Solution heat treatment method of er2209 welding dual-phase steel wire rod

Abstract

The application provides a solid solution heat treatment method of ER2209 welding dual-phase steel wire rod.The solid solution heat treatment method of the ER2209 welding dual-phase steel wire rod comprises the following steps: S1, furnace loading; S2, heating; S3, heat preservation; S4, rapid cooling; and S5, post-treatment.The solid solution heat treatment method of the ER2209 welding dual-phase steel wire rod can make the precipitated sigma phase, carbide and nitride fully dissolve into the matrix by precisely controlling the solid solution treatment temperature in the range of 1050-1100 DEG C, so that the grain is prevented from excessively growing; the heat preservation time is calculated in a reasonable way and is adjusted in combination with the wire rod diameter or the wire rod coil size, so that the overall temperature of the wire rod cross section is ensured to be uniform; the wire rod is rapidly cooled to room temperature, so that the re-precipitation of harmful phases is effectively inhibited; and the elongation and the area reduction of the wire rod after the treatment are significantly improved, and the welding process is good.

Description

Technical Field

[0001] This invention relates to the field of heat treatment technology for metallic materials, and in particular to a solution heat treatment method for duplex steel wire rods used in welding ER2209. Background Technology

[0002] ER2209 is a nitrogen-alloyed duplex stainless steel welding material. Its chemical composition typically includes elements such as Cr, Ni, Mo, and N. Its microstructure consists of two phases: ferrite (α) and austenite (γ). This welding wire is widely used in welding duplex stainless steel structures in fields such as marine engineering, petrochemicals, and shipbuilding.

[0003] During the drawing and straightening processes, duplex stainless steel wire rods undergo work hardening due to cold deformation. In addition, during the upstream smelting and rolling production, the cooling rate can affect the microstructure, potentially causing the precipitation of harmful σ phase, χ phase, or nitrogen-containing inclusions. This leads to a decrease in the plasticity and corrosion resistance of the welding wire. To ensure that the welding wire has good processing performance, stable welding processability, and excellent mechanical and corrosion resistance of the welded joint, solution heat treatment of the hot-rolled wire rod is necessary.

[0004] In the existing technology, the solution heat treatment of ER2209 hot-rolled wire rod has problems such as inaccurate heating temperature control, unreasonable holding time, and insufficient cooling rate, which can easily lead to an imbalance in the two-phase ratio, coarse grains, or residual precipitates, affecting the overall performance of the welding wire.

[0005] Therefore, it is necessary to provide a solution heat treatment method for ER2209 welding duplex steel wire rod to solve the above-mentioned technical problems. Summary of the Invention

[0006] This invention provides a solution heat treatment method for ER2209 welding duplex steel wire rod, which solves the problems of inaccurate heating temperature control, unreasonable holding time, and insufficient cooling rate in the solution heat treatment of ER2209 hot-rolled wire rod in the prior art.

[0007] To solve the above technical problems, the present invention provides a solution heat treatment method for ER2209 welding duplex steel wire rod, comprising the following steps: S1: loading the furnace; placing the welding duplex steel wire rod in the heat treatment furnace in the form of coils or straight bars, ensuring that there are gaps between the coils to avoid them being tightly attached to each other and affecting the uniformity of heating;

[0008] S2: Heating; The furnace temperature is raised to the solution treatment temperature of 1050 to 1100°C at a heating rate of 10 to 30°C / min, and the atmosphere inside the furnace is air during the heating process;

[0009] S3: Heat preservation; heat preservation at the solution treatment temperature for 60, 90, and 120 min, and establish a control group to explore the optimal solution preservation time;

[0010] S4: Rapid cooling; After the heat treatment is completed, the wire rod is quickly removed from the heat treatment furnace and cooled to room temperature in water within 15 seconds.

[0011] S5: Post-processing; after cooling, the wire rod is pickled to remove the oxide scale and obtain the finished product, solid solution acid white wire rod.

[0012] Preferably, the solution treatment temperature in step S2 is between 1050 and 1100°C.

[0013] Preferably, the temperature of the cooling medium in S4 is controlled between 15 and 30°C, and the cooling medium is kept circulating during the cooling process to ensure uniform cooling.

