CN116532477A - Production process of heavy nickel-based alloy N08825 hot continuous rolling strip steel - Google Patents
Production process of heavy nickel-based alloy N08825 hot continuous rolling strip steel Download PDFInfo
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- CN116532477A CN116532477A CN202310639154.4A CN202310639154A CN116532477A CN 116532477 A CN116532477 A CN 116532477A CN 202310639154 A CN202310639154 A CN 202310639154A CN 116532477 A CN116532477 A CN 116532477A
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- strip steel
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- heating
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 80
- 239000010959 steel Substances 0.000 title claims abstract description 80
- 238000005096 rolling process Methods 0.000 title claims abstract description 49
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 24
- 239000000956 alloy Substances 0.000 title claims abstract description 24
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 58
- 239000002253 acid Substances 0.000 claims abstract description 42
- 238000005406 washing Methods 0.000 claims abstract description 21
- 238000000137 annealing Methods 0.000 claims abstract description 10
- 238000004140 cleaning Methods 0.000 claims abstract description 10
- 238000001035 drying Methods 0.000 claims abstract description 10
- 238000003466 welding Methods 0.000 claims abstract description 10
- 238000004321 preservation Methods 0.000 claims abstract description 9
- 238000005098 hot rolling Methods 0.000 claims abstract description 7
- 238000000227 grinding Methods 0.000 claims description 30
- 230000007246 mechanism Effects 0.000 claims description 27
- 239000000428 dust Substances 0.000 claims description 13
- 238000005498 polishing Methods 0.000 claims description 13
- 229910021645 metal ion Inorganic materials 0.000 claims description 10
- 238000002791 soaking Methods 0.000 claims description 10
- 238000005422 blasting Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- UGKDIUIOSMUOAW-UHFFFAOYSA-N iron nickel Chemical compound [Fe].[Ni] UGKDIUIOSMUOAW-UHFFFAOYSA-N 0.000 claims description 6
- 238000002788 crimping Methods 0.000 claims description 3
- 238000005554 pickling Methods 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims 2
- 230000001276 controlling effect Effects 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000002585 base Substances 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- BIJOYKCOMBZXAE-UHFFFAOYSA-N chromium iron nickel Chemical group [Cr].[Fe].[Ni] BIJOYKCOMBZXAE-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B28/00—Maintaining rolls or rolling equipment in effective condition
- B21B28/02—Maintaining rolls in effective condition, e.g. reconditioning
- B21B28/04—Maintaining rolls in effective condition, e.g. reconditioning while in use, e.g. polishing or grinding while the rolls are in their stands
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a production process of heavy nickel-based alloy N08825 hot continuous rolling strip steel, which comprises the following steps: 1) Heating; 2) Descaling; 3) Rough rolling: conveying the heated steel billet to a roughing mill through a heat preservation conveying channel, and carrying out 5-pass rolling on the steel billet through the roughing mill; the one-pass reduction rate is 20% -25%; the second pass reduction rate is 27% -30%; the three-pass reduction rate is 30% -35%; the four-pass reduction rate is 23% -26%; the five-pass reduction rate is 18% -22%; 4) Carrying out hot rolling box treatment; 5) Finish rolling; 6) Coiling; 7) Uncoiling and welding; 8) Annealing; 9) Breaking scales and throwing balls; 10 Acid washing; 11 Cleaning and drying. According to the invention, the N08825 coil is rolled by utilizing a conventional hot continuous rolling production line, so that the energy consumption can be effectively reduced, and the production efficiency and the strip steel stability are improved.
Description
Technical Field
The invention belongs to the technical field of heavy nickel-based alloy N08825 hot continuous rolling, and particularly relates to a production process of heavy nickel-based alloy N08825 hot continuous rolling strip steel.
Background
The N08825 alloy is nickel-chromium-iron alloy with nickel as a matrix, is a high-temperature corrosion-resistant alloy, has strong corrosion resistance to acid and alkali solutions, particularly has stronger stress corrosion resistance in chloride ion solution than other metals, and is widely applied to industries such as shipbuilding, pressure vessels, petrochemical industry, heat exchangers and the like.
