from the following description of the specific embodiments of the present application in conjunction with the accompanying drawings, in which:

[0042] Other features, objects and advantages of the present application will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings, in which the same or similar reference numerals represent the same or similar features.

[0043] Figure 1 It is a schematic flow chart of a method for detecting pickle washability of steel provided in one embodiment of the present application;

[0044] Figure 2This is a schematic diagram of the pickling state of a test sample provided by an embodiment of the present application;

[0045] Figure 3 This is a schematic diagram of the pickling state of the test sample provided by another embodiment of the present application;

[0046] Figure 4 This is a schematic diagram of the pickling rates of the upper and lower surfaces of steels with different compositions provided by an embodiment of the present application. DETAILED DESCRIPTION

[0047] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0048] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0049] In the process of strip manufacturing, the hot-rolled strip is rolled and then coiled, and then slowly cooled. During this process, the surface of the strip is oxidized to form a layer of iron oxide. The iron oxide scale on the surface of the strip varies due to the chemical composition of the steel, the surface temperature of the strip during rolling, the heating temperature, the final rolling temperature, the cooling system, and the oxygen content of the surrounding medium. The pickling ability of hot-rolled strip is related to many factors, such as the adhesion strength of the iron oxide, the composition of the steel, the type and degree of mechanical deformation, the structure and thickness of the iron oxide, surface contamination (such as contamination caused by grease), surface defects, the type and composition of the pickling agent, and the working conditions during pickling. Therefore, the study of the pickling ability of the iron oxide scale not only needs to start from the analysis of the structure and thickness of the iron oxide scale itself, but also often needs to be combined with relevant pickling simulation tests to study the pickling ability of the iron oxide scale, continuously optimize the hot rolling system and pickling process, save costs, increase the speed of the strip during pickling, and increase the pickling capacity under the premise of ensuring the pickling quality.

[0050] However, due to the differences in non-contact and contact between the upper and lower surfaces of the strip and the track during hot rolling, and the differences in the residence time of the cold water on the upper and lower surfaces, the structure and thickness of the iron oxide scale on the upper and lower surfaces will be different, which will affect the pickling properties. Therefore, in the pickling simulation test, the differences in pickling of the upper and lower surfaces are often analyzed separately, so that the differences in the cooling process of the upper and lower surfaces can be formulated in more detail. Therefore, how to seal one of the surfaces and the side is particularly important. The traditional sealing method is to use cold or hot mounting, or to use acid-insoluble silicone to seal the back and sides. When the samples are not straight enough, these methods will cause the bottom liquid to be poured in and cover part of the bottom, affecting the calculated surface area. In addition, the sample size is limited during pickling with the above methods, and bundling operations are required for pickling tests. Bundling also affects the pickling area when the sample is thin.

[0051] The inventors have studied the above problems and found that if an acid-resistant coating is used to seal the samples during the pickling test, the problems of limited size of the sealed side and one surface sample during the pickling test, inaccurate calculation of the pickling surface area, and difficulty in fixing during pickling can be solved.

[0052] In order to solve the problems of the prior art, the embodiment of the present application provides a method and system for detecting the pickling property of hot-rolled steel. The method for detecting the pickling property of steel provided in the embodiment of the present application is first introduced below.

[0053] Figure 1 FIG. 1 is a flow chart of a method for detecting the pickling property of steel provided by an embodiment of the present application. Figure 1 As shown, the method includes the following steps S101 to S105.

[0054] Step S101: Divide the target hot-rolled steel sample into an upper surface test sample and a lower surface test sample, where the upper surface and the lower surface are two hot-rolled surfaces of the hot-rolled steel sample.

[0055] In a specific implementation, multiple test samples are cut from the target hot-rolled steel sample. The production process of the steel may result in surface differences, and the upper and lower surfaces of the steel are distinguished based on the surface differences. For example, due to the difference in non-contact and contact between the upper and lower surfaces and the track during the hot rolling process of the steel, the difference in the residence time of the cold water on the upper and lower surfaces, etc., there will be differences in the structure and thickness of the oxide scale on the upper and lower surfaces. Therefore, the target hot-rolled steel sample can be divided into an upper surface test sample and a lower surface test sample, that is, a sample tested on the upper surface of the steel and a sample tested on the lower surface of the steel.

