CN115478144A - A N08800 iron-nickel-based alloy hot continuous rolling coil and its pickling process - Google Patents

Abstract

The invention discloses an N08800 ferronickel base alloy hot continuous rolling coil and an acid cleaning process thereof, and the process comprises the following steps: 1) Preparing a billet to be heated in a heating furnace; 2) Descaling by high-pressure water; 3) Rough rolling: conveying the heated steel billet to a roughing mill through a conveying roller; 4) Finish rolling: the steel plate enters a finish rolling mechanism through transmission; 5) Coiling: after finish rolling, feeding the steel plate into a coiling mechanism for coiling; 6) Uncoiling and welding: welding and fixing two adjacent groups of iron-nickel base alloy plates through a welding mechanism; 7) Annealing: annealing the iron-nickel base alloy plate by an annealing device; 8) Breaking phosphorus and performing shot blasting; performing shot blasting treatment on the annealed iron-nickel-based alloy plate by using a shot blasting machine; 9) Acid washing: pickling the iron-nickel base alloy plate by using a pickling mechanism to remove oxide skins; 10 Cleaning and drying: and cleaning the iron-nickel base alloy plate after acid cleaning by a cleaning mechanism. The invention improves the quality of the N08800 iron nickel base alloy hot continuous rolling semi-coil by using the process.

Description

A N08800 iron-nickel-based alloy hot continuous rolling coil and its pickling process

technical field

The invention belongs to the technical field of iron-nickel-based alloy sheet rolling, and in particular relates to an N08800 iron-nickel-based alloy hot continuous rolling sheet coil and a pickling process thereof.

Background technique

N08800 alloy is a titanium-stabilized Ni-Fe-Cr type iron-nickel-based alloy, which has high high-temperature strength, excellent resistance to high-temperature oxidation, chlorine hypertronic corrosion, and stress corrosion resistance, and can be widely used in industrial heating Furnace equipment, nuclear power plant heat transfer tubes and high-end electric heating tube manufacturing and other fields. The alloy has a high degree of alloying, a narrow range of hot working temperature, poor plasticity, high deformation resistance, and difficult thermoplastic forming of the alloy.

my country's current standard GB/T2054 has similar requirements on the chemical composition and mechanical properties of N08800 as the American Standard ASTM B168, but the regulations on the content of impurity elements are slightly different. This study combines the requirements of the American Standard and the National Standard to control the alloying elements within a narrower range. Within the target range, especially the content of three harmful gas elements, H, O, and N, is strictly controlled.

For the production of N08800 coils, conventional hot rolling has the advantages of high production efficiency, stable batches, high yield and high dimensional accuracy. To improve production efficiency and obtain N08800 hot-rolled pickling coils with better quality data;

1) During annealing, the coils need to be unrolled and enter the annealing furnace for annealing. During the long-distance transmission in the workshop, other debris will fall or adhere to the plate surface. If there are other debris attached to the iron-nickel-based alloy plate, it will It has a great influence on the annealing quality of the plate, and makes a large difference in the annealing effect between the plate with attachments and the plate without attachments, and also includes the surface quality.

2) However, sulfuric acid is often added to the pickling process in the pickling process. At the same time, sulfuric acid is not easy to volatilize, which will affect the pH value of the original solution, and it is easy to cause follow-up pollution. The pickling process can improve the yield and production efficiency and reduce energy consumption.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art, to provide a N08800 iron-nickel-based alloy hot continuous rolling coil and its pickling process, the use of this process improves the quality of N08800 iron-nickel-based alloy hot continuous rolling semi-coil .

In order to achieve the above object, the technical scheme adopted in the present invention is:

A kind of N08800 iron-nickel-based alloy hot rolling coil and its pickling process, the process steps are as follows:

1) Prepare the billet and heat it in the heating furnace. The heating steps are divided into a preheating section, a heating section, a heating section, and a soaking section; in the preheating section, the temperature is controlled at 550-650°C, and the heating time is 80-105min; After the preheating section is completed, enter the heating section for heating, the temperature is controlled at 950-1000 ° C, and the heating time is 30-40 minutes; Enter the soaking section after the second section of heating is completed, the temperature is controlled at 1215-1225°C, the heating time is 140-165min; the total heating time is 260-345min;

2) High-pressure water descaling, through the high-pressure water injection mechanism to remove the oxide skin on the surface of the heated billet;

3) Rough rolling: the heated steel billet is transferred to the rough rolling mill through the transfer roller, and the corresponding heat preservation cover is provided on the transfer device; during rough rolling, the steel billet is rolled 5 times; the reduction rate of one pass is 26-27%; The reduction rate of the second pass is 23-25%; the reduction rate of the third pass is 25-27%; the reduction rate of the fourth pass is 28-30%; the reduction rate of the fifth pass is 18-20%;

4) Finish rolling: After being transported into the finish rolling mechanism, the finish rolling adopts increasing speed rolling, and the finish rolling start temperature is set at 1050-1070°C; the finish rolling end temperature is >800°C;

5) Coiling: After finishing rolling, it is sent to the coiling mechanism for coiling;