Through conventional hot continuous rolling production line, roll N08825 steel billet, the line guarantees that the batch is stable, the N08825 coil of high yield, often the line energy consumption is high, production efficiency is low, even prior art has following problem in rolling N08825 steel billet in-process: 1) In the process of rolling the steel strip by utilizing the finishing mill group, partial oxide skin or other impurities are easily adhered to a roller, and if the roller is not cleaned in time, the surface of the steel strip is subjected to the problems of defects or scratches and the like, so that the surface quality of the steel strip is affected; 2) The existing polishing device causes irregular splashing of scraps in the polishing process of the roller, and the scraps can fly on the surface of the steel belt to enter the next rolling mill set or fly into parts, so that the abrasion of mechanical parts is increased.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a production process of heavy nickel-based alloy N08825 hot continuous rolling strip steel, which is used for hot continuous rolling of N08825 strip coils, so that the energy consumption can be effectively reduced, and the production efficiency and the strip steel stability can be improved.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a production process of heavy nickel-based alloy N08825 hot continuous rolling strip steel comprises the following steps:
1) Heating: the billet is sent into a heating furnace to be heated, the heating step is sequentially 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 to be 600-750 ℃, and the heating time is controlled to be 60-100 min; the temperature of the heating section is controlled to be 1050-1150 ℃ and the heating time is controlled to be 25-45 min; the temperature of the second heating section is controlled to 1180-1230 ℃, and the heating time is controlled to 30-50 min; the temperature of the soaking section is controlled at 1200-1270 ℃, the heating time is controlled at 30-45 min, and the total heating time is 190-235 min.
2) Descaling: descaling the surface of the steel billet by utilizing high-pressure steam or high-pressure water according to the thickness of the steel billet;
3) Rough rolling: conveying the heated steel billet to a roughing mill through a heat preservation conveying channel, and carrying out 5-pass rolling on the steel billet through the roughing mill; the one-pass reduction rate is 20% -25%; the second pass reduction rate is 27% -30%; the three-pass reduction rate is 30% -35%; the four-pass reduction rate is 23% -26%; the five-pass reduction rate is 18% -22%;
4) And (3) hot rolling box treatment: the head of the rough rolled steel strip is replaced through a hot rolling box, so that the head-tail temperature difference of the steel strip is reduced;
5) Finish rolling: conveying the steel strip to a finishing mill through a heat-preservation conveying channel, adopting seven racks for rolling, controlling the inlet temperature to 970-1055 ℃ and finishing the rolling to be higher than 900 ℃; polishing devices are arranged on two sides of a roller in the finishing mill to polish the roller in real time, so that the flatness of the steel belt is ensured;
the two ends of the finishing mill are fixedly provided with supporting rods, movable frames are movably arranged on the supporting rods, two ends of the movable frames are fixedly connected with one end of a hydraulic telescopic rod I, the other end of the hydraulic telescopic rod I is fixedly arranged on the finishing mill, a telescopic protection cover is movably arranged on the movable frames, racks are arranged on the outer sides of the telescopic protection cover and are in meshed connection with gears arranged at the output ends of a motor I, the motor I is fixedly arranged on the movable frames, the upper ends and the lower ends of the telescopic protection cover are respectively and movably arranged on guide rods, the two ends of the guide rods are fixedly arranged on the supporting rods, the upper parts of the telescopic protection covers on the same side are alternately arranged, dust boards are movably arranged at the bottoms, one sides of the dust boards are fixedly connected with one ends of springs, the other ends of the springs are fixedly connected with the telescopic protection covers on one sides of the dust boards, one ends of the collecting pipes are fixedly communicated with a collecting box through hoses, and one sides of the collecting boxes are fixedly communicated with a negative pressure fan;
