Steel pickling property detection method and system

Abstract

The present application provides a method and system for detecting the pickling property of hot-rolled steel. The method includes: dividing a target hot-rolled steel sample into an upper surface test sample and a lower surface test 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, the preset pickling test parameters including the pickling time; calculating 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; determining the pickling property of the target steel 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.

Description

Technical Field

[0001] The present application relates to the field of metal detection technology, 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 coiled, it is then slowly cooled. During this process, the strip's surface oxidizes, forming a layer of iron oxide scale. Generally, pickling is required to remove this surface oxide scale and maintain the surface quality of the produced strip. However, the formation of iron oxide scale depends on many factors, and pickling simulation tests are often required to determine the specific pickling process and ensure pickling quality.

[0003] However, due to the differences in contact and non-contact between the upper and lower surfaces of the steel strip and the rails during hot rolling, and the differences in the residence time of the cold water on the upper and lower surfaces, differences in the structure and thickness of the iron oxide scale on the upper and lower surfaces will occur. Therefore, during the pickling simulation test, one surface and side of the steel strip are often sealed to analyze the differences in pickling on the upper and lower surfaces separately. Existing sealing technologies, such as the use of acid-insoluble silicone 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 may easily flow in and cover the part that needs to be sealed, causing errors in the results of the pickling simulation test and inaccurate results on the pickling ability of the steel. Summary of the Invention

[0004] The embodiments of the present application provide a method and system for detecting the pickling ability of hot-rolled steel, which can improve the accuracy of the pickling ability 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, where 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] Calculating 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 using the pickling liquid.

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

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

[0019] In some possible implementations, 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 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;

[0021] The second magnet is moved 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.

[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 ultrasonically cleaning the test samples using an ultrasonic instrument;

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

[0025] In some possible implementations, 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, includes:

[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 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 ability 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 ability 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] Blow cold air 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, which includes 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, it implements the steel pickle washability detection method described above.

[0040] The steel pickling property detection method provided in the embodiment of the present application uses 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. Pickling is then 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 pickling property of the target steel. By using acid-resistant coating, the surface of the test sample that does not require pickling test can be completely covered, and the acid-resistant coating 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 pickling property result can be accurately obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The present application can be better understood from the following description of 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 from 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 This is a flow chart of a method for detecting the pickling property 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 a 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 merely 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 document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, the elements defined by the phrase "comprising..." do not exclude the presence of other identical elements in the process, method, article, or device comprising the elements.

[0049] During the strip manufacturing process, hot-rolled strip is rolled, coiled, and then slowly cooled. During this process, the strip surface is oxidized to form a layer of iron oxide scale. The composition and structure of the iron oxide scale on the strip surface vary depending on the chemical composition of the steel, the strip surface temperature during rolling, the heating temperature, the final rolling temperature, the cooling schedule, and the oxygen content of the surrounding medium. The pickling ability of hot-rolled strip, like the formation of iron oxide scale, is affected by many factors, such as the adhesion strength of the iron oxide scale, the composition of the steel, the type and degree of mechanical deformation, the structure and thickness of the iron oxide scale, surface contamination (such as oil and grease), surface defects, the type and composition of the pickling agent, and the working conditions during pickling. Therefore, studying the pickling ability of iron oxide scale requires not only analyzing the structure and thickness of the iron oxide scale itself, but also conducting relevant pickling simulation tests to study the pickling properties of the iron oxide scale. This allows for the continuous optimization of the hot rolling schedule and pickling process to achieve cost savings, increase the pickling speed, and increase pickling capacity while ensuring pickling quality.

[0050] However, due to the differences in contact and non-contact between the upper and lower surfaces of the strip and the rails during hot rolling, and the differences in the residence time of the cold water on the upper and lower surfaces, there will be differences in the structure and thickness of the iron oxide scale on the upper and lower surfaces, 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 sample is not flat enough using these methods, the bottom liquid will be poured in and cover part of the bottom, affecting the calculated surface area. In addition, the sample size is limited during pickling using 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 acid-resistant coating is used to seal the samples during the pickling test, it can solve 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.