[0056] As another example, the cut samples may be marked to clearly identify the upper and lower surfaces.

[0057] Step S102: Cover the lower surface and side surfaces of the upper surface test sample and the upper surface and side surfaces of the lower surface test sample with an acid-resistant coating, and weigh them to obtain a first initial mass corresponding to the upper surface test sample and a second initial mass corresponding to the lower surface test sample.

[0058] In a specific implementation, the acid-resistant coating is used to cover the lower surface and side of the upper surface test sample and the upper surface and side of the lower surface test sample, that is, the upper surface of the upper surface test sample is not covered, and the lower surface of the lower surface test sample is not covered. Ensure that the coating is uniform and sealed, and there is no missing coating or excessive coating. Weigh the coated samples, and record the first initial mass corresponding to the upper surface test sample and the second initial mass corresponding to the lower surface test sample.

[0059] As another example, the sample surface may be properly cleaned and treated before being covered with the acid-resistant coating to ensure that the coating can adhere firmly to the surface.

[0060] Step S103: pickling the upper surface test sample and the lower surface test sample according to preset pickling test parameters, wherein the preset pickling test parameters include pickling time.

[0061] In the specific implementation, the equipment and materials required for the pickling test, such as the pickling tank, pickling solution, heating equipment and timer, can be prepared in advance. According to the preset pickling test parameters, including the type and concentration of the pickling solution and the pickling time, the above-mentioned pickling test equipment is set and adjusted accordingly. Place the upper surface test sample and the lower surface test sample in the pickling tank respectively, and ensure that the samples are completely immersed in the pickling solution. Start the heating equipment to keep the pickling solution at the preset temperature. Pickle according to the pickling time in the preset pickling test parameters.

[0062] Step S104: Calculate the difference between the first initial mass and the mass of the upper surface test sample after pickling to obtain a first mass loss value.

[0063] In a specific implementation, the upper surface test sample after pickling is weighed again, and the mass value after pickling is recorded. The first initial mass is subtracted from the mass after pickling to obtain a first mass loss value.

[0064] Step S105: Calculate the difference between the second initial mass and the mass of the lower surface test sample after pickling to obtain a second mass loss value.

[0065] In a specific implementation, the lower surface test sample after pickling is weighed again, and the mass value after pickling is recorded. The second initial mass is subtracted from the mass after pickling to obtain a second mass loss value.

[0066] Step S106: based on the ratio of the first mass loss value to the surface area of ​​the upper surface test sample and the ratio of the second mass loss value to the surface area of ​​the lower surface test sample, the pickling property of the target steel is determined.

[0067] In a specific implementation, the ratio of the first mass loss value to the surface area of ​​the upper surface test sample is calculated to obtain the corresponding pickling loss rate, and the pickling condition of the first test sample is determined based on the product of this pickling loss rate and the complete pickling time. The ratio of the second mass loss value to the surface area of ​​the lower surface test sample is calculated to obtain the corresponding pickling loss rate, and the pickling condition of the second test sample is determined based on the product of this pickling loss rate and the complete pickling time. Based on these two pickling conditions, the changes in the target steel during the pickling process can be determined, and then the pickling property of the target steel can be obtained. For example, if these two pickling conditions are relatively consistent with expectations, it means that the target steel has good pickling property; otherwise, it may indicate that the pickling property of the target steel is poor.

[0068] The steel pickleability detection method provided in the above embodiment of the present application uses acid-resistant coating to cover the lower surface and side of the upper surface test sample and the upper surface and side of the lower surface test sample, and weighs them. Then pickling is performed to obtain the mass loss value of the upper surface test sample and the lower surface test sample caused by pickling, and then the ratio thereof to the surface area is calculated to determine the pickleability of the target steel. By using acid-resistant coating, the surface of the test sample that does not need pickling test can be completely covered, and it is tightly combined with the test sample, and there will be no gaps that cause errors in the results of the pickling test, and the steel pickleability results can be accurately obtained.

