High-precision stainless steel strip for electronic chips and method for manufacturing the same

Abstract

The application discloses a high-precision stainless steel strip for electronic chips and a preparation method thereof, and relates to the technical field of stainless steel. The preparation steps of the high-precision stainless steel strip for electronic chips include the following steps: taking a peeled steel blank to obtain a steel ingot by remelting, then performing forging and solid solution treatment, and obtaining a hot-rolled steel strip by hot rolling; the hot-rolled steel strip is placed in a rolling mill to perform first rolling, and a steel strip with a thickness of 1.00-1.05 mm is prepared; after the first rolling is completed, annealing is performed, and after the annealing is completed, pickling is performed, then second rolling is performed, and a cold-rolled steel strip with a thickness of 0.12-0.15 mm is prepared; after the second rolling is completed, annealing is performed, and after the annealing is completed, pickling, flattening and straightening are performed to obtain a stainless steel strip; after surface oil removal and polishing are performed, the stainless steel strip is placed in a nickel plating solution to perform nickel plating twice; after the nickel plating is completed, direct pickling and drying are performed, then third rolling is performed, and after the third rolling is completed, aging treatment is performed, and finally, a high-precision stainless steel strip with a thickness of 0.10-0.11 mm is obtained.

Description

Technical Field

[0001] This invention relates to the field of stainless steel technology, specifically to a high-precision stainless steel strip for electronic chips and its preparation method. Background Technology

[0002] In the current era of rapid development in the electronic information industry, electronic chips are constantly evolving towards miniaturization, high integration, and high performance. This places increasingly stringent requirements on various basic materials used in the chip manufacturing process. Stainless steel strip, as a key basic material in the field of electronic chip manufacturing, is widely used in the processing and manufacturing of core components such as chip carriers, lead frames, and packaging shells. Its performance directly affects the operational stability, service life, and overall performance of electronic chips.

[0003] Currently, electronic chips are becoming increasingly smaller and their internal structures more complex. Ultra-thin stainless steel strips can effectively save internal space, meeting the design requirements of high-density chip integration and contributing to chip miniaturization. However, electronic chips are often subjected to external forces and environmental influences during manufacturing, transportation, and use. Therefore, high-precision stainless steel strips must possess suitable hardness to ensure they do not easily deform during processing, guaranteeing that the dimensional accuracy of the processed components meets design standards. This provides stable structural support for the chip, resisting external mechanical shocks and vibrations, and ensuring the chip's normal operation. Therefore, developing a high-precision stainless steel strip for electronic chips that combines ultra-thinness, suitable hardness, and excellent overall performance has become an urgent need for the industry. Summary of the Invention

[0004] The purpose of this invention is to provide a high-precision stainless steel strip for electronic chips and its preparation method, so as to solve the problems raised in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A method for fabricating a high-precision stainless steel strip for electronic chips includes the following fabrication steps:

[0007] S1: Take the peeled steel billet, remelt it to obtain steel ingot, forge it to obtain billet, and after solution treatment, hot roll it into hot-rolled steel strip with a thickness of 1.5-2mm;

[0008] S2: Take the hot-rolled steel strip and place it in the rolling mill for the first rolling to produce a steel strip with a thickness of 1.00-1.05mm. After the first rolling, perform the first annealing. After the annealing, pickle and then perform the second rolling to produce a cold-rolled steel strip with a thickness of 0.12-0.15mm. After the second rolling, perform the second annealing. After the annealing, pickle, level and straighten to obtain stainless steel strip.

[0009] S3: After surface degreasing and polishing, the stainless steel strip made by S2 is nickel plated twice. After the deposition is completed, it is cleaned and dried, and then rolled for the third time. After the rolling is completed, it is aged to obtain a high-precision stainless steel strip with a thickness of 0.10-0.11mm.

[0010] Preferably, the chemical composition of the hot-rolled steel strip of S1, by mass percentage, includes: 0.04-0.065% C, 0.8-1.0% Si, 1.0-1.3% Mn, 0.004-0.006% P, 0.008-0.0010% S, 18-20% Cr, 8-10% Ni, 0.008% Al, 0.07% Nb, 0.03-0.05% Mo, 0.0002-0.0003% O, 0.03-0.05% N, 0.016% Ce, and the balance being Fe;

[0011] Preferably, the specific operation steps of S1 remelting are as follows: under a nitrogen pressurization atmosphere of 1.0MPa, the descaled steel billet is heated to 1600℃ and held for 30 minutes, then pre-melted slag is added, and after holding for another 5 minutes, deoxidizer coated with iron sheet is added for pre-deoxidation for 1-3 minutes, then rare earth cerium and Na2O coated with iron sheet are added, and after holding for deoxidation for 30-40 minutes, it is cooled and solidified with the furnace.