6) Uncoiling and welding: welding and fixing two adjacent sets of iron-nickel-based alloy plates by means of a welding mechanism, which is convenient for overall pickling of the iron-nickel-based alloy plates;

7) Annealing: Anneal the iron-nickel-based alloy plate through the annealing device, and then cool it. There is a cleaning device in front of the annealing device. First, clean the surface of the iron-nickel-based alloy plate to prevent the iron-nickel-based alloy plate from passing through the workshop. The transmission of distance causes attachments on the surface to affect the annealing quality;

8) Phosphorus-breaking shot blasting; the annealed iron-nickel-based alloy plate is shot blasted by a shot blasting machine;

9) Pickling: The iron-nickel-based alloy plate is pickled by a pickling mechanism to remove scale; the pickling process has a mixed acid first stage and a mixed acid second stage; the mixed acid first stage has a HNO3 concentration of 50-60g/L and a HF concentration of 4- 8g/L, metal ion<40g/L, temperature 40-60℃; mixed acid second stage HNO3 concentration is 45-60g/L, HF concentration<0.5g/L, metal ion<40g/L, temperature 30-40℃;

10) Cleaning and drying: the pickled iron-nickel-based alloy plate is cleaned by a cleaning mechanism, and then curled after drying the iron-nickel-based alloy plate by a drying system.

In step 7), the cleaning device is arranged on one side of the annealing furnace, and the cleaning device includes a fixed frame, a power mechanism, a bearing frame, and a disc brush; and the bottom, a set of disc brushes is arranged in the bearing frame and is movably connected to the power mechanism; a fixing plate I is arranged at the bottom of the fixing frame.

The power mechanism includes a motor, a mounting frame, a transmission shaft I, a transmission shaft II, a transmission shaft III, a rotating shaft, a gear plate I, a support plate, and a rotating sleeve; the mounting frame is fixed on one side of the fixed frame, and the motor is fixed on the On the mounting frame, the motor shaft passes through the mounting frame and is equipped with a bevel gear. The two ends of the transmission shaft I are connected to the mounting frame by rotation. The two ends of the transmission shaft I and the middle of the transmission shaft I are provided with bevel gears. The middle bevel gear of the transmission shaft I meshes with the motor shaft. End bevel gear; the two ends of the transmission shaft II are fixed on the top of the fixed frame through the bearing seat, and the middle and end of the transmission shaft II are respectively equipped with bevel gears. It is located at the bottom of the fixed frame, and both ends are connected to the fixed frame by rotation. The end and the middle of the transmission shaft III are respectively provided with bevel gears, and the bevel gear at one end of the transmission shaft III meshes with the bevel gear at the end of the transmission shaft I; the rotating shaft passes through the through hole The top of the fixed frame is flexibly connected, and one end of the rotating shaft is provided with a bevel gear and meshes with the bevel gear in the middle section of the transmission shaft II. , and the rotating shaft is fixedly connected by bolts. The rotating sleeves are respectively arranged on both sides of the top plate of the fixed frame. The rotating sleeve is provided with a limit plate and is located on one side of the top plate of the fixed frame. The support plate and the gear plate I are fixed on the other end of the rotating shaft. .

The bearing frame includes a bearing plate and a pressure plate, two ends of the bearing plate are provided with connecting plates and are fixedly connected with a fixing frame, the inner ring of the bearing plate is provided with teeth, and the pressure plate is fixed on the bearing plate by bolts.

The disk brush includes toothed disk II, fixed shaft, fixed disk, connecting plate, connecting rod, adjustment block, threaded rod, and brush; the fixed shaft is provided with a limit plate II; the toothed disk II is fixedly connected to the fixed shaft At one end, the tooth plate II is set on the bearing plate and the supporting plate, the tooth plate II meshes with the tooth plate I and the teeth, the fixed plate is fixedly connected to the other end of the fixed shaft, and there are a number of evenly distributed slots I on the fixed plate; the adjustment There are several blocks and are arranged in the slot I; the brush is plugged into the adjustment block; the center of the connecting plate is provided with a through hole and is sleeved with a fixed shaft; the two ends of the connecting rod are respectively hinged to the adjusting block and the connecting plate; One end of the threaded rod is provided with a through shaft and is rotatably connected to the limit plate II, a rotating sleeve is provided at the through shaft, and the other end of the threaded rod is connected with the connecting plate through threads.

The adjustment block is provided with a slot II, a slot III and a baffle, the depth of the slot III is less than the length of the adjustment block, the brush is plugged into the slot III, and the baffle is plugged into the slot II.

Further, the brush includes a shell, a cover plate, a fixed plate II, a spring, a push block, a bolt, and a guide rod; the spring, the fixed plate II, and the push block are arranged inside the shell, and one end of the shell is provided with an opening; the cover The plate is fixed to one end of the housing by bolts to block the opening; the upper part of the housing is provided with guide columns, the lower part of the housing is provided with a number of through grooves, and supporting plates are arranged on both sides of the through grooves; the fixed plate II is provided with Bristles, the bristles pass through the through groove, and the support plate is supported by the bristles; the spring is sleeved on the guide column, one end of the spring touches the inner wall of the housing, and the other end touches the fixed plate II; one end of the guide rod is provided with a thread, and the guide rod Go through the shell and connect to the fixed plate II through screw thread, and the guide rod is slidably connected to the shell through the through hole; the push blocks are provided with a pair and are respectively arranged on both sides of the fixed plate II, and the push blocks are set on an inclined plane and touch the fixed plate Ⅱ End faces on both sides, one end of the bolt is connected to the push block by rotation, and is connected to the side wall of the shell through threads;

Preferably, a blowpipe is provided at the feed inlet of the annealing furnace.