[0069] In order to make it easier to fix the sample during pickling, in some embodiments, the above S103 may include steps A1 to D1:

[0070] Step A1: Use a first magnet to adsorb the lower surface of the upper surface test sample.

[0071] Step B1: Use a second magnet to adsorb the upper surface of the lower surface test sample.

[0072] In a specific implementation, the first magnet is placed on the lower surface of the upper surface test sample, and it is ensured that the magnet can firmly adsorb the sample, that is, the first magnet adsorbs the side of the upper surface test sample coated with acid-resistant paint to avoid adsorbing the surface that needs to be pickled, affecting the reaction between the sample and the pickling liquid, and causing errors in the results. The process of using the second magnet to adsorb the upper surface of the lower surface test sample is similar to that described above and will not be repeated here.

[0073] As another example, the first magnet and the second magnet may be electromagnets. In this way, the electromagnets can absorb the test sample when powered on and can put down the test sample when powered off, so that the test sample can be moved more conveniently.

[0074] Step C1: moving the first magnet and the second magnet to immerse the upper surface test sample and the lower surface test sample into pickling liquid.

[0075] In a specific implementation, ensure that the pickling container is ready, including filling it with enough pickling liquid to cover the entire sample to be tested. Place the first magnet and the second magnet at appropriate positions on the upper surface test sample and the lower surface test sample respectively, so that they can firmly adsorb the samples. Move the first magnet and the second magnet, and move the upper surface test sample and the lower surface test sample together until they are completely immersed in the pickling tank. You can refer to Figure 2 , Figure 2 Taking the first magnet as an example, those skilled in the art can understand that the steps related to using the second magnet are similar to those for the first magnet, so they will not be repeated here. Figure 2In the pickling container 201 , a pickling liquid 202 is contained, and a first magnet 203 adsorbs an upper surface test sample 204 , so that the upper surface test sample 204 is immersed in the pickling container 201 .

[0076] Step D1: According to preset pickling test parameters, the upper surface test sample and the lower surface test sample are pickled by the pickling liquid.

[0077] In a specific implementation, the upper surface test sample and the lower surface test sample are moved from their previous positions to the pickling tank. Ensure that the sample is completely immersed in the pickling liquid and that the pickling liquid can cover the entire sample surface. According to the preset pickling test parameters, the conditions during the pickling process are controlled, including the temperature of the pickling liquid, the immersion time, etc. The temperature control device is used to ensure that the pickling liquid remains within the required temperature range, and the pickling time is set according to the test requirements. Thus, the pickling is completed.

[0078] In the above embodiment of the present application, the first magnet is used to adsorb the lower surface of the upper surface test sample, the second magnet is used to adsorb the upper surface of the lower surface test sample, and then the magnets are moved to allow the upper surface test sample and the lower surface test sample to be immersed in the pickling liquid for pickling. The use of magnets for adsorption and fixation makes it easier to fix the sample during pickling.

[0079] In order to make the result of the pickling test closer to the actual situation, in some embodiments, after C1, the method may further include:

[0080] The pickling liquid is vibrated at a preset frequency by means of a vibration instrument.

[0081] In a specific implementation, a vibration instrument for vibrating the liquid is prepared in advance, and the pickling tank containing the upper surface test sample and the lower surface test sample is placed on the vibration instrument, ensuring that the pickling tank is firmly mounted on the vibration platform and the sample is completely immersed in the pickling liquid. According to the preset frequency requirements, the vibration frequency of the vibration instrument is set. After setting the vibration parameters, the vibration instrument is started to start vibrating the pickling liquid at the preset frequency.

