A hot continuous rolling process for a corrosion-resistant stainless steel-carbon steel double-sided composite plate

Abstract

The present invention discloses a pickling process for hot continuous rolling strip steel of corrosion-resistant stainless steel-carbon steel double-sided composite plate and its process. The double-sided composite plate includes a base plate and a clad plate. It is characterized in that the specific steps of its production process are as follows: 1) welding and manufacturing of composite billets, 2) heating, 3) rough rolling, 4) finish rolling, 5) coiling, 6) uncoiling and welding, 7) annealing, 8) descaling and shot blasting, 9) pickling, 10) drying; the pickling mechanism in step 9) includes a pickling tank, a power mechanism, a brushing mechanism, and a support mechanism; the two ends of the pickling tank are provided with a feed inlet and a support roll I, the two ends inside the pickling tank are provided with deflecting rolls, and the inner wall of the pickling tank is provided with a chute; the power mechanism is arranged on one side inside the pickling tank, and a pair of support mechanisms are arranged at both ends inside the pickling tank and correspond to the deflecting rolls up and down; the brushing mechanism is arranged inside the pickling tank and is located between the support mechanisms. The present invention can ensure the surface quality of the composite plate through the pickling process and the use of the pickling mechanism.

Description

Technical Field

[0001] The invention belongs to the technical field of stainless steel plate production, and particularly relates to a hot continuous rolling process for a corrosion-resistant stainless steel-carbon steel double-sided composite plate. Background Art

[0002] The production process of the stainless steel-carbon steel double-sided composite plate includes heating, rough rolling, finish rolling, coiling, uncoiling and welding, annealing, descaling and shot blasting, pickling, cleaning, drying, and coiling; among which pickling is an important process for the surface quality treatment of the stainless steel-carbon steel double-sided composite plate; it mainly includes a pickling tank and pressure rollers or deflecting rollers in the pickling tank for changing the running direction of the stainless steel-carbon steel double-sided composite plate.

[0003] After retrieval, a titanium plate pickling system and its process with the application number 202011571691.2, in which the pressure rollers and supporting rollers in the pickling tank are mainly used for supporting and changing the running direction of the plate.

[0004] A 254SMo super austenitic stainless steel hot continuous rolling coil and its production process with the application number 202111017706.5, in which the moving roller I and the lower pressure roller are used for supporting and changing the running direction of the plate; although the pressure rollers, supporting rollers, moving roller I, and lower pressure roller in the above patents have well achieved their own supporting and deflecting functions, there are also the following drawbacks:

[0005] During the pickling process of the plate, metal scraps such as scale on the plate surface will gradually decompose and separate from the plate, and then flow away from the plate with the pickling solution. Some tightly adhered scale may slowly decompose after the plate is transported in the pickling tank for a long time; therefore, during this process, the scale will adhere to the deflecting rollers for changing the running direction of the plate along with the transportation of the plate, including the pressure rollers, supporting rollers, moving roller I, and lower pressure roller in the above patents; after long-term use, it will accumulate more and more, and then seriously affect the surface quality of the plate, including plate imprints, plate unevenness, etc. Summary of the Invention

[0006] The purpose of the invention is to overcome the deficiencies in the prior art and provide a hot continuous rolling process for a corrosion-resistant stainless steel-carbon steel double-sided composite plate, which can ensure the surface quality of the composite plate through the pickling process and the use of a pickling mechanism.

[0007] In order to achieve the above purpose, the technical solution adopted by the invention is:

[0008] A hot continuous rolling process for a corrosion-resistant stainless steel-carbon steel double-sided composite plate, the double-sided composite plate includes a base plate and a clad plate, the base plate is carbon steel, and the clad plate is stainless steel; the specific steps of its production process are as follows:

[0009] 1) Welding production of composite billets: First, produce the base plate and the clad plate. Then, use machining to process the surfaces of the base plate and the clad plate to be compounded, ensure flatness, and remove the rust layer and oxide layer on the surfaces to be compounded to keep the surfaces clean. Then, stack the base plate and the clad plate in sequence and weld them together to form a composite billet.

[0010] 2) Heating: Feed the composite billet into a heating furnace for heating. The main heating steps are divided into a preheating section, a first heating section, a second heating section, and a soaking section. The temperature of the preheating section is set at 820 - 880 °C, and the heating time is 50 - 80 min. After the preheating section is completed, it enters the first heating section for heating, with the temperature controlled at 1130 - 1160 °C and the heating time of 68 - 95 min. After the first heating section is completed, it enters the second heating section for heating, with the temperature controlled at 1300 - 1350 °C and the heating time of 35 - 50 min. After the second heating section is completed, it enters the soaking section, with the temperature controlled at 1350 - 1380 °C and the heating time of 35 - 55 min. The total heating duration is 185 - 280 min.

[0011] 3) Rough rolling: The composite billet enters the rough rolling mechanism through a heat preservation transmission mechanism, and the rough rolling mechanism conducts the first rough rolling on the heated composite billet. During rough rolling, the composite billet is rolled 7 passes. The reduction ratio of the first pass is 24 - 28%; the reduction ratio of the second pass is 24 - 28%; the reduction ratio of the third pass is 30 - 34%; the reduction ratio of the fourth pass is 32 - 35%; the reduction ratio of the fifth pass is 32 - 35%; the reduction ratio of the sixth pass is 26 - 29%; the reduction ratio of the seventh pass is 20 - 22%.

[0012] 4) Finish rolling: After rough rolling, the composite billet enters the finish rolling mechanism for finish rolling. Finish rolling uses speed-up rolling, and the starting rolling temperature of finish rolling is set at 1070 - 1090 °C; the ending temperature of finish rolling is controlled at > 900 °C, and water and steam descaling are used during finish rolling.

[0013] 5) Coiling: After finish rolling, it is fed into the coiling mechanism for coiling.

[0014] 6) Uncoiling and welding: Use a welding device to butt-weld and fix two groups of double-sided composite plates.

[0015] 7) Annealing: Use an annealing device to conduct annealing and cooling treatment on the double-sided composite plate.

[0016] 8) Scale breaking and shot blasting: Use a scale breaking device and a shot blasting device to perform tension leveling and scale removal and shot blasting operations on the annealed and cooled double-sided composite plate coil.