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

[0053] Figure 1 FIG1 shows 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 a target hot-rolled steel sample. The steel's production process may result in surface differences, and these surface differences are used to distinguish the upper and lower surfaces of the steel. For example, due to differences in contact and non-contact between the upper and lower surfaces of the steel during hot rolling, as well as differences in the residence time of the cold water on the upper and lower surfaces, the structure and thickness of the oxide scale on the upper and lower surfaces may differ. Therefore, the target hot-rolled steel sample can be divided into upper surface test samples and lower surface test samples, that is, samples tested on the upper surface of the steel and samples tested on the lower surface of the steel.

[0056] As another example, the cut samples can 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 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 applied to 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, leaving the upper surface of the upper surface test sample uncovered and the lower surface of the lower surface test sample uncovered. Ensure that the coating is applied evenly and tightly, and that there are no missing or over-coated areas. The coated samples are weighed, and a first initial mass corresponding to the upper surface test sample and a second initial mass corresponding to the lower surface test sample are recorded.

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

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

[0068] The steel pickling property detection method provided by the above-mentioned 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 carried out 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 pickling property 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 gap to cause the result of the pickling test to have an error, and the steel pickling property result can be accurately obtained.

[0069] In order to facilitate sample fixation during acid washing, 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, a first magnet is placed on the lower surface of the upper surface test sample, ensuring that the magnet firmly adheres to the sample. Specifically, the first magnet adheres to the side of the upper surface test sample coated with the acid-resistant coating. This prevents the first magnet from adsorbing the surface requiring pickling, which could affect the reaction between the sample and the pickling liquid and cause errors in the results. The process of using a second magnet to adhere to 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. Thus, the electromagnets can attract the test sample when energized and can drop the test sample when deenergized, making it more convenient to move the test sample.

[0074] Step C1: moving the first magnet and the second magnet to immerse the upper surface test sample and the lower surface test sample in the 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 will understand that the steps for using the second magnet are similar to those for the first magnet, and therefore will not be described in detail 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 using the pickling liquid.

[0077] In a specific implementation, the upper and lower surface test samples are moved from their previous locations into the pickling tank. Ensure that the samples are completely immersed in the pickling liquid and that the liquid covers the entire sample surface. According to the preset pickling test parameters, the pickling process conditions, including the pickling liquid temperature and immersion time, are controlled. A 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. This completes the pickling process.

[0078] In the above embodiment of the present application, a first magnet is used to attract the lower surface of the upper surface test sample, a second magnet is used to attract the upper surface of the lower surface test sample, and then the magnets are moved to immerse the upper and lower surface test samples in a pickling liquid for pickling. Using magnets for adsorption and fixation makes it easier to fix the sample during pickling.

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

[0080] The pickling liquid is vibrated according to a preset frequency by a vibration instrument.

[0081] In a specific implementation, a vibration instrument for vibrating the liquid is prepared in advance. The pickling tank containing the upper and lower surface test samples is placed on the vibration instrument, ensuring that the pickling tank is securely mounted on the vibration platform and the samples are completely immersed in the pickling liquid. The vibration frequency of the vibration instrument is set according to the preset frequency requirements. After the vibration parameters are set, the vibration instrument is started and it begins to vibrate the pickling liquid at the preset frequency.

[0082] The above 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 to be pickled, 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 so that the liquid level of the pickling liquid 202 is 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 without affecting 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 first magnet, the upper surface of the upper surface test sample is positioned below the liquid level of the pickling liquid, and the lower surface of the upper surface test sample is positioned above the liquid level of the pickling liquid. When moving the second magnet, the lower surface of the lower surface test sample is positioned below the liquid level of the pickling liquid, and the upper surface of the lower surface test sample is positioned above the liquid level of the pickling liquid. This allows the surface of the test sample that requires pickling to be immersed in the pickling liquid, while the surface that does not require pickling is outside the pickling liquid, thereby minimizing contact between the pickling liquid and the surface that does not require pickling.

[0089] In order to improve the accuracy of the steel pickling property test, 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 large enough to accommodate the sample is prepared in advance, which is filled with 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, an ultrasonic generator is activated to emit ultrasonic waves toward 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 jointly clean and treat the sample surface.

[0095] In the above-described embodiment of the present application, the upper surface test sample and the lower surface test sample are immersed in an organic solvent, and then ultrasonic waves are emitted into the organic solvent by an ultrasonic generator. This cleans the test samples, removes surface dirt and impurities, ensures complete and reliable coverage of the acid-resistant coating, and thereby improves the accuracy of the steel pickling 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: 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.

