High-silicon nickel-based alloy cold-rolled plate and preparation process thereof

Abstract

The application discloses a high-silicon nickel-based alloy cold-rolled plate and a preparation process thereof, and belongs to the technical field of alloys. The preparation process comprises the following steps: weighing raw materials, pre-compounding, smelting, casting, blooming and forging, segmented cold-rolling compounding and straightening. The application not only significantly improves the Erichsen cupping value and the elongation after fracture of the plate, so that the material can withstand a larger plastic deformation in the stamping forming process without being prone to cracking defects, but also greatly reduces the mass loss rate of the plate in different corrosive media such as NaOH solution, NaCl solution and H2SO4 solution. No matter in an alkaline, neutral or acidic corrosive environment, a stable corrosion-resistant protective layer can be formed, and the corrosion resistance of the material is significantly strengthened.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of alloys, in particular to a high-silicon nickel-based alloy cold-rolled plate and a preparation process thereof. BACKGROUND

[0002] The high-silicon nickel-based alloy cold-rolled plate has irreplaceable application value in many fields such as chemical industry, ocean, energy and the like due to excellent corrosion resistance, and in order to further improve the corrosion resistance of the alloy to adapt to more severe service environments, the industry generally adopts a technical means of increasing the silicon content in the alloy.

[0003] However, while pursuing high silicon content to strengthen corrosion resistance, a series of processing problems are caused, for example, high silicon content will cause the forming performance of the alloy to deteriorate, and the plastic deformation capacity of the material is difficult to match the processing demand during subsequent bending, stamping and other complex part processing procedures.

[0004] In addition, high silicon content will significantly increase the deformation resistance of the nickel-based alloy during cold rolling processing, which will hinder the rolling operation, not only requiring more rolling power, but also easily leading to out-of-control of the shape of the rolled piece, increasing the operation burden in the rolling process.

[0005] Therefore, the technical personnel in the field are committed to developing a high-silicon nickel-based alloy cold-rolled plate and a preparation process thereof. SUMMARY

[0006] In view of the above defects of the prior art, the technical problems to be solved by the present application are that high silicon content will cause the forming performance of the alloy to deteriorate, and high silicon content will significantly increase the deformation resistance of the nickel-based alloy during cold rolling processing, which will hinder the rolling operation.

[0007] To achieve the above-mentioned purpose, the present application provides a preparation process of a high-silicon nickel-based alloy cold-rolled plate, comprising the following steps:

[0008] S1: weighing raw materials;

[0009] 4.3-4.8% silicon powder, 0.06-0.12% niobium powder, 18.5-20.0% chromium block, 4.0-5.5% iron block, 2.0-2.8% molybdenum block, and the rest is nickel block;

[0010] S2: pre-compounding;

[0011] The silicon powder and niobium powder are dry mixed to obtain a dry mixture; NaCl and KCl are mixed and heated to obtain a molten salt bath; the dry mixture is put into the molten salt bath for heat preservation, and after cooling, the composite powder particles are fished out, washed and filtered to obtain a composite powder;

[0012] S3: smelting;

[0013] adding nickel blocks, chromium blocks, iron blocks and molybdenum blocks into a vacuum induction furnace, vacuumizing, heating to 1420-1460 DEG C, stirring and keeping warm, adding the composite powder in batches, and continuously keeping warm to obtain a melt;

[0014] S4: casting;

[0015] After the melt is discharged from the furnace, it is cast into a mold, and a cast ingot is obtained after cooling;

[0016] S5: cogging forging;

[0017] The cast ingot is heated and kept warm, and is first forged into a square blank, and is forged into a wide slab blank by adopting light pressing-heavy pressing-light pressing three-section alternating forging;

[0018] S6: segmented cold rolling compounding;

[0019] After the wide slab blank is milled, it is heated and kept warm, and a cold slab blank is obtained after cooling; a semi-finished material plate is obtained by one-stage cold rolling; and after intermediate annealing, two-stage cold rolling is carried out by adopting a variable roll gap;

[0020] S7: straightening;

[0021] A high-silicon nickel-based alloy cold-rolled plate is obtained by adopting a multi-roll continuous straightening process.