[0017] 9) Pickling: The oxide scale formed on the surface of the double-sided composite plate is pickled by a pickling mechanism; then it is cleaned by a cleaning mechanism; the pickling process has a first mixed acid stage and a second mixed acid stage; in the first mixed acid stage, the concentration of HNO3 is 80 - 95 g / L, the concentration of HF is 40 - 50 g / L, the metal ions < 38 g / L, and the temperature is 45 - 50 °C; in the second mixed acid stage, the concentration of HNO3 is 85 - 90 g / L, the concentration of HF is 30 - 35 g / L, the metal ions < 30 g / L, and the temperature is 50 - 55 °C;

[0018] 10) Drying: The residual water stains on the surface of the double-sided composite plate are dried by a drying mechanism, and then it is coiled and bundled by a coiling mechanism.

[0019] The pickling mechanism in step 9) includes a pickling tank, a power mechanism, a brushing mechanism, and a support mechanism; the two ends of the pickling tank are provided with a feed inlet and a support roller I, the two ends inside the pickling tank are provided with deflector rollers, and the inner wall of the pickling tank is provided with a chute; the power mechanism is arranged on one side inside the pickling tank, and a pair of support mechanisms are arranged at both ends inside the pickling tank and correspond to the deflector rollers up and down; the brushing mechanism is arranged inside the pickling tank and is located between the support mechanisms.

[0020] The power mechanism includes a motor I, an electric push rod I, a tensioning mechanism, and a chain I; the motor I is fixed on the outer wall of the pickling tank, the output shaft of the motor I passes through the outer wall of the pickling tank and is provided with a sprocket; a pair of electric push rods I are respectively fixed at both ends inside the pickling tank and correspond to the support mechanism, the top shaft of the electric push rod I is provided with a fixed frame I, one side of the fixed frame I is provided with a guide post I, the guide post I is arranged in the vertical chute arranged inside the pickling tank, the fixed frame I is provided with a roller shaft III, and the roller shaft III is provided with a sprocket and a gear I; the tensioning mechanism is fixed on the inner wall of the pickling tank and is located between the electric push rods I; the tensioning mechanism includes a fixed frame II, a limit plate II, and a spring I; the limit plate II is fixedly connected to the inner wall of the pickling tank; one side of the fixed frame II is provided with a pair of rollers, and the other side is provided with a guide shaft I and a guide shaft II which pass through the limit plate II and are slidably connected; a limit plate I is arranged on the guide shaft II, the spring I is sleeved on the guide shaft II, one end of the spring I abuts against the limit plate I, and the other end abuts against the limit plate II; the guide shaft II is driven by the spring I to drive the fixed frame II to slide downward along the guide shaft I; the chain I passes through the rollers on the fixed frame II and connects the sprocket at the shaft end of the motor I and the sprocket on the roller shaft III on the fixed frame I; the rotation of the gear I on the roller shaft III is driven by the power provided by the motor I, further, the fixed frame I is driven by the electric push rod I to move up and down along the chute where the guide post I is located, and the tensioning mechanism controls the tightness change of the chain I in real time.

[0021] The brushing mechanism includes a second motor, a second chain, a brush roll, a second electric push rod, a push block, a brush strip, a sealing plate, a fixing frame, and an adjusting plate. The second motor is fixed on the outer wall of the pickling tank. The shaft end of the second motor passes through the outer wall of the pickling tank and is provided with a sprocket at the shaft end. A pair of brush rolls are arranged on the upper and lower sides of the composite plate. Roller shafts I are provided at both ends of the brush roll and are movably connected to the outer wall of the pickling tank. A sprocket I is provided on one of the roller shafts I at one end. A number of slots are provided on the brush roll. A number of fixing frames are provided and are respectively inserted into the slots. A number of brush strips are provided and are respectively arranged in the fixing frames. Oblique end faces I are provided at both ends of the brush strip. A pair of sealing plates are provided and are respectively fixed to both ends of the brush roll by bolts. A through hole is provided in the center of the adjusting plate and sleeves the roller shaft I. A guiding shaft III and a limiting groove are provided on the adjusting plate. The guiding shaft III passes through the side wall of the pickling tank and is slidably connected. A number of push blocks are provided and are correspondingly arranged in the fixing frames. The push blocks pass through the sealing plates and are slidably connected. One end of the push block pushes against the oblique end face I of the brush strip. A limiting shaft is provided at one end of the push block. The limiting shaft is arranged in the limiting groove. The second electric push rod is arranged on the outer wall of the pickling tank. The top shaft of the second electric push rod passes through the side wall of the pickling tank and is fixedly connected to the adjusting plate. The second chain connects the sprocket I and the sprocket at the shaft end of the second motor.

[0022] Power is provided by the second motor to drive the rotation of the brush roll, so that the brush strip brushes the surface of the composite plate. At this time, the limiting shaft on one side of the push block rotates in the limiting groove. Then, the second electric push rod is used to push the adjusting plate to slide along the guiding shaft III, and further push the push block to slide in the fixing frame. Thus, by pushing the oblique end face I of the brush strip with the push block, the position height of the brush strip in the fixing frame is realized. Furthermore, the effect that the brush strip can be adjusted in time after severe wear and maintain the brushing effect is achieved, avoiding the situation that the brushing effect cannot be realized continuously when the brush strip is fixedly arranged and severely worn under normal circumstances. The combined action of the second electric push rod and the guiding shaft III prevents the rotation of the adjusting plate.

[0023] The supporting mechanism includes a third motor, a third chain, a second supporting roll, a rotating shaft, a scraping sleeve, a reciprocating lead screw, and an oil cylinder.

[0024] A pair of rotating shafts are provided and symmetrically arranged at both ends inside the pickling tank. Roller shafts II and fixed arms are provided at both ends of the rotating shafts. Both ends of the roller shafts II are rotatably connected to the side walls of the pickling tank. The roller shafts II are fixedly connected to the fixed arms. Support rollers II are provided at both ends of the fixed arms. A sprocket II is provided on one of the roller shafts II and is connected to the sprocket at the shaft end of the motor III through a chain III; A central through groove and a set of guide grooves are provided on the support roller II. A set of installation grooves are provided on one side of each guide groove. A number of sealing plates I and springs II are provided in the installation grooves. The springs II correspond to the bottom ends of the sealing plates I and push the sealing plates I to slide to close the guide grooves; A sealing plate II is provided at one end of the support roller II and is fixed by bolts. Oblique end faces II are provided on both sides of the sealing plate I. A limiting plate III is provided at the end of the sealing plate I to prevent it from slipping out of the installation groove; The reciprocating lead screw is arranged in the central through groove, and the smooth shafts at both ends of the reciprocating lead screw are rotatably connected to the sealing plate II and the other end of the support roller II; A gear II and a bearing are provided at the end of the reciprocating lead screw. The gear II meshes with the gear I on the fixed frame I.