[0014] Preferably, in step S4 of the solution heat treatment method for duplex steel wire rod for welding ER2209, a transfer device is required during the removal process. The transfer device includes a base.

[0015] A lifting component is fixedly installed on one side of the top of the base. A first driving component is fixedly connected to the top end of the output shaft of the lifting component. A fixed arm is fixedly connected to the top end of the output shaft of the first driving component. An adjustment device is fixedly installed on one side of the top of the fixed arm.

[0016] A mobile device is slidably mounted on one side of the outer surface of the fixed arm. A mounting plate is fixedly connected to one side of the mobile device, and clamping devices are provided around one side of the surface of the mounting plate.

[0017] Preferably, a cooling pool is fixedly installed on the other side of the top of the base, a water inlet pipe is provided on one side of the cooling pool, a drain pipe is provided on the other side of the cooling pool, and a water pump is provided on one side of both the water inlet pipe and the drain pipe.

[0018] Preferably, the adjusting device includes a fixed block, a second driving member, and a threaded screw. The fixed block is fixedly installed on one side of the top of the fixed arm, the second driving member is fixedly installed on one side of the outer surface of the fixed block, and the threaded screw is fixedly connected to one end of the output shaft of the second driving member.

[0019] Preferably, the moving device includes a moving arm, a sleeve groove, a moving block, and a first threaded hole. The moving arm is sleeved on one side of the outer surface of the fixed arm, the sleeve groove is opened in the middle of one side of the outer surface of the moving arm, the moving block is fixedly installed on the top side of the moving arm, and the first threaded hole is opened in the middle of one side of the outer surface of the moving block.

[0020] Preferably, the mounting plate includes a mounting plate, a sliding groove, a fixing bracket, a third driving component, and a threaded post. The mounting plate is fixedly mounted on one side of the outer surface of the moving arm. The four sliding grooves are equidistantly formed around one side of the surface of the mounting plate. The four fixing brackets are equidistantly fixedly mounted around the outer surface of the mounting plate. The third driving component is fixedly mounted on one side of the outer surface of the fixing bracket. The threaded post is fixedly connected to the end of the output shaft of the third driving component.

[0021] Preferably, the clamping device includes a slider, a second threaded hole, and a clamping plate. The slider is slidably installed on one side inside the groove, the second threaded hole is opened on one side of the outer surface of the slider, and the clamping plate is fixedly installed on one side of the outer surface of the slider.

[0022] Preferably, the slider is threaded to the outer surface of the threaded post through the second threaded hole.

[0023] Compared with related technologies, the solution heat treatment method for ER2209 welding duplex steel wire rod provided by the present invention has the following beneficial effects:

[0024] This invention provides a solution heat treatment method for ER2209 welding duplex steel wire rod. By precisely controlling the solution treatment temperature within the range of 1050~1100℃, the precipitated σ phase, carbides, and nitrides can be fully dissolved into the matrix, while avoiding excessive grain growth and ensuring uniform microstructure. A reasonable method for calculating the holding time is adopted and adjusted in conjunction with the wire rod diameter or coil size to ensure uniform temperature across the wire rod cross-section and sufficient microstructure transformation. Rapid cooling to room temperature effectively inhibits the re-precipitation of harmful phases, resulting in an ideal ferrite / austenite two-phase ratio of approximately 40~60%. The elongation and reduction of area of ​​the wire rod are significantly improved after treatment, and the weldability is good. Attached Figure Description

[0025] Figure 1 A schematic diagram of the structure of a first embodiment of a solution heat treatment method for ER2209 welding duplex steel wire rod provided by the present invention;

[0026] Figure 2 The metallographic structure and mechanical properties of ER2209 wire rod after solution heat treatment at 1050℃ in Example 1 of the solution heat treatment method for ER2209 welding duplex steel wire rod provided by the present invention are shown in the figure.

[0027] Figure 3 The metallographic structure and mechanical properties of ER2209 wire rod after solution heat treatment at 1100℃ in Example 2 of the solution heat treatment method for ER2209 welding duplex steel wire rod provided by the present invention are shown in the figure.

[0028] Figure 4 This is a schematic diagram of the second embodiment of the solution heat treatment method for ER2209 welding duplex steel wire rod provided by the present invention;

[0029] Figure 5 for Figure 4 The diagram shows the structure of the mobile device.