[0022] In the preferred embodiment of the present application, S2 is specifically: the silicon powder and the niobium powder are dry mixed at 100-150 r / min for 10-15 min to obtain a dry mixed material;

[0023] NaCl and KCl are mixed at a mass ratio of 0.8-1.5:1, heated to 700-750 DEG C to obtain a molten salt bath;

[0024] The dry mixed material is put into the molten salt bath at a speed of 0.2-0.3 kg / min, and the salt bath is stirred at a speed of 50-80 r / min, after all the dry mixed material is added, it is kept warm for 15-20 min, the molten salt bath is naturally cooled to 200-250 DEG C, the filter screen is immersed in the molten salt bath, the filter screen is lifted, and the filter screen is drained for 10-20 min, then it is poured into deionized water, stirred and washed for 5-8 min, filtered, and dried at 100-120 DEG C for 2-3 h to obtain a composite powder.

[0025] In another preferred embodiment of the present application, S3 is specifically: nickel blocks, chromium blocks, iron blocks and molybdenum blocks are added into a vacuum induction furnace, vacuumized to ≤5 Pa, heated to 1420-1460 DEG C at a rate of 5-10 DEG C / min, stirred at a rate of 100-120 r / min and kept warm for 30-40 min, the composite powder is added in 3-5 portions through a furnace top charging device, each time interval is 2-3 min, the rotating speed is kept unchanged, and continuously kept warm for 40-50 min to obtain a melt.

[0026] In another preferred embodiment of the present application, S4 is specifically as follows: after the molten metal is discharged, it is cast into a mold, cooled to 800-850℃ at a speed of 20-30℃ / min, and then cooled to room temperature in the furnace to obtain an ingot.

[0027] In another preferred embodiment of the present application, S5 is specifically as follows: the ingot is heated to 1060-1090℃ at a speed of 6-8℃ / min, held for 200-250min, pressed by a fast forging machine, the single hammer reduction of the first heating is 50-70mm, and a square blank is forged, the square blank is heated to 1070-1100℃ at a speed of 2-5℃ / min, held for 120-150min, and then forged into a wide slab by light pressure-heavy pressure-light pressure three-stage alternating forging.

[0028] In another preferred embodiment of the present application, the light pressure-heavy pressure-light pressure three-stage alternating forging step is specifically as follows: the square blank heated to 1070-1100℃ is first subjected to light pressure operation in the first heating, the single hammer reduction is 15-20mm, the forging speed is 0.1-0.2m / s, 2-3 passes of forging are performed, and the deformation is 10-15%, so that the square blank is preliminarily shaped.

[0029] Then, when the blank is naturally cooled to 1050-1080℃, heavy pressure is performed, the single hammer reduction is increased to 35-45mm, the forging speed is increased to 0.3-0.5m / s, 1-2 passes of forging are performed, and the deformation is 30-35%;

[0030] When the blank is further cooled to 1020-1050℃, light pressure is performed, the single hammer reduction is 10-15mm, the forging speed is decreased to 0.1-0.2m / s, 1-2 passes of forging are performed, and the deformation is 5-10%.

[0031] In another preferred embodiment of the present application, S6 is specifically as follows: after the wide slab is subjected to face milling, it is heated to 570-610℃ at a speed of 10-20℃ / min under the protection of inert gas, held for 10-16h, cooled to room temperature in the furnace, and a cold slab is obtained.

[0032] First-stage cold rolling: the slab is sent into a cold rolling mill, the deformation is 35-40%, the rolling speed is 0.2-0.4m / s, small tension control is adopted, and the tension value is 50-80MPa, so that a semi-finished plate is obtained.

[0033] Intermediate annealing: the semi-finished plate is heated to 810-860℃, held for 30-50s, and then water quenched.

[0034] Second-stage cold rolling: the semi-finished plate after annealing is heated to 120-160℃, the deformation is 40-45%, the rolling speed is 0.3-0.5m / s, and variable roll gap rolling is adopted.

[0035] In another preferred embodiment of the present application, S7 is specifically: using a multi-roll continuous drawing and straightening process, the tension of the inlet section is 220-250 MPa, the tension of the straightening section is 280-320 MPa, and the tension of the outlet section is 230-260 MPa; the plate is placed for 10-15 min after drawing and straightening, and a high-silicon nickel-based alloy cold-rolled plate is obtained.