[0012] Preferably, the pre-melted slag comprises 50-60 parts by weight of CaF2, 20-30 parts by weight of Al2O3, 10-20 parts by weight of CaO, and 3-5 parts by weight of SiO2;

[0013] Preferably, the mass of the pre-dissolved slag is 15-20% of the weight of the peeled steel billet;

[0014] Preferably, the deoxidizer is 10-15% of the weight of the descaled steel billet, and the deoxidizer is aluminum granules and calcium silicide in a mass ratio of (0-0.5):2.

[0015] Preferably, the mass of Na2O is 2-5% of the weight of the de-scaldged steel billet;

[0016] Preferably, the initial forging temperature of S1 is 1150℃, and the final forging temperature is 850℃; the forging yields a billet with a thickness of 20-30mm; the specific process parameters for solution treatment are: solution temperature of 1150-1250℃, solution time of 2-3h; hot rolling adopts 4-6 passes, with an initial rolling temperature of 1150-1200℃, a final rolling temperature of 850-1050℃, and a total hot rolling reduction rate of 90-94%;

[0017] Preferably, S2 cold rolling is performed directly in the hot-rolled state without annealing, using a staged cold rolling process:

[0018] The first rolling process involves 3-5 passes, with a reduction rate of 20-25% per pass.

[0019] The second rolling process involves 12-15 passes, with a reduction rate of 10-18% per pass.

[0020] Improve product processing precision and reduce rolling accidents such as strip breakage;

[0021] During the two cold rolling processes, the annealing process is optimized, and the annealing temperature is gradually reduced to adapt to the rolling process.

[0022] The first annealing temperature is 600-650℃, and the annealing time is 10-12h; the purpose is to eliminate the work hardening of the first rolling, restore the plasticity of the steel strip, and retain a certain deformation resistance.

[0023] The second annealing temperature is 450-500℃, and the annealing time is 16-18h; the purpose is to completely eliminate cumulative work hardening, maintain fine grain structure, avoid excessive grain growth, and ensure uniform structure and stable composition of steel strip.

[0024] Preferably, the composition of the plating solution for the first nickel plating in the S3 double nickel plating process includes: 20-30 g / L NiSO4·7H2O, 8-12 g / L NaH2PO2·H2O, 8-12 g / L CH3COONa, 8-10 g / L Na3C6HO7·2H2O, 5-15 g / L reinforcing particles I, and 0.02-0.05 g / L octadecyltrimethylammonium bromide; the plating solution temperature is 80-90℃, the pH is 4-5, and the deposition time is 40-60 min.

[0025] Preferably, the preparation steps of reinforced particle I are as follows: 3-aminopropyltriethoxysilane is hydrolyzed in an aqueous ethanol solution, then alumina particles are added, and the mixture is stirred in a water bath at 60-65℃ for 2 hours, filtered, and dried to obtain aminated alumina. Hexagonal boron nitride is dispersed in deionized water, and two-dimensional titanium carbide is added and ultrasonicated for 20-30 minutes, then filtered and washed. The mixture is placed in a sodium hydroxide solution, stirred in an oil bath at 120-125℃ for 12 hours, filtered, and dried. The mixture is then placed in deionized water along with the above-mentioned aminated alumina, the pH is adjusted to 4-5, stirred for 5 hours, and then filtered and dried. The mass ratio of alumina, hexagonal boron nitride, and two-dimensional titanium carbide is (2-5):1:1.

[0026] Preferably, the composition of the plating solution for the second nickel plating in the S3 double nickel plating process includes: 20-30 g / L NiSO4·7H2O, 8-12 g / L NaH2PO2·H2O, 8-12 g / L CH3COONa, 8-10 g / L Na3C6HO7·2H2O, 1-2 g / L Na2MoO4, 10-20 g / L reinforcing particles II, and 0.03-0.05 g / L octadecyltrimethylammonium bromide; the plating solution temperature is 80-90℃, the pH is 4-5, and the deposition time is 30-50 min.

[0027] Preferably, the preparation steps of reinforced particle II are as follows: cerium nitrate hexahydrate, 4,4'-biphenyl dicarboxylic acid, and 2-fluorobenzoic acid are placed in N,N-dimethylformamide aqueous solvent, nitric acid is added, and the mixture is sonicated for 30-40 min, then heated to 105℃ and reacted for 72 h. After cooling to room temperature, the mixture is filtered and dried, placed in the hydrolysate of 3-aminopropyltriethoxysilane, and stirred in a water bath at 60-65℃ for 2 h. After filtration and drying, an aminated rare earth framework is obtained. This framework and hydroxylated composite particles are then placed in deionized water, the pH is adjusted to 4-5, stirred for 5 h, and then filtered and dried. The molar ratio of cerium nitrate hexahydrate, 4,4'-biphenyl dicarboxylic acid, and 2-fluorobenzoic acid is (0.5-1.5):1:30; the mass ratio of the aminated rare earth framework to the hydroxylated composite particles is (1-2):1.

[0028] Preferably, in the preparation of reinforcing particle II, the hydroxylated composite particles are taken from the hydroxylated composite particles in reinforcing particle I;

[0029] Preferably, in S3, the third rolling process uses 12-15 passes of cold rolling, with a reduction rate of 3-5% per pass; the aging treatment temperature is 200-220℃, and the aging treatment time is 10-12 hours.