[0030] Figure 6 for Figure 4 The diagram shows the structure of the regulating device.

[0031] Figure 7 for Figure 4 The enlarged schematic diagram of part A is shown.

[0032] The following are the labels in the diagram: 1. Base, 2. Lifting component, 3. Connecting column, 4. First driving component, 5. Fixed arm, 6. Adjusting device, 61. Fixed block, 62. Second driving component, 63. Threaded screw, 7. Moving device, 71. Moving arm, 72. Sleeve groove, 73. Moving block, 74. First threaded hole, 8. Mounting plate, 81. Mounting plate, 82. Slide groove, 83. Fixed frame, 84. Third driving component, 85. Threaded column, 9. Clamping device, 91. Slider, 92. Second threaded hole, 93. Clamping plate, 10. Cooling pool, 11. Water inlet pipe, 12. Drain pipe, 13. Water pump. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0034] First Embodiment

[0035] Please refer to the following: Figure 1 , Figure 2 and Figure 3 ,in, Figure 1 A schematic diagram of the structure of a first embodiment of a solution heat treatment method for ER2209 welding duplex steel wire rod provided by the present invention; Figure 2 The metallographic structure and mechanical properties of ER2209 wire rod after solution heat treatment at 1050℃ in Example 1 of the solution heat treatment method for ER2209 welding duplex steel wire rod provided by the present invention are shown in the figure. Figure 3 The metallographic structure and mechanical properties of the ER2209 wire rod after solution treatment at 1100℃ are shown in Example 2 of the solution heat treatment method for ER2209 welding duplex steel wire rod provided by the present invention.

[0036] A solution heat treatment method for ER2209 welding duplex steel wire rod includes the following steps: S1: loading the furnace; placing the welding duplex steel wire rod in the heat treatment furnace in the form of coils or straight bars, ensuring that there are gaps between the coils to avoid them being tightly attached to each other and affecting the uniformity of heating;

[0037] S2: Heating; The furnace temperature is raised to the solution treatment temperature of 1050 to 1100°C at a heating rate of 10 to 30°C / min, and the atmosphere inside the furnace is air during the heating process;

[0038] S3: Heat preservation; heat preservation at the solution treatment temperature for 60, 90, and 120 min, and establish a control group to explore the optimal solution preservation time;

[0039] S4: Rapid cooling; After the heat treatment is completed, the wire rod is quickly removed from the heat treatment furnace and cooled to room temperature in water within 15 seconds.

[0040] S5: Post-processing; after cooling, the wire rod is pickled to remove the oxide scale and obtain the finished product, solid solution acid white wire rod.

[0041] The solution treatment temperature in S2 is preferably 1050 to 1100°C.

[0042] The temperature of the cooling medium in S4 is controlled between 15 and 30°C, and the cooling medium is kept circulating during the cooling process to ensure uniform cooling.

[0043] Before S2, a preheating treatment is also included, in which the coil is preheated at 300~400℃ for 15~30 minutes to reduce thermal stress during the heating process.

[0044] Example 1

[0045] This embodiment provides a solution heat treatment method for ER2209 welding duplex steel wire rod with a wire rod diameter of 5.50 mm and a chemical composition conforming to the standard in GB_T 4241-2017.

[0046] The specific steps are as follows:

[0047] (1) The coil is placed in a heat treatment furnace in the form of a coil with an outer diameter of 1.2m and an inner diameter of 0.8m;

[0048] (2) Heat to 1050℃ at a heating rate of 20℃ / min;

[0049] (3) Set the heat preservation time to 60 min, 90 min, and 120 min to find a suitable solution temperature;

[0050] (4) After the heat preservation is completed, transfer the coil to a 25°C circulating water tank to cool to room temperature within 10 seconds;

[0051] (5) After taking it out, perform pickling and passivation treatment to remove the surface oxide scale.

