Manufacturing process of super duplex stainless steel formed and forged pipe fitting

Abstract

The invention discloses a manufacturing process of a super duplex stainless steel formed forged pipe fitting, and relates to the technical field of metal processing and manufacturing, an X-ray diffractometer is used for carrying out size analysis on crystal grains of a plurality of forged pipe fittings in a heating furnace to obtain a pipe fitting solid solution value, so that the average size level of the crystal grains in the forged pipe fittings is reflected; the method comprises the following steps of: screening out a suspected overheat sub-region and a normal heating sub-region adjacent to the suspected overheat sub-region, and obtaining a suspected analysis value by comparing and analyzing the suspected overheat sub-region and the normal heating sub-region adjacent to the suspected overheat sub-region; the total deviation degree of the heating temperatures of the suspected overheating sub-area and the adjacent normal heating sub-area at all the same monitoring nodes and the temperature change degree in different time periods are reflected through the suspected analysis value, the recognition accuracy of the overheating sub-area is improved, the position of the overheating forged pipe fitting is further determined, and the accuracy of the overheating forged pipe fitting is improved. And reference data is provided for specifically solving the problem of overheating of the forged pipe fitting caused by the overheating sub-region.

Description

Technical Field

[0001] The invention relates to the technical field of metal processing and manufacturing, and in particular to a manufacturing process for a super duplex stainless steel formed forged pipe fitting. Background Art

[0002] In the manufacturing process of super duplex stainless steel forged pipe fittings, solution heat treatment is one of the key processes. Its purpose is to fully dissolve the alloy elements in the matrix and obtain a uniform austenite and ferrite dual-phase structure, thereby ensuring the performance of the pipe fittings. Traditional manufacturing processes often lack effective overheating sub-area identification and precise temperature adjustment methods, making it difficult to meet the needs of high-quality pipe fittings production.

[0003] In the prior art, it is difficult to accurately identify overheated sub-regions and it is impossible to make reasonable temperature adjustments according to the overheating situation, resulting in the problem that the quality of pipe fittings is affected. Therefore, the present application uses an X-ray diffractometer to perform size analysis on the grains of multiple forged pipe fittings in the heating furnace to obtain the solid solution value of the pipe fittings, thereby reflecting the overall state of the grain size during the solution heat treatment process. At the same time, suspected overheated sub-regions are screened and identified, and the suspected overheated sub-regions are compared and analyzed with the adjacent normal heating sub-regions to further determine the position of the overheated forged pipe fittings, improve the accuracy of identifying overheated sub-regions, and perform consistency analysis on multiple overheated sub-regions to obtain matching analysis values, measure the similarity between multiple overheated sub-regions, thereby reflecting the degree of difference between each overheated sub-region, and formulate reasonable adjustment strategies based on the degree of difference between each overheated sub-region to improve the efficiency of solution heat treatment. Summary of the invention

[0004] The purpose of the present invention is to provide a super duplex stainless steel formed forged pipe manufacturing process to solve the above-mentioned problem in the prior art that it is difficult to accurately identify the overheating sub-area and it is impossible to reasonably adjust the temperature according to the overheating situation, resulting in the quality of the pipe being affected.

[0005] In a first aspect, a super duplex stainless steel formed forged pipe manufacturing process comprises: After solution heat pretreatment, the solid solution value of the pipe is obtained and compared with the solid solution threshold of the pipe to obtain a suspected overheating sub-area or a normal heating sub-area; Obtain the deviation comparison value and the change comparison value, and perform quantification processing to obtain an overheating signal; Based on the overheating signal, the degree approach value and trend approach value are obtained, and quantitative processing is performed to obtain stable analysis results; Wherein, the stability analysis result includes a single adjustment signal or a local adjustment signal; According to the stability analysis results, the required temperature adjustment value is obtained, and the solution temperature of the heating furnace is adjusted.