[0030] A high-precision stainless steel strip for electronic chips is prepared by the above-described preparation method.

[0031] Compared with the prior art, the beneficial effects of the present invention are:

[0032] 1. This invention involves remelting steel billet material, introducing rare earth cerium and sodium oxide to refine the molten steel, and deoxidizing and desulfurizing it to reduce the sulfur content in the steel billet to below 0.0010% and the oxygen content to below 0.0003%, thereby optimizing the chemical composition of the steel billet, refining the grains and improving the performance of the steel billet. Then, the hot-rolled steel strip is cold-rolled without annealing, and grain recovery and recrystallization are carried out in this state to eliminate part of the work hardening. The grains are further refined during subsequent cold rolling and annealing.

[0033] 2. The hot-rolled steel strip undergoes staged cold rolling and annealing to improve the uniformity of the steel's microstructure and enhance processing accuracy. After cold rolling, surface treatment is performed, including two nickel plating processes. In the first nickel plating bath, reinforcing particles I are added. These particles, composed of boron nitride and two-dimensional titanium carbide treated with an alkaline solution, expose numerous active sites, resulting in hydroxylated composite particles. Alumina undergoes amination treatment to reduce agglomeration and improve dispersion, hybridizing with the hydroxylated composite particles to achieve excellent corrosion resistance and wear resistance in the nickel plating layer. The high-hardness alumina particle coating serves only as the bottom layer of the gradient plating, providing stable rigidity for the subsequent second nickel plating. While providing support, it enhances the resistance to plastic deformation of the underlying layer, reducing the peeling between the coating and the steel strip substrate caused by subsequent rolling pressure. In the second nickel plating, the reinforcing particles II adopt a hybrid of aminated rare earth framework and hydroxylated composite particles. The coordination effect of the rare earth framework strengthens the interfacial bonding between the reinforcing particles and the coating. At the same time, the porous adsorption structure of the rare earth framework can maintain a stable nickel deposition efficiency and improve the coating uniformity. Rare earth ions effectively accelerate the deposition rate. Therefore, a dense coating can be achieved while accelerating the deposition efficiency. Mo is added in the second nickel plating, which works synergistically with the reinforcing particles II to improve corrosion resistance.

[0034] 3. The gradient functional design of the two nickel plating layers forms a gradient structure of "hard substrate + soft surface layer", balancing the overall mechanical properties and wear and corrosion resistance of the coating. After surface treatment, a final rolling is performed to improve the bonding force between the steel strip and the gradient nickel plating layer. At the same time, the gradient functional coating has good ability to follow the deformation of the substrate, reducing coating damage caused by stress concentration during rolling. The subsequent aging treatment further refines the grains, improving hardness, wear resistance and corrosion resistance while ensuring dense bonding between layers. Detailed Implementation

[0035] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] In the experiment, the specific remelting operation steps were as follows: Under a nitrogen pressurization atmosphere of 1.0 MPa, the de-scaling steel billet was heated to 1600℃ and held for 30 min, then pre-melted slag was added. After holding for another 5 min, a deoxidizer coated with a 2 mm thick iron sheet was added for pre-deoxidation for 2 min. Then, rare earth cerium and Na2O coated with a 2 mm thick iron sheet were added. After holding for deoxidation for 40 min, the billet was cooled and solidified in the furnace. The pre-melted slag consisted of 55 parts CaF2, 22 parts Al2O3, 20 parts CaO, and 3 parts SiO2 by weight. The mass of the pre-melted slag was 15% of the de-scaling steel billet. The deoxidizer was 12% of the de-scaling steel billet and consisted of aluminum granules and calcium silicide in a mass ratio of 0.5:2. The mass of Na2O was 4% of the de-scaling steel billet.

[0037] The chemical composition of the hot-rolled steel strip, by mass percentage, includes: 0.057% C, 0.83% Si, 1.2% Mn, 0.004% P, 0.008% S, 18.73% Cr, 8.91% Ni, 0.008% Al, 0.07% Nb, 0.04% Mo, 0.0006% O, 0.05% N, 0.016% Ce, and the balance being Fe;

[0038] The alumina was α-phase high-purity alumina powder with a particle size of 150-500 nm; the hexagonal boron nitride had a flake size of 0.1-0.4 μm; and the two-dimensional titanium carbide had a flake size of 1-10 μm; all were purchased from Xianfeng Nano.

[0039] Example 1: This example provides a method for preparing high-precision stainless steel strips for electronic chips. The specific steps are as follows:

[0040] S1: Take the peeled steel billet and remelt it to obtain a steel ingot. Then forge it at an initial forging temperature of 1150℃ and a final forging temperature of 850℃ to obtain a billet with a thickness of 20mm. After solution treatment at 1200℃ for 3 hours, hot rolling is carried out using 6 passes of rolling. The initial rolling temperature is 1150℃ and the final rolling temperature is 900℃. The total hot rolling reduction rate is 90%, resulting in a hot-rolled steel strip with a thickness of 2mm.