[0052] Figure 2The metallographic structure and corresponding mechanical properties of the material under a 500x optical microscope after solution treatment at 1050℃ for 60 min, 90 min, and 120 min are presented. Figure 2 As shown in (a) and (b), the ferrite grains exhibit a significant coarsening trend with increasing solution time. Furthermore, some fine, dispersed black σ phases gradually dissolve back into the austenite matrix during the solution process. At a solution temperature of 1050℃, the tensile strength of the material generally decreases with increasing holding time. As shown in Table 1, when the solution time is increased from 60 min to 90 min, the tensile strength decreases only slightly, and the strength-ductility ratio does not change significantly. However, when the time is further extended to 120 min, the tensile strength decreases from 772 MPa to 752 MPa, while the elongation after fracture decreases from 47.3% to 45.0%. Figure 2 (c) It can be seen that some fine black σ phase appears in the structure at this time; as a hard and brittle intermetallic compound, the precipitation of σ phase will destroy the continuity of the matrix, cause local stress concentration, and lead to embrittlement of the material, thereby significantly reducing the elongation; it is believed that under the solid solution condition of 120 min, the rate of σ phase precipitation in the sensitive temperature range during the cooling stage is insufficient, which leads to the re-precipitation of σ phase during the equilibrium cooling process, thereby deteriorating the plasticity of the material.

[0053] Table 1

[0054] time Maximum force (Fm) Tensile strength (Rm) Specified plastic elongation strength (Rp0.2) Elongation after fracture (A) Reduction of area (Z) Original cross-sectional area (So) kN MPa MPa % % (none) Solution treatment temperature 1050℃, 60 min 18.35 772.16 379.98 47.73 81.90 23.76 Solution treatment temperature 1050℃, 90 min 18.28 769.59 395.91 48.33 79.34 23.76 Solution treatment temperature 1050℃, 120 min 17.87 752.12 367.08 45.00 80.96 23.76

[0055] Example 2

[0056] The difference between this embodiment and Embodiment 1 is that the solution treatment temperature is 1100℃, the holding time is still 60, 90, and 120 minutes, and the cooling medium is a 25℃ circulating water tank.

[0057] Figure 3The metallographic structure and corresponding mechanical properties of the material under a 500x optical microscope after solution treatment at 1100℃ for 60 min, 90 min, and 120 min are shown. Compared with Example 1 (solution treatment at 1050℃), the grain size shows a more significant coarsening trend with increasing solution temperature. According to Table 3, under 1100℃ solution treatment conditions, the tensile strength of the material gradually decreases with prolonged holding time, from 782.23 MPa at 60 min to 766.82 MPa at 90 min, and further to 758.38 MPa at 120 min. The specified plastic elongation strength (Rp0.2) also gradually decreases from 377.18 MPa (60 min) to 338.99 MPa (120 min). Simultaneously, the elongation after fracture (A) slightly increases from 48.33% (60 min) to 49.07% (120 min). The reduction of area (Z) also increased from 79.99% to 82.21%, indicating a slight improvement in the material's plasticity. Metallographic observation showed that no σ phase precipitation was found at any solution treatment time. This indicates that under the solution treatment condition of 1100℃, although grain coarsening led to a decrease in strength, the precipitation of brittle phases such as σ phase was effectively avoided because the solution temperature was within a safe range, thus maintaining good plasticity of the material.

[0058] Table 2

[0059] time Maximum force (Fm) Tensile strength (Rm) Specified plastic elongation strength (Rp0.2) Elongation after fracture (A) Reduction of area (Z) Original cross-sectional area (So) kN MPa MPa % % (none) Solution treatment temperature 1100℃, 60 min 18.58 782.23 377.18 48.33 79.99 23.76 Solution treatment temperature 1100℃, 90 min 18.22 766.82 360.63 49.00 82.21 23.76 Solution treatment temperature 1100℃, 120 min 18.02 758.38 338.99 49.07 81.90 23.76

[0060] A comparison of Examples 1 and 2 revealed that under the conditions of solution treatment at 1050℃ and holding for 120 min, black blocky σ phase appeared in the tissue, causing the elongation to decrease from 47.73% to 45.00%, resulting in significant embrittlement. This was due to the temperature being close to the sensitive range for σ phase precipitation and the insufficient cooling rate.