Compared with the prior art, the present invention has beneficial effects as follows:

1) Drive tooth plate I to rotate through the power mechanism, and drive tooth plate II to rotate, thereby driving the fixed plate and the brush to clean the iron-nickel-based alloy plate; driving the connecting plate to slide up and down by rotating the threaded rod, and then passing the connecting rod Pull the adjustment block to slide along the slot Ⅰ, and then adapt to the cleaning of iron-nickel-based alloy plates of different widths; while the disk brush rotates around the rotation axis, it rotates around the fixed axis, driving the brush to clean more comprehensively;

2) The present invention is provided with a brush that can adjust the length of the bristles in the brush. The spring pushes the fixed plate II and the bristles to slide down along the guide rod. The fixed plate II and the push of the spring make the fixed plate II and the bristles slide up and down, so that the length of the bristles protruding from the support plate can be adjusted, and the extension can be adjusted according to the degree of wear of the bristles; avoiding the long-term cleaning of the iron-nickel-based alloy plate The bristles on the brush wear out quickly during work, so that the replacement and maintenance are more frequent.

Description of drawings

Accompanying drawing 1 is a kind of N08800 iron-nickel-based alloy hot-rolled coil of the present invention and pickling process step 7) in the structural representation of cleaning device;

Accompanying drawing 2 is the structural representation of power mechanism in accompanying drawing 1;

Accompanying drawing 3 is the structural representation of bearing frame in accompanying drawing 1;

Accompanying drawing 4 is the structural representation of part power mechanism in accompanying drawing 3;

Accompanying drawing 5 is the structural representation of dish brush in accompanying drawing 1;

Accompanying drawing 6 is the schematic diagram of the exploded structure of hairbrush in accompanying drawing 4;

Accompanying drawing 7 is the structural representation of hairbrush among accompanying drawing 6;

Accompanying drawing 8 is a schematic diagram of the internal structure of the housing in accompanying drawing 7;

Accompanying drawing 9 is the sectional structure schematic diagram of housing in accompanying drawing 8;

Accompanying drawing 10 is the structural representation of fixed plate II and spring in accompanying drawing 8;

Among the figure: 1, fixed frame; 101, fixed plate I; 2, power mechanism; 201, motor; 202, mounting frame; 203, transmission shaft I; 204, transmission shaft II; 205, transmission shaft III; 206, rotating shaft ; 207, gear plate Ⅰ; 208, support plate; 209, rotating sleeve; 2091, limit plate; 3, bearing frame; 301, bearing plate; 3011, connecting plate; Brush; 401, gear plate II; 402, fixed shaft; 4021, limit plate II; 403, fixed plate; 4031, slot I; 404, connecting plate; 405, connecting rod; 406, adjustment block; 4061, slot Ⅱ; 4062, slot Ⅲ; 4063, baffle; 407, threaded rod; 408, brush; 4081, shell; 40811, support plate; 40812, guide column; Fixed plate II; 40831, bristle; 4084, spring; 4085, push block; 4086, bolt; 4087, guide rod;

detailed description

To facilitate the understanding of those skilled in the art, the technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings 1-10.

Example 1:

A kind of N08800 iron-nickel-based alloy hot rolling coil and its pickling process, the process steps are as follows:

1) Prepare the billet and heat it in the heating furnace. The heating steps are divided into preheating section, heating section 1, heating section 2, and soaking section; in the preheating section, the temperature is controlled at 625°C and the heating time is 95 minutes; the preheating section is completed Then enter the first stage of heating, the temperature is controlled at 1000°C, and the heating time is 35 minutes; after the first stage of heating is completed, enter the second stage of heating, the temperature is controlled at 1208°C, and the heating time is 15 minutes; after the second stage of heating is completed, enter the soaking stage, and the temperature is controlled At 1220°C, the heating time is 155min; the total heating time is 300min;

2) High-pressure water descaling, through the high-pressure water injection mechanism to remove the oxide skin on the surface of the heated billet;

3) Rough rolling: the heated steel billet is transferred to the rough rolling mill through the transfer roller, and the corresponding heat preservation cover is provided on the transfer device; the steel billet is rolled in 5 passes during rough rolling; the reduction rate of one pass is 26.8%; The reduction rate of the first pass is 24.1%; the reduction rate of the third pass is 25.6%; the reduction rate of the fourth pass is 29%; the reduction rate of the fifth pass is 18.8%;

4) Finish rolling: After being transported into the finish rolling mechanism, the finish rolling adopts rising speed rolling, and the finish rolling start temperature is set at 1055°C; the finish rolling end temperature is 950°C;