[0036] In another preferred embodiment of the present application, the straightening roller is selected to have a specification of φ80-100 mm, and the roller speed is 0.3-0.6 m / s, wherein the roller speed of the straightening section is 0.03-0.05 m / s higher than that of the inlet section and the outlet section.

[0037] A high-silicon nickel-based alloy cold-rolled plate prepared according to the preparation process.

[0038] The process provided by the present application has the following technical effects:

[0039] 1. The present application uses a molten salt bath blending process to fully fuse the silicon powder and the niobium powder and form a composite powder with uniform dispersion, thereby avoiding powder agglomeration. Not only does this significantly improve the Erichsen cupping value and the elongation after fracture of the plate, allowing the material to withstand a larger degree of plastic deformation during stamping forming without being prone to cracking defects, but also significantly reduces the mass loss rate of the plate in different corrosion media such as NaOH solution, NaCl solution, and H2SO4 solution. In both alkaline, neutral, and acidic corrosion environments, a stable corrosion-resistant protective layer is formed, significantly enhancing the corrosion resistance of the material.

[0040] 2. The present application uses a light pressing-heavy pressing-light pressing three-section alternating forging process in the cogging forging step, which not only effectively promotes the densification of the blank structure but also fully releases the internal stress generated during forging. The Erichsen cupping value, elongation after fracture, and reduction of area of the plate are all comprehensively and significantly improved, and the overall plasticity and deformation compatibility of the material are significantly optimized. DETAILED DESCRIPTION

[0041] The embodiments of the present application are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the disclosure. The present application can also be implemented or applied in different specific embodiments, and various modifications or changes can be made to the details in the specification without departing from the spirit of the present application. It should be noted that the following examples and features in the examples can be combined with each other without conflict.

[0042] Example 1: The present embodiment provides a preparation process for a high-silicon nickel-based alloy cold-rolled plate, including the following steps:

[0043] S1: weighing the raw materials;

[0044] 4.8% silicon powder (particle size 50-80 μm), 0.12% niobium powder (particle size 40-50 μm), 20.0% chromium block, 5.5% iron block, 2.8% molybdenum block, and the rest nickel block;

[0045] S2: pre-compounding;

[0046] The silicon powder and the niobium powder were dry mixed at 150 r / min for 15 min to obtain a dry mixed material;

[0047] NaCl and KCl were mixed at a mass ratio of 1.5:1 and heated to 750°C to obtain a molten salt bath;

[0048] The dry mixed material was fed into the molten salt bath at a speed of 0.3 kg / min, while the salt bath was stirred at a speed of 80 r / min. After all the dry mixed material was added, the molten salt bath was allowed to stand for 20 min, and then naturally cooled to 250°C. A 300-mesh stainless steel filter screen was immersed in the molten salt bath to allow the settled composite powder particles to pass through the filter screen. Then the filter screen was pulled up at a uniform speed, and the molten salt bath was drained for 20 min. Subsequently, the molten salt bath was poured into deionized water, stirred for 8 min, and then filtered. The filter cake was dried at 120°C for 3 h to obtain a composite powder;

[0049] S3: smelting;

[0050] The nickel block, the chromium block, the iron block, and the molybdenum block were added to a vacuum induction furnace, and the vacuum was drawn to ≤5 Pa. The temperature was raised to 1460°C at a rate of 10°C / min, and the temperature was maintained for 40 min while stirring at 120 r / min. The composite powder was added to the furnace in five equal portions through a top charging device, with an interval of 3 min between each addition. The stirring speed was kept constant, and the temperature was maintained for another 50 min to obtain a melt;

[0051] S4: casting;

[0052] After the melt was discharged from the furnace, it was cast into a mold. The mold was first cooled at a rate of 30°C / min to 850°C, and then the mold was cooled to room temperature along with the furnace. A cast ingot was obtained;

[0053] S5: cogging;

[0054] The cast ingot was heated to 1090°C at a rate of 8°C / min and maintained for 250 min. The cast ingot was pressed using a fast forging machine. The single hammer reduction in the first pass was 70 mm, and the cast ingot was forged into a square billet. The square billet was heated to 1100°C at a rate of 5°C / min and maintained for 150 min. The square billet was forged into a wide slab using light pressing, heavy pressing, and light pressing in three stages;

[0055] The light pressing, heavy pressing, and light pressing in three stages were specifically as follows: the square billet heated to 1100°C was first subjected to light pressing in the first pass. The single hammer reduction was 20 mm, and the forging speed was 0.2 m / s. After 3 passes, the deformation was 15%, and the square billet was preliminarily shaped.