[0025] A fixing plate is provided in the middle of the scraping sleeve. The fixing plate is arranged in the central through groove and the guide grooves of the support roller II. The fixing plate is connected to the reciprocating lead screw by threads. Brushing cylinders are provided on both sides of the fixing plate and are sleeved on the reciprocating lead screw. Brushes are provided on the inner walls of the scraping sleeves on both sides of the fixing plate for brushing the outer wall of the support roller II; A pair of scrapers are provided on each end face of the scraping sleeve. The scrapers are symmetrically distributed with the fixing plate as the center. Guide posts II are provided on the scrapers and are movably connected to the scraping sleeve. Springs III are sleeved on the guide posts II. Grooves and diversion grooves are provided on the side faces of the scrapers for diverting the scraped oxide scale to prevent it from entering the guide grooves and the central through groove. The diversion grooves are provided at both ends of the scrapers; The oil cylinder is fixed on the outer wall of the pickling tank. The top shaft of the oil cylinder passes through the outer wall of the pickling tank and is slidably connected. A jack is provided at the end of the top shaft of the oil cylinder for inserting the smooth shafts and bearings at both ends of the reciprocating lead screw to stably support the support roller II; The support roller II at both ends of the fixed arm is stably fixed through the use of the oil cylinder, the rotating shaft and the fixed arm.

[0026] The beneficial effects of the present invention compared with the prior art are as follows:

[0027] 1) When the support mechanism in the pickling tank is working, the oil cylinder's top shaft inserts into the optical axes at both ends of the reciprocating lead screw inside the support roller II at one end of the fixed arm. The support roller II at the other end of the fixed arm is used to support the composite plate. When it is necessary to clean the scale and metal debris adhered to the surface of the support roller II; first, unlock the oil cylinder's locking of the reciprocating lead screw and retract the fixed frame I through the electric push rod I to release the meshing state of gear I and gear II. Then, use the power provided by motor III to drive the rotating shaft to rotate through chain III, thereby swapping the positions of the support rollers II at both ends of the fixed arm. Then, insert the reciprocating lead screw through the oil cylinder to stabilize the support roller II to be cleaned. The electric push rod I controls the fixed frame I to slide down to make gear I mesh with gear II; then, use the power provided by motor I to drive gear I to rotate through chain I, thereby driving the reciprocating lead screw to rotate. At this time, the scraper is pushed and clamped against the support roller II by spring III. The scraping sleeve slides left and right along the guide groove driven by the reciprocating lead screw, thereby scraping the adhered scale on the surface of the support roller II with the scraper. Then, brush the surface of the support roller II again with a brush; at this time, the fixed plate pushes the inclined end face II of the sealing plate I to make the sealing plate I retract into the installation groove. When the fixed plate passes by, the sealing plate I is reset by the elastic force of spring II to close the guide groove to prevent debris from entering the central through groove and adhering to the reciprocating lead screw, affecting rotation and transmission. Further, brush the reciprocating lead screw with a brush cylinder to ensure smooth connection and rotation between the reciprocating lead screw and the fixed plate; the use of the scraping sleeve ensures the cleanliness of the surface of the support roller II, thereby ensuring the surface quality of the composite plate;

[0028] 2) When the brushing mechanism is working, the power provided by motor II drives the brush roller to rotate to realize the brushing of the surface of the composite plate by the brush strips. At this time, the limiting shaft on one side of the push block rotates in the limiting groove. Then, the electric push rod II pushes the adjusting plate to slide along the guide shaft III, thereby pushing the push block to slide in the fixed frame. Thus, the inclined end face I of the brush strip is pushed by the push block to realize the position height of the brush strip in the fixed frame, thereby realizing that the brush strip can be adjusted in time after severe wear and maintaining the brushing effect. This avoids the situation where the brushing effect cannot be continued when the brush strip is fixedly set and severely worn under normal circumstances; the combined action of the electric push rod II and the guide shaft III prevents the rotation of the adjusting plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] FIG Figure 1 is a schematic structural diagram of a hot continuous rolling process for a corrosion-resistant stainless steel-carbon steel double-sided composite plate according to the present invention;

[0030] FIG Figure 2 is the internal structural diagram of the pickling tank in FIG Figure 1 ;

[0031] FIG Figure 3 is the structural diagram of the brushing mechanism in FIG Figure 2 ;

[0032] FIG Figure 4 is the FIG Figure 3Structural Schematic of Middle Brush Roller Figure 1 ;

[0033] Appendix Figure 5 is Appendix Figure 3 Structural Schematic of Middle Brush Roller Figure 2 ;

[0034] Appendix Figure 6 is Appendix Figure 4 Structural Schematic of Middle Fixed Frame;

[0035] Appendix Figure 7 is Appendix Figure 4 Structural Schematic of Middle Brush Roller Figure 3 ;

[0036] Appendix Figure 8 is Appendix Figure 2 Structural Schematic of Middle Support Mechanism;

[0037] Appendix Figure 9 is Appendix Figure 8 Structural Schematic of Middle Scraping Sleeve;

[0038] Appendix Figure 10 is Appendix Figure 8 Cross-sectional Structural Schematic of Middle Scraping Sleeve;

[0039] Appendix Figure 11 is Appendix Figure 10 Structural Schematic of Middle Scraper;

[0040] Appendix Figure 12 is Appendix Figure 8 Structural Schematic of Middle Support Roller II Figure 1 ;

[0041] Appendix Figure 13 is Appendix Figure 8 Structural Schematic of Middle Support Roller II Figure 2 ;

[0042] Appendix Figure 14 is Appendix Figure 8 Structural Schematic of Middle Support Roller II Figure 3 ;

[0043] Appendix Figure 15 is Appendix Figure 13 Structural Schematic of Middle Sealing Plate I Figure 1 ;

[0044] Appendix Figure 16 is Appendix Figure 13 Structural Schematic of Middle Sealing Plate I Figure 2 ;

[0045] Appendix Figure 17 is Appendix Figure 2 Enlarged Schematic of Local Structure;