[0006] Beneficial effects of the present invention: The present invention uses an X-ray diffractometer to perform size analysis on the grains of multiple forged pipe fittings in a heating furnace to obtain the solid solution value of the pipe fittings, thereby reflecting the average size level of the grains in the forged pipe fittings and reflecting the overall state of the grain size of the forged pipe fittings during the solid solution heat treatment process. At the same time, the suspected overheating sub-region is screened out, and the suspected overheating sub-region is compared and analyzed with its adjacent normal heating sub-region to obtain the suspected analysis value, so that the suspected analysis value reflects the overall deviation degree of the heating temperature of the suspected overheating sub-region and the adjacent normal heating sub-region at each same monitoring node, as well as the degree of temperature change in different time periods, which not only improves the recognition accuracy of the overheating sub-region, further determines the position of the overheated forged pipe fitting, but also provides reference data for targetedly solving the problem of overheating of the forged pipe fitting caused by the overheating sub-region; The present invention performs consistency analysis on multiple overheating sub-regions to obtain a matching analysis value. The matching analysis value measures the similarity between multiple overheating sub-regions from the temperature proximity of different overheating sub-regions exceeding the rated solution temperature and the matching degree of the change trend, thereby reflecting the difference between each overheating sub-region. According to the difference between each overheating sub-region, a reasonable adjustment strategy is formulated to improve the efficiency of the solution heat treatment work. According to the present invention, when a local adjustment signal is generated based on the stability analysis result, the superheat degree value corresponding to the overheat sub-region is extracted, and the summed average calculation is performed to obtain the required temperature adjustment value, so as to complete the solid solution temperature adjustment work of the heating furnace. When a single adjustment signal is generated, the superheat degree value corresponding to the overheat sub-region is extracted as the required temperature adjustment value, so as to complete the solid solution temperature adjustment work of the heating furnace. Therefore, according to different analysis results, the required temperature adjustment value can be obtained in a targeted manner, which not only improves the control accuracy of the solid solution heat treatment temperature of the heating furnace, ensures that each overheat sub-region can be reasonably adjusted, but also improves the control efficiency of the solid solution heat treatment temperature of the heating furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0008] Figure 1 It is a flow chart of an overheating sub-region identification method provided by a super duplex stainless steel forming forged pipe manufacturing process of the present invention; Figure 2 The present invention is a flowchart of an overheating adjustment method provided by a manufacturing process for a super duplex stainless steel forming forged pipe fitting. DETAILED DESCRIPTION

[0009] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention. Embodiment 1

[0010] A super duplex stainless steel forged pipe manufacturing process provided in the first embodiment of the present invention specifically comprises the following steps: The present invention is applicable to the chemical composition of ASTM A182 F55 forged pipe fittings, which are specifically as follows: C: 0.030%; Si: 1.00%; Mn: 1.00%; P: 0.030%; S: 0.010%; Ni: 6.0%; Cr%: 24.0%; Mo: 3.0; Cu: 0.50%; N: 0.20%; W: 0.50%; PREN: 40%; Casting heating: The forging heating temperature is set to 1020°C. When heating, step heating can be performed. During the heating process, keep the temperature at 650°C for 2 hours, then raise it to the heating temperature for keeping the temperature; Forging: Forging should go through at least one upsetting and three drawing, the forging ratio should be no less than 4, and the forging fire times should be at most 3, so as to ensure the uniformity of the internal structure of the forging through multiple upsetting and drawing, and eliminate or reduce casting defects such as looseness, segregation, columnar crystals, etc. Through the solution water quenching heat treatment method: the quenching holding temperature is 1130℃, the holding time is calculated according to (1.2min*T / mm) / 60min, water cooling is adopted (the cooling medium temperature is controlled within 40℃), and the furnace temperature should not exceed 300℃. Embodiment 2

[0011] A second embodiment of the present invention provides a method for manufacturing a super duplex stainless steel formed forged pipe fitting, which specifically includes the following steps: The present invention is applicable to the chemical composition of ASTM A182 F55 forged pipe fittings, which are specifically as follows: C: 0.020%; Si: 0.50%; Mn: 0.50%; P: 0.020%; S: 0.005%; Ni: 7.0%; Cr%: 25.0%; Mo: 3.5; Cu: 0.70%; N: 0.25%; W: 0.70%; PREN: 45%; Casting heating: The forging heating temperature is set to 1040°C. When heating, step heating can be performed. During the heating process, keep the temperature at 670°C for 2.5 hours, then heat it to the heating temperature for keeping the temperature. Forging: Forging should go through at least one upsetting and three drawing, the forging ratio should be no less than 4, and the forging fire times should be at most 3, so as to ensure the uniformity of the internal structure of the forging through multiple upsetting and drawing, and eliminate or reduce casting defects such as looseness, segregation, columnar crystals, etc. Through the solution water quenching heat treatment method: the quenching holding temperature is 1130℃, the holding time is calculated according to (1.2min*T / mm) / 60min, water cooling is adopted (the cooling medium temperature is controlled within 40℃), and the furnace temperature should not exceed 300℃. Embodiment 3

