A method and device for on-line detecting the hardness of nickel-saving austenitic stainless steel strip

Abstract

The present invention discloses a method and a device for on-line detecting the hardness of nickel-saving austenitic stainless steel strip, which specifically include the following steps: Sample data acquisition: Using a ferrite measuring device to collect the ferrite value of the nickel-saving austenitic stainless steel strip test sample; the nickel-saving austenitic stainless steel strip test sample is obtained after the nickel-saving austenitic stainless steel strip goes through steelmaking, hot rolling and then enters the continuous annealing and pickling production line for operation; Processing of the sample data to obtain the hardness of the nickel-saving austenitic stainless steel strip: Inputting the ferrite value into a processor, and the processor calculates to obtain the hardness of the nickel-saving austenitic stainless steel strip; The method of the present invention directly detects on the surface of the nickel-saving austenitic stainless steel strip without cutting the sample and without damaging the nickel-saving austenitic stainless steel strip, quickly feeds back the hardness value of the product, and continuously detects the hardness of the nickel-saving austenitic stainless steel strip.

Description

Technical Field

[0001] The present invention relates to the field of hardness detection of stainless steel strip steel, and specifically to a method and device for on-line detection of the hardness of nickel-saving austenitic stainless steel strip steel. Background Art

[0002] In order to meet the needs of cold rolling and downstream processing, the hardness of nickel-saving austenitic stainless steel strip steel must be controlled by annealing.

[0003] Generally, the hardness of nickel-saving austenitic stainless steel strip steel is detected by a hardness tester. After the annealing and pickling of nickel-saving austenitic stainless steel strip steel are completed, samples need to be taken, and then the collected sample pieces are sent to a laboratory. After receiving the test specimens, the laboratory uses a hardness tester to detect the test specimens, and finally reads the test results.

[0004] However, such detection has many inconveniences: 1. The entire detection process is relatively long, which is not conducive to quickly feedbacking the hardness value of the product; 2. It cannot feedback the fluctuation of the hardness of nickel-saving austenitic stainless steel strip steel (since during the annealing of the strip steel, both the furnace temperature of the annealing furnace and the running speed of nickel-saving austenitic stainless steel strip steel fluctuate, so the hardness value of the strip steel will also fluctuate). Due to the need to ensure the continuity of the hardness value of nickel-saving austenitic stainless steel strip steel, only the samples can be cut and detected at the head and tail, and the hardness of the entire coil of nickel-saving austenitic stainless steel strip steel cannot be accurately feedbacked; unless the samples are cut and detected in multiple segments, but such detection is not only troublesome but also seriously affects the single weight of the coil. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a method for on-line detection of the hardness of nickel-saving austenitic stainless steel strip steel, which directly detects on the surface of nickel-saving austenitic stainless steel strip steel without cutting or damaging the nickel-saving austenitic stainless steel strip steel, quickly feedbacks the hardness value of the product, and continuously detects the hardness of nickel-saving austenitic stainless steel strip steel.

[0006] The present invention also proposes a ferrite measuring device applied to the above method.

[0007] To achieve the above object, the present invention provides the following technical solution: A method for on-line detection of the hardness of nickel-saving austenitic stainless steel strip steel, which specifically includes the following steps:

[0008] Sampling data collection: Using a ferrite measuring device to collect the ferrite values of the test samples of nickel-saving austenitic stainless steel strip steel; the test samples of nickel-saving austenitic stainless steel strip steel are obtained after the nickel-saving austenitic stainless steel strip steel undergoes steelmaking, hot rolling and then enters the continuous annealing and pickling production line for operation;

[0009] Processing of the sample data to obtain the hardness of the nickel-saving austenitic stainless steel strip: input the ferrite value into a processor, and the processor calculates to obtain the hardness of the nickel-saving austenitic stainless steel strip; the calculation method is based on the following formula:

[0010] HRB = (20.784 + F^ -0.719667 ) / 0.22928;

[0011] In the formula, HRB is the Rockwell hardness value of the nickel-saving austenitic stainless steel strip, and F is the ferrite value measured by the ferrite measuring device.