[0046] In the figure: 1. Pickling tank; 101. Feed inlet; 102. Support roller I; 103. Deflecting roller; 104. Slide groove; 2. Power mechanism; 21. Motor I; 22. Electric push rod I; 221. Fixed frame I; 2211. Guide post I; 2212. Roller shaft III; 2213. Gear I; 23. Tensioning mechanism; 231. Fixed frame II; 2311. Guide shaft I; 2312. Guide shaft II; 2313. Limit plate I; 2314. Roller; 232. Limit plate II; 233. Spring I; 24. Chain I; 3. Brushing mechanism; 31. Motor II; 32. Chain II; 33. Brush roller; 331. Roller shaft I; 3311. Sprocket I; 332. Slot; 34. Electric push rod II; 35. Pusher block; 351. Limit shaft; 36. Brush strip; 361. Oblique end face I; 37. Sealing plate; 38. Fixed frame; 39. Adjusting plate; 391. Guide shaft III; 392. Limit groove; 4. Support mechanism; 41. Motor III; 42. Chain III; 43. Support roller II; 431. Installation groove; 432. Sealing plate I; 4321. Limit plate III; 4322. Oblique end face II; 433. Spring II; 434. Guide groove; 435. Sealing plate II; 436. Central through groove; 44. Rotating shaft; 441. Roller shaft II; 4411. Sprocket II; 442. Fixed arm; 45. Scraping sleeve; 451. Scraper; 4511. Spring III; 4512. Guide post II; 4513. Groove; 4514. Drainage groove; 452. Brush cylinder; 453. Fixed plate; 454. Brush; 47. Reciprocating lead screw; 471. Bearing; 472. Gear II; 48. Oil cylinder; 5. Composite plate. Detailed implementation mode

[0047] For the convenience of understanding by those skilled in the art, the technical solution of the present invention will be further specifically described below in conjunction with the attached Figure 1-17 , and the technical solution of the present invention will be further specifically described.

[0048] Embodiment 1:

[0049] A hot continuous rolling process for a corrosion-resistant stainless steel-carbon steel double-sided composite plate. The double-sided composite plate includes a base plate and a clad plate. The base plate is carbon steel, and the clad plate is stainless steel; the composite plate includes a Q235 common carbon steel base plate and a 304 stainless steel clad plate. The size of the base plate is 9000mm×1540mm×182mm, and the size of the clad plate is 9000mm×1540mm×20mm. The specific production process steps are as follows:

[0050] 1) Welding and manufacturing of the composite billet; first, the base plate and the clad plate are manufactured, and then the surfaces to be composite of the base plate and the clad plate are processed by machining to ensure flatness, and the rust layer and oxide layer on the surfaces to be composite are removed to keep the surfaces clean. Then, the base plate and the clad plate are stacked and welded in sequence to form a composite billet;

[0051] 2) Heating: Feed the composite billet into a heating furnace for heating. The main heating steps are divided into a preheating section, a first heating section, a second heating section, and a soaking section. The temperature of the preheating section is set at 825°C, and the heating time is 78 minutes. After the preheating section is completed, it enters the first heating section for heating, with the temperature controlled at 1135°C and the heating time of 82 minutes. After the first heating section is completed, it enters the second heating section for heating, with the temperature controlled at 1325°C and the heating time of 45 minutes. After the second heating section is completed, it enters the soaking section, with the temperature controlled at 1365°C and the heating time of 42 minutes. The total heating duration is 247 minutes.

[0052] 3) Rough rolling: The composite billet enters the rough rolling mechanism through a heat preservation transmission mechanism, and the rough rolling mechanism conducts the first rough rolling on the heated composite billet. During rough rolling, the composite billet is rolled in 7 passes. The reduction ratio in the first pass is 24.5%; the reduction ratio in the second pass is 25.4%; the reduction ratio in the third pass is 32.5%; the reduction ratio in the fourth pass is 32%; the reduction ratio in the fifth pass is 32.5%; the reduction ratio in the sixth pass is 27.6%; the reduction ratio in the seventh pass is 20%.

[0053] 4) Finish rolling: After rough rolling, the composite billet enters the finish rolling mechanism for finish rolling. Finish rolling adopts speed-up rolling, and the starting temperature of finish rolling is set at 1085°C; the ending temperature of finish rolling is controlled at 950°C, and water and steam descaling are used during finish rolling.

[0054] 5) Coiling: After finish rolling, it is sent to the coiling mechanism for coiling;

[0055] 6) Uncoiling and welding: Use a welding device to butt-weld and fix two groups of double-sided composite plates;

[0056] 7) Annealing: Use an annealing device to conduct annealing and cooling treatment on the double-sided composite plate;

[0057] 8) Scale breaking and shot blasting: Use a scale breaking device and a shot blasting device to perform tension leveling and scale breaking and shot blasting operations on the annealed and cooled double-sided composite plate coil;

[0058] 9) Pickling: Use a pickling mechanism to pickle the oxide scale formed on the surface of the double-sided composite plate; then clean it through a cleaning mechanism; The pickling process has a first mixed acid stage and a second mixed acid stage. In the first mixed acid stage, the concentration of HNO3 is 85 g / L, the concentration of HF is 46 g / L, the metal ions are 35 g / L, and the temperature is 48°C; in the second mixed acid stage, the concentration of HNO3 is 86.3 g / L, the concentration of HF is 31.6 g / L, the metal ions are 28 g / L, and the temperature is 45°C;

[0059] 10) Drying: Use a drying mechanism to dry the residual water stains on the surface of the double-sided composite plate, and then conduct coiling and bundling through the coiling mechanism.

[0060] In step 9), the pickling mechanism includes a pickling tank 1, a power mechanism 2, a brushing mechanism 3, and a support mechanism 4; the two ends of the pickling tank 1 are provided with a feed port 101 and a support roller I 102, the inner ends of both sides of the pickling tank 1 are provided with deflection rollers 103, and the inner wall of the pickling tank 1 is provided with a chute 104; the power mechanism 2 is arranged on one side inside the pickling tank 1, and a pair of support mechanisms 4 are respectively arranged at both ends inside the pickling tank 1 and correspond to the deflection rollers 103 up and down; the brushing mechanism 3 is arranged inside the pickling tank 1 and between the support mechanisms 4.

