A production process for hot-rolled strip steel of heavy nickel-based alloy N08825

Abstract

The present invention discloses a process for producing hot-rolled strip steel of heavy nickel-based alloy N08825, comprising the following steps: 1) heating; 2) descaling; 3) rough rolling: the heated steel slab is transferred to a roughing mill via an insulated transmission channel, where it is rolled in five passes; the first pass has a reduction of 20%-25%; the second pass has a reduction of 27%-30%; the third pass has a reduction of 30%-35%; the fourth pass has a reduction of 23%-26%; and the fifth pass has a reduction of 18%-22%; 4) hot coil box treatment; 5) finish rolling; 6) coiling; 7) uncoiling and welding; 8) annealing; 9) scale removal and shot blasting; 10) pickling; and 11) cleaning and drying. By utilizing conventional hot-rolling lines to roll N08825 strip coils, the present invention can effectively reduce energy consumption, improve production efficiency, and enhance strip stability.

Description

Technical Field

[0001] The invention belongs to the technical field of hot continuous rolling of heavy nickel-based alloy N08825, and in particular relates to a production process of hot continuous rolling of heavy nickel-based alloy N08825 strip steel. Background Art

[0002] N08825 alloy is a nickel-based nickel-chromium-iron alloy. It is a high-temperature corrosion-resistant alloy with strong corrosion resistance to acid and alkali solutions, especially in chloride ion solutions, where it has stronger resistance to stress corrosion than other metals. It is widely used in shipbuilding, pressure vessels, petrochemical industry, heat exchangers and other industries.

[0003] N08825 steel billets are rolled through conventional hot rolling production lines. The rolling lines ensure stable batches and high yield rates of N08825 strip coils, but the rolling lines often have high energy consumption and low production efficiency. In fact, the existing technology has the following problems in the process of rolling N08825 steel billets: 1) During the rolling of the steel strip using the finishing mill, some oxide scale or other impurities are easily adhered to the rollers. If not cleaned in time, defects or scratches will be caused on the surface of the strip, affecting the surface quality of the strip; 2) The existing grinding device causes irregular splashing of debris during the grinding process of the rollers. The debris will fly onto the surface of the steel strip and enter the next rolling mill or fly into the parts, increasing the wear of the mechanical parts. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a production process for hot-rolled strip steel of heavy nickel-based alloy N08825. Hot-rolling of N08825 strip coils can effectively reduce energy consumption and improve production efficiency and strip stability.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A production process for hot-rolled strip steel of heavy nickel-based alloy N08825, the process steps of which are as follows:

[0007] 1) Heating: The steel billet is sent to the heating furnace for heating. The heating steps are divided into preheating section, heating section 1, heating section 2, and soaking section. The temperature of the preheating section is controlled at 600℃-750℃, and the heating time is controlled at 60min-100min; the temperature of the heating section 1 is controlled at 1050℃-1150℃, and the heating time is controlled at 25min-45min; the temperature of the heating section 2 is controlled at 1180℃-1230℃, and the heating time is controlled at 30min-50min; the temperature of the soaking section is controlled at 1200℃-1270℃, and the heating time is controlled at 30min-45min. The total heating time is 190min-235min.

[0008] 2) Descaling: Descaling the surface of the billet using high-pressure steam or high-pressure water according to the thickness of the billet;

[0009] 3) Rough rolling: The heated billet is transferred to the rough rolling mill through the heat-insulating transmission channel, and the billet is rolled in 5 passes through the rough rolling mill; the first pass reduction rate is 20%-25%; the second pass reduction rate is 27%-30%; the third pass reduction rate is 30%-35%; the fourth pass reduction rate is 23%-26%; and the fifth pass reduction rate is 18%-22%;

[0010] 4) Hot coil box treatment: The steel strip after rough rolling passes through the hot coil box for head change operation to reduce the temperature difference between the head and tail of the steel strip;

[0011] 5) Finishing rolling: The steel strip is conveyed to the finishing mill through a heat-insulating conveying channel and rolled using seven stands. The inlet temperature is controlled at 970°C-1055°C, and the finishing temperature is >900°C. Grinding devices are installed on both sides of the rollers in the finishing mill to grind the rollers in real time to ensure the flatness of the steel strip.