[0012] Furthermore, the ferrite measuring device collects the ferrite values of the nickel-saving austenitic stainless steel strip test sample 10 to 20 times per minute.

[0013] Furthermore, the surface of the nickel-saving austenitic stainless steel strip test sample for sample data collection is divided into multiple detection areas. The ferrite measuring device measures the ferrite values multiple times in the same detection area, calculates the average ferrite value of this detection area based on these ferrite values, and then inputs the average ferrite value into the processor to calculate the hardness of the nickel-saving austenitic stainless steel strip.

[0014] In the same area, measure multiple times and take the average value to ensure the reliability of the measured ferrite value and reduce the detection error.

[0015] Furthermore, the nickel-saving austenitic stainless steel strip test sample is placed on a conveying device, and the conveying device drives the nickel-saving austenitic stainless steel strip test sample to advance 1 to 2 meters per minute.

[0016] Furthermore, the temperature range of the nickel-saving austenitic stainless steel strip test sample is 20°C to 40°C.

[0017] Avoid damage to the ferrite measuring device caused by the high temperature of the nickel-saving austenitic stainless steel strip test sample.

[0018] Furthermore, before the ferrite measuring device is detected, the ferrite measuring device is calibrated first using a ferrite measuring device standard piece.

[0019] Avoid errors in the measurement results caused by the uncalibrated ferrite measuring device.

[0020] A ferrite detection device applied to the above method. The device includes a sample data acquisition unit and a sample data processing unit. The data acquisition unit includes a ferrite detection probe, a manipulator, and a controller. The sample data processing unit includes a processor, a memory, and a display. The ferrite detection probe is installed at the end of the manipulator. The output end of the controller is connected to the input end of the manipulator. The output end of the ferrite detection probe is respectively connected to the input ends of the processor, the memory, and the display. The output end of the processor is respectively connected to the input ends of the memory and the display.

[0021] A ferrite detection probe is installed at the end of the manipulator, replacing manual handling of the detection probe to measure the ferrite value, avoiding potential hazards to personnel, and reducing the work fatigue caused by mechanical detection movements to personnel. The controller controls the manipulator through PLC to perform detection movements. The processor is used to process the data detected by the ferrite detection probe, substitute it into the calculation formula, and obtain the HRB Rockwell hardness value of the nickel-saving austenitic stainless steel strip. The memory is used to record and store the measured ferrite value and the HRB Rockwell hardness value of the nickel-saving austenitic stainless steel strip. The display screen can display the ferrite value and the HRB Rockwell hardness value of the nickel-saving austenitic stainless steel strip.

[0022] Compared with the prior art, the technical solution of the present application has the following beneficial effects:

[0023] 1. The present invention provides a method for on-line detecting the hardness of nickel-saving austenitic stainless steel strips. Without cutting the sample and without damaging the nickel-saving austenitic stainless steel strip, it directly detects on the surface of the nickel-saving austenitic stainless steel strip, quickly feedbacks the hardness value of the product, and continuously detects the hardness of the nickel-saving austenitic stainless steel strip.

[0024] 2. The present invention is provided with a manipulator and a controller in the ferrite measuring device, replacing manual handling of the detection probe to measure the ferrite value, avoiding potential hazards to personnel, and reducing the work fatigue caused by mechanical detection movements to personnel. The manipulator can be remotely controlled to perform detection movements.