[0012] A method for manufacturing a super duplex stainless steel forged pipe fitting provided in Embodiment 3 of the present invention specifically comprises the following steps: The present invention is applicable to the chemical composition of ASTM A182 F55 forged pipe fittings, which are specifically as follows: C: 0.025%; Si: 0.80%; Mn: 0.70%; P: 0.025%; S: 0.007%; Ni: 8.0%; Cr%: 26.0%; Mo: 4.0; Cu: 0.80%; N: 0.30%; W: 1.00%; PREN: 50%; Casting heating: The forging heating temperature is set to 1180°C. When heating, step heating can be performed. During the heating process, keep the temperature at 680°C for 3 hours, then raise it to the heating temperature for keeping the temperature; Forging: Forging should go through at least one upsetting and three drawing, the forging ratio should be no less than 4, and the forging fire times should be at most 3, so as to ensure the uniformity of the internal structure of the forging through multiple upsetting and drawing, and eliminate or reduce casting defects such as looseness, segregation, columnar crystals, etc. Through the solution water quenching heat treatment method: the quenching holding temperature is 1130℃, the holding time is calculated according to (1.2min*T / mm) / 60min, water cooling is adopted (the cooling medium temperature is controlled within 40℃), and the furnace temperature should not exceed 300℃. Embodiment 4

[0013] A method for manufacturing a super duplex stainless steel forged pipe fitting provided in a fourth embodiment of the present invention specifically comprises the following steps: Step 1: Raw material pretreatment and inspection, including: (1) ASTM A182 F55 standard material was selected, and the chemical composition was verified by spectrometer: C: 0.021%; Si: 0.66%; Mn: 0.47%; P: 0.028%; S: 0.001%; ​​Ni: 7.1%; Cr%: 25.0%; Mo: 3.4%; Cu: 0.71%; N: 0.25%; W: 0.68%; PREN: 40%; (2) Cut the raw materials into pieces with a size of Φ400x130 mm; (3) 100% penetration testing (PT) and ultrasonic flaw detection (UT) are performed on the surface of the blank to ensure that there are no internal defects; Step 2: Control the forging process. The specific process is as follows: First stage heating: includes: First fire: (1) Preheat the heating furnace to 350°C and keep it warm for 0.5 h; (2) Place the billet in the heating furnace, heat it up at a rate of 150°C / h to 680°C and keep it warm for 3 h; (3) Continue heating to 1180°C and keep it warm for 2 h.

[0014] The second stage is temperature controlled forging; Forging is performed in the range of 1020-1180°C. (1) The billet is drawn to 255x255x250 mm, with a single forging ratio of 1.92; (2) The billet is upset to 265x265x230 mm, with a single forging ratio of 1.09; (3) The billet is drawn to 180x180x500 mm, with a single forging ratio of 2.17; Stage 3 Reheating: Second fire: return the drawn billet to the furnace and reheat it to 1150℃ and keep it warm for 0.5h.

[0015] The fourth stage of temperature controlled forging: The reheated billet is drawn for the final time to 127x127x1000 mm, with a single forging ratio of 2.

[0016] Stage 5 Reheating: Third fire: return the drawn billet to the furnace and reheat it to 1150℃ and keep it warm for 0.5h (the keeping time is calculated based on the maximum cross-sectional area, at 0.5-0.8MM / min and 1 / 2 of the maximum thickness).

[0017] The sixth stage is rounding: the four corners of the square billet after final forging and heating are rounded to a round bar with a diameter of 135. The total forging ratio is controlled at 9.09; The seventh stage of cooling: Place the rounded forged rod on dry sand to cool.

[0018] Step 3: Cold forming process control, the process is as follows: The straight tube to be bent is accurately placed in a special mold, and two spherical pressure heads are respectively placed against the two ends of the straight tube as support and guide. Then the tube bending machine is started to gradually bend the straight tube at a certain bending rate (or bending speed).