[0012] The described finishing mill is fixedly mounted with support rods at both ends, and a movable frame is movably mounted on the support rods, and both ends of the movable frame are fixedly connected to one end of a hydraulic telescopic rod I, and the other end of the hydraulic telescopic rod I is fixedly mounted on the finishing mill; a telescopic protective cover is movably mounted on the movable frame, and a rack is provided on the outside of the telescopic protective cover, which is meshed with a gear provided at the output end of motor I; motor I is fixedly mounted on the movable frame, and the upper and lower ends of the telescopic protective cover are movably mounted on the guide rods respectively, and both ends of the guide rods are fixedly mounted on the support rods, and are staggered above the telescopic protective cover on the same side, and a dust guard plate is movably mounted on the bottom, and one side of the dust guard plate is fixedly connected to one end of a spring, and the other end of the spring is fixedly connected to the telescopic protective cover, and a collecting pipe is fixedly connected to the telescopic protective cover on one side of the dust guard plate, and one end of the collecting pipe is connected to a collecting box through a hose, and one side of the collecting box is fixedly connected to a negative pressure fan;

[0013] A guide frame is movably installed in the telescopic protective cover, one side of the guide frame is fixedly connected to one end of the hydraulic telescopic rod II, and the other end of the hydraulic telescopic rod II is fixedly installed on the telescopic protective cover, and a fine grinding mechanism and a connecting rod are respectively provided on the two sets of oppositely arranged guide frames in the telescopic protective cover, one of which is fixedly installed with a connecting rod at the front end of one group of guide frames, a slide groove is provided on the connecting rod, a clamp is movably installed in the slide groove, one end of the clamp is fixedly installed on the movable plate, and the movable plate is movably installed on the limit plate in engagement with the limit plate, one side of the movable plate is fixedly connected to one end of the hydraulic telescopic rod IV, and the other end of the hydraulic telescopic rod IV is fixedly installed on the limit plate, one side of the limit plate is fixedly connected to the hydraulic telescopic rod III, and the hydraulic telescopic rod III is fixedly installed on the guide frame, a spline shaft is movably installed on the front end of the connecting rod, and a grinding roller is movably installed on the spline shaft, an adjusting gear is provided on one side of the spline shaft, the adjusting gear is meshed with the locking rod, one side of the locking rod is fixedly connected to one end of the hydraulic telescopic rod V, and the other end of the hydraulic telescopic rod V is fixedly installed on the connecting rod;

[0014] The fine grinding mechanism includes a guide rack, a movable sleeve, a motor II, a support frame, a motor III, a support roller, and a grinding belt. The guide rack is fixedly mounted on the front end of the guide frame, a movable sleeve is movably mounted on the guide rack, and a motor II is fixedly mounted below the movable sleeve. A gear provided at the output end of motor II is meshed and connected with the guide rack. The movable sleeve is fixedly mounted on the support frame, and support rollers are movably mounted on both sides of the support frame. A grinding belt is wound around the support rollers. A sprocket provided on one group of support roller rotating shafts is meshed and connected with a sprocket provided at the output end of motor III. Motor III is fixedly mounted on the movable sleeve.

[0015] A limit block is provided on one side of the dust shield, and the limit block is fixedly mounted on the telescopic protective cover to prevent the dust shield from turning over at an excessively large angle.

[0016] 6) Coiling: The strip after finish rolling enters the coiling mechanism for coiling operation;

[0017] 7) Uncoiling and welding: The cooled steel coil is unwound through the uncoiler and the two adjacent groups are welded and fixed by the welding mechanism to facilitate the overall pickling of the steel plate;

[0018] 8) Annealing: The strip steel is annealed by the annealing mechanism;

[0019] 9) Scaling shot blasting: The annealed strip steel is shot blasted by a shot blasting machine;

[0020] 10) Pickling: The strip is pickled to remove oxide scale through the pickling mechanism. The pickling process includes a mixed acid stage 1 and a mixed acid stage 2. The mixed acid stage 1 has an HNO3 concentration of 45-55g / L, an HF concentration of 6-10g / L, metal ions <40g / L, and a temperature of 40-50°C. The mixed acid stage 2 has an HNO3 concentration of 65-75g / L, an HF concentration of <3g / L, metal ions <35g / L, and a temperature of 30-35°C.