[0025] 3. Before the ferrite measuring device of the present invention performs detection, it first calibrates the ferrite measuring device with a standard piece of the ferrite measuring device to avoid errors in the measurement results. Description of the Drawings

[0026] Figure 1 It is a schematic flow chart of the steps of the method in the present invention;

[0027] Figure 2 It is a schematic signal transmission flow chart of the ferrite measuring device applied to the method of the present invention;

[0028] Figure 3Schematic diagram for comparing the HRB values calculated in Example 1 with the HRB values tested by a laboratory hardness tester;

[0029] Figure 4 Schematic diagram for comparing the HRB values calculated in Example 2 with the HRB values tested by a laboratory hardness tester;

[0030] Figure 5 Schematic diagram for comparing the HRB values calculated in Example 3 with the HRB values tested by a laboratory hardness tester;

[0031] Figure 6 Schematic diagram for comparing the HRB values calculated in Example 4 with the HRB values tested by a laboratory hardness tester;

[0032] Figure 7 Schematic diagram for detecting the hardness fluctuation of a nickel - saving austenitic stainless steel strip in the examples. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] Please refer to Figure 1 , a method for on - line detecting the hardness of a nickel - saving austenitic stainless steel strip in this embodiment specifically includes the following steps:

[0035] Sampling data collection: Use a ferrite measuring device to collect the ferrite values of the nickel - saving austenitic stainless steel strip test samples; the nickel - saving austenitic stainless steel strip test samples are obtained after the nickel - saving austenitic stainless steel strip undergoes steelmaking, hot rolling and then enters the continuous annealing and pickling production line for operation;

[0036] Processing of the sampling data to obtain the hardness of the nickel - saving austenitic stainless steel strip: Input the ferrite values into a processor, and the processor calculates to obtain the hardness of the nickel - saving austenitic stainless steel strip; the calculation method is based on the following formula:

[0037] HRB=(20.784 + F^ -0.719667 ) / 0.22928;

[0038] In the formula, HRB is the Rockwell hardness value of the nickel - saving austenitic stainless steel strip, and F is the ferrite value measured by the ferrite measuring device.

[0039] In the present invention, the main components of the nickel-saving austenitic stainless steel are 0.12% - 0.15% C, 0.3% - 0.5% Si, 8.2% - 8.7% Mn, 14% - 15% Cr, 1.0% - 1.3% Ni, 0.1% - 0.2% N, 20 - 50 ppm rare earth, and the balance is Fe.

[0040] In the present invention, the ferrite measuring device collects the ferrite values of the nickel-saving austenitic stainless steel strip test pieces 10 to 20 times per minute.

[0041] In the present invention, the surface of the nickel-saving austenitic stainless steel strip test piece for sample data collection is divided into multiple detection areas. The ferrite measuring device measures the ferrite values multiple times in the same detection area, and based on these ferrite values, calculates the average ferrite value of this detection area. Then, the average ferrite value is input into the processor to calculate the hardness of the nickel-saving austenitic stainless steel strip, ensuring the reliability of the measured ferrite values and reducing the detection error.

[0042] In the present invention, the nickel-saving austenitic stainless steel strip test piece is placed on the conveying device, and the conveying device drives the nickel-saving austenitic stainless steel strip test piece to advance 1 to 2 meters per minute.

[0043] In the present invention, the temperature range of the nickel-saving austenitic stainless steel strip test piece is 20°C to 40°C, to avoid damage to the ferrite measuring device caused by the high temperature of the nickel-saving austenitic stainless steel strip test piece.

[0044] In the present invention, before the ferrite measuring device is detected, the ferrite measuring device is calibrated first using the ferrite measuring device standard piece, to avoid errors in the measurement results caused by the uncalibrated ferrite measuring device.