5) Coiling: After finishing rolling, it is sent to the coiling mechanism for coiling;

6) Uncoiling and welding: welding and fixing two adjacent sets of iron-nickel-based alloy plates by means of a welding mechanism, which is convenient for overall pickling of the iron-nickel-based alloy plates;

7) Annealing: Anneal the iron-nickel-based alloy plate through the annealing device, and then cool it. There is a cleaning device in front of the annealing device. First, clean the surface of the iron-nickel-based alloy plate to prevent the iron-nickel-based alloy plate from passing through the workshop. The transmission of distance causes attachments on the surface to affect the annealing quality;

8) Phosphorus-breaking shot blasting; the annealed iron-nickel-based alloy plate is shot blasted by a shot blasting machine;

9) Pickling: The iron-nickel-based alloy plate is pickled by a pickling mechanism to remove scale; the pickling process has a mixed acid first stage and a mixed acid second stage; the mixed acid first stage has a HNO3 concentration of 62g/L and a HF concentration of 5g/L. The metal ion is 30g/L, the temperature is 45°C; the concentration of HNO3 in the second stage of mixed acid is 48g/L, the concentration of HF is 0.35g/L, the metal ion is 38g/L, and the temperature is 32°C;

10) Cleaning and drying: the pickled iron-nickel-based alloy plate is cleaned by a cleaning mechanism, and then curled after drying the iron-nickel-based alloy plate by a drying system.

In step 7), the cleaning device is arranged on one side of the annealing furnace 7, and the cleaning device includes a fixed frame 1, a power mechanism 2, a carrier frame 3, and a disc brush 4; There is a pair, which are arranged on the top and bottom of the fixed frame 1 respectively. A group of disc brushes 4 are arranged in the carrier frame 3 and are movably connected to the power mechanism 2; the bottom of the fixed frame 1 is provided with a fixed plate I101.

The power mechanism 2 includes a motor 201, a mounting frame 202, a transmission shaft I 203, a transmission shaft II 204, a transmission shaft III 205, a rotating shaft 206, a gear plate I 207, a support plate 208, and a rotating sleeve 209; the mounting frame 202 is fixed on the fixed frame 1- On the side, the motor 201 is fixed on the mounting frame 202 through the motor seat, the shaft of the motor 201 passes through the mounting frame 202 and is provided with a bevel gear, the two ends of the transmission shaft I203 are connected to the mounting frame 202 by rotation, and the two ends of the transmission shaft I203 and the middle of the transmission shaft I203 are arranged There are bevel gears, transmission shaft I 203 intermediate bevel gear meshing motor 201 shaft end bevel gear; transmission shaft II 204 both ends are fixed on the top of fixed frame 1 through bearing seats, the middle and end of transmission shaft II 204 are respectively equipped with bevel gears, transmission shaft II 204 One end of the bevel gear meshes with the bevel gear at the end of the transmission shaft I203, and the transmission shaft III205 is set at the bottom of the fixed frame 1, and both ends are connected to the fixed frame 1 by rotation. The gear meshes with the bevel gear at the end of the transmission shaft I 203; the rotating shaft 206 is flexibly connected to the top of the fixed frame 1 through a through hole, and one end of the rotating shaft 206 is provided with a bevel gear and meshes with the bevel gear in the middle section of the transmission shaft II 204, and the rotating sleeve 209 is located in the through hole at the top of the fixed frame 1, and the rotating sleeve 209 is provided with a pair of respectively socketed rotating shafts 206, and is fixedly connected to the rotating shaft 206 by bolts. 209 is provided with a limit plate 2091 and is located on the side of the top plate of the fixed frame 1. The rotating sleeve 209 realizes the stable rotation of the rotating shaft 206 on the fixed frame 1 and limits the movement of the rotating shaft 206 up and down. The supporting plate 208 and the gear plate I 207 are fixed At the other end of the rotating shaft 206 , the motor 201 provides power to drive the transmission shaft I 203 to rotate, thereby driving the transmission shaft II 204 and the transmission shaft III 205 to rotate and the rotating shaft 206 to rotate.

The carrier frame 3 includes a carrier plate 301 and a pressure plate 302, the two ends of the carrier plate 301 are provided with connecting plates 3011 and are fixedly connected to the fixed frame 1, the inner ring of the carrier plate 301 is provided with teeth 3012, and the pressure plate 302 is fixed on the carrier by bolts. on disk 301.