[0061] No σ phase precipitation was observed in the metallographic structure during all treatment times (60–120 min) at 1100℃. This indicates that 1100℃ is within a safer austenite-ferrite two-phase region, effectively avoiding the rapid precipitation temperature range of the σ phase and ensuring the purity of the matrix structure. Treatment at 1100℃ achieved a better balance between strength and plasticity. Although the strength was slightly lower than at 1050℃ and 60 min due to grain coarsening, the elongation significantly increased to 48%–49%, and the reduction of area (Z) remained above 80%, demonstrating good plasticity reserves. At 1100℃, as the holding time increased from 60 min to 120 min, the tensile strength gradually decreased from 782 MPa to 758 MPa, while the elongation slightly increased (48.33% → 49.07%), maintaining a stable strength-plasticity balance. 1100℃ showed low sensitivity to holding time; 60–120 Within the specified range, no brittle phases precipitate, resulting in good microstructure stability and enhanced process tolerance. However, at 1050℃, if the time is prolonged or the cooling is not properly controlled, σ phase precipitation is likely to occur, leading to deterioration of plasticity. Therefore, the solution treatment process is recommended: 1100℃ for 60~90 min, followed by water quenching. This process can effectively eliminate the risk of precipitation of harmful phases such as σ phase, and also achieve a good balance between strength and plasticity (tensile strength ≥760 MPa, elongation ≥48%), making it the optimal choice that balances performance stability and process reliability.

[0062] Compared with related technologies, the solution heat treatment method for ER2209 welding duplex steel wire rod provided by the present invention has the following beneficial effects:

[0063] This invention provides a solution heat treatment method for ER2209 welding duplex steel wire rod. By precisely controlling the solution treatment temperature within the range of 1050~1100℃, the precipitated σ phase, carbides, and nitrides can be fully dissolved into the matrix, while avoiding excessive grain growth and ensuring uniform microstructure. A reasonable method for calculating the holding time is adopted and adjusted in conjunction with the wire rod diameter or coil size to ensure uniform temperature across the wire rod cross-section and sufficient microstructure transformation. Rapid cooling to room temperature effectively inhibits the re-precipitation of harmful phases, resulting in an ideal ferrite / austenite two-phase ratio of approximately 40~60%. The elongation and reduction of area of ​​the wire rod are significantly improved after treatment, and the weldability is good.

[0064] Second Embodiment

[0065] Please refer to the following: Figure 4 , Figure 5 , Figure 6 and Figure 7Based on the solution heat treatment method for ER2209 welding duplex steel wire rod provided in the first embodiment of this application, the second embodiment of this application proposes another solution heat treatment method for ER2209 welding duplex steel wire rod. The second embodiment is merely a preferred embodiment of the first embodiment, and the implementation of the second embodiment will not affect the separate implementation of the first embodiment.

[0066] Specifically, the difference in the solution heat treatment method for ER2209 welding duplex steel wire rod provided in the second embodiment of this application is that a transfer device is required in the removal process of step S4 of the solution heat treatment method for ER2209 welding duplex steel wire rod. The transfer device includes: a base 1.

[0067] Lifting component 2 is fixedly installed on one side of the top of the base 1. The top end of the output shaft of the lifting component 2 is fixedly connected to a first driving component 4. The top end of the output shaft of the first driving component 4 is fixedly connected to a fixed arm 5. An adjustment device 6 is fixedly installed on one side of the top of the fixed arm 5.

[0068] The moving device 7 is slidably mounted on one side of the outer surface of the fixed arm 5. A mounting plate 8 is fixedly connected to one side of the moving device 7. Clamping devices 9 are provided around one side of the surface of the mounting plate 8.

[0069] A cooling pool 10 is fixedly installed on the other side of the top of the base 1. A water inlet pipe 11 is provided on one side of the cooling pool 10, and a drain pipe 12 is provided on the other side of the cooling pool 10. A water pump 13 is provided on one side of both the water inlet pipe 11 and the drain pipe 12.

[0070] The adjusting device 6 includes a fixing block 61, a second driving member 62, and a threaded screw 63. The fixing block 61 is fixedly installed on one side of the top of the fixing arm 5, the second driving member 62 is fixedly installed on one side of the outer surface of the fixing block 61, and the threaded screw 63 is fixedly connected to one end of the output shaft of the second driving member 62.

[0071] The moving device 7 includes a moving arm 71, a sleeve groove 72, a moving block 73, and a first threaded hole 74. The moving arm 71 is sleeved on one side of the outer surface of the fixed arm 5. The sleeve groove 72 is opened in the middle of one side of the outer surface of the moving arm 71. The moving block 72 is fixedly installed on the top side of the moving arm 71. The first threaded hole 74 is opened in the middle of one side of the outer surface of the moving block 72.

