N04400 nickel-copper alloy hot continuous rolling plate coil and acid pickling surface treatment process

Abstract

The invention discloses an N04400 nickel-copper alloy hot continuous rolling plate coil and an acid pickling surface treatment technology. The technology comprises the following specific steps that (1) a steel billet is prepared and put into a heating furnace to be heated; 2) descaling with high-pressure water; (3) rough rolling is conducted, specifically, the heated steel billet is conveyed to a rough rolling machine through a conveying roller; 4) finish rolling: conveying into a finish rolling mechanism, wherein the finish rolling adopts accelerated rolling; 5) coiling: after finish rolling, feeding into a coiling mechanism for coiling; (6) uncoiling and welding; (7) annealing is conducted, specifically, the nickel-copper alloy hot-rolled plate is subjected to annealing treatment through an annealing mechanism, and then cooling is conducted; (8) phosphorus breaking and shot blasting; the annealed nickel-copper alloy hot-rolled plate is subjected to shot blasting treatment through a shot blasting machine; (9) acid pickling is conducted, specifically, the nickel-copper alloy hot-rolled plate is subjected to acid pickling through an acid pickling mechanism to remove oxide skin; and 10) cleaning and drying. Acid liquor mixed with oxide skin and other impurities on the upper surface layer of the hot-rolled plate can be transferred in the pickling process section, and a large amount of acid liquor is prevented from being deposited on the surface layer of the hot-rolled plate.

Description

Technical Field

[0001] This invention belongs to the field of hot rolling technology of nickel-copper alloys, and specifically relates to a hot continuous rolling coil of N04400 nickel-copper alloy and a pickling surface treatment process. Background Technology

[0002] Nickel-copper alloys possess numerous superior properties, exhibiting exceptional corrosion resistance. They are resistant to corrosion in seawater, chemical solvents, ammonia, sulfur, chlorine, hydrogen chloride, and various acidic media (sulfuric acid, hydrofluoric acid, hydrochloric acid, phosphoric acid, and organic acids), alkaline media, salts, and molten salts. They demonstrate excellent corrosion resistance in fluorine, hydrochloric acid, sulfuric acid, and their derivatives, and are even more corrosion-resistant than copper-based alloys in seawater. Therefore, they are widely used in numerous fields, including petrochemicals for manufacturing heat exchange equipment, boiler feedwater heaters, oil and chemical pipelines, and containers; marine development for seawater exchangers and evaporators, as well as pump shafts and propellers for deep-sea equipment; and aerospace for their high strength and high-temperature resistance, used in aircraft and related equipment.

[0003] With the continuous development of China's economy and the rapid growth of related industries, the demand for nickel-copper alloys continues to increase. For example, the development of the new energy vehicle industry has led to a continuous increase in the demand for high-performance corrosion-resistant materials. The application of nickel-copper alloys in batteries, electric vehicles and alloy materials is also gradually expanding. The rapid development of 5G communication and other fields has led to a continuous increase in the demand for nickel-copper alloys.

[0004] The density of the nickel-copper alloy NO4400 is 8.80 g / cm³. 3With a thermal conductivity of 21.8 W / mK and a melting point of 1300-1350℃, it is widely used in nickel-copper alloys. Therefore, our company decided to conduct research and development on the production of N04400 nickel-copper alloy hot-rolled plates. During the research and development process, we found that the pickling process was too time-consuming, and that in conventional pickling methods, oxide impurities accumulated and deposited on the surface of the hot-rolled plate during the pickling process. When the hot-rolled plate leaves the pickling tank, some of these surface impurities are carried away, although the amount carried away is small, which still increases the processing burden of the next process and may cause surface quality problems. To address this issue, our company has conducted prior research on other products and provided a solution, as detailed in the CN217324327U announcement number for an ultra-wide strip stainless steel pickling production line. The patented technology demonstrates the application of this technology by using a tossing mechanism to quickly move the acid containing oxide slag impurities around the brush roller away from the surface of the hot-rolled plate. However, in this technology, it is found that although the tossing mechanism can move the acid around itself away, it cannot quickly remove the oxide slag to one side of the hot-rolled plate, leaving it above the hot-rolled plate. The acid sinks again after moving away from or past the tossing mechanism. At the same time, due to the structural characteristics of the tossing mechanism itself, a slight backflow phenomenon occurs on the top of the hot-rolled plate, especially the acid on the upper surface of the hot-rolled plate. Therefore, based on this phenomenon and problem, in the pickling section of this invention N04400, a solution is provided that can specifically transfer a portion of the acid containing mixed impurities to one side of the hot-rolled plate, reducing the amount of oxide slag remaining on the upper surface of the hot-rolled plate. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a hot-rolled N04400 nickel-copper alloy coil and a pickling surface treatment process, which can transfer the acid solution containing mixed oxide scale and other impurities on the surface of the hot-rolled plate during the pickling process, thus avoiding a large amount of deposition on the surface of the hot-rolled plate.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A hot-rolled N04400 nickel-copper alloy coil and pickling surface treatment process, the specific steps of which are as follows:

[0008] 1) Prepare the steel billet for heating in the heating furnace. The heating process is divided into three stages: heating stage 1, heating stage 2, and soaking stage. Heating stage 1 involves heating at a temperature of 1270-1280℃ for 45-65 minutes. After heating stage 1, heating stage 2 is started at a temperature of 1290-1330℃ for 60-75 minutes. After heating stage 2, heating stage 2 is started at a temperature of 1050-1110℃ for 40-55 minutes. The total heating time is 145-195 minutes.

[0009] 2) High-pressure water descaling: The oxide scale on the surface of the heated steel billet is removed by a high-pressure water jetting mechanism;

[0010] 3) Rough rolling: The heated steel billet is conveyed to the rough rolling mill via conveyor rollers, and the conveyor device is equipped with a corresponding heat preservation cover;

[0011] 4) Finishing rolling: After being conveyed, the material enters the finishing rolling mechanism. The finishing rolling adopts speed-increasing rolling. The starting temperature of finishing rolling is set to 1040-1060℃; the finishing rolling ending temperature is >950℃.