[0082] The above-mentioned embodiments of the present application use a vibration instrument to vibrate the pickling liquid at a preset frequency to simulate the pickling turbulence that may be generated during actual pickling, so that the results of the pickling test are closer to the actual situation.

[0083] In order to prevent the pickling liquid from contacting the surface that does not need pickling, in some embodiments, the above C1 may include steps A2 to B2:

[0084] Step A2: Move the first magnet so that the upper surface of the upper surface test sample is lower than the liquid level of the pickling liquid and the lower surface of the upper surface test sample is higher than the liquid level of the pickling liquid.

[0085] In a specific implementation, a manual or automatic control device is used to move the first magnet so that the upper surface test sample meets the preset position requirement, that is, the upper surface of the upper surface test sample needs to be lower than the liquid level of the pickling liquid, and the lower surface needs to be higher than the liquid level. Figure 3 By moving the first magnet to allow the liquid level of the pickling liquid 202 to be within the side range of the upper surface test sample 204, the pickling liquid 202 can completely cover the upper surface of the upper surface test sample 204, but will not affect the lower surface of the upper surface test sample 204.

[0086] Step B2: Move the second magnet so that the lower surface of the lower surface test sample is lower than the liquid level of the pickling liquid and the upper surface of the lower surface test sample is higher than the liquid level of the pickling liquid.

[0087] In a specific implementation, the operation on the second magnet is similar to that on the first magnet, and will not be described in detail here.

[0088] In the above embodiment of the present application, when moving the above first magnet, the upper surface position of the upper surface test sample is lower than the liquid level of the pickling liquid and the lower surface position of the above upper surface test sample is higher than the liquid level of the pickling liquid. When moving the above second magnet, the lower surface position of the lower surface test sample is lower than the liquid level of the pickling liquid and the upper surface position of the above lower surface test sample is higher than the liquid level of the pickling liquid. In this way, the surface of the test sample that needs to be pickled can be immersed in the pickling liquid, while the surface that does not need to be pickled is outside the pickling liquid, thereby minimizing the contact between the pickling liquid and the surface that does not need to be pickled.

[0089] In order to improve the accuracy of the steel pickling property detection, in some embodiments, before the above S102, the above method may further include steps A3 to B3:

[0090] Step A3: immerse the upper surface test sample and the lower surface test sample in a container filled with an organic detergent and use an ultrasonic instrument to ultrasonically clean the test samples.

[0091] In a specific implementation, an organic solvent tank is prepared in advance, which is large enough to accommodate the sample and contains an organic solvent, such as alcohol, etc. The upper surface test sample and the lower surface test sample are placed in the organic solvent tank respectively, ensuring that they are completely covered by the organic solvent.

[0092] As another example, after placing the upper surface test sample and the lower surface test sample into the organic solvent tank, the samples may be gently shaken to ensure that the organic solvent completely covers and fills all gaps on the sample surface to prevent air bubbles from affecting the cleaning effect.

[0093] Step B3: emitting ultrasonic waves to the organic solvent through an ultrasonic generator.

[0094] In a specific implementation, the ultrasonic generator is started to emit ultrasonic waves to the organic solvent, and the ultrasonic treatment is continued for a certain period of time to ensure that the organic solvent and the ultrasonic waves can jointly clean and treat the sample surface.

[0095] In the above embodiment of the present application, the upper surface test sample and the lower surface test sample are immersed in an organic solvent, and then an ultrasonic wave is emitted to the organic solvent by an ultrasonic wave generator. The test sample is cleaned to remove dirt and impurities on the surface, thereby ensuring that the acid-resistant coating is completely and reliably covered, thereby improving the accuracy of the steel pickling property test.

[0096] In order to prevent moisture in the acid-resistant coating from interfering with the experimental results, in some embodiments, the above S102 may include steps A4 to B4:

[0097] Step A4: Use an acid-resistant coating to cover the lower surface and side surfaces of the upper surface test sample and the upper surface and side surfaces of the lower surface test sample.