[0019] Step 4: Solution heat treatment, the process is as follows: (1) When loading the furnace, the spacing of the forged pipes should be ≥30 mm. The temperature in the heat treatment furnace should be raised in advance before loading, and the temperature during loading should be ≤300°C. (2) During the heat treatment process, the solution treatment is performed at 1130°C for 3.5 h, and the heating rate should be ≤260°C. (3) The forged pipes are cooled to room temperature using water quenching. The temperature of the medium used for quenching is ≤38°C at the beginning and ≤49°C at any time during the quenching cycle.

[0020] Step 5: Perform non-destructive testing. The testing process is as follows: The finished pipe fittings have been subjected to liquid penetrant testing (PT) and ultrasonic testing (UT), and the forged pipe fittings have no internal defects. Embodiment 5

[0021] Figure 1 A flowchart of a super duplex stainless steel forming forged pipe manufacturing process method provided in the second embodiment of the present invention, the embodiment of the present invention can be applied to the identification of overheating sub-areas, the super duplex stainless steel forming forged pipe manufacturing process method can be executed by a super duplex stainless steel forming forged pipe manufacturing system, the super duplex stainless steel forming forged pipe manufacturing system can be implemented by software and / or hardware, and the super duplex stainless steel forming forged pipe manufacturing process system can be configured in a super duplex stainless steel forming forged pipe manufacturing equipment. Optionally, a super duplex stainless steel forming forged pipe manufacturing equipment can be an electronic device, which can be a notebook, a desktop computer, a smart tablet, etc., and the embodiment of the present invention does not limit this.