[0012] The steel billet is rolled in 8 passes during finishing rolling; the reduction rate for the first pass is 22.0-22.5%; the reduction rate for the second pass is 24.0-24.5%; the reduction rate for the third pass is 24.5-25%; the reduction rate for the fourth pass is 23.5-24%; the reduction rate for the fifth pass is 21-21.5%; the reduction rate for the sixth pass is 16.5-17%; the reduction rate for the seventh pass is 15.0-15.5%; and the reduction rate for the eighth pass is 13.0-13.5%.

[0013] 5) Winding: After precision rolling, the rolls are fed into the winding mechanism for winding.

[0014] 6) Uncoiling and welding: The adjacent sets of nickel-copper alloy hot-rolled plates are welded and fixed by a welding mechanism to facilitate the overall pickling of the nickel-copper alloy hot-rolled plates.

[0015] 7) Annealing: The nickel-copper alloy hot-rolled plate is annealed by an annealing machine and then cooled;

[0016] 8) Shot blasting to break phosphorus; annealed nickel-copper alloy hot-rolled plates are shot blasted using a shot blasting machine.

[0017] 9) Pickling: The nickel-copper alloy hot-rolled plate is pickled to remove oxide scale by a pickling unit; the pickling process consists of a first stage of mixed acid pickling and a second stage of mixed acid pickling; the first stage of mixed acid pickling has an HNO3 concentration of 75-85 g / L, an HF concentration of 30-40 g / L, a metal ion concentration of <40 g / L, and a temperature of 50-60℃; the second stage of mixed acid pickling has an HNO3 concentration of 65-70 g / L, an HF concentration of 30-35 g / L, a metal ion concentration of 25-35 g / L, and a temperature of 50-55℃;

[0018] 10) Cleaning and drying: The hot-rolled nickel-copper alloy plate is cleaned by the cleaning unit, and then dried by the drying system before being rolled.

[0019] Step 9) The pickling mechanism includes a pickling tank, which contains a reversing roller to guide the hot-rolled plate to change direction. A first mounting groove is provided on the side wall of the pickling tank, containing a fixedly mounted encapsulation block. The pickling tank also contains a first brushing roller, a second brushing roller, and a mounting frame. The first brushing roller is positioned above the second brushing roller. The mounting frame is fixedly connected to the side wall of the pickling tank at both ends. The first brushing roller is rotatably connected to the mounting frame and the encapsulation block at both ends. The second brushing roller is rotatably connected to the side wall of the pickling tank at both ends. The hot-rolled plate is transferred between the first and second brushing rollers. The rotation of the first and second brushing rollers brushes the surface of the hot-rolled plate, assisting the acid solution in cleaning the oxide slag. A first motor is provided on the side wall of the pickling tank. The first motor shaft has a sprocket, and the second brushing roller is driven to rotate by transmitting power through a chain. A sealing groove is provided on the inner wall of the first mounting groove for filling and installing a sealing gasket, after which the encapsulation block is installed. A second mounting plate with bolt holes is provided on the outer wall of the first mounting groove.

[0020] The encapsulation block includes a pair of mounting boxes fixedly connected by bolts. A movable block is provided inside the mounting box, and a second mounting groove is provided inside the movable block. A spring is provided in the second mounting groove, and the spring pushes the mounting box so that the movable block can move up and down within the mounting box. Furthermore, a sealing strip is provided on the side wall of the movable block, which can achieve a sealing effect during the up and down movement of the movable block to prevent acid leakage. The top of the mounting box is provided with a first mounting plate and bolt holes. The encapsulation block is fixed by locking the first mounting plate and the second mounting plate together with bolts.

[0021] The mounting frame includes an electric actuator, a support plate, a mounting plate, a mounting frame, a second motor, and a third motor. The support plate is fixedly connected to the top of the side wall of the pickling tank. The mounting plate is located inside the pickling tank. The mounting plate has a guide shaft that is slidably connected to the support plate. The electric actuator is fixed to the support plate. The top shaft of the electric actuator passes through the support plate and is fixedly connected to the mounting plate. The mounting plate has mounting arms at both ends. The mounting arms are rotatably connected to the two ends of the first brushing roller. The mounting plate also has U-shaped frames at both ends. The U-shaped frames are fixedly connected to the mounting frame. There is a pair of mounting frames, which are respectively located on both sides of the pickling tank. The second motor is located on one side of the mounting frame, and the third motor is located on the other side of the mounting frame.

[0022] The first scrubbing roller includes a first sleeve, a second sleeve, and a third sleeve. The third sleeve is equipped with a control component. The first sleeve is sleeved on the second sleeve, and the second sleeve is sleeved on the third sleeve.

[0023] The first sleeve has a first through groove at one end and a first sealing plate fixed with bolts at the other end. The first sealing plate and one end of the first sleeve have a fixed first rotating shaft. The first rotating shaft is rotatably connected to the mounting arm. The first rotating shaft passes through the moving block and is rotatably connected to it. At the same time, the first rotating shaft is also rotatably connected to the mounting frame. The first rotating shaft is hollow. The first rotating shaft has a sprocket and is connected to the second motor by transmitting power through a chain. Furthermore, the first sleeve also has several interval grooves and a brushing part. The brushing part is spaced apart from the interval grooves. Furthermore, a hook plate is provided on one side of the brushing part to hook the water flow upward.

[0024] The second sleeve is fixedly connected to the third sleeve; one end of the third sleeve is provided with a fixed second sealing plate, and the second sealing plate is provided with a fixed second rotating shaft. The second rotating shaft is hollow. The third sleeve is also provided with an arc-shaped cover plate that is rotatably connected. The cover plate and the third sleeve can form a complete circular cylinder wall. The third sleeve is provided with auger blades and a matching third rotating shaft. The third rotating shaft on the auger blades is inserted into the second rotating shaft. One end of the third rotating shaft is provided with a sprocket and is connected to a third motor by transmitting power through a chain.

[0025] The control assembly includes a fixed frame, a first adjusting arm, a support, an L-shaped support plate, and a second adjusting arm. The fixed frame is fixed to the cover plate, and the support and the L-shaped support plate are fixed to the third sleeve. The first adjusting arm is hinged to the support, and one end of the first adjusting arm is provided with an adjusting shaft located inside the fixed frame. One end of the first adjusting arm is provided with an adjusting groove. The second adjusting arm is hinged to the L-shaped support plate, and one end of the second adjusting arm is also provided with an adjusting shaft located inside the adjusting groove. One end of the second adjusting arm is provided with an adjusting block. The adjusting block protrudes from the side wall of the second sleeve.