the hydraulic telescopic protection device is characterized in that a guide frame is movably arranged in the telescopic protection cover, one side of the guide frame is fixedly connected with one end of a hydraulic telescopic rod II, the other end of the hydraulic telescopic rod II is fixedly arranged on the telescopic protection cover, fine grinding mechanisms and connecting rods are respectively arranged on the guide frames in the two groups of opposite telescopic protection covers, the front end of one group of guide frames is fixedly provided with the connecting rods, a sliding groove is formed in the connecting rods, a clamp is movably arranged in the sliding groove, one end of the clamp is fixedly arranged on a movable plate, the movable plate is movably arranged on a limiting plate in a meshed manner, one side of the movable plate is fixedly connected with one end of a hydraulic telescopic rod IV, the other end of the hydraulic telescopic rod IV is fixedly arranged on the limiting plate, one side of the limiting plate is fixedly connected with a hydraulic telescopic rod III, the hydraulic telescopic rod III is fixedly arranged on the guide frame, a spline shaft is movably arranged at the front end of the connecting rods, a grinding roller is movably arranged on the spline shaft, an adjusting gear is meshed with a locking rod, one side of the locking rod is fixedly connected with one end of the hydraulic telescopic rod V, and the other end of the hydraulic telescopic rod V is fixedly arranged on the connecting rod;
the fine grinding mechanism comprises a guide rack, a movable sleeve, a motor II, a support frame, a motor III, support rollers and a grinding belt, wherein the guide rack is fixedly arranged at the front end of the guide frame, the movable sleeve is movably arranged on the guide rack, the motor II is fixedly arranged below the movable sleeve, a gear arranged at the output end of the motor II is meshed with the guide rack to be connected with the movable sleeve, the support frame is fixedly arranged on the movable sleeve, the support rollers are movably arranged at the two sides of the support frame, the grinding belt is wound on the support rollers, a set of chain wheels arranged on the rotating shafts of the support rollers are meshed with the chain wheels arranged at the output end of the motor III, and the motor III is fixedly arranged on the movable sleeve;
a limiting block is arranged on one side of the dust baffle, and is fixedly arranged on the telescopic protective cover, so that the dust baffle is prevented from being overturned at an overlarge angle.
6) And (3) coiling: the finish rolled strip steel enters a coiling mechanism to carry out coiling operation;
7) Uncoiling and welding: unreeling the cooled strip steel coil through an uncoiler, and welding and fixing two adjacent groups through a welding mechanism, so that the whole pickling of the steel plate is facilitated;
8) Annealing: annealing the strip steel through an annealing mechanism;
9) Breaking scales and blasting balls: performing shot blasting treatment on the annealed strip steel by using a shot blasting machine;
10 Acid washing: acid washing is carried out on the strip steel through an acid washing mechanism to remove oxide scales; the acid washing process is provided with a first mixed acid section and a second mixed acid section; mixed acid one-stage HNO 3 The concentration is 45-55g/L, the concentration of HF is 6-10g/L, the concentration of metal ions is less than 40g/L, and the temperature is 40-50 ℃; mixed acid second-stage HNO 3 The concentration is 65-75g/L, the concentration of HF is less than 3g/L, the concentration of metal ions is less than 35g/L, and the temperature is 30-35 ℃;
11 Cleaning and drying: and cleaning the pickled iron-nickel base alloy plate by a cleaning mechanism, and then drying the iron-nickel base alloy plate by a drying system and then carrying out crimping treatment.
Compared with the prior art, the invention has the beneficial effects that:
1) The grinding devices are arranged on two sides of a roller of the finishing mill, the roller is subjected to rough grinding through the grinding rollers, larger particles adhered to the roller are ground completely, and then the roller is subjected to fine grinding through the fine grinding mechanism, so that the smoothness of the surface of the roller is ensured;
2) The grinding roller can be tightly attached to the roller to be ground through the integral movement of the movable frame in the grinding process, meanwhile, the grinding roller is movably installed on the spline shaft and can integrally slide but cannot rotate, the clamp is driven by the hydraulic telescopic rod III to be meshed with the grinding roller, and meanwhile, the reciprocating expansion of the hydraulic telescopic rod IV can drive the grinding roller to reciprocate along the spline shaft through the clamp, so that incomplete grinding caused by increase of local abrasion of the grinding roller is avoided;
3) In the fine grinding mechanism, the motor II drives the movable sleeve to reciprocate along the guide rack, so that two groups of polishing belts on the movable sleeve are driven to polish the polishing roller in a reciprocating and fine mode, and scratch of strip steel such as burrs on the polishing roller is avoided.