[0041] S2: Take the hot-rolled steel strip and place it in the rolling mill for the first rolling. Roll it in 3 passes to make a steel strip with a thickness of 1.00mm. After the first rolling, perform the first annealing at 650℃ for 12 hours. After annealing, pickle and then perform the second rolling in 15 passes to make a cold-rolled steel strip with a thickness of 0.12mm. After rolling, perform the second annealing at 500℃ for 16 hours. After annealing, pickle, level and straighten to obtain stainless steel strip.

[0042] S3: After surface degreasing and polishing, the stainless steel strip made by S2 is nickel-plated twice and then directly pickled, dried and rolled for the third time. It is cold rolled in 12 passes and then aged at 200℃ for 10 hours to obtain a high-precision stainless steel strip with a thickness of 0.10mm.

[0043] The composition of the first nickel plating solution includes: 25 g / L NiSO4·7H2O, 10 g / L NaH2PO2·H2O, 8 g / L CH3COONa, and 8 g / L... Na3C6HO7·2H2O, 8 g / L reinforcing particles I, and 0.03 g / L octadecyltrimethylammonium bromide; the preparation steps of reinforcing particles I are as follows: 3-aminopropyltriethoxysilane is hydrolyzed in 100 mL of 95% ethanol aqueous solution to obtain a 2% silane hydrolysate, 20 g of alumina particles are added, and the mixture is stirred in a water bath at 60℃ for 2 h, filtered and dried to obtain aminated alumina. 10 g of hexagonal boron nitride is dispersed in deionized water, and 10 g of two-dimensional titanium carbide is added, ultrasonicated for 30 min, filtered and washed, and placed in 250 mL of 5 mol / L sodium hydroxide solution. The mixture is stirred in an oil bath at 120℃ for 12 h, filtered and dried to obtain hydroxylated composite particles. These particles are then placed in deionized water along with the above aminated alumina, the pH is adjusted to 4, stirred for 5 h, filtered and dried; the plating bath temperature is 80℃, the pH is 4, and deposition takes 50 min.

[0044] The composition of the second nickel plating solution includes: 25 g / L NiSO4·7H2O, 10 g / L NaH2PO2·H2O, 8 g / L CH3COONa, and 8 g / L The preparation steps of reinforced particles II are as follows: 5g of cerium nitrate hexahydrate, 2.76g of 4,4'-biphenyl dicarboxylic acid and 48.35g of 2-fluorobenzoic acid were placed in 200mL of N,N-dimethylformamide aqueous solvent, 10mL of nitric acid was added, and the mixture was sonicated for 40min, then heated to 105℃ and reacted for 72h. After cooling to room temperature, the mixture was filtered and dried, and placed in a hydrolysate containing 2% 3-aminopropyltriethoxysilane. The mixture was stirred in a water bath at 65℃ for 2h, and then filtered and dried to obtain an aminated rare earth framework. 20g of the aminated rare earth framework and 20g of hydroxylated composite particles were placed in deionized water, the pH was adjusted to 4, and the mixture was stirred for 5h and then filtered and dried. The plating solution temperature was 80℃, the pH was 4, and the deposition time was 30min.

[0045] Example 2: This example provides a method for preparing high-precision stainless steel strips for electronic chips. The specific steps are as follows:

[0046] S1: Take the peeled steel billet and remelt it to obtain a steel ingot. Then forge it at an initial forging temperature of 1150℃ and a final forging temperature of 850℃ to obtain a billet with a thickness of 20mm. After solution treatment at 1200℃ for 3 hours, hot rolling is carried out using 6 passes of rolling. The initial rolling temperature is 1150℃ and the final rolling temperature is 900℃. The total hot rolling reduction rate is 90%, resulting in a hot-rolled steel strip with a thickness of 2mm.

[0047] S2: Take the hot-rolled steel strip and place it in the rolling mill for the first rolling. Roll it in 3 passes to make a steel strip with a thickness of 1.00mm. After the first rolling, perform the first annealing at 600℃ for 12 hours. After annealing, pickle and then perform the second rolling in 15 passes to make a cold-rolled steel strip with a thickness of 0.12mm. After rolling, perform the second annealing at 450℃ for 18 hours. After annealing, pickle, level and straighten to obtain stainless steel strip.

[0048] S3: After surface degreasing and polishing, the stainless steel strip made by S2 is nickel plated twice and then directly pickled, dried and rolled for the third time. It is cold rolled in 12 passes and then aged at 200℃ for 12 hours to obtain a high-precision stainless steel strip with a thickness of 0.10mm.