[0022] like Figure 1-Figure 2 As shown, a super duplex stainless steel forged pipe manufacturing process provided by an embodiment of the present invention specifically includes the following steps: Step 1: During the solution heat treatment cycle, the grain size of multiple forged pipes in the heating furnace is analyzed by X-ray diffractometer to obtain the pipe solid solution value, and compare it with the pipe solid solution threshold. If the pipe solid solution value is greater than the pipe solid solution threshold, a suspected overheating sub-region or a normal heating sub-region is obtained; It should be noted that the heating area in the heating furnace is divided into several heating sub-areas, wherein only one forged pipe fitting is placed in the heating sub-area; In some embodiments, the solution heat treatment cycle is divided into a number of monitoring nodes at equal time intervals; Select any one forged pipe fitting from multiple forged pipe fittings for analysis. The process is as follows: Randomly select a grain in the forged pipe; The diffraction pattern of the grains during the solution heat treatment period is obtained by an X-ray diffractometer, wherein the diffraction peak intensity at different diffraction angles is displayed in the diffraction pattern, and each diffraction peak corresponds to a different crystal plane of the grains in the forged pipe, as well as the half-height width of the diffraction peak; Randomly select the half-height width of the diffraction peak at a diffraction angle, and use the Scherrer formula: , the crystal plane size is calculated ,in, is represented by the Scherrer constant, Expressed as the X-ray wavelength, is expressed as the diffraction angle, It is expressed as the half-height width of the diffraction peak; All crystal face sizes Perform summation and mean calculation to obtain the solid solution value of the pipe fittings; It can be understood that the meaning of the solution heat treatment value is: a comprehensive statistical result of the microstructure of all grains in the forged pipe fittings, not the characteristic value of a single crystal plane or a single grain, reflecting the average size level of the grains in the forged pipe fittings, and reflecting the overall state of the grain size of the forged pipe fittings during the solution heat treatment process; The solution fitting value is compared to the solution fitting threshold value as follows: If the solid solution value of the pipe fitting is greater than the solid solution threshold value of the pipe fitting, it means that the grain size of the forged pipe fitting has grown excessively during the solid solution heat treatment process, and the heating sub-region where the suspected forged pipe fitting is located is overheated, generating a suspected overheating signal, and marking the heating sub-region corresponding to the suspected overheating signal as a suspected overheating sub-region; If the solid solution value of the pipe fitting is less than or equal to the solid solution threshold value of the pipe fitting, it means that the grain size of the forged pipe fitting has not grown excessively during the solid solution heat treatment process, and there is no overheating in the heating sub-area where the forged pipe fitting is located, and a non-overheating signal is generated, and the heating sub-area corresponding to the non-overheating signal is marked as a normal heating sub-area; Step 2: Based on the suspected overheating signal, the solid solution temperature in multiple suspected overheating sub-regions is compared and analyzed with the normal heating sub-region to obtain comparative analysis data, wherein the comparative analysis data includes a deviation comparison value and a change comparison value, and the deviation comparison value and the change comparison value are quantified to obtain the overheating signal; In some embodiments, one suspected overheating sub-region is arbitrarily selected from a plurality of suspected overheating sub-regions; Obtain the normally heated sub-region adjacent to the suspected overheated sub-region; It should be noted that the adjacent normal heating sub-regions include but are not limited to the normal heating sub-regions in the vertical direction to the suspected overheating sub-region, the normal heating sub-regions in the horizontal direction to the suspected overheating sub-region, and the normal heating sub-regions in the diagonal direction to the suspected overheating sub-region; Obtain the heating temperature of the suspected overheated sub-area at all monitoring nodes and sort them according to the time series to obtain a comparison analysis set , where n represents the total number of monitoring nodes, It is represented by the heating temperature corresponding to the nth monitoring node in the suspected overheated sub-area; Get the heating temperatures of adjacent normal heating sub-areas at all monitoring nodes, sort them according to the time series, and integrate the comparative analysis matrix: , where n represents the total number of monitoring nodes, and m represents the total number of adjacent normal heating sub-areas. It is represented as the heating temperature of the first adjacent normal heating sub-area at the nth monitoring node, It is represented as the heating temperature of the mth adjacent normal heating sub-area at the first monitoring node, It is represented as the heating temperature of the mth adjacent normal heating sub-area at the nth monitoring node period; Arbitrarily extract a horizontal sequence from the comparison analysis matrix as a set of comparison benchmarks ; The comparison analysis set and the comparison benchmark set are placed in the order of the same monitoring nodes, and the heating temperatures corresponding to the same monitoring nodes are substituted into the Euclidean distance formula: , calculate the unit degree value , where n represents the nth monitoring node, It is represented by the heating temperature of the suspected overheated sub-area at the nth monitoring node, It is represented by the heating temperature of the adjacent normal heating sub-area at the nth monitoring node period. Set all unit degree values Perform summation and mean calculation, and perform ratio calculation with the rated solution temperature to obtain the deviation comparison value; It should be noted that the rated solution temperature is set by personnel in this technical field on the heating furnace and is an empirical value; Compare and analyze the collection The inner adjacent elements are combined into a set of unit alignment groups, and a plurality of unit alignment groups are obtained; Any set of unit alignment groups; Subtract the adjacent elements in the unit comparison group, take the absolute value, and calculate the ratio with the solid solution rated temperature to obtain the comparison change sub-value; Combining adjacent elements in the comparison benchmark set into a set of unit benchmark groups to obtain a plurality of unit benchmark groups; Any set of unit benchmark groups; Subtract the adjacent elements in the unit benchmark group, take the absolute value, and calculate the ratio with the solid solution rated temperature to obtain the benchmark change sub-value; It should be noted that the number of unit comparison groups and unit benchmark groups is the same; Substitute all comparison variables and reference variables into the Euclidean formula: , calculate the unit change value , where b represents the total number of unit comparison groups or the total number of unit benchmark groups, It is represented by the alignment change subvalue corresponding to the b-th unit alignment group, It is represented as the benchmark change sub-value corresponding to the b-th unit benchmark group; Exemplarily, the unit comparison groups are A1, B1 and C1, and the unit reference groups are A2, B2 and C2; It should be noted that the two endpoint monitoring nodes corresponding to the A1 unit comparison group are the same as the two endpoint monitoring nodes corresponding to the A2 unit benchmark group, the two endpoint monitoring nodes corresponding to the B1 unit comparison group are the same as the two endpoint monitoring nodes corresponding to the B2 unit benchmark group, and the two endpoint monitoring nodes corresponding to the C1 unit comparison group are the same as the two endpoint monitoring nodes corresponding to the C2 unit benchmark group; All unit change values ​​E are summed and averaged to obtain the change comparison value; The deviation comparison value and the change comparison value are summed to obtain the suspected analysis value; It can be understood that the suspected analysis value means: to evaluate the temperature of the suspected overheating sub-area. Specifically, on the one hand, the deviation comparison value reflects the overall deviation of the heating temperature of the suspected overheating sub-area and the adjacent normal heating sub-area at each same monitoring node. On the other hand, the change comparison value reflects the temperature change degree of the suspected overheating sub-area and the adjacent normal heating sub-area in different time periods, thereby improving the recognition accuracy of the overheating sub-area, further determining the location of the overheated forged pipe fittings, and providing reference data for targeted solution to the problem of overheating of forged pipe fittings caused by the overheating sub-area. The suspected analysis value is compared with the suspected analysis threshold value as follows: If the suspected analysis value is greater than the suspected analysis threshold, it means that the difference between the suspected overheating sub-region and the normal heating sub-region is greater, an overheating signal is generated, and the suspected overheating sub-region corresponding to the overheating signal is marked as an overheating sub-region; If the suspected analysis value is less than or equal to the suspected analysis threshold, it means that the difference between the suspected overheating sub-region and the normal heating sub-region is smaller, and a continued monitoring signal is generated; The specific implementation scheme of the embodiment of the present invention is: the grain size analysis of multiple forged pipe fittings in the heating furnace is performed by an X-ray diffractometer to obtain the solid solution value of the pipe fittings, thereby reflecting the average size level of the grains in the forged pipe fittings, and reflecting the overall state of the grain size of the forged pipe fittings during the solid solution heat treatment process. At the same time, the suspected overheating sub-region is screened out, and the suspected overheating sub-region is compared and analyzed with its adjacent normal heating sub-region to obtain the suspected analysis value, so that the suspected analysis value reflects the overall deviation of the heating temperature of the suspected overheating sub-region and the adjacent normal heating sub-region at each same monitoring node, as well as the degree of temperature change in different time periods. This not only improves the recognition accuracy of the overheating sub-region, further determines the position of the overheated forged pipe fitting, but also provides reference data for targeted solution to the problem of overheating of the forged pipe fitting caused by the overheating sub-region. Embodiment 6