[0026] The cover plate is provided with a fixed spring plate, which pushes against the inner wall of the first sleeve.

[0027] The second sleeve has an opening on its side wall, and support shafts and bolt holes at both ends. The support shafts assist the second sleeve in quickly inserting into the second sealing plate, which is then fixed with bolts. The other end of the second sleeve has a third sealing plate, which is inserted into the support shaft and fixed with bolts. The third sealing plate and the second sealing plate together form a closed cylinder at both ends of the second sleeve. The third sealing plate has a second through groove and a second rotating shaft. Furthermore, a fixed limiting sleeve is provided on the second rotating shaft. During installation, the second and third sleeves are first inserted into the first sleeve, and the second rotating shaft is inserted into the hollow first rotating shaft. Then, the first sealing plate is installed, and the first rotating shaft is sleeved onto the second rotating shaft. The limiting sleeve provides a limiting effect. The second rotating shaft has keyways and matching key blocks at both ends. The mounting frame also has keyways. The keyways and key blocks work together to form a spline connection between the second rotating shaft and the mounting frame, preventing the second rotating shaft and the second sleeve from rotating and facilitating installation. This keeps the opening on the second sleeve in a fixed position, allowing the acid solution after washing to enter the opening to the maximum extent.

[0028] The advantages of this invention compared to existing technologies are as follows:

[0029] The application of the first washing roller can not only clean the surface of the hot-rolled plate and assist in the treatment of oxide slag, but also partially transfer the acid solution of the mixed oxide slag, avoiding the disadvantages of accumulation near the first washing roller and on the upper surface of the hot-rolled plate, as well as the disadvantages of scratches caused by friction between the first washing roller and the hot-rolled plate surface when the accumulation is large and the first washing roller rotates.

[0030] Furthermore, when the first sleeve rotates, it brushes the surface of the hot-rolled plate through the washing section. At the same time, because the set interval groove can coincide with the opening on the second sleeve during the rotation of the first sleeve, it forms a continuous channel for acid to enter the second sleeve. It can also realize the intermittent pushing of the adjusting block in the control component by the inner wall of the first sleeve. Thus, with the cooperation of the spring plate, the cover plate can be opened and closed intermittently to complete the filling of acid in the third sleeve. During the continuous rotation of the auger blade, it can ensure that the acid in the third sleeve is quickly discharged and transferred to the side of the hot-rolled plate during the process of the cover plate resetting and closing the third sleeve, so as to realize the transfer of acid mixed with impurities.

[0031] During this process, the electric actuator can also control the up and down movement of the first brush roller to adapt to the requirements of hot-rolled plates of different thicknesses, and at the same time, it can prevent leakage of the pickling tank when the encapsulation block is used. Attached Figure Description

[0032] Appendix Figure 1 This is a schematic diagram of the pickling mechanism in the hot-rolled coil and pickling surface treatment process of N04400 nickel-copper alloy according to the present invention. Figure 1 ;

[0033] Appendix Figure 2 This is a schematic diagram of the pickling mechanism in the hot-rolled coil and pickling surface treatment process of N04400 nickel-copper alloy according to the present invention. Figure 2 ;

[0034] Appendix Figure 3 This is a structural diagram of the mounting bracket. Figure 1 ;

[0035] Appendix Figure 4 This is a structural diagram of the mounting bracket. Figure 2 ;

[0036] Appendix Figure 5 This is a schematic diagram of the encapsulation block structure. Figure 1 ;

[0037] Appendix Figure 6 This is a schematic diagram of the encapsulation block structure. Figure 2 ;

[0038] Appendix Figure 7 This is a schematic diagram of the encapsulation block structure. Figure 3 ;

[0039] Appendix Figure 8 This is a schematic diagram of the pickling tank.

[0040] Appendix Figure 9 This is a schematic diagram of the structure of the first scrubbing roller. Figure 1 ;

[0041] Appendix Figure 10 This is a schematic diagram of the structure of the first scrubbing roller. Figure 2 ;

[0042] Appendix Figure 11 This is a schematic diagram of the second sleeve;

[0043] Appendix Figure 12 This is a schematic diagram of the first sleeve;

[0044] Appendix Figure 13 This is a structural diagram of the second and third sleeves. Figure 1 ;

[0045] Appendix Figure 14 This is a schematic diagram of the cross-sectional structure of the first scrubbing roller;

[0046] Appendix Figure 15 This is a schematic diagram of the control component;

[0047] Appendix Figure 16 This is a structural diagram of the second and third sleeves. Figure 2 ;

[0048] In the diagram: 1. Pickling tank; 11. Reversing roller; 12. First mounting groove; 121. Sealing groove; 122. Second mounting plate; 2. Mounting frame; 3. First brushing roller; 4. Second brushing roller; 41. First motor; 8. Spring sheet; 9. Hot-rolled plate;

[0049] 21. Electric actuator; 22. Support plate; 23. Mounting plate; 231. Mounting arm; 232. U-shaped frame; 233. Guide shaft; 24. Mounting frame; 25. Second motor; 26. Third motor;

[0050] 5. Encapsulation block; 51. Mounting box; 511. First mounting plate; 52. Moving block; 521. Second mounting groove; 53. Spring; 54. Sealing strip;

[0051] 61. First sleeve; 611. First through groove; 612. First rotating shaft; 613. First sealing plate; 614. Spacing groove; 615. Brushing section; 6151. Hook plate;

[0052] 62. Second sleeve; 621. Opening; 622. Support shaft;

[0053] 63. Third sleeve; 631. Second sealing plate; 632. Second rotating shaft; 633. Third sealing plate; 634. Limiting sleeve; 635. Second through groove; 636. Cover plate; 637. Screwdriver blade; 6371. Third rotating shaft;

[0054] 7. Control components; 71. Fixed frame; 72. First adjusting arm; 722. Adjusting shaft; 721. Adjusting groove; 73. Support; 74. L-shaped support plate; 75. Second adjusting arm; 751. Adjusting block. Detailed Implementation

[0055] To facilitate understanding by those skilled in the art, the following is a detailed explanation in conjunction with the appendix. Figure 1-16 The technical solution of the present invention will be further described in detail below.