[0061] The power mechanism 2 includes a motor I 21, an electric push rod I 22, a tensioning mechanism 23, and a chain I 24; the motor I 21 is fixed on the outer wall of the pickling tank 1, and the output shaft of the motor I 21 passes through the outer wall of the pickling tank 1 and is provided with a sprocket; a pair of electric push rods I 22 are respectively fixed at both ends inside the pickling tank 1 and correspond to the support mechanism 4, a fixed frame I 221 is arranged on the top shaft of the electric push rod I 22, a guide post I 2211 is arranged on one side of the fixed frame I 221, the guide post I 2211 is arranged in the vertical chute 104 arranged inside the pickling tank 1, a roller shaft III 2212 is arranged on the fixed frame I 221, and a sprocket and a gear I 2213 are arranged on the roller shaft III 2212; the tensioning mechanism 23 is fixed on the inner wall of the pickling tank 1 and is located between the electric push rods I 22; the tensioning mechanism 23 includes a fixed frame II 231, a limit plate II 232, and a spring I 233; the limit plate II 232 is fixedly connected to the inner wall of the pickling tank 1; a pair of rollers 2314 are arranged on one side of the fixed frame II 231, and a guide shaft I 2311 and a guide shaft II 2312 are arranged on the other side and pass through the limit plate II 232 and are slidably connected; a limit plate I 2313 is arranged on the guide shaft II 2312, the spring I 233 is sleeved on the guide shaft II 2312, one end of the spring I 233 abuts against the limit plate I 2313, and the other end abuts against the limit plate II 232; the guide shaft II 2312 is driven by the spring I 233 to drive the fixed frame II 231 to slide down along the guide shaft I 2311; the chain I 24 passes through the rollers 2314 on the fixed frame II 231 and connects the sprocket at the shaft end of the motor I 21 and the sprocket on the roller shaft III 2212 on the fixed frame I 221; the rotation of the gear I 2213 on the roller shaft III 2212 is driven by the power provided by the motor I 21. Further, the fixed frame I 221 is driven by the electric push rod I 22 to move up and down along the chute 104 where the guide post I 2211 is located, and the tensioning mechanism controls the tension change of the chain I 24 in real time.

[0062] The brushing mechanism 3 includes a second motor 31, a second chain 32, a brush roll 33, an electric push rod II 34, a push block 35, a brush strip 36, a sealing plate 37, a fixed frame 38, and an adjusting plate 39. The second motor 31 is fixed on the outer wall of the pickling tank 1. The shaft end of the second motor 31 passes through the outer wall of the pickling tank 1 and is provided with a sprocket at the shaft end. A pair of brush rolls 33 are provided on the upper and lower sides of the composite plate 5. Both ends of the brush roll 33 are provided with a first roller shaft 331 and are movably connected to the outer wall of the pickling tank 1. A first sprocket 3311 is provided on one of the first roller shafts 331. A number of slots 332 are provided on the brush roll 33. A number of fixed frames 38 are provided and are respectively inserted into the slots 332. A number of brush strips 36 are provided and are respectively arranged in the fixed frames 38. Oblique end faces I 361 are provided at both ends of the brush strip 36. A pair of sealing plates 37 are provided and are respectively fixed to both ends of the brush roll 33 by bolts. A through hole is provided in the center of the adjusting plate 39 and sleeves the first roller shaft 331. A third guide shaft 391 and a limiting groove 392 are provided on the adjusting plate 39. The third guide shaft 391 passes through the side wall of the pickling tank 1 and is slidably connected. A number of push blocks 35 are provided and are correspondingly arranged in the fixed frames 38. The push blocks 35 pass through the sealing plates 37 and are slidably connected. One end of the push block 35 pushes against the oblique end face I 361 of the brush strip 36. A limiting shaft 351 is provided at one end of the push block 35. The limiting shaft 351 is arranged in the limiting groove 392. The electric push rod II 34 is arranged on the outer wall of the pickling tank 1. The top shaft of the electric push rod II 34 passes through the side wall of the pickling tank 1 and is fixedly connected to the adjusting plate 39. The second chain 32 connects the first sprocket 3311 and the sprocket at the shaft end of the second motor 31.

[0063] Power is provided by the second motor 31 to drive the brush roll 33 to rotate, so as to realize the brushing of the surface of the composite plate 5 by the brush strip 36. At this time, the limiting shaft 351 on one side of the push block 35 rotates in the limiting groove 392. Then, the adjusting plate 39 is pushed by the electric push rod II 34 to slide along the third guide shaft 391, and further the push block 35 is pushed to slide in the fixed frame 38. Thus, by pushing the oblique end face I 361 of the brush strip 36 by the push block 35, the height position of the brush strip 36 in the fixed frame 38 is realized. Furthermore, it is realized that the brush strip 36 can be adjusted in time after serious wear and maintain the brushing effect, avoiding the situation that the brushing effect cannot be continued when the brush strip 36 is fixedly arranged and seriously worn under normal circumstances. The combined action of the electric push rod II 34 and the third guide shaft 391 avoids the rotation of the adjusting plate 39.

[0064] The support mechanism 4 includes a third motor 41, a third chain 42, a second support roll 43, a rotating shaft 44, a scraping sleeve 45, a reciprocating lead screw 47, and an oil cylinder 48.

[0065] A pair of rotating shafts 44 are provided and symmetrically arranged at both ends inside the pickling tank 1. Roller shafts II 441 and fixed arms 442 are provided at both ends of the rotating shaft 44. Both ends of the roller shaft II 441 are rotatably connected to the side wall of the pickling tank 1. The roller shaft II 441 is fixedly connected to the fixed arm 442. Support rollers II 43 are provided at both ends of the fixed arm 442. A sprocket II 4411 is provided on one of the roller shafts II 441 and is connected to the sprocket at the shaft end of the motor III 41 through a chain III 42. A central through groove 436 and a set of guide grooves 434 are provided on the support roller II 43. A set of mounting grooves 431 are provided on one side of each of the guide grooves 434. A number of sealing plates I 432 and springs II 433 are provided in the mounting grooves 431. The springs II 433 correspond to the bottom ends of the sealing plates I 432 and push the sealing plates I 432 to slide to close the guide grooves 434. A sealing plate II 435 is provided at one end of the support roller II 43 and is fixed by bolts. Oblique end faces II 4322 are provided on both sides of the sealing plate I 432. A limiting plate III 4321 is provided at the end of the sealing plate I 432 to prevent it from slipping out of the mounting groove 431. The reciprocating lead screw 47 is arranged in the central through groove 436, and the smooth shafts at both ends of the reciprocating lead screw 47 are rotatably connected to the sealing plate II 435 and the other end of the support roller II 43. A gear II 472 and a bearing 471 are provided at the end of the reciprocating lead screw 47. The gear II 472 meshes with the gear I 2213 on the fixed frame I 221.