[0056] Subsequently, natural cooling to 1080℃ is performed, heavy pressing is performed, the single hammer reduction is increased to 45mm, the forging speed is increased to 0.5m / s, through 2 passes of forging, the deformation is 35%;

[0057] When the blank is further cooled to 1050℃, light pressing is performed, the single hammer reduction is 15mm, the forging speed is reduced to 0.2m / s, through 2 passes of forging, the deformation is 10%;

[0058] S6: segmented cold rolling and compounding;

[0059] After the wide slab is subjected to face milling treatment (removing the surface oxide skin and defect layer, milling thickness 1.0mm / surface), it is heated to 610℃ at 20℃ / min under inert gas protection, and kept for 16h, and cooled to room temperature in the furnace, to obtain a cold slab;

[0060] First-stage cold rolling, the slab is sent into a cold rolling mill, the deformation is 40%, the rolling speed is 0.4m / s, small tension control is adopted, and the tension value is 80MPa, to obtain a semi-finished plate;

[0061] Intermediate annealing, the semi-finished plate is heated to 860℃, kept for 50s, and then water quenched;

[0062] Second-stage cold rolling, the semi-finished plate after annealing is heated to 160℃, the deformation is 45%, the rolling speed is 0.5m / s, and variable roll gap rolling is adopted;

[0063] The roll gap value of the variable roll gap rolling and the real-time thickness of the semi-finished plate after annealing follow the following relationship:

[0064]

[0065] Wherein, is the real-time thickness of the plate before the second-stage cold rolling of the n th pass;

[0066] is the set deformation of the n th pass, taking 12%; is the roll system elastic compensation coefficient, taking 0.98;

[0067] is the roll gap value;

[0068] S7: straightening;

[0069] S7: straightening;

[0070] ​Adopting multi-roll continuous tension leveling process, the inlet section tension is 250 MPa, the leveling section tension is 320 MPa, and the outlet section tension is 260 MPa; the leveling roll is selected to be φ100 mm specification, the roll speed is 0.6 m / s, wherein the roll speed of the leveling section is higher than that of the inlet section and the outlet section by 0.05 m / s, the plate is placed for 15 min after tension leveling, and the high-silicon nickel-based alloy cold-rolled plate is obtained.

[0071] Embodiment 2: The embodiment provides a preparation process of a high-silicon nickel-based alloy cold-rolled plate, comprising the following steps:

[0072] S1: weighing raw materials;

[0073] 4.3% silicon powder (particle size 50-80 μm), 0.06% niobium powder (particle size 40-50 μm), 18.5% chromium block, 4.0% iron block, 2.0% molybdenum block, and the rest is nickel block;

[0074] S2: pre-compounding;

[0075] The silicon powder and the niobium powder are dry mixed at 100 r / min for 10 min to obtain a dry mixed material;

[0076] The NaCl and KCl are mixed at a mass ratio of 0.8:1, heated to 700 ℃, and a molten salt bath is obtained;

[0077] The dry mixed material is put into the molten salt bath at a speed of 0.2 kg / min, and the salt bath is stirred at a speed of 50 r / min, after all the materials are added, the molten salt bath is naturally cooled to 200 ℃, a 300-mesh stainless steel filter screen is immersed in the molten salt bath, so that all the settled composite powder particles enter the filter screen, then the filter screen is pulled up at a uniform speed, and the molten salt is drained for 10 min, then it is poured into deionized water, stirred and washed for 5 min, filtered, and dried at 100 ℃ for 2 h to obtain a composite powder;

[0078] S3: smelting;

[0079] The nickel block, the chromium block, the iron block, and the molybdenum block are added into a vacuum induction furnace, vacuumized to ≤5 Pa, heated to 1420 ℃ at a speed of 5 ℃ / min, stirred at 100 r / min and kept for 30 min, the composite powder is added into the furnace through a top charging device in three equal portions with an interval of 2 min, the speed is kept unchanged, and kept for 40 min to obtain a solution;

[0080] S4: casting;

[0081] After the melt is discharged from the furnace, it is cast into a mold, first cooled to 800 ℃ at a speed of 20 ℃ / min, and then cooled to room temperature with the furnace, to obtain an ingot;

[0082] S5: blooming forging;

[0083] The ingot is heated to 1060℃ at 6℃ / min and held for 200min. It is then pressed using a high-speed forging machine. The first hammer reduction is 50mm, and the ingot is forged into a square billet. The square billet is then heated to 1070℃ at 2℃ / min and held for 120min. It is then forged into a wide slab by alternating light pressure, heavy pressure and light pressure in three stages.