[0049] The composition of the first nickel plating solution includes: 25 g / L NiSO4·7H2O, 10 g / L NaH2PO2·H2O, 8 g / L CH3COONa, and 8 g / L... Na3C6HO7·2H2O, 10 g / L reinforcing particles I, and 0.03 g / L octadecyltrimethylammonium bromide; the preparation steps of reinforcing particles I are as follows: 3-aminopropyltriethoxysilane is hydrolyzed in 100 mL of 95% ethanol aqueous solution to obtain a 2% silane hydrolysate, 30 g of alumina particles are added, and the mixture is stirred in a water bath at 60℃ for 2 h, filtered and dried to obtain aminated alumina. 10 g of hexagonal boron nitride is dispersed in deionized water, and 10 g of two-dimensional titanium carbide is added, ultrasonicated for 30 min, filtered and washed, and placed in 250 mL of 5 mol / L sodium hydroxide solution. The mixture is stirred in an oil bath at 120℃ for 12 h, filtered and dried, and then placed in deionized water with the above aminated alumina. The pH is adjusted to 4, stirred for 5 h, and then filtered and dried. The plating solution temperature is 80℃, pH is 4, and deposition time is 50 min.

[0050] The composition of the second nickel plating solution includes: 25 g / L NiSO4·7H2O, 10 g / L NaH2PO2·H2O, 8 g / L CH3COONa, and 8 g / L The preparation steps of reinforced particles II are as follows: 5g of cerium nitrate hexahydrate, 2.76g of 4,4'-biphenyl dicarboxylic acid and 48.35g of 2-fluorobenzoic acid were placed in 200mL of N,N-dimethylformamide aqueous solvent, 10mL of nitric acid was added, and the mixture was sonicated for 40min, then heated to 105℃ and reacted for 72h. After cooling to room temperature, the mixture was filtered and dried, and placed in a hydrolysate containing 2% 3-aminopropyltriethoxysilane. The mixture was stirred in a water bath at 65℃ for 2h, and then filtered and dried to obtain an aminated rare earth framework. 20g of the aminated rare earth framework and 20g of hydroxylated composite particles were placed in deionized water, the pH was adjusted to 4, and the mixture was stirred for 5h and then filtered and dried. The plating solution temperature was 80℃, the pH was 4, and the deposition time was 30min.

[0051] Example 3: This example provides a method for preparing high-precision stainless steel strips for electronic chips. The specific steps are as follows:

[0052] S1: Take the peeled steel billet and remelt it to obtain a steel ingot. Then forge it at an initial forging temperature of 1150℃ and a final forging temperature of 850℃ to obtain a billet with a thickness of 20mm. After solution treatment at 1200℃ for 3 hours, hot rolling is carried out using 6 passes of rolling. The initial rolling temperature is 1150℃ and the final rolling temperature is 900℃. The total hot rolling reduction rate is 90%, resulting in a hot-rolled steel strip with a thickness of 2mm.

[0053] S2: Take the hot-rolled steel strip and place it in the rolling mill for the first rolling. Roll it in 5 passes to make a steel strip with a thickness of 1.00mm. After the first rolling, perform the first annealing at 650℃ for 12 hours. After annealing, pickle and then perform the second rolling in 15 passes to make a cold-rolled steel strip with a thickness of 0.12mm. After rolling, perform the second annealing at 450℃ for 18 hours. After annealing, pickle, level and straighten to obtain stainless steel strip.

[0054] S3: After surface degreasing and polishing, the stainless steel strip made by S2 is nickel plated twice and then directly pickled, dried and rolled for the third time. It is cold rolled in 12 passes and then aged at 200℃ for 12 hours to obtain a high-precision stainless steel strip with a thickness of 0.10mm.

[0055] The composition of the first nickel plating solution includes: 25 g / L NiSO4·7H2O, 10 g / L NaH2PO2·H2O, 8 g / L CH3COONa, and 8 g / L... The ingredients are Na3C6HO7·2H2O, 2 g / L Na2MoO4, 12 g / L reinforcing particles I, and 0.03 g / L octadecyltrimethylammonium bromide. The preparation steps for reinforcing particles I are as follows: 3-aminopropyltriethoxysilane is hydrolyzed in 100 mL of 95% ethanol aqueous solution to obtain a 2% silane hydrolysate. 25 g of alumina particles are added, and the mixture is stirred in a water bath at 60℃ for 2 h, filtered, and dried to obtain aminated alumina. 10 g of hexagonal boron nitride is dispersed in deionized water, and 10 g of two-dimensional titanium carbide is added. The mixture is ultrasonicated for 20-30 min, filtered, and washed. It is then placed in 250 mL of 5 mol / L sodium hydroxide solution, stirred in an oil bath at 120℃ for 12 h, filtered, and dried. This mixture, along with the aminated alumina, is placed in deionized water, the pH is adjusted to 4, stirred for 5 h, and then filtered and dried. The plating bath temperature is 80℃, the pH is 4, and deposition takes 50 min.