[0066] A fixing plate 453 is provided in the middle of the scraping sleeve 45. The fixing plate 453 is arranged in the central through groove 436 and the guide groove 434 of the support roller II 43. The fixing plate 453 is connected to the reciprocating lead screw 47 by threads. Brushing cylinders 452 are provided on both sides of the fixing plate 453 and are sleeved on the reciprocating lead screw 47. Brushes 454 are provided on the inner walls of the scraping sleeves 45 on both sides of the fixing plate 453 for brushing the outer wall of the support roller II 43. A pair of scraping knives 451 are provided on each of the two end faces of the scraping sleeve 45. The scraping knives 451 are symmetrically distributed with the fixing plate 453 as the center. Guide posts II 4512 are provided on the scraping knives 451 and are movably connected to the scraping sleeve 45. Springs III 4511 are sleeved on the guide posts II 4512. Grooves 4513 and diversion grooves 4514 are provided on the side faces of the scraping knives 451 for diverting the scraped scale to prevent it from entering the guide groove 434 and the central through groove 436. The diversion grooves 4514 are provided at both ends of the scraping knives 451. The oil cylinder 48 is fixed on the outer wall of the pickling tank 1. The top shaft of the oil cylinder 48 passes through the outer wall of the pickling tank 1 and is slidably connected. A jack is provided at the end of the top shaft of the oil cylinder 48 for inserting the smooth shafts at both ends of the reciprocating lead screw 47 and the bearing 471 to stably support the support roller II 43. The support roller II 43 at both ends of the fixed arm 442 is stably fixed by using the oil cylinder 48, the rotating shaft 44 and the fixed arm 442.

[0067] When the support mechanism 4 is working, the oil cylinder 48 jacks the optical axes at both ends of the reciprocating lead screw 47 in the support roller II 43 at one end of the fixed arm 442. The support roller II 43 at the other end of the fixed arm 442 is used to support the composite board 5. When it is necessary to clean the scale and metal debris adhered to the surface of the support roller II 43; first, unlock the oil cylinder 48 from the reciprocating lead screw 47 and retract the fixed frame I 221 through the electric push rod I 22 to release the meshing state of the gear I 2213 and the gear II 472. Then, the motor III 41 provides power and drives the rotating shaft 44 to rotate through the chain III 42, so as to exchange the positions of the support rollers II 43 at both ends of the fixed arm 442. Then, the oil cylinder 48 inserts the reciprocating lead screw 47 to stabilize the support roller II 43 to be cleaned. The electric push rod I 22 controls the fixed frame I 221 to slide down to make the gear I 2213 mesh with the gear II 472; then, the motor I 21 provides power and drives the gear I 2213 to rotate through the chain I 24, and then drives the reciprocating lead screw 47 to rotate. At this time, the scraper 451 pushes and clamps the support roller II 43 through the spring III 4511. The scraping sleeve 45 slides left and right along the guide groove 434 driven by the reciprocating lead screw 47, so as to scrape the adhered scale on the surface of the support roller II 43 through the scraper 451, and then brush the surface of the support roller II 43 again through the brush 454; at this time, the fixing plate 453 pushes the inclined end face II 4322 of the sealing plate I 432 to make the sealing plate I retract into the installation groove 431. When the fixing plate 453 passes by, the sealing plate I 432 is reset by the elastic force of the spring II 433 to close the guide groove 434 to prevent debris from entering the central through groove 436 and adhering to the reciprocating lead screw 47 to affect the rotation and transmission. Further, the reciprocating lead screw 47 is brushed by the brush barrel 452 to ensure the smooth connection and rotation between the reciprocating lead screw 47 and the fixing plate 453; the use of the scraping sleeve 45 ensures the cleanliness of the surface of the support roller II 43, and thus ensures the surface quality of the composite board 5; when in use, the deflector roller 103 can be adjusted to replace the support mechanism 4 according to the actual situation.

[0068] Embodiment 2

[0069] The difference compared with Embodiment 1 is as follows:

[0070] Step 2) Heating: The temperature of the preheating section is set to 830 °C, and the heating time is 65 min; after the preheating section is completed, it enters the first heating section for heating, the temperature is controlled at 1140 °C, and the heating time is 78 min; after the first heating section is completed, it enters the second heating section for heating, the temperature is controlled at 1310 °C, and the heating time is 43 min; after the second heating section is completed, it enters the soaking section, the temperature is controlled at 1360 °C, and the heating time is 40 min; the total heating duration is 226 min.

[0071] Step 3) Rough rolling: The composite billet enters the rough rolling mechanism through the heat preservation transmission mechanism, and the rough rolling mechanism conducts primary rough rolling on the heated composite billet; during rough rolling, the composite billet is rolled for 7 passes; the reduction rate in the first pass is 25.6%; the reduction rate in the second pass is 26%; the reduction rate in the third pass is 33%; the reduction rate in the fourth pass is 34%; the reduction rate in the fifth pass is 34.5%; the reduction rate in the sixth pass is 28%; the reduction rate in the seventh pass is 20.5%.

[0072] Step 9) Pickling: The concentration of HNO3 in the first stage of the mixed acid is 86.5 g / L, the concentration of HF is 45.5 g / L, the metal ions are 32 g / L, and the temperature is 46 °C; the concentration of HNO3 in the second stage of the mixed acid is 85.5 g / L, the concentration of HF is 34.5 g / L, the metal ions are 27 g / L, and the temperature is 52 °C.

[0073] Example 3

[0074] What is different from Example 1 is that:

[0075] Step 2) Heating: The temperature of the preheating section is set at 833 °C, and the heating time is 68 min; after the preheating section is completed, it enters the first heating section for heating, the temperature is controlled at 1148 °C, and the heating time is 73 min; after the first heating section is completed, it enters the second heating section for heating, the temperature is controlled at 1330 °C, and the heating time is 38 min; after the second heating section is completed, it enters the soaking section, the temperature is controlled at 1355 °C, and the heating time is 50 min; the total heating duration is 229 min.

[0076] Step 3) Rough rolling: The composite billet enters the rough rolling mechanism through the heat preservation transmission mechanism, and the rough rolling mechanism conducts primary rough rolling on the heated composite billet; during rough rolling, the composite billet is rolled for 7 passes; the reduction rate in the first pass is 26.5%; the reduction rate in the second pass is 27.2%; the reduction rate in the third pass is 31.5%; the reduction rate in the fourth pass is 34.2%; the reduction rate in the fifth pass is 35%; the reduction rate in the sixth pass is 28.5%; the reduction rate in the seventh pass is 20.2%.

[0077] Step 9) Pickling: The concentration of HNO3 in the first stage of the mixed acid is 90.5 g / L, the concentration of HF is 42 g / L, the metal ions are 33.5 g / L, and the temperature is 47.5 °C; the concentration of HNO3 in the second stage of the mixed acid is 88 g / L, the concentration of HF is 33 g / L, the metal ions are 25.5 g / L, and the temperature is 52.5 °C.

[0078] Example 4

[0079] What is different from Example 1 is that in the pickling tank of the pickling mechanism, the support mechanism and the brushing mechanism are not put into use;

[0080] Comparative Example 1

[0081] The composite plate is prepared by the process of the manufacturing method of a double-sided stainless steel composite plate produced by a hot continuous rolling mill with the application number 201610613205.6 and the invention title. The sizes of the base plate and the clad plate are the same as those in Example 1.