[0021] 11) Cleaning and drying: The pickled iron-nickel alloy plate is cleaned by a cleaning mechanism, and then dried by a drying system before being curled.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] 1) Grinding devices are installed on both sides of the finishing mill rolls, and the rolls are roughly ground by the grinding rollers to remove the larger particles adhering to the rolls. The rolls are then finely ground by the fine grinding mechanism to ensure a smooth surface.

[0024] 2) During the grinding process, the grinding roller moves as a whole through the movable frame, so that the grinding roller can be closely attached to the roller for grinding. At the same time, the grinding roller is movably mounted on the spline shaft and can slide as a whole but cannot rotate. The clamp is driven by the hydraulic telescopic rod III to engage with the grinding roller. At the same time, the reciprocating extension and retraction of the hydraulic telescopic rod IV can drive the grinding roller to reciprocate along the spline shaft through the clamp, thereby avoiding increased local wear of the grinding roller and causing incomplete grinding;

[0025] 3) In the fine grinding mechanism, the movable sleeve is driven by motor II to move back and forth along the guide rack, thereby driving the two sets of grinding belts on the movable sleeve to grind the grinding roller back and forth carefully to avoid burrs on the grinding roller and other scratches on the strip steel.

[0026] 4) During the grinding process, the debris that falls will be blocked by the telescopic protective cover and the movable plate. Then the negative pressure fan will pump the fallen debris along the collection pipe on the side of the telescopic protective cover through the hose into the collection box for unified collection and treatment, which can prevent the debris from splashing into the mechanical structure and causing wear of mechanical parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Attachment Figure 1 This is a schematic structural diagram of a grinding device in step 5) of a production process for hot-rolled strip steel of a heavy nickel-based alloy N08825 according to the present invention;

[0028] Attachment Figure 2 It is a schematic diagram of the side structure of the grinding device;

[0029] Attachment Figure 3 It is a schematic diagram of the movable frame structure;

[0030] Attachment Figure 4 1. It is a schematic diagram of the structure of the telescopic protective cover;

[0031] Attachment Figure 5 It is a schematic diagram of the grinding roller structure;

[0032] Attachment Figure 6 1. It is a schematic diagram of the locking rod structure;

[0033] Attachment Figure 7 Schematic diagram of the guide rack structure;

[0034] Attachment Figure 8 It is a structural diagram of the fine grinding mechanism;

[0035] Attachment Figure 9 It is attached Figure 4 A partial enlarged view of the middle A;

[0036] Figure: 11, finishing mill; 12, support rod; 13, movable frame; 14, hydraulic telescopic rod I; 15, telescopic protective cover; 16, motor I; 17, connecting rod; 18, fine grinding mechanism; 19, collection box; 20, negative pressure fan; 121, guide rod; 151, rack; 152, hydraulic telescopic rod II; 153, guide frame; 154, dust shield; 1541, limit block; 155, spring; 156, collection pipe; 171, chute ; 172. Hydraulic telescopic rod III; 173. Limit plate; 174. Movable plate; 175. Hydraulic telescopic rod IV; 176. Clamp; 177. Grinding roller; 178. Spline shaft; 1781. Adjusting gear; 179. Locking rod; 1791. Hydraulic telescopic rod V; 181. Guide rack; 182. Movable sleeve; 183. Motor II; 184. Support frame; 185. Motor III; 186. Support roller; 187. Grinding belt. DETAILED DESCRIPTION

[0037] To facilitate understanding by those skilled in the art, Figure 1-9 , the technical solution of the present invention is further described in detail.

[0038] Example 1:

[0039] A production process for hot-rolled strip steel of heavy nickel-based alloy N08825, the process steps of which are as follows:

[0040] 1) Heating: The billet is sent to the heating furnace for heating. The heating steps are divided into preheating section, heating section 1, heating section 2, and soaking section. The temperature of the preheating section is controlled at 660℃ and the heating time is controlled at 88min; the temperature of the heating section 1 is controlled at 1080℃ and the heating time is controlled at 40min; the temperature of the heating section 2 is controlled at 1220℃ and the heating time is controlled at 42min; the temperature of the soaking section is controlled at 1260℃ and the heating time is controlled at 38min. The total heating time is 208min.