[0056] The composition of the second nickel plating solution includes: 25 g / L NiSO4·7H2O, 10 g / L NaH2PO2·H2O, 8 g / L CH3COONa, and 8 g / L The preparation steps of reinforced particles II are as follows: 5g of cerium nitrate hexahydrate, 2.76g of 4,4'-biphenyl dicarboxylic acid and 48.35g of 2-fluorobenzoic acid were placed in 200mL of N,N-dimethylformamide aqueous solvent, 10mL of nitric acid was added, and the mixture was sonicated for 40min. The temperature was then raised to 105℃ and reacted for 72h. After cooling to room temperature, the mixture was filtered and dried. It was then placed in a hydrolysate containing 2% 3-aminopropyltriethoxysilane and stirred in a water bath at 65℃ for 2h. After filtration and drying, an aminated rare earth framework was obtained. 25g of the aminated rare earth framework and 20g of hydroxylated composite particles were placed in deionized water, the pH was adjusted to 4, and the mixture was stirred for 5h. After filtration and drying, the plating solution temperature was 80℃, the pH was 4, and the deposition time was 30min.

[0057] Comparative Example 1: As a control experiment for Example 3, no reinforcing particles I were added to the first nickel plating solution. The specific steps are as follows:

[0058] S1: Take the peeled steel billet and remelt it to obtain a steel ingot. Then forge it at an initial forging temperature of 1150℃ and a final forging temperature of 850℃ to obtain a billet with a thickness of 20mm. After solution treatment at 1200℃ for 3 hours, hot rolling is carried out using 6 passes of rolling. The initial rolling temperature is 1150℃ and the final rolling temperature is 900℃. The total hot rolling reduction rate is 90%, resulting in a hot-rolled steel strip with a thickness of 2mm.

[0059] S2: Take the hot-rolled steel strip and place it in the rolling mill for the first rolling. Roll it in 5 passes to produce a steel strip with a thickness of 1.00mm. After the first rolling, perform the first annealing at 650℃ for 12 hours. After annealing, pickle and then perform the second rolling in 15 passes with a reduction rate of 13-15% per pass to produce a cold-rolled steel strip with a thickness of 0.12mm. After rolling, perform the second annealing at 450℃ for 18 hours. After annealing, pickle, level and straighten to obtain stainless steel strip.

[0060] S3: After surface degreasing and polishing, the stainless steel strip made by S2 is nickel plated twice and then directly pickled, dried and rolled for the third time. It is cold rolled in 12 passes and then aged at 200℃ for 12 hours to obtain a high-precision stainless steel strip with a thickness of 0.10mm.

[0061] The first nickel plating bath consisted of: 25 g / L NiSO4·7H2O, 10 g / L NaH2PO2·H2O, 8 g / L CH3COONa, 8 g / L Na3C6HO7·2H2O, 2 g / L Na2MoO4, and 0.03 g / L octadecyltrimethylammonium bromide; the plating bath temperature was 80℃, the pH was 4, and the deposition time was 50 min.

[0062] The composition of the second nickel plating solution includes: 25 g / L NiSO4·7H2O, 10 g / L NaH2PO2·H2O, 8 g / L CH3COONa, and 8 g / L The preparation steps of reinforced particles II are as follows: 5g of cerium nitrate hexahydrate, 2.76g of 4,4'-biphenyl dicarboxylic acid and 48.35g of 2-fluorobenzoic acid were placed in 200mL of N,N-dimethylformamide aqueous solvent, 10mL of nitric acid was added, and the mixture was sonicated for 40min. The temperature was then raised to 105℃ and reacted for 72h. After cooling to room temperature, the mixture was filtered and dried. It was then placed in a hydrolysate containing 2% 3-aminopropyltriethoxysilane and stirred in a water bath at 65℃ for 2h. After filtration and drying, an aminated rare earth framework was obtained. 25g of the aminated rare earth framework and 20g of hydroxylated composite particles were placed in deionized water, the pH was adjusted to 4, and the mixture was stirred for 5h. After filtration and drying, the plating solution temperature was 80℃, the pH was 4, and the deposition time was 30min.

[0063] Comparative Example 2: As a control experiment for Example 3, no reinforcing particles II were added to the second nickel plating solution. The specific steps are as follows:

[0064] S1: Take the peeled steel billet and remelt it to obtain a steel ingot. Then forge it at an initial forging temperature of 1150℃ and a final forging temperature of 850℃ to obtain a billet with a thickness of 20mm. After solution treatment at 1200℃ for 3 hours, hot rolling is carried out using 6 passes of rolling. The initial rolling temperature is 1150℃ and the final rolling temperature is 900℃. The total hot rolling reduction rate is 90%, resulting in a hot-rolled steel strip with a thickness of 2mm.

[0065] S2: Take the hot-rolled steel strip and place it in the rolling mill for the first rolling. Roll it in 5 passes to produce a steel strip with a thickness of 1.00mm. After the first rolling, perform the first annealing at 650℃ for 12 hours. After annealing, pickle and then perform the second rolling in 15 passes with a reduction rate of 13-15% per pass to produce a cold-rolled steel strip with a thickness of 0.12mm. After rolling, perform the second annealing at 450℃ for 18 hours. After annealing, pickle, level and straighten to obtain stainless steel strip.