[0045] In addition, the present invention also discloses a ferrite detection device applied to the method of the present invention. The device includes a sample data acquisition unit and a sample data processing unit. The data acquisition unit includes a ferrite detection probe, a manipulator, and a controller. The sample data processing unit includes a processor, a memory, and a display. The ferrite detection probe is installed at the end of the manipulator. The output end of the controller is connected to the input end of the manipulator. The output end of the ferrite detection probe is respectively connected to the input end of the processor, the input end of the memory, and the input end of the display. The output end of the processor is respectively connected to the input end of the memory and the input end of the display. A ferrite detection probe is installed at the end of the manipulator, replacing manual detection of the ferrite value with the probe, avoiding potential personnel injuries, and reducing the work fatigue caused by mechanical detection movements to personnel. The controller controls the manipulator through a PLC to perform detection movements. The processor is used to process the data detected by the ferrite detection probe, substitute it into the calculation formula, and obtain the HRB Rockwell hardness value of the nickel-saving austenitic stainless steel strip. The memory is used to record and store the measured ferrite value and the HRB Rockwell hardness value of the nickel-saving austenitic stainless steel strip. The display screen can display the ferrite value and the HRB Rockwell hardness value of the nickel-saving austenitic stainless steel strip.

[0046] Example 1

[0047] The stainless steel strip meets the composition requirements of nickel-saving austenitic stainless steel and operates on a continuous annealing and pickling production line. The manipulator of the ferrite measurement device automatically selects an area from the outlet of the annealing water cooling section to the inlet of pickling, and contacts the calibrated probe with the same area on the strip surface 20 times. The average value of the measured ferrite values is selected as 0.3, and the value is substituted into the formula HRB = (20.784 + F^ -0.719667 ) / 0.22928 to calculate the hardness of 101.0 HRB.

[0048] Please refer to Figure 2 , the measurement position samples at the production line outlet and sends it to the laboratory for hardness detection using a hardness tester, and the hardness is 101.0 HRB. The measurement and calculation results according to the method of the present invention are consistent with the laboratory standard detection results.

[0049] Example 2

[0050] The stainless steel strip meets the composition requirements of nickel-saving austenitic stainless steel and operates on a continuous annealing and pickling production line. The manipulator of the ferrite measurement device automatically selects an area from the outlet of the annealing water cooling section to the inlet of pickling, and contacts the calibrated probe with the same area on the strip surface 20 times. The average value of the measured ferrite values is selected as 1.8, and the value is substituted into the formula HRB = (20.784 + F^ -0.719667 ) / 0.22928 to calculate the hardness of 93.5 HRB.

[0051] Please refer to Figure 3 , the measurement position is at the production line outlet. The sample is sent to the laboratory and the hardness is detected by a hardness tester to be 93.5 HRB. The measurement and calculation results according to the method of the present invention are consistent with the laboratory standard detection results.

[0052] Example 3

[0053] The stainless steel strip meets the requirements of nickel-saving austenitic stainless steel composition and operates on a continuous annealing and pickling production line. The manipulator of the ferrite measuring device automatically selects an area from the outlet of the annealing water cooling section to the inlet of pickling, and contacts the calibrated probe with the same area on the strip surface 20 times. The average value of the measured ferrite values is selected as 2.5, and the value is substituted into the formula HRB=(20.784 + F^ -0.719667 ) / 0.22928 to calculate the hardness of 92.9 HRB.

[0054] Please refer to Figure 4 , the measurement position is at the production line outlet. The sample is sent to the laboratory and the hardness is detected by a hardness tester to be 92.9 HRB. The measurement and calculation results according to the method of the present invention are consistent with the laboratory standard detection results.

[0055] Example 4

[0056] The stainless steel strip meets the requirements of nickel-saving austenitic stainless steel composition and operates on a continuous annealing and pickling production line. The manipulator of the ferrite measuring device automatically selects an area from the outlet of the annealing water cooling section to the inlet of pickling, and contacts the calibrated probe with the same area on the strip surface 20 times. The average value of the measured ferrite values is selected as 5.0, and the value is substituted into the formula HRB=(20.784 + F^ -0.719667 ) / 0.22928 to calculate the hardness of 92.0 HRB.

[0057] Please refer to Figure 5 , the measurement position is at the production line outlet. The sample is sent to the laboratory and the hardness is detected by a hardness tester to be 92.0 HRB. The measurement and calculation results according to the method of the present invention are consistent with the laboratory standard detection results.