4) The piece that falls in polishing in-process can be blocked by flexible safety cover and fly leaf, and the negative pressure fan will fall the piece that falls afterwards and pass through the hose pump along flexible safety cover one side collecting pipe and go into the collecting box in, and the processing is collected in unison, can avoid the piece to splash and get into the wearing and tearing that cause mechanical parts in the mechanical structure.
Drawings
FIG. 1 is a schematic structural diagram of a polishing device in a step 5) of a heavy nickel-based alloy N08825 hot continuous rolling strip steel production process;
FIG. 2 is a schematic side elevational view of the polishing apparatus;
FIG. 3 is a schematic view of a movable frame structure;
FIG. 4 is a schematic view of a telescoping shield structure;
FIG. 5 is a schematic view of the construction of the grinding roller;
FIG. 6 is a schematic diagram of a lock lever structure;
FIG. 7 is a schematic view of a guide rack structure;
FIG. 8 is a schematic view of the refining mechanism;
FIG. 9 is an enlarged view of a portion of FIG. 4 at A;
in the figure: 11. Finishing mill; 12. a support rod; 13. a movable frame; 14. a hydraulic telescopic rod I; 15. a telescoping protective cover; 16. a motor I; 17. a connecting rod; 18. a fine grinding mechanism; 19. a collection box; 20. a negative pressure fan; 121. a guide rod; 151. a rack; 152. a hydraulic telescopic rod II; 153. a guide frame; 154. a dust-blocking plate; 1541. a limiting block; 155. a spring; 156. a collection pipe; 171. a chute; 172. a hydraulic telescopic rod III; 173. a limiting plate; 174. a movable plate; 175. a hydraulic telescopic rod IV; 176. a clamp; 177. a grinding roller; 178. a spline shaft; 1781. an adjusting gear; 179. a locking lever; 1791. a hydraulic telescopic rod V; 181. a guide rack; 182. a movable sleeve; 183. a motor II; 184. a support frame; 185. a motor III; 186. a support roller; 187. and (5) polishing the belt.
Detailed Description
In order to facilitate understanding of those skilled in the art, the technical scheme of the present invention will be further specifically described below with reference to fig. 1 to 9.
Example 1:
a production process of heavy nickel-based alloy N08825 hot continuous rolling strip steel comprises the following steps:
1) Heating: the billet is sent into a heating furnace to be heated, the heating step is sequentially 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 660 ℃, and the heating time is controlled at 88min; heating a first section of the material at 1080 ℃ for 40min; the temperature of the second heating stage is controlled at 1220 ℃, and the heating time is controlled at 42min; the temperature of the soaking section is controlled to 1260 ℃, the heating time is controlled to 38min, and the total heating time is 208min.
2) Descaling: descaling the surface of the steel billet by utilizing high-pressure steam or high-pressure water according to the thickness of the steel billet;
3) Rough rolling: conveying the heated steel billet to a roughing mill through a heat preservation conveying channel, and carrying out 5-pass rolling on the steel billet through the roughing mill; the one-pass reduction rate is 21.8%; the second pass reduction rate is 27.3%; the three-pass reduction rate is 32.5%; the four-pass reduction rate is 24.7%; the five-pass reduction rate is 18.5%;
4) And (3) hot rolling box treatment: the head of the rough rolled steel strip is replaced through a hot rolling box, so that the head-tail temperature difference of the steel strip is reduced;
5) Finish rolling: conveying the steel strip to a finishing mill through a heat-preservation conveying channel, adopting seven racks for rolling, controlling the inlet temperature to 980 ℃ and finishing the finish rolling to 950 ℃; polishing devices are arranged on two sides of a roller in the finishing mill to polish the roller in real time, so that the flatness of the steel belt is ensured;
the two ends of the finishing mill 11 are fixedly provided with support rods 12, the support rods 12 are movably provided with movable frames 13, two ends of each movable frame 13 are fixedly connected with one end of a hydraulic telescopic rod I14, the other end of each hydraulic telescopic rod I14 is fixedly arranged on the finishing mill 11, each movable frame 13 is movably provided with a telescopic protection cover 15, the outer side of each telescopic protection cover 15 is provided with a rack 151, each rack 151 is meshed with a gear arranged at the output end of each motor I16, each motor I16 is fixedly arranged on each movable frame 13, the upper end and the lower end of each telescopic protection cover 15 are respectively movably arranged on a guide rod 121, two ends of each guide rod 121 are fixedly arranged on the support rods 12, the telescopic protection covers 15 on the same side are alternately arranged, the bottoms of the telescopic protection covers 15 are movably provided with dust plates 154, one side of each dust plate 154 is fixedly connected with one end of a spring 155, the other end of each spring 155 is fixedly connected with the telescopic protection cover 15, one end of each collecting pipe 156 is fixedly communicated with a collecting box 19 through a hose, and one side of each collecting box 19 is fixedly communicated with a negative pressure fan 20;