The disc brush 4 includes a gear plate II 401, a fixed shaft 402, a fixed disc 403, a connecting plate 404, a connecting rod 405, an adjustment block 406, a threaded rod 407, and a brush 408; the fixed shaft 402 is provided with a limit plate II 4021; The tooth plate II 401 is fixedly connected to one end of the fixed shaft 402, the tooth plate II 401 is arranged on the bearing plate 301 and the support plate 208, the tooth plate II 401 meshes with the tooth plate I 207 and the teeth 3012, the fixed plate 403 is fixedly connected to the other end of the fixed shaft 402, and fixed The disc 403 is provided with a number of evenly distributed slots I4031; the adjustment block 406 is provided with several slots I4031; the brush 408 is inserted into the adjustment block 406; the center of the connecting plate 404 is provided with a through hole and set connected to the fixed shaft 402; the two ends of the connecting rod 405 are respectively hinged to the adjustment block 406 and the connecting plate 404; The rotating sleeve at the rotating shaft and the rotating sleeve 209 at the rotating shaft 206 act together to prevent the shaft part of the threaded rod 407 from moving up and down, and the other end of the threaded rod 407 is connected to the connecting plate 404 through threads; Drive toothed disc II 401 to rotate, thereby driving fixed disc 403 and hair brush 408 to brush and clean the iron-nickel-based alloy plate 5; disc brush 4 rotates around the rotating shaft 206 while taking the fixed shaft 402 as the axis to drive the hair Brush 408 for more comprehensive brushing.

The adjustment block 406 is provided with a slot II 4061, a slot III 4062, and a baffle 4063, the depth of the slot III 4062 is less than the length of the adjustment block 406, the brush 408 is plugged into the slot III 4062, and the baffle 4063 is plugged into The slot II 4061 is used to block and fix the brush 408 and facilitate the replacement of the brush 408 .

The connecting plate 404 is driven to slide up and down by turning the threaded rod 407, and then the adjusting block 406 is pulled by the connecting rod 405 to slide along the slot I 4031, thereby adapting to the cleaning of the iron-nickel-based alloy plates 5 of different widths.

A blowpipe 6 is provided at the feed inlet of the annealing furnace 7, and one end of the blowpipe 6 is connected to an external air source through a gas pipe to supply air; the surface of the iron-nickel-based alloy plate 5 brushed by the brush 408 is blown through the blowpipe 6 .

Further, the brush 408 includes a housing 4081, a cover plate 4082, a fixing plate II 4083, a spring 4084, a push block 4085, a bolt 4086, and a guide rod 4087; There is an opening at one end of the housing 4081; the cover plate 4082 is fixed to one end of the housing 4081 by bolts to block the opening; a guide post 40812 is provided above the inside of the housing 4081, and several through grooves 40813 are provided at the bottom of the housing 4081. There are support plates 40811 on both sides of the through groove 40813; bristles 40831 are arranged on the fixed plate II 4083, the bristles 40831 pass through the through groove 40813, and the support plates 40811 are supported by the bristles 40831; the spring 4084 is sleeved on the guide column 40812, One end of the spring 4084 touches the inner wall of the housing 4081, and the other end touches the fixed plate II 4083; one end of the guide rod 4087 is provided with a thread, the guide rod 4087 passes through the housing 4081 and is fixedly connected to the fixed plate II 4083 by the thread, and the guide rod 4087 passes through the through hole The housing 4081 is slidably connected; the push block 4085 is provided with a pair and is respectively arranged on both sides of the fixed plate II 4083, and the push block 4085 is set as an inclined plane and touches the end faces of both sides of the fixed plate II 4083; one end of the bolt 4086 is rotated to connect the push block 4085 , and connect the side wall of the housing 4081 through threads; push the fixed plate II 4083 and the bristles 40831 to slide down along the guide rod 4087 through the spring 4084, push the push block 4085 to slide left and right by turning the bolt 4086, and push the fixed plate through the slope of the push block 4085 Ⅱ 4083 cooperates with the promotion of spring 4084 to make the fixing plate Ⅱ 4083 and the bristles 40831 slide up and down, so that the length of the bristles 40831 protruding from the support plate 40811 can be adjusted according to the degree of wear of the bristles 40831; The bristles 40831 on the brush 408 wear out quickly during the long-term cleaning work, and the disadvantages of frequent replacement and maintenance;

Example 2:

Compared with Example 1, the difference is:

A kind of N08800 iron-nickel-based alloy hot rolling coil and its pickling process, the process steps are as follows:

1) Prepare the billet and heat it in the heating furnace. The heating steps are divided into preheating section, heating section 1, heating section 2, and soaking section; in the preheating section, the temperature is controlled at 635°C and the heating time is 93.5min; After the completion, enter the first stage of heating, the temperature is controlled at 985°C, and the heating time is 32 minutes; after the first stage of heating is completed, enter the second stage of heating, the temperature is controlled at 1210°C, and the heating time is 18 minutes; The temperature is controlled at 1222°C, and the heating time is 160 minutes; the total heating time is 303.5 minutes.

2) High-pressure water descaling, which removes the oxide skin on the surface of the heated billet through a high-pressure water injection mechanism.

3) Rough rolling: the heated steel billet is transferred to the rough rolling mill through the transfer roller, and the corresponding heat preservation cover is provided on the transfer device; the steel billet is rolled in 5 passes during the rough rolling; the reduction rate of one pass is 26.6%; The reduction rate of the second pass is 24.2%; the reduction rate of the third pass is 26.2%; the reduction rate of the fourth pass is 28.5%; the reduction rate of the fifth pass is 19%;

4) Finish rolling: After transmission, it enters the finish rolling mechanism. The finish rolling adopts increasing speed rolling, and the start temperature of finish rolling is set at 1062°C; the end temperature of finish rolling is 980°C.