[0084] The three-stage alternating forging process of light pressure-heavy pressure-light pressure is as follows: the square billet heated to 1070℃ is first subjected to the first light pressure operation, with a single hammer reduction of 15mm and a forging speed of 0.1m / s. After two forging processes, the deformation is 10%, and the initial shaping of the square billet is completed.

[0085] After naturally cooling to 1050℃, heavy pressure was applied, increasing the single hammer reduction to 35mm and the forging speed to 0.3m / s. Through one forging pass, the deformation was 30%.

[0086] When the billet is further cooled to 1020℃, it is lightly pressed with a single hammer reduction of 10mm and the forging speed is reduced to 0.1m / s. After one forging, the deformation is 5%.

[0087] S6: Segmented cold-rolled composite;

[0088] After the wide slab is milled (removing the surface oxide scale and defect layer, milling thickness 0.5 mm / side), it is heated to 570℃ at 10℃ / min under inert gas protection, held at that temperature for 10h, and then cooled to room temperature in the furnace to obtain a cold slab.

[0089] In the first stage of cold rolling, the slab is fed into the cold rolling mill, the deformation is 35%, the rolling speed is 0.2m / s, and low tension control is adopted with a tension value of 50MPa to obtain semi-finished sheet material.

[0090] Intermediate annealing involves heating the semi-finished sheet to 810℃, holding it at that temperature for 30 seconds, and then water quenching.

[0091] Two-stage cold rolling involves heating the annealed semi-finished sheet to 120°C, with a deformation of 40% and a rolling speed of 0.3 m / s, using variable roll gap rolling.

[0092] The roll gap value of the variable roll gap rolling process and the real-time thickness of the semi-finished sheet after annealing follow the following relationship:

[0093]

[0094] in, For the first Real-time thickness of the sheet material before the second stage of cold rolling;

[0095] For the first The set deformation amount for each pass is within the range of 8%;

[0096] is the elastic compensation coefficient of the roller system, and is 0.98;

[0097] is the roll gap value;

[0098] S7: tension leveling;

[0099] A multi-roller continuous tension leveling process is adopted, the tension at the inlet section is 220 MPa, the tension at the leveling section is 280 MPa, and the tension at the outlet section is 230 MPa; the straightening roller is selected to be φ80 mm in specification, the roller speed is 0.3 m / s, wherein the roller speed at the leveling section is higher than that at the inlet section and the outlet section by 0.03 m / s, the plate is left to stand for 10 min after tension leveling, and a high-silicon nickel-based alloy cold-rolled plate is obtained.

[0100] Embodiment 3: The embodiment provides a preparation process of a high-silicon nickel-based alloy cold-rolled plate, comprising the following steps:

[0101] S1: weighing raw materials;

[0102] 4.4% silicon powder (particle size 50-80 μm), 0.09% niobium powder (particle size 40-50 μm), 19.1% chromium block, 4.7% iron block, 2.6% molybdenum block, and the rest is nickel block;

[0103] S2: pre-compounding;

[0104] The silicon powder and the niobium powder are dry mixed at 140 r / min for 12 min to obtain a dry mixed material;

[0105] The NaCl and KCl are mixed at a mass ratio of 1.1:1, heated to 730 ℃, and a molten salt bath is obtained;

[0106] The dry mixed material is put into the molten salt bath at a speed of 0.2 kg / min, and the salt bath is stirred at a speed of 60 r / min at the same time, after all the materials are added, the molten salt bath is left to stand for 17 min, and the molten salt bath is naturally cooled to 220 ℃, a 300-mesh stainless steel filter screen is immersed in the molten salt bath, so that all the settled composite powder particles enter the filter screen, then the filter screen is pulled up at a uniform speed, and the molten salt bath is drained for 14 min, then it is poured into deionized water, stirred and washed for 6 min, filtered, and dried at 108 ℃ for 2 h to obtain a composite powder;