[0098] In a specific implementation, the upper surface test sample and the lower surface test sample are placed on a suitable workbench or stand, and then the acid-resistant coating is evenly applied to the lower surface and side of the sample using a brush, roller or spray gun. The coated sample is placed in a well-ventilated area to allow the acid-resistant coating to dry naturally. Alternatively, the sample is dried to ensure that the coating is completely dry and forms a solid protective layer.

[0099] Step B4: When the acid-resistant coating is dry, weigh the upper surface test sample and the lower surface test sample to obtain a first initial mass corresponding to the upper surface test sample and a second initial mass corresponding to the lower surface test sample.

[0100] In a specific implementation, when the acid-resistant coating is dry, a precision weighing device, such as an electronic balance, is used to place the upper surface test sample and the lower surface test sample coated with the acid-resistant coating and dried on a weighing table, respectively, and the corresponding first initial mass and second initial mass are recorded.

[0101] In the above embodiment of the present application, the upper surface test sample and the lower surface test sample are weighed only when the acid-resistant coating is dry, and the first initial mass corresponding to the upper surface test sample and the second initial mass corresponding to the lower surface test sample are obtained, so as to avoid the moisture in the acid-resistant coating from interfering with the experimental results.

[0102] In order to more accurately evaluate the pickling property of the target steel, in some embodiments, after S103, the method may further include:

[0103] The complete pickling time of the upper surface test sample and the lower surface test sample was determined.

[0104] In a specific implementation, the pickled upper surface test sample and the lower surface test sample can be placed under a microscope for observation. Specifically, a metallographic microscope or other suitable microscope can be used to select a suitable magnification to observe the oxide layer on the surface of the sample. The thickness, color, structure and other characteristics of the oxide layer can be observed. As another example, during the observation process, a photo of the sample surface can be taken to record the state and characteristics of the oxide layer. Image processing and measurement can also be performed to obtain more detailed oxide layer information. The complete pickling time of the test sample is then determined based on the observation results.

[0105] The above S106 includes steps A5 to C5:

[0106] A5: obtaining a first pickling loss rate based on the ratio of the first mass loss value to the surface area of ​​the upper surface test sample;

[0107] B5: obtaining a second pickling loss rate based on the ratio of the second mass loss value to the surface area of ​​the lower surface test sample;

[0108] Step D5: Determine the pickling property of the target steel material based on the first pickling loss rate and the product of the second pickling loss rate and the complete pickling time.

[0109] In a specific implementation, the product of the two calculated pickling rates and the complete pickling time is used to obtain the pickling property of the target steel.

[0110] The above embodiment of the present application detects the oxide layer state of the above upper surface test sample and the above lower surface test sample through a microscope, and determines the oxide layer removal efficiency through the above oxide layer state, and determines the pickling property of the target steel material based on the above first pickling rate and the product of the above second pickling rate and the above oxide layer removal efficiency. By actually observing the oxide layer state of the sample, the pickling property of the target steel material can be evaluated more accurately.

[0111] In order to determine a suitable steel pickling solution, in some embodiments, after the above step D5, the above method may further include:

[0112] When the product of the first pickling loss rate and the complete pickling time is within a first preset range, and the product of the second pickling loss rate and the complete pickling time is within a second preset range, the preset pickling test parameters are determined as the steel pickling scheme parameters corresponding to the target steel.

[0113] In a specific implementation, the preset range of the product of the first pickling loss rate and the complete pickling time is determined according to the characteristics of the steel and the expected pickling effect. This range can be a specific interval. Similarly, according to the characteristics of the steel and the expected pickling effect, the product of the second pickling loss rate and the complete pickling time is determined. After the pickling process is completed, the relationship between it and the preset range is compared to determine whether they are all within the preset range. If they are all within the preset range, the pickling test parameters used are determined as the steel pickling scheme parameters corresponding to the target steel.