5) Coiling: After finishing rolling, it is sent to the coiling mechanism for coiling.

6) Uncoiling and welding: The two adjacent groups of iron-nickel-based alloy plates are welded and fixed by a welding mechanism, which is convenient for overall pickling of the iron-nickel-based alloy plates.

7) Annealing: Anneal the iron-nickel-based alloy plate through the annealing device, and then cool it. There is a cleaning device in front of the annealing device. First, clean the surface of the iron-nickel-based alloy plate to prevent the iron-nickel-based alloy plate from passing through the workshop. The transmission of distance causes attachments on the surface to affect the annealing quality.

8) Phosphorus-breaking shot blasting: the annealed iron-nickel-based alloy plate is shot blasted by a shot blasting machine.

9) Pickling: The iron-nickel-based alloy plate is pickled by a pickling mechanism to remove scale; the pickling process has a mixed acid first stage and a mixed acid second stage; the concentration of HNO3 in the mixed acid first stage is 58g/L, and the concentration of HF is 6g/L The metal ion is 35g/L, the temperature is 48°C; the concentration of HNO3 in the second stage of mixed acid is 51g/L, the concentration of HF is 0.4g/L, the metal ion is 35g/L, and the temperature is 38°C.

10) Cleaning and drying: the pickled iron-nickel-based alloy plate is cleaned by a cleaning mechanism, and then curled after drying the iron-nickel-based alloy plate by a drying system.

Embodiment 3: Compared with Embodiment 1, the difference is:

A kind of N08800 iron-nickel-based alloy hot rolling coil and its pickling process, the process steps are as follows:

1) Prepare the billet and heat it in the heating furnace. The heating steps are divided into preheating section, heating section 1, heating section 2, and soaking section; in the preheating section, the temperature is controlled at 606°C and the heating time is 101 minutes; the preheating section is completed Then enter the first stage of heating, the temperature is controlled at 992°C, and the heating time is 40 minutes; after the first stage of heating is completed, enter the second stage of heating, the temperature is controlled at 1212°C, and the heating time is 16 minutes; after the second stage of heating is completed, enter the soaking stage, and the temperature is controlled At 1218°C, the heating time is 158 minutes; the total heating time is 315.5 minutes.

2) High-pressure water descaling, which removes the oxide skin on the surface of the heated billet through a high-pressure water injection mechanism.

3) Rough rolling: the heated steel billet is transferred to the rough rolling mill through the transfer roller, and the corresponding heat preservation cover is provided on the transfer device; the steel billet is rolled in 5 passes during the rough rolling; the reduction rate of one pass is 26.5%; The reduction rate of the first pass is 23.8%; the reduction rate of the third pass is 26.5%; the reduction rate of the fourth pass is 29.5%; the reduction rate of the fifth pass is 19.5%;

4) Finish rolling: After being transported into the finish rolling mechanism, the finish rolling adopts increasing speed rolling, the start temperature of finish rolling is set at 1065°C; the finish rolling end temperature is 1020°C.

5) Coiling: After finishing rolling, it is sent to the coiling mechanism for coiling.

6) Uncoiling and welding: The two adjacent groups of iron-nickel-based alloy plates are welded and fixed by a welding mechanism, which is convenient for overall pickling of the iron-nickel-based alloy plates.

7) Annealing: Anneal the iron-nickel-based alloy plate through the annealing device, and then cool it; there is a cleaning device in front of the annealing device, and first clean the surface of the iron-nickel-based alloy plate to prevent the iron-nickel-based alloy plate from passing through the workshop. The transmission of distance causes attachments on the surface to affect the annealing quality.

8) Phosphorus-breaking shot blasting: the annealed iron-nickel-based alloy plate is shot blasted by a shot blasting machine.

9) Pickling: The iron-nickel-based alloy plate is pickled by a pickling mechanism to remove scale; the pickling process has a mixed acid first stage and a mixed acid second stage; the mixed acid first stage has a HNO3 concentration of 55g/L and a HF concentration of 7g/L. The metal ion is 32g/L, the temperature is 52°C; the concentration of HNO3 in the second stage of mixed acid is 50.5g/L, the concentration of HF is 0.42g/L, the metal ion is 32g/L, and the temperature is 36.5°C.

10) Cleaning and drying: the pickled iron-nickel-based alloy plate is cleaned by a cleaning mechanism, and then curled after drying the iron-nickel-based alloy plate by a drying system.

Comparative example 1: adopt the sheet material rolled by any embodiment in embodiment 1-3, adopt the pickling process in the production process of a kind of N06600 iron-nickel-based alloy hot continuous rolling coil production process that the patent application publication number is CN114737132A to carry out pickling ;

Comparative example 2: using the plate rolled by any embodiment in Examples 1-3, and then adopting the pickling process in a kind of 825 iron-nickel-based alloy hot continuous rolling coil and its preparation process with the patent application publication number CN113621888A pickling;

According to GB/2054-2013, the mechanical properties of the above embodiments were tested, and the test results are shown in the following table:

Tensile strengthMpa Extension strength Mpa Elongation after break% in conclusion Example 1 580 267 30 qualified Example 2 592 268 33 qualified Example 3 595 272 34.5 qualified Comparative example 1 572 256 29 qualified Comparative example 2 575 261 28.5 qualified

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

The surface inspection results of Example 1, Example 2, and Example 3; the surface of the board surface is clean, and there is no peeling, oxide skin, or creasing on the surface of the rear board surface; the surface quality of the rolled iron-nickel-based alloy is good at the same time, and the board shape is square , the edges are neat and without curling.