[0056] Example 1:

[0057] A hot-rolled N04400 nickel-copper alloy coil and pickling surface treatment process, the specific steps of which are as follows:

[0058] 1) Prepare the steel billet for heating in the heating furnace. The heating steps are divided into three stages: heating stage 1, heating stage 2, and soaking stage. Heating stage 1 is heated at 1270℃ for 45 minutes. After heating stage 1, heating stage 2 is heated at 1290℃ for 60 minutes. After heating stage 2, heating stage 2 is heated at 1050℃ for 40 minutes. The total heating time is 145 minutes.

[0059] 2) High-pressure water descaling: The oxide scale on the surface of the heated steel billet is removed by a high-pressure water jetting mechanism.

[0060] 3) Rough rolling: The heated steel billet is conveyed to the rough rolling mill via conveyor rollers, and the conveyor device is equipped with a corresponding heat preservation cover;

[0061] 4) Finishing rolling: After being conveyed, the material enters the finishing rolling mechanism. The finishing rolling adopts speed-increasing rolling. The starting temperature of finishing rolling is set at 1045℃; the finishing rolling ending temperature is 960℃.

[0062] The steel billet is rolled in 8 passes during finishing rolling; the reduction rate for the first pass is 22.1%; the reduction rate for the second pass is 24.25%; the reduction rate for the third pass is 24.55%; the reduction rate for the fourth pass is 23.62%; the reduction rate for the fifth pass is 21.27%; the reduction rate for the sixth pass is 16.55%; the reduction rate for the seventh pass is 15.22%; and the reduction rate for the eighth pass is 13.15%.

[0063] 5) Winding: After precision rolling, the rolls are fed into the winding mechanism for winding.

[0064] 6) Uncoiling and welding: The adjacent sets of nickel-copper alloy hot-rolled plates are welded and fixed by a welding mechanism to facilitate the overall pickling of the nickel-copper alloy hot-rolled plates.

[0065] 7) Annealing: The nickel-copper alloy hot-rolled plate is annealed by an annealing machine and then cooled;

[0066] 8) Shot blasting to break phosphorus; annealed nickel-copper alloy hot-rolled plates are shot blasted using a shot blasting machine.

[0067] 9) Pickling: The nickel-copper alloy hot-rolled plate is pickled to remove oxide scale by a pickling unit; the pickling process is divided into a first stage of mixed acid pickling and a second stage of mixed acid pickling; the first stage of mixed acid pickling has an HNO3 concentration of 77 g / L, an HF concentration of 32 g / L, a metal ion concentration of 38 g / L, and a temperature of 52℃; the second stage of mixed acid pickling has an HNO3 concentration of 66 g / L, an HF concentration of 31 g / L, a metal ion concentration of 26 g / L, and a temperature of 52℃.

[0068] The pickling mechanism includes a pickling tank 1, within which a deflecting roller 11 guides the hot-rolled plate 9 to change direction. A first mounting groove 12 is provided on the side wall of the pickling tank 1, containing a fixedly mounted encapsulating block 5. The pickling tank 1 also includes a first washing roller 3, a second washing roller 4, and a mounting frame 2. The first washing roller 3 is positioned above the second washing roller 4. The mounting frame 2 is fixedly connected to the side wall of the pickling tank 1 at both ends. The first washing roller 3 is rotatably connected to the mounting frame 2 and the encapsulating block 5 at both ends. The second washing roller 4 is rotatably connected to the side wall of the pickling tank 1 at both ends. The hot-rolled plate 9... The material is transferred between the first washing roller 3 and the second washing roller 4. The rotation of the first washing roller 3 and the second washing roller 4 assists in cleaning the surface of the hot-rolled plate 9 with acid solution to remove oxide residue. The side wall of the pickling tank 1 is equipped with a first motor 41. The shaft end of the first motor 41 is equipped with a sprocket, and the second washing roller 4 is driven to rotate by transmitting power through a chain. The inner wall of the first mounting groove 12 is equipped with a sealing groove 121 for filling and installing a sealing gasket, and then installing the encapsulation block 5. The outer wall of the first mounting groove 12 is equipped with a second mounting plate 122 and bolt holes.

[0069] The encapsulation block 5 includes a pair of mounting boxes 51 fixedly connected by bolts. A movable block 52 is provided inside the mounting box 51. A second mounting groove 521 is provided inside the movable block 52. A spring 53 is provided inside the second mounting groove 521. The spring 53 pushes the mounting box 51 so that the movable block 52 can move up and down inside the mounting box 51. Furthermore, a sealing strip 54 is provided on the side wall of the movable block 52, which can achieve a sealing effect during the up and down movement of the movable block 52 to prevent acid leakage. A first mounting plate 511 is provided at the top of the mounting box 51 and bolt holes are provided. The encapsulation block 5 is fixed by locking the first mounting plate 511 and the second mounting plate 122 with bolts.

[0070] The mounting frame 2 includes an electric push rod 21, a support plate 22, a mounting plate 23, a mounting frame 24, a second motor 25, and a third motor 26. The support plate 22 is fixedly connected to the top of the side wall of the pickling tank 1. The mounting plate 23 is located inside the pickling tank 1. The mounting plate 23 is provided with a guide shaft 233 and is slidably connected to the support plate 22. The electric push rod 21 is fixed on the support plate 22. The top shaft of the electric push rod 21 passes through the support plate 22 and is fixedly connected to the mounting plate 23. The mounting plate 23 is provided with mounting arms 231 at both ends. The mounting arms 231 are rotatably connected to the two ends of the first brushing roller 3. The mounting plate 23 is also provided with U-shaped frames 232 at both ends. The U-shaped frames 232 are fixedly connected to the mounting frame 24. The mounting frame 24 is provided with a pair and is respectively located on both sides of the pickling tank 1. The second motor 25 is located on one side of the mounting frame 24, and the third motor 26 is located on the other side of the mounting frame 24.

[0071] The first brushing roller 3 includes a first sleeve 61, a second sleeve 62, and a third sleeve 63. The third sleeve 63 is provided with a control component 7. The first sleeve 61 is sleeved on the second sleeve 62, and the second sleeve 62 is sleeved on the third sleeve 63.