[0098] In practice, place the upper and lower surface test samples on a suitable workbench or stand. Then, use a brush, roller, or spray gun to evenly apply the acid-resistant coating to the lower and side surfaces of the samples. Place the coated samples in a well-ventilated area and allow the acid-resistant coating to dry naturally. Alternatively, place them in a drying oven 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 above-mentioned acid-resistant coating is dry, a precision weighing device, such as an electronic balance, is used to place the above-mentioned upper surface test sample and the above-mentioned lower surface test sample coated with the acid-resistant coating and dried on a weighing table respectively, and record the corresponding first initial mass and second initial mass.

[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, thereby obtaining a first initial mass corresponding to the upper surface test sample and a second initial mass corresponding to the lower surface test sample. This can prevent 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 and lower surface test samples can be placed under a microscope for observation. Specifically, a metallographic microscope or other suitable microscope can be used, with an appropriate magnification, to observe the oxide layer on the sample surface. Characteristics such as the thickness, color, and structure of the oxide layer can be observed. As another example, during the observation process, a photograph 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 information about the oxide layer. The complete pickling time of the test sample can then be 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 a 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 a ratio of the second mass loss value to the surface area of ​​the lower surface test sample;

[0108] Step D5: Determine the pickling ability 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] In the above embodiment of the present application, the oxide layer state of the upper surface test sample and the lower surface test sample is examined microscopically. The oxide layer removal efficiency is determined based on the oxide layer state. The pickling ability of the target steel is determined based on the first pickling rate and the product of the second pickling rate and the oxide layer removal efficiency. By actually observing the oxide layer state of the sample, the pickling ability of the target steel can be more accurately evaluated.

[0111] In order to determine a suitable steel pickling solution, in some embodiments, after step D5, the 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, a preset range for the product of the first pickling loss rate and the complete pickling time is determined based on the steel's characteristics and the expected pickling results. This range can be a specific interval. Similarly, a second pickling loss rate and the product of the complete pickling time are determined based on the steel's characteristics and the expected pickling results. After the pickling process is completed, the product is compared with the preset range to determine whether both are within the preset range. If both are within the preset range, the pickling test parameters used are determined as the steel pickling plan 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 the 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 prevent residual pickling liquid from interfering with the results, in some embodiments, after S103, the 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 practice, place the upper and lower surface test samples in water, ensuring they are completely immersed. Stir the samples to ensure that any residual acid or other contaminants on the surface are fully rinsed. Remove the rinsed samples and rinse them again with distilled water to ensure that any remaining water stains or dirt are removed.

[0118] Step B6: Blow cold air 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.

[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, thereby preventing 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 a typical position line is selected for cutting to obtain a sample, and then the sample is cleaned using ultrasound and alcohol. The sample is placed on a flat plate according to the label, and paper or film can be laid under the sample. Use paint spray to cover one surface and side of the sample, and after the paint is naturally dried, the sample is numbered and weighed. Then a strong magnet that can be hung is used to attract 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, the sample is taken out for water washing and blown dry, and the sample is weighed. Then calculate the mass loss per unit area, that is, the pickling rate, which can be referred to Figure 4 At the same time, optical microscope or electron microscope detection and analysis are used to comprehensively analyze the pickling properties of hot-rolled strip.

[0122] The present application also provides a hot-rolled steel pickle washability detection system, which includes 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 understood that the present application is not limited to the specific configurations and processes described above and illustrated in the figures. For the sake of brevity, a detailed description of known methods is omitted here. In the above embodiments, several specific steps are described and illustrated as examples. However, the method process of the present application is not limited to the specific steps described and illustrated. Those skilled in the art can make various changes, modifications, and additions, or change the order of 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. In other words, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

[0125] The above description is only a specific embodiment of the present application. Those skilled in the art will clearly understand that for the convenience and brevity 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 scope of protection of the present application is not limited thereto. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the scope of protection of the present 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, where 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; Calculating 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, wherein: 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 using the pickling liquid.

3. The method for detecting the pickling property of steel according to claim 2, wherein: 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 a vibration instrument.

4. The method for detecting the pickling property of steel according to claim 1, wherein: 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 containing an organic detergent and ultrasonically cleaned using an ultrasonic instrument.

5. The method for detecting the pickling property of steel according to claim 1, wherein: 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 the samples 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 the pickling property of steel according to claim 1, wherein: 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 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 ability 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, wherein: After determining the pickling ability 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; Blow cold air 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 includes 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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