[0023] like Figure 1-Figure 2 As shown, a super duplex stainless steel forged pipe manufacturing process provided by an embodiment of the present invention specifically includes the following steps: Step 3: Based on the overheating signal, a matching analysis is performed on multiple overheating sub-areas to obtain matching analysis data, wherein the matching analysis data includes a degree proximity value and a trend proximity value, and the degree proximity value and the trend proximity value are quantified to obtain a stable analysis result; Wherein, the stability analysis result includes a local adjustment signal or a single adjustment signal; In some embodiments, an overheating sub-region is arbitrarily selected from a plurality of overheating sub-regions; Extract the corresponding comparison analysis set of the overheated sub-region ; Compare and analyze the collection The heating temperature is greater than the rated temperature of the solid solution to extract the superheated element value; Compare and analyze the collection Extraction is performed at a heating temperature less than or equal to the rated solution temperature to obtain the non-overheated element value; Subtract the superheat element value from the solid solution rated temperature and calculate the ratio to obtain the superheat degree value; The variance of the overheating degree value corresponding to the overheating sub-area is calculated to obtain the unit degree variance value; All unit degree variance values ​​are combined in pairs to obtain multiple groups of overheating degree groups, and then substituted into the Euclidean distance formula: , calculate the degree of closeness ,in, Expressed as The unit degree variance value corresponding to the overheated sub-region is Expressed as The unit degree variance value corresponding to the overheated sub-region is It is expressed as the total number of superheat degree groups; Subtract the overheat element value, take the absolute value, and calculate the ratio with the solid solution rated temperature to obtain the overheat trend value; The variance of the overheating trend value corresponding to the overheating sub-area is calculated to obtain the unit trend variance value; All unit overheating trend values ​​are combined in pairs to obtain multiple groups of overheating trend groups, and then substituted into the Euclidean distance formula: , calculate the trend approach value ,in, Expressed as The unit trend variance value corresponding to the overheated sub-region, Expressed as The unit trend variance value corresponding to the overheated sub-region, It is expressed as the total number of overheating trend groups; The degree is close to the value Close to the trend The sum is calculated to obtain the coincidence analysis value; It can be understood that the meaning of the coincidence analysis value is: to quantitatively evaluate the similarity between multiple overheating sub-regions. Specifically, on the one hand, the degree of proximity reflects the degree of temperature proximity of different overheating sub-regions exceeding the rated solution temperature, and on the other hand, the trend proximity reflects the degree of consistency of the temperature variation trend of different overheating sub-regions exceeding the rated solution temperature, thereby reflecting the degree of difference between each overheating sub-region, and according to the degree of difference between each overheating sub-region, a reasonable adjustment strategy is formulated to improve the efficiency of solution heat treatment; The matching analysis value is compared with the matching degree threshold, and the process is as follows; If the coincidence analysis value is greater than the coincidence degree threshold, it means that the difference in the degree of overheating between different overheating sub-areas is greater, and the difference in the change trend is greater, and a single adjustment signal is generated; If the coincidence analysis value is less than or equal to the coincidence degree threshold, it means that the difference in the degree of overheating between different overheating sub-areas is smaller, and the difference in the change trend is smaller, and a local adjustment signal is generated; The specific implementation scheme of the embodiment of the present invention is: consistency analysis is performed on multiple overheating sub-regions to obtain matching analysis values, and the similarity between the multiple overheating sub-regions is measured through the matching analysis values ​​from the degree of temperature proximity of different overheating sub-regions exceeding the solid solution rated temperature, as well as the degree of matching in the change trend, thereby reflecting the degree of difference between each overheating sub-region, and according to the degree of difference between each overheating sub-region, a reasonable adjustment strategy is formulated in a targeted manner to improve the efficiency of the solid solution heat treatment work. Embodiment 7