[0072] The first sleeve 61 has a first through groove 611 at one end and a first sealing plate 613 fixed with bolts at the other end. The first sealing plate 613 and the first sleeve 61 have a first rotating shaft 612 fixedly installed at one end. The first rotating shaft 612 is rotatably connected to the mounting arm 231. The first rotating shaft 612 passes through the moving block 52 and is rotatably connected to each other. At the same time, the first rotating shaft 612 is also rotatably connected to the mounting frame 24. The first rotating shaft 612 is hollow. The first rotating shaft 612 is equipped with a sprocket and is connected to the second motor 25 by transmitting power through a chain. Furthermore, the first sleeve 61 is also equipped with several interval grooves 614 and a brushing part 615. The brushing part 615 is spaced apart from the interval grooves 614. Furthermore, a hook plate 6151 is provided on one side of the brushing part 615 to hook the water flow upward.

[0073] The second sleeve 62 is fixedly connected to the third sleeve 63; one end of the third sleeve 63 is provided with a fixed second sealing plate 631, and the second sealing plate 631 is provided with a fixed second rotating shaft 632, which is hollow; the third sleeve 63 is also provided with an arc-shaped cover plate 636 that is rotatably connected, and the cover plate 636 and the third sleeve 63 can form a complete circular cylinder wall; the third sleeve 63 is provided with an auger blade 637 and a matching third rotating shaft 6371 inside; the third rotating shaft 6371 on the auger blade 637 is inserted into the second rotating shaft 632; one end of the third rotating shaft 6371 is provided with a sprocket and is connected to the third motor 26 by transmitting power through a chain.

[0074] The control component 7 includes a fixed frame 71, a first adjusting arm 72, a support 73, an L-shaped support plate 74, and a second adjusting arm 75. The fixed frame 71 is fixed on the cover plate 636, and the support 73 and the L-shaped support plate 74 are fixed on the third sleeve 63. The first adjusting arm 72 is hinged to the support 73. One end of the first adjusting arm 72 is provided with an adjusting shaft 722, which is located inside the fixed frame 71. One end of the first adjusting arm 72 is provided with an adjusting groove 721. The second adjusting arm 75 is hinged to the L-shaped support plate 74. One end of the second adjusting arm 75 is also provided with an adjusting shaft and located inside the adjusting groove 721. One end of the second adjusting arm 75 is provided with an adjusting block 751. The adjusting block 751 protrudes from the side wall of the second sleeve 62.

[0075] The cover plate 636 is provided with a fixed spring plate 8, which pushes against the inner wall of the first sleeve 61.

[0076] The second sleeve 62 has an opening 621 on its side wall. Both ends of the second sleeve 62 have support shafts 622 and bolt holes. The support shafts 622 assist the second sleeve 62 in quickly inserting into the second sealing plate 631, which is then bolted in place. The other end of the second sleeve 62 has a third sealing plate 633, which is inserted into the support shaft 622 and bolted in place. The third sealing plate 633 and the second sealing plate 631 form a closed-end cylinder. The third sealing plate 633 has a second through groove 635 and a second rotating shaft 632. Furthermore, the second rotating shaft 632 has a fixedly installed limiting sleeve 634. During installation, the second sleeve 62 and the third sleeve 631 are first assembled. 3. Then, insert the first sleeve 61, insert the second rotating shaft 632 into the hollow first rotating shaft 612, and then install the first sealing plate 613. The first rotating shaft 612 is sleeved onto the second rotating shaft 632. The limiting sleeve 634 achieves the limiting effect. The second rotating shaft 632 has keyways and key blocks for cooperation at both ends. The mounting frame 24 also has keyways. Then, through the cooperation of the keyways and key blocks, the second rotating shaft 632 and the mounting frame 24 form a spline structure connection, which prevents the second rotating shaft 632 and the second sleeve 62 from rotating and facilitates installation. The opening 621 on the second sleeve 62 remains in a fixed position, so that the acid solution after brushing can enter along the opening 621 to the maximum extent.

[0077] Applications in the pickling process:

[0078] First, the electric actuator 21 can drive and control the mounting plate 23 to move up and down, thereby controlling the first washing roller 3 to move up and down, so that the distance between the first washing roller 3 and the second washing roller 4 can be adapted to the thickness of the hot-rolled plate 9. During the up and down movement of the first washing roller 3, the U-shaped frame 232 drives the mounting frame 24 to move synchronously, and the moving block 52 in the encapsulation block 5 moves within the mounting box 51 to achieve sealing and prevent leakage.

[0079] The first sleeve 61 in the first washing roller 3 is driven to rotate by the second motor 25. It washes the surface of the hot-rolled plate 9 through the washing section 615. During the rotation, the acid solution mixed with impurities after being washed by the washing section 615 flows through the opening 621 of the second sleeve 62. Therefore, when a negative pressure occurs inside the second sleeve 62, it will automatically draw in the acid solution near the opening 621. The negative pressure inside the second sleeve 62 is generated according to the discharge of acid solution in the third sleeve 63. Further, the generation of negative pressure in the third sleeve 63 is as follows: the inner wall of the first sleeve 61 will intermittently push the adjusting block 751 in the control component 7 due to the setting of the interval groove 614. By pushing the adjusting block 751, one end of the second adjusting arm 75 is pressed down, which in turn presses one end of the first adjusting arm 72 down, causing the other end to tilt up, thereby adjusting the shaft. 722 moves within the fixed frame 71 to lift the cover plate 636, thereby opening the closed third sleeve 63 and allowing acid filling. After the inner wall of the first sleeve 61 passes the adjusting block 751, in the interval groove 614 section, the cover plate 636 is pushed by the spring plate 8 to reset and close the third sleeve 63. At this time, under the continuous and uninterrupted rotation of the third shaft 6371 driven by the third motor 26 and the auger blade 637, the acid containing impurities in the third sleeve 63 is transferred to one end of the first brushing roller 3 and discharged along the second through groove 635 and the first through groove 611, so that the impurities are away from the upper surface of the hot-rolled plate 9 and avoid accumulation. When the cover plate 636 closes the third sleeve 63, the acid is discharged and transferred. When the cover plate 636 opens, the acid enters the third sleeve 63 along the opening 621 and the cover plate 636, forming a continuous and intermittent transfer of acid and impurities.