[0058] Example 5

[0059] Please refer to Figure 6 , the stainless steel strip meets the requirements of nickel-saving austenitic stainless steel composition and operates on a continuous annealing and pickling production line. The manipulator of the ferrite measuring device is at the outlet of the annealing water cooling section to the inlet of pickling. At 10 different areas of the stainless steel strip, the calibrated ferrite measuring probe is pressed on the strip surface and measured 20 times in the same area respectively. The average values of the ferrite values measured at different positions are selected as 0.3, 1.8, 2.5, 5.0, 4.0, 3.0, 1.5, 1.8, 0.5, 0.4 respectively.

[0060] Substitute the numerical values into the formula HRB = (20.784 + F^ -0.719667 ) / 0.22928 respectively, and calculate the hardness values 101.0HRB, 93.5HRB, 92.9HRB, 92.0HRB, 92.3HRB, 92.6HRB, 93.9HRB, 93.5HRB, 97.8HRB, 99.1HRB respectively, so as to obtain the fluctuation of the hardness of the nickel-saving austenitic stainless steel strip.

[0061] It should be noted that in this article, relational terms such as first and second are only used 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 "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent in such process, method, article or device. Without further limitation, an element defined by the statement "including an..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0062] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for on-line detecting the hardness of nickel-saving austenitic stainless steel strip, characterized in that, The method includes the following steps: Sampling data collection: Using a ferrite measuring device to collect the ferrite value of a nickel-saving austenitic stainless steel strip test sample; the nickel-saving austenitic stainless steel strip test sample is obtained after the nickel-saving austenitic stainless steel strip goes through steelmaking, hot rolling and then enters the continuous annealing and pickling production line for operation; Processing of the sampling data to obtain the hardness of the nickel-saving austenitic stainless steel strip: Inputting the ferrite value into a processor, and the processor calculates to obtain the hardness of the nickel-saving austenitic stainless steel strip; the calculation method is based on the following formula: HRB = (20.784 + F^ -0.719667 ) / 0.22928; In the formula, HRB is the Rockwell hardness value of the nickel-saving austenitic stainless steel strip, and F is the ferrite value measured by the ferrite measuring device; The surface of the nickel-saving austenitic stainless steel strip test sample for sampling data collection is divided into multiple detection areas. The ferrite measuring device measures the ferrite value multiple times in the same detection area, and based on these ferrite values, calculates the average ferrite value of this detection area, and then inputs the average ferrite value into the processor to calculate the hardness of the nickel-saving austenitic stainless steel strip; The nickel-saving austenitic stainless steel strip test sample is placed on a conveying device, and the conveying device drives the nickel-saving austenitic stainless steel strip test sample to move forward 1 to 2 meters per minute; The temperature range of the test sample of the nickel-saving austenitic stainless steel strip is 20°C to 40°C.

2. The method for on-line detecting the hardness of nickel-saving austenitic stainless steel strip according to claim 1, characterized in that, The ferrite measuring device collects the ferrite value of the nickel-saving austenitic stainless steel strip test sample 10 to 20 times per minute.

3. The method for on-line detecting the hardness of nickel-saving austenitic stainless steel strip according to claim 1, characterized in that, Before the ferrite measuring device is used for detection, first calibrate the ferrite measuring device with a ferrite measuring device standard piece.

4. A ferrite detection device applied to the method according to any one of claims 1-3, characterized in that, The device includes a sampling data collection unit and a sampling data processing unit. The data collection unit includes a ferrite detection probe, a manipulator and a controller. The sampling data processing unit includes a processor, a memory and a display. The ferrite detection probe is installed at the end of the manipulator. The output end of the controller is connected to the input end of the manipulator. The output end of the ferrite detection probe is respectively connected to the input end of the processor, the input end of the memory and the input end of the display. The output end of the processor is respectively connected to the input end of the memory and the input end of the display.

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