[0114] In the above embodiment of the present application, when the product of the first pickling loss rate and the complete pickling time is within a first preset range and the product of the second pickling loss rate and the complete pickling time is within a second preset range, the preset pickling test parameters are determined as steel pickling scheme parameters corresponding to the target steel. A suitable steel pickling scheme can be determined based on the results of the steel pickling test.

[0115] In order to avoid residual pickling liquid interfering with the results, in some embodiments, after the above S103, the above method may further include steps A6 to B6:

[0116] Step A6: Wash the upper surface test sample and the lower surface test sample with water.

[0117] In a specific implementation, the upper surface test sample and the lower surface test sample are placed in water respectively to ensure that they are completely immersed. The samples are stirred to ensure that the residual acid or other contaminants on the surface are fully rinsed off. The washed samples are taken out and can be rinsed again with distilled water to ensure that the residual water stains or dirt are removed.

[0118] Step B6: Blow cold air towards the washed upper surface test sample and the washed lower surface test sample to dry the washed upper surface test sample and the washed lower surface test sample.

[0119] In a specific implementation, an air gun or a dryer is used to blow a clean air flow to the sample surface to ensure that moisture is quickly removed from the surface.

[0120] In the above embodiment of the present application, the upper surface test sample and the lower surface test sample are washed with water, and then cold air is blown to the washed upper surface test sample and the lower surface test sample to dry them, so as to avoid the residual pickling liquid from interfering with the results.

[0121] In one embodiment of the present application, after obtaining the target hot-rolled steel, that is, the target steel material, wire cutting is used, and typical position lines are selected for cutting to obtain samples, and then the samples are cleaned using ultrasound and alcohol. Place the samples on a flat plate according to the label, and paper or film can be laid under the samples. Use paint spray to cover one surface and side of the sample, and after the paint is naturally dried, the samples are numbered and weighed. Then, a strong hangable magnet is used to suck the sprayed paint surface of the sample. In order to prevent the magnet from acid corrosion, the magnet can be sprayed with paint. According to the trial pickling scheme, the hydrochloric acid concentration is configured, the pickling temperature and the pickling time are set for pickling, and the pickling liquid container is placed on a vibrator with adjustable frequency to simulate pickling turbulence. After the pickling is completed, take out the sample, wash it with water and blow it dry, and weigh the sample. Then calculate the mass loss per unit area, that is, the pickling rate, which can be referred to Figure 4 At the same time, the pickling properties of the hot-rolled strip can be comprehensively analyzed by optical microscope or electron microscope detection and analysis.

[0122] The present application also provides a hot-rolled steel pickle-washability detection system, which comprises a pickling device and a controller. The pickling device is used to pickle the test sample, and the controller is used to control the system. When the steel pickle-washability detection system is in operation, the steel pickle-washability detection method described above is implemented.

[0123] It should be clear that the present application is not limited to the specific configuration and processing described above and shown in the figures. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present application is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present application.

[0124] It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, this application is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiment, or in a different order from the embodiment, or several steps can be performed simultaneously.

[0125] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of this application.

Claims

1. A method for detecting the pickling property of hot-rolled steel, characterized in that: include: The target hot-rolled steel sample is divided into an upper surface test sample and a lower surface test sample, wherein the upper surface and the lower surface are two hot-rolled surfaces of the hot-rolled steel sample; Covering the lower surface and side surfaces of the upper surface test sample and the upper surface and side surfaces of the lower surface test sample with an acid-resistant coating, and weighing them to obtain a first initial mass corresponding to the upper surface test sample and a second initial mass corresponding to the lower surface test sample; Pickling the upper surface test sample and the lower surface test sample according to preset pickling test parameters, wherein the preset pickling test parameters include pickling time; Calculate the difference between the first initial mass and the mass of the upper surface test sample after pickling to obtain a first mass loss value; Calculate the difference between the second initial mass and the mass of the lower surface test sample after pickling to obtain a second mass loss value; The pickling property of the target steel material is determined based on the ratio of the first mass loss value to the surface area of ​​the upper surface test sample and the ratio of the second mass loss value to the surface area of ​​the lower surface test sample.