[0080] 10) Cleaning and drying: The hot-rolled nickel-copper alloy plate is cleaned by the cleaning unit, and then dried by the drying system before being rolled.

[0081] Example 2: The difference from Example 1 is that:

[0082] Step 1) Prepare the steel billet for heating in the heating furnace. The heating process is divided into three stages: heating stage 1, heating stage 2, and soaking stage. Heating stage 1 is heated at 1275℃ for 60 minutes. After heating stage 1, heating stage 2 is heated at 1325℃ for 70 minutes. After heating stage 2, heating stage 2 is heated at 1105℃ for 50 minutes. The total heating time is 180 minutes.

[0083] Step 4) Finishing rolling: After being conveyed, the material enters the finishing rolling mechanism. The finishing rolling adopts speed-increasing rolling. The starting temperature of finishing rolling is set to 1055℃; the finishing rolling ending temperature is 975℃.

[0084] The steel billet is rolled in 8 passes during finishing rolling; the reduction rate for the first pass is 22.45%; the reduction rate for the second pass is 24.455%; the reduction rate for the third pass is 24.95%; the reduction rate for the fourth pass is 23.88%; the reduction rate for the fifth pass is 21.46%; the reduction rate for the sixth pass is 16.88%; the reduction rate for the seventh pass is 15.48%; and the reduction rate for the eighth pass is 13.46%.

[0085] Step 9) Pickling: The nickel-copper alloy hot-rolled plate is pickled to remove oxide scale by a pickling mechanism; the pickling process consists of a first stage of mixed acid pickling and a second stage of mixed acid pickling; the first stage of mixed acid pickling has an HNO3 concentration of 85 g / L, an HF concentration of 40 g / L, a metal ion concentration of 35.5 g / L, and a temperature of 60℃; the second stage of mixed acid pickling has an HNO3 concentration of 70 g / L, an HF concentration of 35 g / L, a metal ion concentration of 34.8 g / L, and a temperature of 54.5℃.

[0086] Example 3: The difference from Example 1 is that:

[0087] Step 1) Prepare the steel billet for heating in the heating furnace. The heating process is divided into three stages: heating stage 1, heating stage 2, and soaking stage. Heating stage 1 is heated at 1276℃ for 65 minutes. After heating stage 1, heating stage 2 is heated at 1330℃ for 75 minutes. After heating stage 2, heating stage 2 is heated at 1110℃ for 55 minutes. The total heating time is 195 minutes.

[0088] Step 4) Finishing rolling: After being conveyed, the material enters the finishing rolling mechanism. The finishing rolling adopts speed-increasing rolling. The starting temperature of finishing rolling is set to 1060℃; the finishing rolling ending temperature is 996℃.

[0089] The steel billet is rolled in 8 passes during finishing rolling; the reduction rate is 22.5% for the first pass, 24.5% for the second pass, 25% for the third pass, 24% for the fourth pass, 22.5% for the fifth pass, 17% for the sixth pass, 15.5% for the seventh pass, and 13.5% for the eighth pass.

[0090] Step 9) Pickling: The nickel-copper alloy hot-rolled plate is pickled to remove oxide scale by a pickling mechanism; the pickling process consists of a first stage of mixed acid pickling and a second stage of mixed acid pickling; the first stage of mixed acid pickling has an HNO3 concentration of 85 g / L, an HF concentration of 40 g / L, a metal ion concentration of 33.5 g / L, and a temperature of 60℃; the second stage of mixed acid pickling has an HNO3 concentration of 0 g / L, an HF concentration of 35 g / L, a metal ion concentration of 35 g / L, and a temperature of 55℃.

[0091] Test Example 1: The difference from Example 1 is that step 9) does not involve the acid pickling mechanism equipment in this technical solution to assist in cleaning the oxide scale.

[0092] Test Example 2: The difference from Example 2 is that step 9) does not involve the acid pickling mechanism equipment in this technical solution to assist in cleaning the oxide scale.

[0093] Comparative Example 1: The difference from Example 1 is that:

[0094] In step 1), the first heating stage is started, with the temperature controlled at 1220℃ and the heating time at 40 minutes. After the first heating stage is completed, the second heating stage is started, with the temperature controlled at 1250℃ and the heating time at 45 minutes. After the second heating stage is completed, the heat spreader is started, with the temperature controlled at 1000℃ and the heating time at 40 minutes. The total heating time is 125 minutes.

[0095] Comparative Example 2: The difference from Example 2 is that:

[0096] In step 4), the billet is rolled in 6 passes during finishing rolling; the reduction rate of the first pass is 24.6%; the reduction rate of the second pass is 26.5%; the reduction rate of the third pass is 27.85%; the reduction rate of the fourth pass is 25.8%; the reduction rate of the fifth pass is 21.25%; and the reduction rate of the sixth pass is 18.88%.

[0097] Comparative Example 3: The difference between this example and Example 3 is that:

[0098] In step 9), the acid washing process is as follows: in the first stage of mixed acid washing, the concentration of HNO3 is 95 g / L, the concentration of HF is 50 g / L, the concentration of metal ions is 42 g / L, and the temperature is 55℃; in the second stage of mixed acid washing, the concentration of HNO3 is 83 g / L, the concentration of HF is 40 g / L, the concentration of metal ions is 240 g / L, and the temperature is 55℃.

[0099] Comparative Example 4: The sheet material rolled in any of the examples 1-3 was pickled using the pickling process in the pickling method of a hot-rolled ordinary nickel-copper alloy hot-rolled sheet with patent application publication number CN106148973A.

[0100] The mechanical properties and surface quality of the above embodiments were tested according to GB / T2054-2023, and the test results are shown in the table below:

[0101]

[0102] The quality inspection and result analysis of the boards based on the above standards are as follows:

[0103] The mechanical properties of Examples 1-3 are qualified, the surface inspection results are qualified, the surface quality is good, and there are no obvious defects such as scratches, indentations, or pits; the surface of the board is free of cracks and peeling; the board shape is square, and the edges are neat and without curling.