the guide frames 153 are movably arranged in the telescopic protection cover 15, one side of the guide frames 153 is fixedly connected with one end of the hydraulic telescopic rod II 152, the other end of the hydraulic telescopic rod II 152 is fixedly arranged on the telescopic protection cover 15, the front ends of the two groups of the guide frames 153 in the telescopic protection cover 15 which are oppositely arranged are respectively provided with the accurate grinding mechanism 18 and the connecting rod 17, the front ends of one group of the guide frames 153 are fixedly provided with the connecting rods 17, the connecting rods 17 are provided with the sliding grooves 171, the clamping rings 176 are movably arranged in the sliding grooves 171, one end of the clamping rings 176 is fixedly arranged on the movable plates 174, the movable plates 174 are movably arranged on the limiting plates 173 in a meshing manner, one side of the movable plates 174 is fixedly connected with one end of the hydraulic telescopic rod IV 175, the other end of the hydraulic telescopic rod IV 175 is fixedly arranged on the limiting plates 173, one side of the limiting plates 173 is fixedly connected with the hydraulic telescopic rod III 172, the hydraulic telescopic rod III 172 is fixedly arranged on the guide frames 153, the front ends of the connecting rods 17 are movably provided with the spline shafts 178, the spline shafts 178 are movably provided with the beating rollers 177, one side of the spline shafts 178 are fixedly provided with the adjusting gears 1781, the adjusting gears 1781 are meshed with the locking rods 179, one side of the hydraulic telescopic rods 1791, one end of the hydraulic telescopic rods 1791 is fixedly connected with the other end of the hydraulic telescopic rods 1791, and the other end of the hydraulic telescopic rods 1791 are fixedly arranged on the connecting rods 1717;
the fine grinding mechanism 18 comprises a guide rack 181, a movable sleeve 182, a motor II 183, a support frame 184, a motor III 185, support rollers 186 and a grinding belt 187, wherein the guide rack 181 is fixedly arranged at the front end of the guide rack 153, the movable sleeve 182 is movably arranged on the guide rack 181, the motor II 183 is fixedly arranged below the movable sleeve 182, a gear arranged at the output end of the motor II 183 is meshed with the guide rack 181 to be connected with the movable sleeve 182, the support frame 184 is fixedly arranged on the movable sleeve 182, the support rollers 186 are movably arranged at two sides of the support frame 184, the grinding belt 187 is wound on the support rollers 186, a chain wheel arranged on the rotating shaft of one group of support rollers 186 is meshed with a chain wheel arranged at the output end of the motor III 185, and the motor III 185 is fixedly arranged on the movable sleeve 182;
a limiting block 1541 is arranged on one side of the dust plate 154, and the limiting block 1541 is fixedly arranged on the telescopic protection cover 15 to prevent the dust plate 154 from being overturned at an overlarge angle.
6) And (3) coiling: the finish rolled strip steel enters a coiling mechanism to carry out coiling operation;
7) Uncoiling and welding: unreeling the cooled strip steel coil through an uncoiler, and welding and fixing two adjacent groups through a welding mechanism, so that the whole pickling of the steel plate is facilitated;
8) Annealing: annealing the strip steel through an annealing mechanism;
9) Breaking scales and blasting balls: performing shot blasting treatment on the annealed strip steel by using a shot blasting machine;
10 Acid washing: acid washing is carried out on the strip steel through an acid washing mechanism to remove oxide scales; the acid washing process is provided with a first mixed acid section and a second mixed acid section; mixed acid one-stage HNO 3 The concentration is 46g/L, the concentration of HF is 6g/L, the concentration of metal ions is 30g/L, and the temperature is 40 ℃;mixed acid second-stage HNO 3 The concentration is 68g/L, the concentration of HF is 1g/L, the concentration of metal ions is 20g/L, and the temperature is 32 ℃;
11 Cleaning and drying: and cleaning the pickled iron-nickel base alloy plate by a cleaning mechanism, and then drying the iron-nickel base alloy plate by a drying system and then carrying out crimping treatment.