[0066] S3: After surface degreasing and polishing, the stainless steel strip made by S2 is nickel plated twice and then directly pickled, dried and rolled for the third time. It is cold rolled in 12 passes and then aged at 200℃ for 12 hours to obtain a high-precision stainless steel strip with a thickness of 0.10mm.

[0067] The composition of the first nickel plating solution includes: 25 g / L NiSO4·7H2O, 10 g / L NaH2PO2·H2O, 8 g / L CH3COONa, and 8 g / L... The ingredients are Na3C6HO7·2H2O, 2 g / L Na2MoO4, 12 g / L reinforcing particles I, and 0.03 g / L octadecyltrimethylammonium bromide. The preparation steps for reinforcing particles I are as follows: 3-aminopropyltriethoxysilane is hydrolyzed in 100 mL of 95% ethanol aqueous solution to obtain a 2% silane hydrolysate. 25 g of alumina particles are added, and the mixture is stirred in a water bath at 60℃ for 2 h, filtered, and dried to obtain aminated alumina. 10 g of hexagonal boron nitride is dispersed in deionized water, and 10 g of two-dimensional titanium carbide is added. The mixture is ultrasonicated for 20-30 min, filtered, and washed. It is then placed in 250 mL of 5 mol / L sodium hydroxide solution, stirred in an oil bath at 120℃ for 12 h, filtered, and dried. This mixture, along with the aminated alumina, is placed in deionized water, the pH is adjusted to 4, stirred for 5 h, and then filtered and dried. The plating bath temperature is 80℃, the pH is 4, and deposition takes 50 min.

[0068] The composition of the second nickel plating solution includes: 25 g / L NiSO4·7H2O, 10 g / L NaH2PO2·H2O, 8 g / L CH3COONa, 8 g / L Na3C6HO7·2H2O, 2 g / L Na2MoO4 and 0.03 g / L octadecyltrimethylammonium bromide; the plating solution temperature is 80℃, the pH is 4, and the deposition time is 30 min.

[0069] Comparative Example 3: As a control experiment for Example 3, no cold rolling or aging treatment was performed. The specific steps are as follows:

[0070] S1: Take the peeled steel billet and remelt it to obtain a steel ingot. Then forge it at an initial forging temperature of 1150℃ and a final forging temperature of 850℃ to obtain a billet with a thickness of 20mm. After solution treatment at 1200℃ for 3 hours, hot rolling is carried out using 6 passes of rolling. The initial rolling temperature is 1150℃ and the final rolling temperature is 900℃. The total hot rolling reduction rate is 90%, resulting in a hot-rolled steel strip with a thickness of 2mm.

[0071] S2: Take the hot-rolled steel strip and place it in the rolling mill for the first rolling. Roll it in 5 passes to produce a steel strip with a thickness of 1.00mm. After the first rolling, perform the first annealing at 650℃ for 12 hours. After annealing, pickle and then perform the second rolling in 15 passes with a reduction rate of 13-15% per pass to produce a cold-rolled steel strip with a thickness of 0.12mm. After rolling, perform the second annealing at 450℃ for 18 hours. After annealing, pickle, level and straighten to obtain stainless steel strip.

[0072] S3: After surface degreasing and polishing, the stainless steel strip made by S2 is nickel plated twice and then directly pickled and dried to obtain stainless steel strip.

[0073] The composition of the first nickel plating solution includes: 25 g / L NiSO4·7H2O, 10 g / L NaH2PO2·H2O, 8 g / L CH3COONa, and 8 g / L... The ingredients are Na3C6HO7·2H2O, 2 g / L Na2MoO4, 12 g / L reinforcing particles I, and 0.03 g / L octadecyltrimethylammonium bromide. The preparation steps for reinforcing particles I are as follows: 3-aminopropyltriethoxysilane is hydrolyzed in 100 mL of 95% ethanol aqueous solution to obtain a 2% silane hydrolysate. 25 g of alumina particles are added, and the mixture is stirred in a water bath at 60℃ for 2 h, filtered, and dried to obtain aminated alumina. 10 g of hexagonal boron nitride is dispersed in deionized water, and 10 g of two-dimensional titanium carbide is added. The mixture is ultrasonicated for 20-30 min, filtered, and washed. It is then placed in 250 mL of 5 mol / L sodium hydroxide solution, stirred in an oil bath at 120℃ for 12 h, filtered, and dried. This mixture, along with the aminated alumina, is placed in deionized water, the pH is adjusted to 4, stirred for 5 h, and then filtered and dried. The plating bath temperature is 80℃, the pH is 4, and deposition takes 50 min.