[0072] The mounting plate 8 includes a mounting plate 81, a sliding groove 82, a fixing bracket 83, a third driving component 84, and a threaded post 85. The mounting plate 81 is fixedly mounted on one side of the outer surface of the moving arm 71. Four sliding grooves 82 are equidistantly formed around one side of the surface of the mounting plate 81. Four fixing brackets 83 are equidistantly fixedly mounted around the outer surface of the mounting plate 81. The third driving component 84 is fixedly mounted on one side of the outer surface of the fixing bracket 83. The threaded post 85 is fixedly connected to the end of the output shaft of the third driving component 84.

[0073] The clamping device 9 includes a slider 91, a second threaded hole 92, and a clamping plate 93. The slider 91 is slidably installed on one side inside the slide groove 82, the second threaded hole 92 is opened on one side of the outer surface of the slider 91, and the clamping plate 93 is fixedly installed on one side of the outer surface of the slider 91.

[0074] The slider 91 is threaded to the outer surface of the threaded post 85 through the second threaded hole 92.

[0075] The lifting component 2 adopts an electric telescopic cylinder device, and the first driving component 4, the second driving component 62 and the third driving component 84 all adopt servo motor devices.

[0076] The movable block 73 is threadedly engaged with the outer surface of the threaded screw 63 through the first threaded hole 74.

[0077] The working principle of the solution heat treatment method for ER2209 welding duplex steel wire rod provided by this invention is as follows:

[0078] During operation, the output shaft of the second drive unit 62 rotates, driving the threaded screw 63 to rotate. The threaded screw 63 rotates and engages the first threaded hole 74 of the threaded moving block 73. The engaging moving block 73 drives the moving arm 71 to slide on the surface of the fixed arm 5, so that the moving arm 71 drives the mounting plate 8 and the clamping device 9 to extend into the heat treatment equipment. The output shafts of the four third drive units 84 rotate, driving the threaded column 85 to rotate. The threaded column 85 rotates and engages the threaded slider 91, so that the four clamping plates 93 move closer to each other to clamp the heat-treated coil.

[0079] The output shaft of the second drive member 62 rotates in the opposite direction, causing the threaded screw 63 to rotate in the opposite direction. The threaded engagement moving block 73 drives the moving arm 71 to move in the opposite direction, so that the clamping device 9 clamps the coil and disengages it from the heat treatment equipment. Then, the output shaft of the first drive member 4 rotates, causing the mounting plate 8 and the clamping device 9 to rotate to the top of the cooling pool 10. Then, the output shaft of the lifting member 2 moves downward, and the control fixed arm 5 drives the mounting plate 8 and the clamping device 9 to move downward to reduce the height.

[0080] Then the output shaft of the third drive unit 84 rotates in the opposite direction, and the engaging clamp 93 moves, causing the four clamps 93 to loosen the coil, so that the coil falls into the cooling pool 10 for cooling and temperature reduction, and the parts are automatically picked up without manual transfer.

[0081] Compared with related technologies, the solution heat treatment method for ER2209 welding duplex steel wire rod provided by the present invention has the following beneficial effects:

[0082] This invention provides a solution heat treatment method for ER2209 welding duplex steel wire rod. A transfer device allows for rapid transfer of the coil from the heat treatment furnace to the cooling water tank after solution heat treatment, meeting the requirements for rapid cooling and preventing the coil from remaining in the sensitive temperature range for σ-phase precipitation for an extended period during transfer. This further reduces the risk of σ-phase precipitation and embrittlement from a process operation perspective. The transfer device can automatically complete the clamping, transfer, and placement of the coil without manual intervention, reducing the safety risks of manual high-temperature operations and ensuring the stability and controllability of the transfer time. This improves the repeatability and reliability of the overall solution treatment process, making it suitable for industrial mass production.