[0082] Comparative Example 2

[0083] The composite plate is prepared by the process of the manufacturing method of a double-sided stainless steel composite plate produced by a hot continuous rolling mill with the application number 202211391663.1 and the invention title. The sizes of the base plate and the clad plate are the same as those in Example 1.

[0084] The sizes of the rolled composite plates in the above Examples 1 - 4 and Comparative Examples 1 - 2 are all 36000mm × 1540mm × 35mm, and samples are taken at the tail end of the composite plate for testing, with the sampling size being 35mm × 35mm.

[0085] The measured values of the mechanical properties of the formed composite plates in each example and comparative example are shown in the table:

[0086] Tensile strength Mpa Yield strength Mpa Elongation after fracture % Shear strength (MPa) Example 1 473 290 55.5 518 Example 2 477.5 265 56 526 Example 3 481 272 54 515 Example 4 475 281 53 522 Comparative Example 1 422 232 39 469 Comparative Example 2 418 228 40.5 466

[0087] Through the analysis of the experimental results of Examples 1 - 3, according to the rolling process and pickling process of the present invention, as well as the pickling mechanism used in conjunction with the pickling process, for the produced and rolled composite plates, all their mechanical properties meet the production requirements and the experimental data are stable.

[0088] By comparing the experimental data of Examples 1 - 4 with those of Comparative Example 1 and Comparative Example 2, although all the experimental data meet the production requirements, the data of Comparative Example 1 and Comparative Example 2 are significantly lower.

[0089] By comparing and analyzing Examples 1 - 3 with Example 4, according to visual observation of the surface of the composite plate, in the later stage of the production of the stainless steel plate coil in Example 4, small imprints or depressions formed by the pressing of oxidation slag gradually appear on the surface of the composite plate after 2 / 6 from the tail end of the composite plate; while in Examples 1 - 3, according to the above process and the use of the pickling mechanism, the surface of the produced double-sided composite plate is clean and smooth, with fewer concave and convex imprints in the second half of the composite plate, good quality, and meeting the surface quality control requirements.

[0090] By comparing and analyzing Examples 1 - 3 with Comparative Example 1 and Comparative Example 2, according to visual observation of the surface of the composite plate, the surface quality of the stainless steel composite plates produced in Comparative Example 1 and Comparative Example 2 is worse than that in Examples 1 - 3, and the imprints or pits on the covering surface gradually increase after 3 / 6 - 2 / 6 from the tail end of the composite plate.

[0091] The above content is only an example and illustration of the structure of the present invention. Those skilled in the art to which the present technology pertains can make various modifications, supplements, or use similar methods for substitution to the described specific embodiments, as long as they do not deviate from the structure of the invention or exceed the scope defined by this claim book, and all should fall within the protection scope of the present invention.

Claims

1. A hot continuous rolling process for a corrosion-resistant stainless steel-carbon steel double-sided composite plate, the double-sided composite plate comprising a base plate and a clad plate, the base plate being carbon steel and the clad plate being stainless steel; characterized in that The specific steps of its production process are as follows: 1) Welding and fabrication of the composite blank: First, fabricate the base plate and the clad plate. Then, use machining to process the surfaces of the base plate and the clad plate to be composite, ensure flatness, and remove the rust layer and oxide layer on the surfaces to be composite to keep the surfaces clean. Then, stack the base plate and the clad plate in sequence and weld and combine them into a composite blank; 2) Heating: Feed the composite blank into a heating furnace for heating. Its main heating steps are divided into a preheating section, a first heating section, a second heating section, and a soaking section; 3) Rough rolling: The composite blank enters the rough rolling mechanism through a heat-insulating transmission mechanism, and the rough rolling mechanism performs primary rough rolling on the heated composite blank; During rough rolling, the composite blank is rolled 7 passes; 4) Finish rolling: After rough rolling, the composite blank enters the finish rolling mechanism for finish rolling. Finish rolling uses speed-up rolling, and the finish rolling starting temperature is set at 1070 - 1090 °C; The finish rolling ending temperature is controlled at > 900 °C, and water and steam descaling are used during finish rolling; 5) Coiling: After finish rolling, feed it into the coiling mechanism for coiling; 6) Uncoiling and welding: Use a welding device to butt-weld and fix two groups of double-sided composite plates; 7) Annealing: Perform annealing and cooling treatment on the double-sided composite plate through an annealing device; 8) Scale-breaking and shot blasting: Perform tension leveling and scale-breaking and shot blasting operations on the annealed and cooled double-sided composite plate coil through a scale-breaking device and a shot blasting device; 9) Pickling: Use a pickling mechanism to pickle the oxide scale formed on the surface of the double-sided composite plate; Then, clean it through a cleaning mechanism; The pickling process has a first mixed acid stage and a second mixed acid stage; In the first mixed acid stage, the concentration of HNO3 is 80 - 95 g / L, the concentration of HF is 40 - 50 g / L, the metal ions are < 38 g / L, and the temperature is 45 - 50 °C; In the second mixed acid stage, the concentration of HNO3 is 85 - 90 g / L, the concentration of HF is 30 - 35 g / L, the metal ions are < 30 g / L, and the temperature is 50 - 55 °C; 10) Drying: Use a drying mechanism to dry the residual water stains on the surface of the double-sided composite plate, and then perform coiling and bundling through the coiling mechanism; The pickling mechanism includes a pickling tank, a power mechanism, a brushing mechanism, and a support mechanism; At both ends of the pickling tank, there are a feed inlet and a support roller I. At both ends inside the pickling tank, there are deflector rollers, and on the inner wall of the pickling tank, there are chutes; The power mechanism is arranged on one side inside the pickling tank, and there are a pair of support mechanisms, which are respectively arranged at both ends inside the pickling tank and correspond to the deflector rollers up and down; The brushing mechanism is arranged inside the pickling tank and is located between the support mechanisms; The support mechanism includes a motor III, a chain III, a support roller II, a rotating shaft, a scraping sleeve, a reciprocating lead screw, and an oil cylinder; there are a pair of rotating shafts symmetrically arranged at both ends inside the pickling tank. At both ends of the rotating shaft, there are roller shafts II and fixed arms. The two ends of the roller shaft II are rotatably connected to the side wall of the pickling tank. The roller shaft II is fixedly connected to the fixed arm. At both ends of the fixed arm, there are support rollers II. On one end of the roller shaft II, there is a sprocket II which is connected to the sprocket at the shaft end of the motor III through the chain III; on the support roller II, there are a central through groove and a set of guide grooves. On one side of each guide groove, there is a set of installation grooves. In the installation grooves, there are several sealing plates I and springs II. The springs II correspond to the bottom ends of the sealing plates I and push the sealing plates I to slide to close the guide grooves; at one end of the support roller II, there is a sealing plate II which is fixed by bolts. The two sides of the sealing plate I are provided with inclined end faces II, and a limiting plate III is provided at the end of the sealing plate I to prevent it from slipping out of the installation groove; the reciprocating lead screw is arranged in the central through groove, and the smooth shafts at both ends of the reciprocating lead screw are rotatably connected to the sealing plate II and the other end of the support roller II; at the end of the reciprocating lead screw, there are a gear II and a bearing, and the gear II meshes with the gear I on the fixed frame I.