[0041] 2) Descaling: Descaling the surface of the billet using high-pressure steam or high-pressure water according to the thickness of the billet;

[0042] 3) Rough rolling: The heated billet is transferred to the rough rolling mill through the heat-insulating transmission channel, and the billet is rolled in 5 passes through the rough rolling mill; the first pass reduction rate is 21.8%; the second pass reduction rate is 27.3%; the third pass reduction rate is 32.5%; the fourth pass reduction rate is 24.7%; and the fifth pass reduction rate is 18.5%;

[0043] 4) Hot coil box treatment: The steel strip after rough rolling passes through the hot coil box for head change operation to reduce the temperature difference between the head and tail of the steel strip;

[0044] 5) Finishing rolling: The steel strip is conveyed to the finishing mill through a heat-insulating conveyor channel and rolled using seven stands. The inlet temperature is controlled at 980°C and the finishing temperature is 950°C. Grinding devices are installed on both sides of the rollers in the finishing mill to grind the rollers in real time to ensure the flatness of the steel strip.

[0045] The finishing mill 11 is fixedly provided with support rods 12 at both ends, and a movable frame 13 is movably provided on the support rod 12. Both ends of the movable frame 13 are fixedly connected to one end of a hydraulic telescopic rod Ⅰ 14, and the other end of the hydraulic telescopic rod Ⅰ 14 is fixedly installed on the finishing mill 11. A telescopic protective cover 15 is movably provided on the movable frame 13, and a rack 151 is provided on the outside of the telescopic protective cover 15. The rack 151 is meshed with a gear provided at the output end of the motor Ⅰ 16. The motor Ⅰ 16 is fixedly installed on the movable frame 13, and the upper and lower ends of the telescopic protective cover 15 are respectively It is movably mounted on the guide rod 121, and both ends of the guide rod 121 are fixedly mounted on the support rod 12. They are staggered above the telescopic protective cover 15 on the same side, and a dust shield 154 is movably mounted at the bottom. One side of the dust shield 154 is fixedly connected to one end of a spring 155, and the other end of the spring 155 is fixedly connected to the telescopic protective cover 15. A collection pipe 156 is fixedly connected to the telescopic protective cover 15 on one side of the dust shield 154. One end of the collection pipe 156 is connected to the collection box 19 through a hose, and one side of the collection box 19 is fixedly connected to the negative pressure fan 20.

[0046] The telescopic protective cover 15 is movably installed with a guide frame 153, one side of the guide frame 153 is fixedly connected to one end of the hydraulic telescopic rod II 152, and the other end of the hydraulic telescopic rod II 152 is fixedly installed on the telescopic protective cover 15. The two sets of oppositely arranged guide frames 153 in the telescopic protective cover 15 are respectively provided with a fine grinding mechanism 18 and a connecting rod 17. One set of guide frames 153 is fixedly installed at the front end of the connecting rod 17, and a slide groove 171 is provided on the connecting rod 17. A clamp 176 is movably installed in the slide groove 171, and one end of the clamp 176 is fixedly installed on the movable plate 174. The movable plate 174 is engaged and movably installed on the limit plate 173. The movable plate 1 One side of 74 is fixedly connected to one end of a hydraulic telescopic rod IV 175, the other end of the hydraulic telescopic rod IV 175 is fixedly mounted on a limit plate 173, one side of the limit plate 173 is fixedly connected to a hydraulic telescopic rod III 172, the hydraulic telescopic rod III 172 is fixedly mounted on the guide frame 153, a spline shaft 178 is movably mounted on the front end of the connecting rod 17, a grinding roller 177 is movably mounted on the spline shaft 178, an adjusting gear 1781 is provided on one side of the spline shaft 178, the adjusting gear 1781 is engaged with a locking rod 179, one side of the locking rod 179 is fixedly connected to one end of a hydraulic telescopic rod V 1791, the other end of the hydraulic telescopic rod V 1791 is fixedly mounted on the connecting rod 17;

[0047] The fine grinding mechanism 18 includes a guide rack 181, a movable sleeve 182, a motor II 183, a support frame 184, a motor III 185, a support roller 186, and a grinding belt 187. The guide rack 181 is fixedly mounted on the front end of the guide frame 153, and a movable sleeve 182 is movably mounted on the guide rack 181. The motor II 183 is fixedly mounted below the movable sleeve 182. The gear provided at the output end of the motor II 183 is meshed and connected with the guide rack 181. The movable sleeve 182 is fixedly mounted on the support frame 184. Support rollers 186 are movably mounted on both sides of the support frame 184. A grinding belt 187 is wound around the support rollers 186. A sprocket provided on the rotating shaft of one group of support rollers 186 is meshed and connected with a sprocket provided at the output end of the motor III 185. The motor III 185 is fixedly mounted on the movable sleeve 182.