[0024] like Figure 1-Figure 2 As shown, a super duplex stainless steel forged pipe manufacturing process provided by an embodiment of the present invention specifically includes the following steps: Step 4: According to the stability analysis results, obtain the required temperature adjustment value, and adjust the solution temperature of the heating furnace according to the temperature adjustment value; In some embodiments, when a local adjustment signal is generated, the overheating degree value corresponding to the overheating sub-region is extracted, and the summed average calculation is performed to obtain the required temperature adjustment value, and the current heating temperature corresponding to the overheating sub-region is subtracted from the required temperature adjustment value to complete the solution temperature adjustment work of the heating furnace; When a single adjustment signal is generated, the superheat degree value corresponding to the superheat sub-area is extracted as the required temperature adjustment value, and the magnitude is compared. Then, the current heating temperature corresponding to the superheat sub-area is subtracted from the required temperature adjustment value one by one in descending order, so as to complete the solution temperature adjustment work of the heating furnace; The specific implementation plan of the embodiment of the present invention is: according to the stability analysis result, when a local adjustment signal is generated, the superheat degree value corresponding to the overheated sub-region is extracted, and the sum mean calculation is performed to obtain the required temperature adjustment value, and the solid solution temperature adjustment work of the heating furnace is completed; when a single adjustment signal is generated, the superheat degree value corresponding to the overheated sub-region is extracted as the required temperature adjustment value, and the solid solution temperature adjustment work of the heating furnace is completed, so that according to different analysis results, the required temperature adjustment value can be obtained in a targeted manner, which not only improves the control accuracy of the solid solution heat treatment temperature of the heating furnace, ensures that each overheated sub-region can be reasonably adjusted, but also improves the control efficiency of the solid solution heat treatment temperature of the heating furnace.

[0025] The above formulas are all dimensionless and numerical calculations. The formula is a formula for the most recent real situation obtained by collecting a large amount of data and performing software simulation. The preset parameters in the formula are set by technicians in this field according to actual conditions.

[0026] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A process for manufacturing super duplex stainless steel forged pipe fittings, characterized in that: The following steps are involved: After solution heat pretreatment, the solid solution value of the pipe is obtained and compared with the solid solution threshold of the pipe to obtain a suspected overheating sub-area or a normal heating sub-area; Obtain the deviation comparison value and the change comparison value, and perform quantification processing to obtain an overheating signal; Based on the overheating signal, the degree approach value and trend approach value are obtained, and quantitative processing is performed to obtain stable analysis results; Wherein, the stability analysis result includes a single adjustment signal or a local adjustment signal; According to the stability analysis results, the required temperature adjustment value is obtained, and the solution temperature of the heating furnace is adjusted.

2. A process for manufacturing a super duplex stainless steel forged pipe fitting according to claim 1, characterized in that: The solution heat treatment process is as follows: The interval between forged pipes should be ≥30 mm, and the temperature during loading should be ≤300℃; During the heat treatment process, solution treatment was performed at 1130°C for 3.5 h, and the heating rate should be ≤260°C.

3. A super duplex stainless steel forged pipe manufacturing process according to claim 1, characterized in that: The process of obtaining the suspected overheating sub-area and the normal heating sub-area: Randomly select a forged pipe fitting and randomly select a grain in the forged pipe fitting; The diffraction angle and half-height width of the diffraction peak of the crystal grains are obtained by X-ray diffractometer, and then substituted into the Scherrer formula to calculate the crystal plane size; The sum of all crystal plane dimensions is calculated to obtain the solid solution value of the pipe; If the solid solution value of the pipe is greater than the solid solution threshold of the pipe, it is recorded as a suspected overheating sub-region; If the solid solution value of the pipe is less than or equal to the solid solution threshold of the pipe, the normal heating sub-area is recorded.