Example 2:
the difference compared with example 1 is that:
step 1) heating: the billet is sent into a heating furnace to be heated, the heating step is sequentially 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 ℃, and the heating time is controlled at 83min; heating a section of temperature at 1130 ℃ for 39min; the temperature of the second heating stage is controlled at 1200 ℃, and the heating time is controlled at 48min; the temperature of the soaking section is controlled at 1230 ℃, the heating time is controlled at 41min, and the total heating time is 211min.
Step 3) rough rolling: conveying the heated steel billet to a roughing mill through a heat preservation conveying channel, and carrying out 5-pass rolling on the steel billet through the roughing mill; the one-pass reduction rate is 23.6%; the second pass reduction is 29.2%; the three-pass reduction rate is 34.1%; the four-pass reduction rate is 25.2%; the five-pass reduction rate is 19.8%;
step 5) finish rolling: conveying the steel strip to a finishing mill through a heat-preserving conveying channel, adopting seven racks for rolling, controlling the inlet temperature at 1040 ℃ and the finishing temperature at 1000 ℃; polishing devices are arranged on two sides of a roller in the finishing mill to polish the roller in real time, so that the flatness of the steel belt is ensured;
step 10) acid washing: acid washing is carried out on the strip steel through an acid washing mechanism to remove oxide scales; the acid washing process is provided with a first mixed acid section and a second mixed acid section; mixed acid one-stage HNO 3 The concentration is 51g/L, the concentration of HF is 8g/L, the concentration of metal ions is 25g/L, and the temperature is 45 ℃; mixed acid second-stage HNO 3 The concentration is 72g/L, the concentration of HF is 0.5g/L, the concentration of metal ions is 25g/L, and the temperature is 30 ℃;
example 3:
the difference compared with example 1 is that:
step 1) heating: the billet is sent into a heating furnace to be heated, the heating step is sequentially 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 to be 740 ℃, and the heating time is controlled to be 76min; heating a section of temperature at 1150 ℃ for 32min; the temperature of the second heating stage is controlled at 1190 ℃, and the heating time is controlled at 50min; the temperature of the soaking section is controlled at 1240 ℃, the heating time is controlled at 40min, and the total heating time is 198min.
Step 3) rough rolling: conveying the heated steel billet to a roughing mill through a heat preservation conveying channel, and carrying out 5-pass rolling on the steel billet through the roughing mill; the one-pass reduction rate is 25%; the second pass reduction is 28.2%; the three-pass reduction rate is 30.7%; the four-pass reduction rate is 26%; the five-pass reduction rate is 21.3%;
step 5) finish rolling: conveying the steel strip to a finishing mill through a heat-preserving conveying channel, adopting seven racks for rolling, controlling the inlet temperature at 1040 ℃ and the finishing temperature at 1000 ℃; polishing devices are arranged on two sides of a roller in the finishing mill to polish the roller in real time, so that the flatness of the steel belt is ensured;
step 10) acid washing: acid washing is carried out on the strip steel through an acid washing mechanism to remove oxide scales; the acid washing process is provided with a first mixed acid section and a second mixed acid section; mixed acid one-stage HNO 3 The concentration is 51g/L, the concentration of HF is 8g/L, the concentration of metal ions is 25g/L, and the temperature is 45 ℃; mixed acid second-stage HNO 3 The concentration is 72g/L, the concentration of HF is 0.5g/L, the concentration of metal ions is 25g/L, and the temperature is 30 ℃;
mechanical property detection is carried out on the example 1, the example 2 and the example 3 according to GB/T2054-2013, and the obtained results are shown in the table I:
table one:
| tensile strength Mpa | Specified plastic elongation strength Mpa | Elongation after break% | Conclusion(s) | |
| Example 1 | 597 | 247 | 33 | Qualified product |
| Example 2 | 608 | 245 | 37 | Qualified product |
| Example 3 | 601 | 251 | 35 | Qualified product |
The appearance quality of the plate is checked according to the above standard and the result is as follows:
surface inspection results of example 1, example 2, example 3; the surface of the N08825 strip steel has no defects of scratches, depressions and the like, the thickness, the width and other dimensional accuracy of the strip steel are high, and the hot continuous rolling produces N08825 strip coils with stable batches and high qualification rate.