[0048] A limit block 1541 is provided on one side of the dust shield 154 , and the limit block 1541 is fixedly mounted on the telescopic protective cover 15 to prevent the dust shield 154 from turning over at an excessively large angle.

[0049] 6) Coiling: The strip after finish rolling enters the coiling mechanism for coiling operation;

[0050] 7) Uncoiling and welding: The cooled steel coil is unwound through the uncoiler and the two adjacent groups are welded and fixed by the welding mechanism to facilitate the overall pickling of the steel plate;

[0051] 8) Annealing: The strip steel is annealed by the annealing mechanism;

[0052] 9) Scaling shot blasting: The annealed strip steel is shot blasted by a shot blasting machine;

[0053] 10) Pickling: The steel strip is pickled to remove oxide scale in a pickling mechanism. The pickling process includes a mixed acid stage 1 and a mixed acid stage 2. The mixed acid stage 1 has an HNO3 concentration of 46 g / L, an HF concentration of 6 g / L, a metal ion concentration of 30 g / L, and a temperature of 40°C. The mixed acid stage 2 has an HNO3 concentration of 68 g / L, an HF concentration of 1 g / L, a metal ion concentration of 20 g / L, and a temperature of 32°C.

[0054] 11) Cleaning and drying: The pickled iron-nickel alloy plate is cleaned by a cleaning mechanism, and then dried by a drying system before being curled.

[0055] Example 2:

[0056] The difference compared with Example 1 is:

[0057] Step 1) Heating: The steel billet is sent to a heating furnace for heating. The 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 controlled at 710°C and the heating time is controlled at 83 minutes; the temperature of the first heating section is controlled at 1130°C and the heating time is controlled at 39 minutes; the temperature of the second heating section is controlled at 1200°C and the heating time is controlled at 48 minutes; the temperature of the soaking section is controlled at 1230°C and the heating time is controlled at 41 minutes. The total heating time is 211 minutes.

[0058] Step 3) Rough rolling: The heated billet is transferred to the roughing mill through a heat-insulating transmission channel, and the billet is rolled in five passes through the roughing mill; the first pass has a reduction rate of 23.6%; the second pass has a reduction rate of 29.2%; the third pass has a reduction rate of 34.1%; the fourth pass has a reduction rate of 25.2%; and the fifth pass has a reduction rate of 19.8%.

[0059] Step 5) Finishing rolling: The steel strip is conveyed to the finishing mill through a heat-insulating conveyor channel and rolled using seven stands. The inlet temperature is controlled at 1040°C and the finishing temperature is 1000°C. Grinding devices are installed on both sides of the rollers in the finishing mill to grind the rollers in real time to ensure the flatness of the steel strip.

[0060] Step 10) Pickling: The strip is pickled to remove oxide scale in a pickling mechanism. The pickling process includes a mixed acid stage 1 and a mixed acid stage 2. The mixed acid stage 1 has an HNO3 concentration of 51 g / L, an HF concentration of 8 g / L, a metal ion concentration of 25 g / L, and a temperature of 45°C. The mixed acid stage 2 has an HNO3 concentration of 72 g / L, an HF concentration of 0.5 g / L, a metal ion concentration of 25 g / L, and a temperature of 30°C.

[0061] Example 3:

[0062] The difference compared with Example 1 is:

[0063] Step 1) Heating: The steel billet is sent to a heating furnace for heating. The 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 controlled at 740°C and the heating time is controlled at 76 minutes; the temperature of the first heating section is controlled at 1150°C and the heating time is controlled at 32 minutes; the temperature of the second heating section is controlled at 1190°C and the heating time is controlled at 50 minutes; the temperature of the soaking section is controlled at 1240°C and the heating time is controlled at 40 minutes. The total heating time is 198 minutes.

[0064] Step 3) Rough rolling: The heated billet is transferred to the roughing mill through a heat-insulating transmission channel, and the billet is rolled in five passes through the roughing mill; the first pass has a reduction rate of 25%; the second pass has a reduction rate of 28.2%; the third pass has a reduction rate of 30.7%; the fourth pass has a reduction rate of 26%; and the fifth pass has a reduction rate of 21.3%.