4. A process for manufacturing a super duplex stainless steel formed forged pipe fitting according to claim 3, characterized in that: The deviation comparison value is obtained as follows: Arbitrarily select a suspected overheated sub-region; Obtain the normally heated sub-region adjacent to the suspected overheated sub-region; Construct a comparative analysis set and a comparative analysis matrix; Obtain the comparison benchmark set, compare it with the comparison analysis set, calculate the unit degree value through the Euclidean distance formula, perform summation and mean calculation, and perform ratio calculation with the solid solution rated temperature to obtain the deviation comparison value.

5. A process for manufacturing a super duplex stainless steel formed forged pipe fitting according to claim 1, characterized in that: The change comparison value is obtained as follows: Obtain a unit comparison group, make a difference between adjacent elements in the unit comparison group, take the absolute value, and calculate the ratio with the solid solution rated temperature to obtain the comparison change sub-value; Obtain a unit benchmark group, make a difference between adjacent elements in the unit benchmark group, take the absolute value, and calculate the ratio with the solid solution rated temperature to obtain the benchmark change sub-value; Substitute all comparison change sub-values ​​and benchmark change sub-values ​​into the Euclidean formula to calculate the unit change value, perform summation and mean calculation, and obtain the change comparison value.

6. A process for manufacturing a super duplex stainless steel formed forged pipe fitting according to claim 1, characterized in that: The overheat signal generation process is as follows: The deviation comparison value and the change comparison value are summed to obtain the suspected analysis value; If the suspected analysis value is greater than the suspected analysis threshold, an overheating signal is generated, and the suspected overheating sub-region corresponding to the overheating signal is marked as an overheating sub-region.

7. A process for manufacturing a super duplex stainless steel forged pipe fitting according to claim 4, characterized in that: The degree of closeness is obtained as follows: Select an overheated sub-region at random; Extract the heating temperature greater than the rated temperature of the solid solution in the comparison analysis set as the overheat element value, subtract it from the rated temperature of the solid solution, calculate the ratio, and obtain the overheat degree value; Calculate the variance of all overheating degree values ​​to obtain the unit degree variance value; All unit degree variance values ​​are combined in pairs to obtain multiple groups of overheating degree groups, which are substituted into the Euclidean distance formula to obtain the degree proximity value.

8. A process for manufacturing a super duplex stainless steel formed forged pipe fitting according to claim 7, characterized in that: The trend approach value is obtained as follows: Subtract the overheat element value, take the absolute value, and calculate the ratio with the solid solution rated temperature to obtain the overheat trend value; The variance of all overheating trend values ​​is calculated, and all unit overheating trend values ​​are combined in pairs to obtain multiple groups of overheating trend groups, which are substituted into the Euclidean distance formula to calculate the trend proximity value.

9. A process for manufacturing a super duplex stainless steel formed forged pipe fitting according to claim 1, characterized in that: The generation process of stability analysis results is as follows: The degree closeness value and the trend closeness value are summed to obtain the coincidence analysis value; If the coincidence analysis value is greater than the coincidence degree threshold, a single adjustment signal is generated; If the coincidence analysis value is less than or equal to the coincidence degree threshold, a local adjustment signal is generated.

10. A process for manufacturing a super duplex stainless steel formed forged pipe fitting according to claim 1, characterized in that: Obtain the required temperature adjustment value and adjust the solution temperature of the heating furnace. The process is as follows: When a local adjustment signal is generated, the overheating degree value corresponding to the overheating sub-area is extracted, and the summed average calculation is performed to obtain the required temperature adjustment value, and the current heating temperature corresponding to the overheating sub-area is subtracted from the required temperature adjustment value to complete the solution temperature adjustment work of the heating furnace; When a single adjustment signal is generated, the superheat degree value corresponding to the superheat sub-area is extracted as the required temperature adjustment value, and a size comparison is performed. In order from large to small, the current heating temperature corresponding to the superheat sub-area is subtracted from the required temperature adjustment value one by one to complete the solid solution temperature adjustment work of the heating furnace.

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