The foregoing is merely illustrative and explanatory of the invention, as it is well within the scope of the invention as claimed, as it relates to various modifications, additions and substitutions for those skilled in the art, without departing from the inventive concept and without departing from the scope of the invention as defined in the accompanying claims.
Claims (7)
1. A production process of heavy nickel-based alloy N08825 hot continuous rolling strip steel comprises the following steps:
1) Heating: the billet is sent into a heating furnace to be heated, and the heating step is sequentially divided into a preheating section, a first heating section, a second heating section and a soaking section;
2) Descaling: descaling the surface of the steel billet by utilizing high-pressure steam or high-pressure water according to the thickness of the steel billet;
3) Rough rolling: conveying the heated steel billet to a roughing mill through a heat preservation conveying channel, and carrying out 5-pass rolling on the steel billet through the roughing mill; the one-pass reduction rate is 20% -25%; the second pass reduction rate is 27% -30%; the three-pass reduction rate is 30% -35%; the four-pass reduction rate is 23% -26%; the five-pass reduction rate is 18% -22%;
4) And (3) hot rolling box treatment: the head of the rough rolled steel strip is replaced through a hot rolling box, so that the head-tail temperature difference of the steel strip is reduced;
5) Finish rolling: conveying the steel strip to a finishing mill through a heat-preservation conveying channel, adopting seven racks for rolling, controlling the inlet temperature to 970-1055 ℃ and finishing the rolling to be higher than 900 ℃; polishing devices are arranged on two sides of a roller in the finishing mill to polish the roller in real time, so that the flatness of the steel belt is ensured;
6) And (3) coiling: the finish rolled strip steel enters a coiling mechanism to carry out coiling operation;
7) Uncoiling and welding: unreeling the cooled strip steel coil through an uncoiler, and welding and fixing two adjacent groups through a welding mechanism, so that the whole pickling of the steel plate is facilitated;
8) Annealing: annealing the strip steel through an annealing mechanism;
9) Breaking scales and blasting balls: performing shot blasting treatment on the annealed strip steel by using a shot blasting machine;
10 Acid washing: acid washing is carried out on the strip steel through an acid washing mechanism to remove oxide scales; the acid washing process is provided with a first mixed acid section and a second mixed acid section;
11 Cleaning and drying: and cleaning the pickled iron-nickel base alloy plate by a cleaning mechanism, and then drying the iron-nickel base alloy plate by a drying system and then carrying out crimping treatment.
2. The production process of the heavy nickel-base alloy N08825 hot continuous rolling strip steel according to claim 1, which is characterized in that the temperature of the preheating section is controlled to be 600-750 ℃ and the heating time is controlled to be 60-100 min; the temperature of the heating section is controlled to be 1050-1150 ℃ and the heating time is controlled to be 25-45 min; the temperature of the second heating section is controlled to 1180-1230 ℃, and the heating time is controlled to 30-50 min; the temperature of the soaking section is controlled at 1200-1270 ℃, the heating time is controlled at 30-45 min, and the total heating time is 190-235 min.
3. The process for producing a heavy nickel-base alloy N08825 hot continuous rolling strip steel according to claim 1, wherein the process is characterized in that the mixed acid is a section of HNO 3 The concentration is 45-55g/L, the concentration of HF is 6-10g/L, the concentration of metal ions is less than 40g/L, and the temperature is 40-50 ℃; mixed acid second-stage HNO 3 The concentration is 65-75g/L, the concentration of HF is less than 3g/L, the concentration of metal ions is less than 35g/L, and the temperature is 30-35 ℃.