The surface inspection results of comparative example 1 and comparative example 2: there are no obvious scratches, indentations, pits and other defects on the board surface; there are no cracks or peeling on the surface of the board surface, but there are local darkening, water stains and a small amount of corrugation .

According to the above conclusions, it can be known that the mechanical properties of the test results of the above-mentioned examples and comparative examples all meet the inspection standards of GB/2054-2013; but the surface quality of the plates in Examples 1-3 is better, and the comparative example plates The quality has different degrees of surface darkening.

The above content is only an example and description of the structure of the present invention. Those skilled in the art make various modifications or supplements to the described specific embodiments or replace them in similar ways, as long as they do not deviate from the structure of the invention. Or beyond the scope defined in the claims, all should belong to the protection scope of the present invention.

Claims (9)

1. An N08800 iron-nickel based alloy hot continuous rolling coil and an acid cleaning process thereof are characterized by comprising the following process steps:

1) Preparing a steel billet to be heated in a heating furnace, wherein the heating step is divided into a preheating section, a heating section and a soaking section in sequence;

2) Descaling by high-pressure water, namely removing oxide scales on the surface of the heated billet by a high-pressure water spraying mechanism;

3) Rough rolling: the heated billet is conveyed to a roughing mill through a conveying roller, and a corresponding heat-preserving cover is arranged on a conveying device; carrying out 5-pass rolling on the billet during rough rolling; the reduction rate of one pass is 26-27%; the second pass reduction rate is 23-25%; the three-pass reduction rate is 25-27%; the four-pass reduction rate is 28-30%; the five-pass reduction rate is 18-20%;

4) Finish rolling: the steel is conveyed into a finish rolling mechanism, the finish rolling adopts accelerated rolling, and the finish rolling initial rolling temperature is set to be 1050-1070 ℃; finishing temperature of finish rolling is more than 800 ℃;

5) Coiling: after finish rolling, feeding the rolled steel into a coiling mechanism for coiling;

6) Uncoiling and welding: two adjacent groups of iron-nickel-based alloy plates are welded and fixed through a welding mechanism, so that the iron-nickel-based alloy plates are conveniently subjected to integral acid washing;

7) And (3) annealing: annealing the iron-nickel base alloy plate by an annealing device, then cooling, arranging a cleaning device in front of the annealing device, cleaning the surface of the iron-nickel base alloy plate at first, and avoiding that the surface of the iron-nickel base alloy plate has attachments to influence the annealing quality due to long-distance transmission in a workshop;

8) Breaking phosphorus and performing shot blasting; performing shot blasting treatment on the annealed iron-nickel-based alloy plate by using a shot blasting machine;

9) Acid washing: pickling the iron-nickel base alloy plate by using a pickling mechanism to remove oxide skins; the acid washing process is provided with a first mixed acid section and a second mixed acid section;

10 Cleaning and drying: and cleaning the iron-nickel base alloy plate after acid cleaning through a cleaning mechanism, and then drying the iron-nickel base alloy plate through a drying system and then performing curling treatment.

2. The N08800 Fe-Ni based alloy hot continuous rolled coil and its pickling process of claim 1, wherein the preheating section in step 1) is controlled at 550-650 deg.C for 80-105min; after the preheating section is finished, heating for a first time, wherein the temperature is controlled to be 950-1000 ℃, and the heating time is 30-40min; heating for the first time at 1200-1220 deg.C for 10-20min; after the second heating stage is finished, the mixture enters a soaking stage, the temperature is controlled to be 1215-1225 ℃, and the heating time is 140-165min; the total heating time is 260-345min.

3. The N08800 iron-nickel based alloy hot continuous rolling coil and the acid cleaning process thereof according to claim 1, characterized in that the concentration of HNO3 at the first stage of mixed acid is 50-60g/L, the concentration of HF is 4-8g/L, the metal ion is less than 40g/L, and the temperature is 40-60 ℃; the concentration of the mixed acid two-stage HNO3 is 45-60g/L, the concentration of HF is less than 0.5g/L, the concentration of metal ions is less than 40g/L, and the temperature is 30-40 ℃.

4. The N08800 iron-nickel based alloy hot continuous rolled plate coil and the acid pickling process thereof according to claim 1, wherein the cleaning device in the step 7) comprises a fixed frame, a power mechanism, a bearing frame and a disc brush; the power mechanism is arranged on one side of the fixing frame, the bearing frame is provided with a pair of bearing frames which are respectively arranged at the top and the bottom of the fixing frame, and a group of disc brushes are arranged in the bearing frame and movably connected with the power mechanism; the fixing frame is characterized in that a fixing plate I is arranged at the bottom of the fixing frame.