[0104] The mechanical properties of test example 1-2 are qualified, the surface inspection results are qualified, and there are no obvious scratches, indentations, pits or other defects on the plate surface; there are no cracks or peeling on the plate surface, but there are a few dark spots distributed in a dotted pattern, which are considered to be caused by oxide scale deposits on the surface of the hot-rolled plate.

[0105] Comparative Example 1: The difference from the design scheme of this invention is that the rolling temperature is higher than the design standard of this technical scheme. The experimental results show that the mechanical properties are unqualified and the surface quality is unqualified. After inspection and analysis, the high temperature will make the composite oxide scale more dense and cannot be completely removed by conventional pickling methods. Secondly, during the mechanical property test, it was found that the grains were abnormally coarsened and the overall grain boundary area was reduced, which significantly reduced the yield strength.

[0106] Comparative Example 2: The difference from the design scheme of this invention is that the single-pass pressing rate is greatly increased, and the number of passes is relatively reduced. Rolling is carried out on this basis: the experimental results show that the mechanical properties are unqualified and the surface quality is unqualified. After inspection and analysis, the high single-pass pressing rate will lead to increased friction between the roll and the plate, causing the roll to stick to the oxide scale. The adhered oxide scale is pressed into the plate surface, forming pits and inclusions. Secondly, the edge of the plate is subjected to additional tensile stress, and insufficient plasticity will cause serrated cracks. At the same time, during the mechanical property test, it was found that the crystallinity of the grains in the surface layer and the central layer is different, which causes the yield strength to fluctuate and is not uniform.

[0107] Comparative Example 3: The difference from the design scheme of this invention is that the acid concentration is higher than that of the design scheme: its experimental results show that the mechanical properties are qualified, but the values ​​are too low and the surface quality is unqualified; after inspection and analysis, excessive pickling will aggravate the non-uniform dissolution of the metal surface, leading to the corrosion of the substrate and the formation of micro-pits or "over-etching" phenomenon; the hydrofluoric acid in the pickling is highly corrosive to the substrate metal, and excessive use will cause the surface to lose its smoothness. Therefore, excessive acidity will lead to unqualified surface quality.

[0108] Comparative Example 4: The product meets the requirements after testing and analysis.

[0109] Therefore, based on experiments and analysis, it is believed that the design scheme of this invention meets the rolling production requirements of N04400 nickel-copper alloy plates.

[0110] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0111] In summary, the electronic or electrical components, including but not limited to electric actuators and motors, are existing components that are custom-made or purchased. The electrical connections between these components are conventional circuit or electrical connections in the prior art and are not within the scope of protection of this invention.

[0112] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A hot-rolled N04400 nickel-copper alloy coil and a pickling surface treatment process, characterized in that... The specific steps are as follows: 1) Prepare the steel billet for heating in the heating furnace. The heating steps are divided into heating stage 1, heating stage 2, and soaking stage. 2) High-pressure water descaling: The oxide scale on the surface of the heated steel billet is removed by a high-pressure water jetting mechanism; 3) Rough rolling: The heated steel billet is conveyed to the rough rolling mill via conveyor rollers, and the conveyor device is equipped with a corresponding heat preservation cover; 4) Finishing rolling: After being conveyed, the material enters the finishing rolling mechanism. The finishing rolling adopts speed-increasing rolling. The starting temperature of finishing rolling is set to 1040-1060℃; the finishing rolling ending temperature is >950℃. 5) Winding: After precision rolling, the rolls are fed into the winding mechanism for winding. 6) Uncoiling and welding: The adjacent sets of nickel-copper alloy hot-rolled plates are welded and fixed by a welding mechanism to facilitate the overall pickling of the nickel-copper alloy hot-rolled plates. 7) Annealing: The nickel-copper alloy hot-rolled plate is annealed by an annealing machine and then cooled; 8) Shot blasting to break phosphorus; annealed nickel-copper alloy hot-rolled plates are shot blasted using a shot blasting machine. 9) Pickling: The nickel-copper alloy hot-rolled plate is pickled to remove oxide scale by a pickling unit; the pickling process includes a first stage of mixed acid pickling and a second stage of mixed acid pickling. 10) Cleaning and drying: The hot-rolled nickel-copper alloy plate is cleaned by the cleaning unit, and then dried by the drying system before being rolled.

2. The hot-rolled coil and pickling surface treatment process of N04400 nickel-copper alloy according to claim 1, characterized in that... In step 1), the first heating stage is performed, with the temperature controlled at 1270-1280℃ and the heating time at 45-65 minutes. After the first heating stage is completed, the second heating stage is performed, with the temperature controlled at 1290-1330℃ and the heating time at 60-75 minutes. After the second heating stage is completed, the heat spreader stage is performed, with the temperature controlled at 1050-1110℃ and the heating time at 40-55 minutes. The total heating time is 145-195 minutes.

3. The hot-rolled coil and pickling surface treatment process of N04400 nickel-copper alloy according to claim 1, characterized in that... In step 4), the billet is rolled in 8 passes during finishing rolling; the reduction rate for the first pass is 22.0-22.5%; the reduction rate for the second pass is 24.0-24.5%; the reduction rate for the third pass is 24.5-25%; the reduction rate for the fourth pass is 23.5-24%; the reduction rate for the fifth pass is 21-21.5%; the reduction rate for the sixth pass is 16.5-17%; the reduction rate for the seventh pass is 15.0-15.5%; and the reduction rate for the eighth pass is 13.0-13.5%.

4. The hot-rolled coil and pickling surface treatment process of N04400 nickel-copper alloy according to claim 1, characterized in that... In step 9), the concentration of HNO3 in the first stage of the mixed acid is 75-85 g / L, the concentration of HF is 30-40 g / L, the metal ion concentration is <40 g / L, and the temperature is 50-60℃; the concentration of HNO3 in the second stage of the mixed acid is 65-70 g / L, the concentration of HF is 30-35 g / L, the metal ion concentration is 25-35 g / L, and the temperature is 50-55℃.