[0107] S3: smelting;

[0108] The nickel block, the chromium block, the iron block, and the molybdenum block are added into a vacuum induction furnace, the vacuum is extracted to ≤5 Pa, the temperature is raised to 1430 ℃ at a rate of 6 ℃ / min, the stirring speed is 120 r / min, and the temperature is kept for 40 min, the composite powder is added through the top charging device of the furnace in five equal portions with an interval of 2 min, the stirring speed is kept unchanged, and the temperature is kept for 42 min to obtain a solution;

[0109] S4: casting;

[0110] After the melt is discharged, it is cast into a mold, cooled to 840°C at a speed of 28°C / min, and then cooled to room temperature in the furnace to obtain an ingot;

[0111] S5: cogging forging;

[0112] The ingot is heated to 1080°C at a speed of 8°C / min, and held for 220 min, and then pressed using a fast forging machine, with a single hammer reduction of 50 mm in the first heating, to forge a square blank, which is then heated to 1080°C at a speed of 3°C / min, and held for 140 min, and then forged into a wide slab using light pressure-heavy pressure-light pressure three-stage alternating forging;

[0113] The light pressure-heavy pressure-light pressure three-stage alternating forging step specifically comprises: the square blank heated to 1080°C is first subjected to light pressure operation in the first heating, with a single hammer reduction of 18 mm and a forging speed of 0.1 m / s, and after 3 passes of forging, the deformation is 13%, and the square blank is preliminarily shaped;

[0114] Subsequently, the heavy pressure is performed when the temperature is naturally lowered to 1060°C, with a single hammer reduction of 42 mm and a forging speed of 0.5 m / s, and after 2 passes of forging, the deformation is 30%;

[0115] The light pressure is performed when the temperature of the blank is further lowered to 1030°C, with a single hammer reduction of 12 mm and a forging speed of 0.2 m / s, and after 2 passes of forging, the deformation is 5%;

[0116] S6: segmented cold rolling and compounding;

[0117] After the wide slab is subjected to face milling treatment (to remove the surface oxide skin and defect layer, with a milling thickness of 0.5 mm per face), it is heated to 590°C at a speed of 14°C / min under inert gas protection, held for 14 h, and then cooled to room temperature in the furnace to obtain a cold slab;

[0118] First-stage cold rolling: the slab is fed into a cold rolling mill, with a deformation of 39% and a rolling speed of 0.3 m / s, and small tension control is adopted, with a tension value of 72 MPa, to obtain a semi-finished plate;

[0119] Intermediate annealing: the semi-finished plate is heated to 850°C and held for 30 s, and then water quenched;

[0120] Second-stage cold rolling: the semi-finished plate after annealing is heated to 130°C, with a deformation of 40% and a rolling speed of 0.3 m / s, and variable roll gap rolling is adopted;

[0121] The roll gap value of the variable roll gap rolling and the real-time thickness of the semi-finished plate after annealing follow the following relationship:

[0122]

[0123] wherein, is the first real-time thickness of the plate before the second stage of cold rolling;

[0124] is the first set deformation amount of the pass, and the value range is 9%;

[0125] is the roll system elastic compensation coefficient, and the value is 0.98;

[0126] is the roll gap value;

[0127] S7: tension leveling;

[0128] A multi-roll continuous tension leveling process is adopted, the inlet segment tension is 220 MPa, the straightening segment tension is 290 MPa, and the outlet segment tension is 250 MPa; the straightening roll is selected to be φ100 mm specification, the roll speed is 0.4 m / s, wherein the straightening segment roll speed is higher than the inlet segment and outlet segment rolls by 0.05 m / s, and the plate is placed for 15 min after tension leveling, to obtain a high-silicon nickel-based alloy cold-rolled plate.

[0129] Comparative Example 1: The difference between this comparative example and Example 3 is that the silicon powder and niobium powder are directly added to S3 in the form of dry mixture, i.e., without blending through a molten salt bath.

[0130] Comparative Example 2: The difference between this comparative example and Example 3 is that the light pressing-heavy pressing-light pressing three-stage alternating forging is not adopted, but heavy pressing once forging is adopted.