[0065] Step 5) Finishing rolling: The steel strip is conveyed to the finishing mill through a heat-insulating conveyor channel and rolled using seven stands. The inlet temperature is controlled at 1040°C and the finishing temperature is 1000°C. Grinding devices are installed on both sides of the rollers in the finishing mill to grind the rollers in real time to ensure the flatness of the steel strip.

[0066] Step 10) Pickling: The strip is pickled to remove oxide scale in a pickling mechanism. The pickling process includes a mixed acid stage 1 and a mixed acid stage 2. The mixed acid stage 1 has an HNO3 concentration of 51 g / L, an HF concentration of 8 g / L, a metal ion concentration of 25 g / L, and a temperature of 45°C. The mixed acid stage 2 has an HNO3 concentration of 72 g / L, an HF concentration of 0.5 g / L, a metal ion concentration of 25 g / L, and a temperature of 30°C.

[0067] According to GB / T2054-2013, the mechanical properties of Example 1, Example 2, and Example 3 were tested, and the results are shown in Table 1:

[0068] Table 1:

[0069] Tensile strength Mpa Specified plastic elongation strength MPa Elongation after break % in conclusion Example 1 597 247 33 qualified Example 2 608 245 37 qualified Example 3 601 251 35 qualified

[0070] According to the above standards, the appearance quality inspection of the board and the results are as follows:

[0071] Surface inspection results of Example 1, Example 2, and Example 3: There are no scratches, dents, or other defects on the surface of the N08825 steel strip, and the thickness, width, and other dimensional accuracy of the steel strip are high. Hot rolling produces N08825 coils with stable batches and high pass rate.

[0072] The above content is merely an example and explanation of the structure of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. A process for producing a heavy nickel-based alloy N08825 hot-rolled strip steel, comprising the following steps: 1) Heating: The steel billet is sent to the heating furnace for heating. The heating steps are divided into preheating section, heating section 1, heating section 2, and soaking section. 2) Descaling: Descaling the surface of the billet using high-pressure steam or high-pressure water according to the thickness of the billet; 3) Rough rolling: The heated billet is transferred to the rough rolling mill through the heat-insulating transmission channel, and the billet is rolled in 5 passes through the rough rolling mill; the first pass reduction rate is 20%-25%; the second pass reduction rate is 27%-30%; the third pass reduction rate is 30%-35%; the fourth pass reduction rate is 23%-26%; and the fifth pass reduction rate is 18%-22%; 4) Hot coil box treatment: The steel strip after rough rolling passes through the hot coil box for head change operation to reduce the temperature difference between the head and tail of the steel strip; 5) Finishing rolling: The steel strip is conveyed to the finishing mill through a heat-insulating conveying channel and rolled using seven stands. The inlet temperature is controlled at 970°C-1055°C, and the finishing temperature is >900°C. Grinding devices are installed on both sides of the rollers in the finishing mill to grind the rollers in real time to ensure the flatness of the steel strip. 6) Coiling: The strip after finish rolling enters the coiling mechanism for coiling operation; 7) Uncoiling and welding: The cooled steel coils are unwound through the uncoiling machine and two adjacent groups are welded and fixed by the welding mechanism to facilitate the overall pickling of the steel coils; 8) Annealing: The strip steel is annealed by the annealing mechanism; 9) Scaling shot blasting: The annealed strip steel is shot blasted by a shot blasting machine; 10) Pickling: The strip is pickled to remove the oxide scale through the pickling mechanism; the pickling process includes mixed acid stage one and mixed acid stage two; 11) Cleaning and drying: The pickled strip is cleaned by the cleaning mechanism, and then dried by the drying system before being coiled; The finishing mill is fixedly mounted with support rods at both ends, and a movable frame is movably mounted on the support rods. Both ends of the movable frame are fixedly connected to one end of a hydraulic telescopic rod I, and the other end of the hydraulic telescopic rod I is fixedly mounted on the finishing mill. A telescopic protective cover is movably mounted on the movable frame, and a rack is provided on the outside of the telescopic protective cover, which is meshed with a gear provided at the output end of the motor I. The motor I is fixedly mounted on the movable frame, and the upper and lower ends of the telescopic protective cover are movably mounted on the guide rods respectively, and both ends of the guide rods are fixedly mounted on the support rods. A dust guard plate is movably mounted on the bottom of the telescopic protective cover, one side of the dust guard plate is fixedly connected to one end of a spring, and the other end of the spring is fixedly connected to the telescopic protective cover. A collecting pipe is fixedly connected to the telescopic protective cover on one side of the dust guard plate, and one end of the collecting pipe is connected to a collecting box through a hose, and one side of the collecting box is fixedly connected to a negative pressure fan; A guide frame is movably installed in the telescopic protective cover, one side of the guide frame is fixedly connected to one end of the hydraulic telescopic rod II, and the other end of the hydraulic telescopic rod II is fixedly installed on the telescopic protective cover, and a fine grinding mechanism and a connecting rod are respectively provided on the two sets of oppositely arranged guide frames in the telescopic protective cover, one of which is fixedly installed with a connecting rod at the front end of one group of guide frames, a slide groove is provided on the connecting rod, a clamp is movably installed in the slide groove, one end of the clamp is fixedly installed on the movable plate, and the movable plate is movably installed on the limit plate in engagement with one end of the movable plate, one side of the movable plate is fixedly connected to one end of the hydraulic telescopic rod IV, the other end of the hydraulic telescopic rod IV is fixedly installed on the limit plate, one side of the limit plate is fixedly connected to the hydraulic telescopic rod III, the hydraulic telescopic rod III is fixedly installed on the guide frame, a spline shaft is movably installed on the spline shaft, a grinding roller is movably installed on the spline shaft, an adjusting gear is provided on one side of the spline shaft, the adjusting gear is meshed with a locking rod, one side of the locking rod is fixedly connected to one end of the hydraulic telescopic rod V, and the other end of the hydraulic telescopic rod V is fixedly installed on the connecting rod; During the grinding process, the grinding roller moves as a whole through the movable frame, so that the grinding roller can be close to the roller for grinding. The grinding roller is movably installed on the spline shaft and can slide as a whole but cannot rotate. The clamp is driven by the hydraulic telescopic rod III to engage with the grinding roller. At the same time, the reciprocating extension and retraction of the hydraulic telescopic rod IV can drive the grinding roller to reciprocate along the spline shaft through the clamp.