2. The hot continuous rolling process of a corrosion-resistant stainless steel-carbon steel double-sided composite plate according to claim 1, characterized in that In step 3), the reduction ratios in the seven passes of rough rolling are as follows: the reduction ratio in the first pass is 24 - 28%; the reduction ratio in the second pass is 24 - 28%; the reduction ratio in the third pass is 30 - 34%; the reduction ratio in the fourth pass is 32 - 35%; the reduction ratio in the fifth pass is 32 - 35%; the reduction ratio in the sixth pass is 26 - 29%; the reduction ratio in the seventh pass is 20 - 22%.

3. The hot continuous rolling process of a corrosion-resistant stainless steel-carbon steel double-sided composite plate according to claim 1, characterized in that In step 2), the temperature in the preheating section is set to 820 - 880 °C, and the heating time is 50 - 80 min; after the preheating section is completed, it enters the first heating section for heating, and the temperature is controlled at 1130 - 1160 °C, and the heating time is 68 - 95 min; after the first heating section is completed, it enters the second heating section for heating, and the temperature is controlled at 1300 - 1350 °C, and the heating time is 35 - 50 min; after the second heating section is completed, it enters the soaking section, and the temperature is controlled at 1350 - 1380 °C, and the heating time is 35 - 55 min; the total heating duration is 185 - 280 min.

4. The hot tandem rolling process of a corrosion-resistant stainless steel-carbon steel double-sided composite plate according to claim 1, characterized in that The power mechanism includes a motor I, an electric push rod I, a tensioning mechanism, and a chain I; the motor I is fixed on the outer wall of the pickling tank, and the output shaft of the motor I passes through the outer wall of the pickling tank and is provided with a sprocket; there are a pair of electric push rods I which are respectively fixed at both ends inside the pickling tank and correspond to the support mechanism. On the top shaft of the electric push rod I, there is a fixed frame I. On one side of the fixed frame I, there is a guide post I, and the guide post I is arranged in the vertical chute set inside the pickling tank. On the fixed frame I, there is a roller shaft III, and on the roller shaft III, there are a sprocket and a gear I.

5. The hot continuous rolling process of a corrosion-resistant stainless steel-carbon steel double-sided composite plate according to claim 4, characterized in that The tensioning mechanism is fixed on the inner wall of the pickling tank and is located between the electric push rods I; the tensioning mechanism includes a fixed frame II, a limiting plate II, and a spring I; the limiting plate II is fixedly connected to the inner wall of the pickling tank; on one side of the fixed frame II, there are a pair of rollers, and on the other side, there are a guide shaft I and a guide shaft II which pass through the limiting plate II and are slidably connected; on the guide shaft II, there is a limiting plate I, and the spring I is sleeved on the guide shaft II. One end of the spring I abuts against the limiting plate I, and the other end abuts against the limiting plate II; the chain I passes through the rollers on the fixed frame II and connects the sprocket at the shaft end of the motor I and the sprocket on the roller shaft III on the fixed frame I.

6. A hot continuous rolling process for a corrosion-resistant stainless steel-carbon steel double-sided composite plate according to claim 1, characterized in that The brushing mechanism includes a second motor, a second chain, a brush roller, a second electric push rod, a pushing block, a brush strip, a sealing plate, a fixing frame, and an adjusting plate; the second motor is fixed on the outer wall of the pickling tank, the shaft end of the second motor passes through the outer wall of the pickling tank and is provided with a sprocket at the shaft end; a pair of brush rollers are provided and arranged on the upper and lower sides of the composite plate; roller shafts I are provided at both ends of the brush roller and are movably connected to the outer wall of the pickling tank, and a sprocket I is provided on one of the roller shafts I, and a number of slots are provided on the brush roller; a number of fixing frames are provided and respectively inserted into the slots, a number of brush strips are provided and respectively arranged in the fixing frames, and inclined end faces I are provided at both ends of the brush strip; a pair of sealing plates are provided and respectively fixed to both ends of the brush roller by bolts; a through hole is provided in the center of the adjusting plate and sleeved on the roller shaft I, and a guiding shaft III and a limiting groove are provided on the adjusting plate; the guiding shaft III passes through the side wall of the pickling tank and is slidably connected; a number of pushing blocks are provided and correspondingly arranged in the fixing frames, the pushing blocks pass through the sealing plates and are slidably connected, one end of the pushing block pushes against the inclined end face I of the brush strip, and a limiting shaft is provided at one end of the pushing block; the limiting shaft is arranged in the limiting groove; the second electric push rod is arranged on the outer wall of the pickling tank, and the top shaft of the second electric push rod passes through the side wall of the pickling tank and is fixedly connected to the adjusting plate; the second chain connects the sprocket I and the sprocket at the shaft end of the second motor.

7. A hot continuous rolling process for a corrosion-resistant stainless steel-carbon steel double-sided composite plate according to claim 1, characterized in that A fixing plate is provided in the middle of the scraping sleeve, the fixing plate is arranged in the central through groove and the guiding groove of the second support roller, the fixing plate is connected to the reciprocating lead screw by threads, brush barrels are provided on both sides of the fixing plate and sleeved on the reciprocating lead screw, and brushes are provided on the inner walls of the scraping sleeves on both sides of the fixing plate for brushing the outer wall of the second support roller; a pair of scrapers are provided on each of the two end faces of the scraping sleeve, the scrapers are symmetrically distributed with the fixing plate as the center, guiding columns II are provided on the scrapers and are movably connected to the scraping sleeve, springs III are sleeved on the guiding columns II, grooves and diversion grooves are provided on the side faces of the scrapers, and the diversion grooves are arranged at both ends of the scrapers; the oil cylinder is fixed on the outer wall of the pickling tank, the top shaft of the oil cylinder passes through the outer wall of the pickling tank and is slidably connected, and a jack is provided at the end of the top shaft of the oil cylinder for inserting the optical shafts and bearings at both ends of the reciprocating lead screw.

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