[0131] Experimental Example: 1. The Erichsen cupping value IE (mm) is detected according to GB / T 4156-2020 “Metallic Materials - Thin Sheet and Thin Strip - Erichsen Cupping Test”; it should be noted that the larger the Erichsen cupping value, the more plastic deformation the material can withstand without cracking during stamping forming.

[0132] 2. The elongation A (%) and the reduction of area Z (%) are detected according to GB / T 228.1-2021 “Metallic Materials - Tensile Test - Part 1: Room Temperature Test Methods”.

[0133] 3. The samples are immersed in 5% NaOH solution, 5% NaCl solution, and 5% H2SO4 solution at 80°C for 500 h, and the mass loss rate (%) after corrosion is detected respectively.

[0134] The detection results are shown in the following table:

[0135]

[0136] From the above table, the product plastic forming performance and corrosion resistance are simultaneously optimized.

[0137] The molten salt bath blending process is used in the raw material pre-compounding link, compared with the way of directly dry mixing of silicon powder and niobium powder in the comparative example 1, the process makes the silicon powder and niobium powder form a uniformly dispersed composite powder through high-temperature dispersion of NaCl and KCl molten salt bath, sedimentation filtration and cleaning and drying treatment, effectively avoiding the powder agglomeration phenomenon. The mass loss rate of the plate prepared in this way after immersion in 5% NaOH solution, 5% NaCl solution and 5% H2SO4 solution is greatly reduced, especially in the acidic corrosion environment, the corrosion resistance is more prominent, fully proving that the molten salt bath blending process can promote the uniform distribution of silicon and niobium elements in the alloy, and strengthen the corrosion resistance protection effect.

[0138] The light pressure-heavy pressure-light pressure three-section alternating forging process is used in the roughing forging link, compared with the single heavy pressure forging way in the comparative example 2, the internal stress concentration and organizational defects caused by single large deformation forging are avoided. The erichsen cupping value is significantly improved compared with the comparative example 2, the elongation after fracture and the reduction of area are obviously improved, which shows that the overall plastic deformation ability of the material is optimized, and it can better adapt to the complex processing procedures such as bending and stamping.

[0139] The above examples only illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above examples without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical idea disclosed by the present application should be covered by the claims of the present application.

Claims

1. A process for the production of a high-silicon nickel-based alloy cold-rolled sheet, characterized in that, The method comprises the following steps: S1: weighing raw materials; 4.3-4.8% silicon powder, 0.06-0.12% niobium powder, 18.5-20.0% chromium block, 4.0-5.5% iron block, 2.0-2.8% molybdenum block, and the rest is nickel block; S2: pre-compounding; The silicon powder and the niobium powder are dry mixed to obtain a dry mixture; the NaCl and the KCl are mixed and heated to obtain a molten salt bath; the dry mixture is put into the molten salt bath for heat preservation, and the composite powder particles are fished out after cooling, cleaned and filtered to obtain a composite powder; S3: smelting; The nickel block, the chromium block, the iron block, and the molybdenum block are added into a vacuum induction furnace, vacuumized, heated to 1420-1460℃, stirred and heat preserved, and the composite powder is added in batches, and the solution is obtained after continuous heat preservation; S4: casting; After the melt is discharged from the furnace, it is cast into a mold, and a cast ingot is obtained after cooling; S5: cogging forging; The cast ingot is heated and heat preserved, first forged into a square blank, and forged into a wide slab by light pressing-heavy pressing-light pressing three-section alternating forging; The light pressing-heavy pressing-light pressing three-section alternating forging step specifically comprises: the square blank heated to 1070-1100℃ is first subjected to light pressing operation in the first heating, the single hammer reduction is 15-20mm, the forging speed is 0.1-0.2m / s, 2-3 passes of forging are performed, and the deformation is 10-15%, so that the square blank is preliminarily shaped; Then, the heavy pressing is performed when the temperature is naturally reduced to 1050-1080℃, the single hammer reduction is increased to 35-45mm, the forging speed is increased to 0.3-0.5m / s, 1-2 passes of forging are performed, and the deformation is 30-35%; The light pressing is performed when the blank is further cooled to 1020-1050℃, the single hammer reduction is 10-15mm, the forging speed is reduced to 0.1-0.2m / s, 1-2 passes of forging are performed, and the deformation is 5-10%; S6: segmented cold rolling and compounding; After the wide slab is subjected to face milling treatment, heated and heat preserved, and cooled, a cold slab is obtained; a semi-finished material plate is obtained by one-stage cold rolling; after intermediate annealing, two-stage cold rolling is performed by using a variable roll gap rolling process; S7: drawing and straightening; A high-silicon nickel-based alloy cold-rolled plate is obtained by using a multi-roll continuous drawing and straightening process.