2. The method for detecting the pickling property of steel according to claim 1, characterized in that: The pickling of the upper surface test sample and the lower surface test sample according to preset pickling test parameters includes: Using a first magnet to adsorb the lower surface of the upper surface test sample; Using a second magnet to adsorb the upper surface of the lower surface test sample; Moving the first magnet and the second magnet so that the upper surface test sample and the lower surface test sample are immersed in the pickling liquid; According to preset pickling test parameters, the upper surface test sample and the lower surface test sample are pickled by the pickling liquid.

3. The method for detecting the pickling property of steel according to claim 2, characterized in that: After moving the first magnet and the second magnet so that the upper surface test sample and the lower surface test sample are immersed in the pickling liquid, the method further includes: The pickling liquid is vibrated at a preset frequency by means of a vibration instrument.

4. The method for detecting the pickling property of steel according to claim 1, characterized in that: Before covering the lower surface and side surfaces of the upper surface test sample and the upper surface and side surfaces of the lower surface test sample with the acid-resistant coating and weighing them to obtain a first initial mass corresponding to the upper surface test sample and a second initial mass corresponding to the lower surface test sample, the method further includes: The upper surface test sample and the lower surface test sample are immersed in a container filled with an organic cleaning agent and ultrasonically cleaned using an ultrasonic instrument.

5. The method for detecting the pickling property of steel according to claim 1, characterized in that: The step of covering the lower surface and side surfaces of the upper surface test sample and the upper surface and side surfaces of the lower surface test sample with an acid-resistant coating and weighing them to obtain a first initial mass corresponding to the upper surface test sample and a second initial mass corresponding to the lower surface test sample comprises: Covering the lower surface and side surfaces of the upper surface test sample and the upper surface and side surfaces of the lower surface test sample with an acid-resistant coating; When the acid-resistant coating is dry, the upper surface test sample and the lower surface test sample are weighed to obtain a first initial mass corresponding to the upper surface test sample and a second initial mass corresponding to the lower surface test sample.

6. The method for detecting pickling property of steel according to claim 1, characterized in that: After pickling the upper surface test sample and the lower surface test sample according to the preset pickling test parameters, the method further includes: Determining the complete pickling time of the upper surface test sample and the lower surface test sample; The step of determining the pickling property of the target steel material based on the ratio of the first mass loss value to the surface area of ​​the upper surface test sample and the ratio of the second mass loss value to the surface area of ​​the lower surface test sample comprises: Obtaining a first pickling loss rate based on a ratio of the first mass loss value to the surface area of ​​the upper surface test sample; Obtaining a second pickling loss rate based on a ratio of the second mass loss value to the surface area of ​​the lower surface test sample; The pickling property of the target steel material is determined based on the product of the first pickling loss rate and the second pickling loss rate and the complete pickling time.

7. The method for detecting the pickling property of steel according to claim 6, characterized in that: After determining the pickling property of the target steel material based on the first pickling loss rate and the product of the second pickling loss rate and the complete pickling time, the method further includes: When the product of the first pickling loss rate and the complete pickling time is within a first preset range, and the product of the second pickling loss rate and the complete pickling time is within a second preset range, the preset pickling test parameters are determined as the steel pickling scheme parameters corresponding to the target steel.

8. The method for detecting the pickling property of steel according to any one of claims 1 to 7, characterized in that: After pickling the upper surface test sample and the lower surface test sample according to the preset pickling test parameters, the method further includes: Washing the upper surface test sample and the lower surface test sample with water; Cold air is blown toward the washed upper surface test sample and the washed lower surface test sample to dry the washed upper surface test sample and the washed lower surface test sample.

9. A hot-rolled steel pickling property detection system, characterized in that: The steel pickleability detection system comprises a pickling device and a controller, wherein the pickling device is used to pickle the test sample, and the controller is used to control the system. When the steel pickleability detection system is in operation, the steel pickleability detection method according to any one of claims 1 to 8 is implemented.

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