5. The N08800 iron-nickel based alloy hot continuous rolling coil and the acid pickling process thereof according to claim 4, wherein the power mechanism comprises a motor, a mounting frame, a transmission shaft I, a transmission shaft II, a transmission shaft III, a rotating shaft, a fluted disc I, a supporting plate and a rotating sleeve; the mounting frame is fixed on one side of the mounting frame, the motor is fixed on the mounting frame through the motor base, the motor shaft penetrates through the mounting frame and is provided with a bevel gear, two ends of the transmission shaft I are rotatably connected with the mounting frame, the bevel gears are arranged between two ends of the transmission shaft I and the middle of the transmission shaft I, and the bevel gear in the middle of the transmission shaft I is meshed with the bevel gear at the end of the motor shaft; two ends of a transmission shaft II are fixed at the top of the fixing frame through bearing seats, bevel gears are arranged in the middle and at the end of the transmission shaft II respectively, one end of the transmission shaft II is meshed with the bevel gear at the end of the transmission shaft I, a transmission shaft III is arranged at the bottom of the fixing frame, two ends of the transmission shaft III are rotatably connected with the fixing frame, the bevel gears are arranged at the end and in the middle of the transmission shaft III respectively, and one end of the transmission shaft III is meshed with the bevel gear at the end of the transmission shaft I; the rotating shaft is movably connected with the top of the fixed frame through a through hole, one end of the rotating shaft is provided with a bevel gear and is meshed with the bevel gear at the middle section of the transmission shaft II, the rotating sleeve is arranged in the through hole at the top of the fixed frame, a pair of rotating sleeves are respectively sleeved on the rotating shaft and fixedly connected with the rotating shaft through bolts, the rotating sleeves are respectively arranged on two sides of a top plate of the fixed frame, a limiting plate is arranged on each rotating sleeve and is positioned on one side of the top plate of the fixed frame, and the supporting plate and the fluted disc I are fixed at the other end of the rotating shaft;

the bearing frame comprises a bearing disc and a pressing plate, connecting plates are arranged at two ends of the bearing disc and fixedly connected with a fixing frame, teeth are arranged on the inner ring of the bearing disc, and the pressing plate is fixed on the bearing disc through bolts.

6. The N08800 iron-nickel based alloy hot continuous rolled plate coil and the acid pickling process thereof according to claim 4, wherein the plate brush comprises a fluted disc II, a fixed shaft, a fixed disc, a connecting plate, a connecting rod, an adjusting block, a threaded rod and a brush; a limiting plate II is arranged on the fixed shaft; the fluted disc II is fixedly connected with one end of the fixed shaft, the fluted disc II is arranged on the bearing disc and the supporting plate, the fluted disc II is meshed with the fluted disc I and the teeth, the fixed disc is fixedly connected with the other end of the fixed shaft, and a plurality of uniformly distributed slots I are formed in the fixed disc; the adjusting blocks are provided with a plurality of adjusting blocks and arranged in the slot I; the hairbrush is inserted into the adjusting block; the center of the connecting plate is provided with a through hole and is sleeved with a fixed shaft; two ends of the connecting rod are respectively hinged with the adjusting block and the connecting plate; threaded rod one end is equipped with logical axle and swivelling joint limiting plate II, leads to axle department and is equipped with the rotating sleeve, and the threaded rod other end passes through the screw thread and is connected with the connecting plate.

7. The N08800 iron-nickel based alloy hot continuous rolling coil and the acid pickling process thereof according to claim 6, wherein the adjusting block is provided with a slot II, a slot III and a baffle plate, the depth of the slot III is smaller than the length of the adjusting block, the brush is inserted into the slot III, and the baffle plate is inserted into the slot II.

8. The N08800 iron-nickel based alloy hot continuous rolled plate coil and the pickling process thereof as claimed in claim 6, wherein the brush comprises a housing, a cover plate, a fixing plate II, a spring, a push block, a bolt and a guide rod; the spring, the fixing plate II and the push block are arranged in the shell, and one end of the shell is provided with an opening; the cover plate is fixed at one end of the shell through a bolt to plug the opening; a guide post is arranged above the inside of the shell, a plurality of through grooves are arranged below the inside of the shell, and supporting plates are arranged on two sides of each through groove; the bristles penetrate through the through grooves, and the supporting plate abuts against the bristles to play a supporting role; the spring is sleeved with the guide post, one end of the spring is in contact with the inner wall of the shell, and the other end of the spring is in contact with the fixing plate II; one end of the guide rod is provided with a thread, the guide rod penetrates through the shell and is fixedly connected with the fixing plate II through the thread, and the guide rod is connected with the shell in a sliding mode through a through hole; the ejector pad is equipped with a pair ofly and locates II both sides of fixed plate respectively, and the ejector pad is established to the inclined plane and pushes up II both sides terminal surfaces of fixed plate, bolt one end is rotated and is connected the ejector pad to through threaded connection casing lateral wall.

9. The N08800 iron-nickel based alloy hot continuous rolled plate coil and the acid pickling process thereof according to claim 1, characterized in that a blow pipe is arranged at a feed inlet of the annealing furnace.

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