[0083] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A solution heat treatment method of a ER2209 welding dual-phase steel wire rod, characterized by, Includes the following steps: S1: Loading the furnace; Place the welding duplex steel wire rods in the heat treatment furnace in coil or straight form, ensuring that there are gaps between the wire rods to avoid them being too tightly attached to each other and affecting the uniformity of heating; S2: Heating; The furnace temperature is raised to the solution treatment temperature of 1050 to 1100°C at a heating rate of 10 to 30°C / min, and the atmosphere inside the furnace is air during the heating process; S3: Heat preservation; heat preservation at the solution treatment temperature for 60, 90, and 120 min, and establish a control group to explore the optimal solution preservation time; S4: Rapid cooling; After the heat treatment is completed, the wire rod is quickly removed from the heat treatment furnace and cooled to room temperature in water within 15 seconds. S5: Post-processing; after cooling, the wire rod is pickled to remove the oxide scale and obtain the finished product, solid solution acid white wire rod.

2. The solution heat treatment method of ER2209 welding dual-phase steel wire rod according to claim 1, characterized in that, The solution treatment temperature in S2 is preferably 1050 to 1100°C.

3. The solution heat treatment method of ER2209 welding dual-phase steel wire rod according to claim 1, characterized in that, The temperature of the cooling medium in S4 is controlled between 15 and 30°C, and the cooling medium is kept circulating during the cooling process to ensure uniform cooling.

4. The solution heat treatment method of ER2209 welding dual-phase steel wire rod according to claim 1, characterized in that, In step S4 of the solution heat treatment method for the ER2209 welding duplex steel wire rod, a transfer device is required during the removal process. The transfer device includes a base. A lifting component is fixedly installed on one side of the top of the base. A first driving component is fixedly connected to the top end of the output shaft of the lifting component. A fixed arm is fixedly connected to the top end of the output shaft of the first driving component. An adjustment device is fixedly installed on one side of the top of the fixed arm. A mobile device is slidably mounted on one side of the outer surface of the fixed arm. A mounting plate is fixedly connected to one side of the mobile device, and clamping devices are provided around one side of the surface of the mounting plate.

5. The solution heat treatment method for ER2209 welding duplex steel wire rod according to claim 4, characterized in that, A cooling pool is fixedly installed on the other side of the top of the base. A water inlet pipe is provided on one side of the cooling pool, and a drain pipe is provided on the other side of the cooling pool. A water pump is provided on one side of both the water inlet pipe and the drain pipe.

6. The solution heat treatment method for ER2209 welding duplex steel wire rod according to claim 4, characterized in that, The adjusting device includes a fixed block, a second driving member, and a threaded screw. The fixed block is fixedly installed on one side of the top of the fixed arm, the second driving member is fixedly installed on one side of the outer surface of the fixed block, and the threaded screw is fixedly connected to one end of the output shaft of the second driving member.

7. The solution heat treatment method for ER2209 welding duplex steel wire rod according to claim 4, characterized in that, The moving device includes a moving arm, a sleeve groove, a moving block, and a first threaded hole. The moving arm is sleeved on one side of the outer surface of the fixed arm. The sleeve groove is opened in the middle of one side of the outer surface of the moving arm. The moving block is fixedly installed on the top side of the moving arm. The first threaded hole is opened in the middle of one side of the outer surface of the moving block.

8. The solution heat treatment method for ER2209 welding duplex steel wire rod according to claim 7, characterized in that, The mounting plate includes a mounting plate, sliding grooves, a fixing bracket, a third drive component, and a threaded post. The mounting plate is fixedly mounted on one side of the outer surface of the moving arm. The four sliding grooves are equidistantly opened around one side of the surface of the mounting plate. The four fixing brackets are equidistantly fixedly mounted around the outer surface of the mounting plate. The third drive component is fixedly mounted on one side of the outer surface of the fixing bracket. The threaded post is fixedly connected to the end of the output shaft of the third drive component.

9. The solution heat treatment method for ER2209 welding duplex steel wire rod according to claim 8, characterized in that, The clamping device includes a slider, a second threaded hole, and a clamping plate. The slider is slidably installed on one side inside the groove, the second threaded hole is opened on one side of the outer surface of the slider, and the clamping plate is fixedly installed on one side of the outer surface of the slider.

10. The solution heat treatment method for ER2209 welding duplex steel wire rod according to claim 9, characterized in that, The slider is threadedly connected to the outer surface of the threaded post through the second threaded hole.

Images