5. The hot-rolled coil and pickling surface treatment process of N04400 nickel-copper alloy according to claim 1, characterized in that... Step 9) The pickling mechanism includes a pickling tank, which contains a reversing roller to guide the hot-rolled plate to change direction. A first mounting groove is provided on the side wall of the pickling tank, containing a fixedly mounted encapsulation block. The pickling tank also contains a first brushing roller, a second brushing roller, and a mounting frame. The first brushing roller is positioned above the second brushing roller. The mounting frame is fixedly connected to the side wall of the pickling tank at both ends. The first brushing roller is rotatably connected to the mounting frame and the encapsulation block at both ends. The second brushing roller is rotatably connected to the side wall of the pickling tank at both ends. The hot-rolled plate is transferred between the first and second brushing rollers. The rotation of the first and second brushing rollers brushes the surface of the hot-rolled plate, assisting the acid solution in cleaning the oxide slag. A first motor is provided on the side wall of the pickling tank. The first motor shaft has a sprocket, and the second brushing roller is driven to rotate by transmitting power through a chain. A sealing groove is provided on the inner wall of the first mounting groove for filling and installing a sealing gasket, after which the encapsulation block is installed. A second mounting plate with bolt holes is provided on the outer wall of the first mounting groove.

6. The hot-rolled coil and pickling surface treatment process of N04400 nickel-copper alloy according to claim 5, characterized in that... The encapsulation block includes a pair of mounting boxes fixedly connected by bolts. A movable block is provided inside the mounting box, and a second mounting groove is provided inside the movable block. A spring is provided in the second mounting groove, and the spring pushes the mounting box so that the movable block can move up and down within the mounting box. Furthermore, a sealing strip is provided on the side wall of the movable block, which can achieve a sealing effect during the up and down movement of the movable block to prevent acid leakage. The top of the mounting box is provided with a first mounting plate and bolt holes. The encapsulation block is fixed by locking the first mounting plate and the second mounting plate together with bolts.

7. The hot-rolled coil and pickling surface treatment process of N04400 nickel-copper alloy according to claim 5, characterized in that... The mounting frame includes an electric actuator, a support plate, a mounting plate, a mounting frame, a second motor, and a third motor. The support plate is fixedly connected to the top of the side wall of the pickling tank. The mounting plate is located inside the pickling tank. The mounting plate has a guide shaft that is slidably connected to the support plate. The electric actuator is fixed to the support plate. The top shaft of the electric actuator passes through the support plate and is fixedly connected to the mounting plate. The mounting plate has mounting arms at both ends. The mounting arms are rotatably connected to the two ends of the first brushing roller. The mounting plate also has U-shaped frames at both ends. The U-shaped frames are fixedly connected to the mounting frame. There is a pair of mounting frames, which are respectively located on both sides of the pickling tank. The second motor is located on one side of the mounting frame, and the third motor is located on the other side of the mounting frame.

8. The hot-rolled coil and pickling surface treatment process of N04400 nickel-copper alloy according to claim 7, characterized in that... The first scrubbing roller includes a first sleeve, a second sleeve, and a third sleeve. The third sleeve is equipped with a control component. The first sleeve is sleeved on the second sleeve, and the second sleeve is sleeved on the third sleeve. The first sleeve has a first through groove at one end and a first sealing plate fixed with bolts at the other end. The first sealing plate and one end of the first sleeve have a fixed first rotating shaft. The first rotating shaft is rotatably connected to the mounting arm. The first rotating shaft passes through the moving block and is rotatably connected to it. At the same time, the first rotating shaft is also rotatably connected to the mounting frame. The first rotating shaft is hollow. The first rotating shaft has a sprocket and is connected to the second motor by transmitting power through a chain. Furthermore, the first sleeve also has several interval grooves and a brushing part. The brushing part is spaced apart from the interval grooves. Furthermore, a hook plate is provided on one side of the brushing part to hook the water flow upward. The second sleeve is fixedly connected to the third sleeve; one end of the third sleeve is provided with a fixed second sealing plate, and the second sealing plate is provided with a fixed second rotating shaft. The second rotating shaft is hollow. The third sleeve is also provided with an arc-shaped cover plate that is rotatably connected. The cover plate and the third sleeve can form a complete circular cylinder wall. The third sleeve is provided with auger blades and a matching third rotating shaft. The third rotating shaft on the auger blades is inserted into the second rotating shaft. One end of the third rotating shaft is provided with a sprocket and is connected to a third motor by transmitting power through a chain.

9. The hot-rolled coil and pickling surface treatment process of N04400 nickel-copper alloy according to claim 8, characterized in that... The control assembly includes a fixed frame, a first adjusting arm, a support, an L-shaped support plate, and a second adjusting arm. The fixed frame is fixed to the cover plate, and the support and the L-shaped support plate are fixed to the third sleeve. The first adjusting arm is hinged to the support, and one end of the first adjusting arm is provided with an adjusting shaft located inside the fixed frame. One end of the first adjusting arm is provided with an adjusting groove. The second adjusting arm is hinged to the L-shaped support plate, and one end of the second adjusting arm is also provided with an adjusting shaft located inside the adjusting groove. One end of the second adjusting arm is provided with an adjusting block. The adjusting block protrudes from the side wall of the second sleeve. The cover plate is provided with a fixed spring plate, which pushes against the inner wall of the first sleeve.

10. The hot-rolled coil and pickling surface treatment process of N04400 nickel-copper alloy according to claim 8, characterized in that... The second sleeve has an opening on its side wall, and support shafts and bolt holes at both ends. The support shafts assist the second sleeve in quickly inserting into the second sealing plate, which is then fixed with bolts. The other end of the second sleeve has a third sealing plate, which is inserted into the support shaft and fixed with bolts. The third sealing plate and the second sealing plate together form a closed cylinder at both ends of the second sleeve. The third sealing plate has a second through groove and a second rotating shaft. Furthermore, a fixed limiting sleeve is provided on the second rotating shaft. During installation, the second and third sleeves are first inserted into the first sleeve, and the second rotating shaft is inserted into the hollow first rotating shaft. Then, the first sealing plate is installed, and the first rotating shaft is sleeved onto the second rotating shaft. The limiting sleeve provides a limiting effect. The second rotating shaft has keyways and matching key blocks at both ends. The mounting frame also has keyways. The keyways and key blocks work together to form a spline connection between the second rotating shaft and the mounting frame, preventing the second rotating shaft and the second sleeve from rotating and facilitating installation. This keeps the opening on the second sleeve in a fixed position, allowing the acid solution after washing to enter the opening to the maximum extent.

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