2. The process for producing a heavy nickel-based alloy N08825 hot-rolled strip according to claim 1, characterized in that The temperature of the preheating section is controlled at 600°C-750°C, and the heating time is controlled at 60min-100min; the temperature of the first heating section is controlled at 1050°C-1150°C, and the heating time is controlled at 25min-45min; the temperature of the second heating section is controlled at 1180°C-1230°C, and the heating time is controlled at 30min-50min; the temperature of the soaking section is controlled at 1200°C-1270°C, and the heating time is controlled at 30min-45min, and the total heating time is 190min-235min.

3. The process for producing a heavy nickel-based alloy N08825 hot-rolled strip according to claim 1, characterized in that The HNO3 concentration in the first mixed acid stage is 45-55g / L, the HF concentration is 6-10g / L, the metal ion concentration is <40g / L, and the temperature is 40-50°C; the HNO3 concentration in the second mixed acid stage is 65-75g / L, the HF concentration is <3g / L, the metal ion concentration is <35g / L, and the temperature is 30-35°C.

4. The process for producing a heavy nickel-based alloy N08825 hot-rolled strip according to claim 1, characterized in that A limit block is provided on one side of the dust shield, and the limit block is fixedly mounted on the telescopic protective cover.

5. The process for producing a heavy nickel-based alloy N08825 hot-rolled strip according to claim 1, characterized in that The fine grinding mechanism includes a guide rack, a movable sleeve, a motor II, a support frame, a motor III, a support roller, and a grinding belt. The guide rack is fixedly installed at the front end of the guide frame, and a movable sleeve is movably installed on the guide rack. Motor II is fixedly installed below the movable sleeve. The gear provided at the output end of motor II is meshed and connected with the guide rack. The support frame is fixedly installed on the movable sleeve. Support rollers are movably installed on both sides of the support frame. A grinding belt is wound around the support rollers. A sprocket provided on one group of support roller rotating shafts is meshed and connected with a sprocket provided at the output end of motor III. Motor III is fixedly installed on the movable sleeve.

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