4. The production process of the heavy nickel-base alloy N08825 hot continuous rolling strip steel is characterized in that support rods are fixedly arranged at two ends of a finishing mill, a movable frame is movably arranged on the support rods, two ends of the movable frame are fixedly connected with one end of a hydraulic telescopic rod I, the other end of the hydraulic telescopic rod I is fixedly arranged on the finishing mill, a telescopic protection cover is movably arranged on the movable frame, a rack is arranged on the outer side of the telescopic protection cover and is meshed with a gear arranged at the output end of a motor I, the motor I is fixedly arranged on the movable frame, the upper end and the lower end of the telescopic protection cover are respectively and movably arranged on guide rods, two ends of the guide rods are fixedly arranged on the support rods, the upper parts of the telescopic protection covers on the same side are alternately arranged, dust plates are movably arranged at the bottoms of the two ends of the guide rods, one side of each dust plate is fixedly connected with one end of a spring, the other end of each spring is fixedly connected with the telescopic protection cover, one side of each dust plate is fixedly communicated with a collecting pipe, one end of each collecting pipe is communicated with a collecting box through a hose, and one side of the collecting box is fixedly communicated with a negative pressure fan.
5. The production process of the heavy nickel-base alloy N08825 hot continuous rolling strip steel is characterized in that a guide frame is movably installed in the telescopic protection cover, one side of the guide frame is fixedly connected with one end of a hydraulic telescopic rod II, the other end of the hydraulic telescopic rod II is fixedly installed on the telescopic protection cover, fine grinding mechanisms and connecting rods are respectively arranged on the guide frames in the two groups of the telescopic protection cover which are oppositely arranged, the connecting rods are fixedly installed at the front ends of one group of the guide frames, sliding grooves are formed in the connecting rods, clamping hoops are movably installed in the sliding grooves, one ends of the clamping hoops are fixedly installed on a movable plate, the movable plate is meshed and movably installed on a limiting plate, one side of the movable plate is fixedly connected with one end of a hydraulic telescopic rod IV, the other end of the hydraulic telescopic rod IV is fixedly installed on the limiting plate, one side of the limiting plate is fixedly connected with a hydraulic telescopic rod III, the front end of the connecting rod is movably installed with a spline shaft, a grinding roller is movably installed on the spline shaft, one side of the spline shaft is provided with a regulating gear, the regulating gear is meshed with a locking rod, one side of the hydraulic telescopic rod V is fixedly connected with one end of the connecting rod, and the other end of the hydraulic telescopic rod V is fixedly installed on the connecting rod.
6. The process for producing the heavy nickel-base alloy N08825 hot continuous rolling strip steel according to claim 4, wherein a limiting block is arranged on one side of the dust baffle plate, and the limiting block is fixedly arranged on the telescopic protective cover.
7. The process for producing the heavy nickel-base alloy N08825 hot continuous rolling strip steel according to claim 5, wherein the fine grinding mechanism comprises a guide rack, a movable sleeve, a motor II, a support frame, a motor III, a support roller and a grinding belt, wherein the guide rack is fixedly arranged at the front end of the guide frame, the movable sleeve is movably arranged on the guide rack, the motor II is fixedly arranged below the movable sleeve, the support frame is fixedly arranged on the movable sleeve in meshed connection with the gear arranged at the output end of the motor II, the support rollers are movably arranged on two sides of the support frame, the grinding belt is wound on the support roller, a set of chain wheels arranged on the rotating shaft of the support roller are in meshed connection with the chain wheels arranged at the output end of the motor III, and the motor III is fixedly arranged on the movable sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310639154.4A CN116532477A (en) | 2023-06-01 | 2023-06-01 | Production process of heavy nickel-based alloy N08825 hot continuous rolling strip steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310639154.4A CN116532477A (en) | 2023-06-01 | 2023-06-01 | Production process of heavy nickel-based alloy N08825 hot continuous rolling strip steel |
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| CN202310639154.4A Pending CN116532477A (en) | 2023-06-01 | 2023-06-01 | Production process of heavy nickel-based alloy N08825 hot continuous rolling strip steel |
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| CN (1) | CN116532477A (en) |
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