2. The process for producing high-silicon nickel-based alloy cold-rolled sheet according to claim 1, wherein The S2 specifically comprises: the silicon powder and the niobium powder are dry mixed at 100-150r / min for 10-15min to obtain a dry mixture; The NaCl and the KCl are mixed at a mass ratio of 0.8-1.5:1, heated to 700-750℃, and a molten salt bath is obtained; The dry mixture is put into the molten salt bath at a speed of 0.2-0.3kg / min, and the salt bath is stirred at a speed of 50-80r / min, after all the dry mixture is added, the molten salt bath is heat preserved for 15-20min, the molten salt bath is naturally cooled to 200-250℃, the filter screen is immersed in the molten salt bath, the filter screen is lifted, and the filter screen is drained for 10-20min, then deionized water is poured, stirred and cleaned for 5-8min, filtered, and dried at 100-120℃ for 2-3h to obtain a composite powder.

3. The process for producing high-silicon nickel-based alloy cold-rolled sheet according to claim 1, wherein S3 is specifically: adding nickel block, chromium block, iron block and molybdenum block into a vacuum induction furnace, vacuumizing to ≤5Pa, heating to 1420-1460℃ at a rate of 5-10℃ / min, stirring at 100-120r / min and keeping for 30-40min, adding the composite powder through the furnace top charging device in 3-5 portions with an interval of 2-3min each time, keeping the rotating speed unchanged, and continuing to keep for 40-50min to obtain a melt.

4. The process for producing high-silicon nickel-based alloy cold-rolled sheet according to claim 1, wherein S4 is specifically: after the melt is discharged from the furnace, casting into a mold, first cooling to 800-850℃ at a rate of 20-30℃ / min, and then cooling to room temperature with the furnace to obtain an ingot.

5. The process for producing high-silicon nickel-based alloy cold-rolled sheet according to claim 1, wherein S5 is specifically: heating the ingot to 1060-1090℃ at a rate of 6-8℃ / min, keeping for 200-250min, pressing by using a fast forging machine, single hammer reduction of 50-70mm in the first heating, forging into a square blank, heating the square blank to 1070-1100℃ at a rate of 2-5℃ / min again, keeping for 120-150min, and forging into a wide slab blank by using light pressure-heavy pressure-light pressure three-stage alternating forging.

6. The process for producing high-silicon nickel-based alloy cold-rolled sheet according to claim 1, wherein S6 is specifically: after the wide slab blank is milled, heating to 570-610℃ at a rate of 10-20℃ / min under inert gas protection, keeping for 10-16h, and cooling to room temperature with the furnace to obtain a cold slab blank. First-stage cold rolling: sending the slab blank into a cold rolling mill, deformation of 35-40%, rolling speed of 0.2-0.4m / s, small tension control, and tension value of 50-80MPa to obtain a semi-finished plate; Intermediate annealing: heating the semi-finished plate to 810-860℃, keeping for 30-50s, and then water quenching; Second-stage cold rolling: heating the semi-finished plate after annealing to 120-160℃, deformation of 40-45%, rolling speed of 0.3-0.5m / s, and variable roll gap rolling.

7. The process for producing high-silicon nickel-based alloy cold-rolled sheet according to claim 1, wherein S7 is specifically: using a multi-roll continuous drawing and straightening process, inlet segment tension of 220-250MPa, straightening segment tension of 280-320MPa, and outlet segment tension of 230-260MPa; after drawing and straightening, the plate is left to stand for 10-15min to obtain a high-silicon nickel-based alloy cold-rolled plate.

8. The process for producing a high-silicon nickel-based alloy cold-rolled sheet according to claim 7, characterized in that, The straightening roller is selected to have a specification of φ80-100mm, and the roller speed is 0.3-0.6m / s, wherein the straightening segment roller speed is higher than the inlet segment and outlet segment rollers by 0.03-0.05m / s.

9. A high-silicon nickel-based alloy cold-rolled plate prepared by the preparation process according to any one of claims 1-8.

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