[0074] The composition of the second nickel plating solution includes: 25 g / L NiSO4·7H2O, 10 g / L NaH2PO2·H2O, 8 g / L CH3COONa, and 8 g / L The preparation steps of reinforced particles II are as follows: 5g of cerium nitrate hexahydrate, 2.76g of 4,4'-biphenyl dicarboxylic acid and 48.35g of 2-fluorobenzoic acid were placed in 200mL of N,N-dimethylformamide aqueous solvent, 10mL of nitric acid was added, and the mixture was sonicated for 40min. The temperature was then raised to 105℃ and reacted for 72h. After cooling to room temperature, the mixture was filtered and dried. It was then placed in a hydrolysate containing 2% 3-aminopropyltriethoxysilane and stirred in a water bath at 65℃ for 2h. After filtration and drying, an aminated rare earth framework was obtained. 25g of the aminated rare earth framework and 20g of hydroxylated composite particles were placed in deionized water, the pH was adjusted to 4, and the mixture was stirred for 5h. After filtration and drying, the plating solution temperature was 80℃, the pH was 4, and the deposition time was 30min.

[0075] Testing and Experiment

[0076] 1. The microhardness of the high-precision stainless steel strips prepared in Examples 1-3 and Comparative Examples 1-3 was measured using an FM-700 micro Vickers hardness tester. The load was 100 gf and the holding time was 10 s. The data are recorded in Table 1.

[0077] 2. Wear resistance was tested using a reciprocating friction and wear tester. The friction pair consisted of GCr15 cemented carbide steel balls with a diameter of 2 mm, a wear track length of 8 mm, a load of 10 N, and a duration of 10 min. The mass difference before and after wear was calculated and is shown in Table 1.

[0078] 3. Referring to the ASTM B117 salt spray test, a 5% sodium chloride solution was used at a temperature of 35℃ for a test period of 720 hours. The corrosion rate was calculated and is shown in Table 1.

[0079] Table 1

[0080]

[0081] Conclusion: The experimental results show that the high-precision stainless steel strip obtained by the process design and component design in Example 3 has better hardness, wear amount and corrosion rate than the other two examples. Comparative Example 1, as a control experiment of Example 3, did not add reinforcing filler I during the first nickel plating, which affected the hardness, wear resistance and corrosion resistance. Comparative Example 2 did not add reinforcing filler II during the second nickel plating, which greatly affected the wear resistance and corrosion resistance. Comparative Example 3 did not perform cold rolling and aging treatment after nickel plating to optimize the surface, and the surface hardness decreased significantly, and the wear resistance and corrosion resistance also decreased significantly.

[0082] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for producing a high-precision stainless steel strip for electronic chips, characterized by, The preparation steps include the following: S1: taking a peeled steel blank to obtain an ingot by remelting, and then taking the ingot to obtain a blank by forging, and then taking the blank to obtain a hot-rolled steel strip with a thickness of 1.5-2 mm by hot rolling after solid solution treatment; S2: taking the hot-rolled steel strip to a rolling mill to perform first rolling to obtain a steel strip with a thickness of 1.00-1.05 mm, performing first annealing after the first rolling, pickling after the annealing, and then performing second rolling to obtain a cold-rolled steel strip with a thickness of 0.12-0.15 mm, performing second annealing after the second rolling, pickling after the annealing, and then flattening and straightening to obtain a stainless steel strip; S3: after polishing the stainless steel strip obtained in S2, performing two times of nickel plating, cleaning and drying after the deposition, performing third rolling, and then performing aging treatment to obtain a high-precision stainless steel strip with a thickness of 0.10-0.11 mm; The plating solution for the first nickel plating in the two times of nickel plating in S3 includes 20-30 g / L of NiSO4·7H2O, 8-12 g / L of NaH2PO2·H2O, 8-12 g / L of CH3COONa, 8-10 g / L of Na3C6HO7·2H2O, 5-15 g / L of enhanced particles I, and 0.02-0.05 g / L of octadecyl trimethyl ammonium bromide; the plating solution has a temperature of 80-90 DEG C and a pH of 4-5; and the deposition time is 40-60 min; The preparation steps of the enhanced particles I are as follows: 3-aminopropyl triethoxysilane is hydrolyzed in an ethanol aqueous solution, alumina particles are added, and then the mixture is stirred in a water bath at 60-65 DEG C for 2 h, filtered, and dried to obtain aminated alumina; hexagonal boron nitride is dispersed in deionized water, two-dimensional titanium carbide is added, and then the mixture is ultrasonically treated for 20-30 min, filtered, and cleaned; the mixture is stirred in a sodium hydroxide solution in an oil bath at 120-125 DEG C for 12 h, filtered, and dried to obtain hydroxylated composite particles; the aminated alumina and the hydroxylated composite particles are sequentially placed in deionized water, and the pH is adjusted to 4-5; the mixture is stirred for 5 h, filtered, and dried; and the mass ratio of the alumina, the hexagonal boron nitride, and the two-dimensional titanium carbide is (2-5):1:1; The plating solution for the second nickel plating in the two times of nickel plating in S3 includes 20-30 g / L of NiSO4·7H2O, 8-12 g / L of NaH2PO2·H2O, 8-12 g / L of CH3COONa, 8-10 g / L of Na3C6HO7·2H2O, 1-2 g / L of Na2MoO4, 10-20 g / L of enhanced particles II, and 0.03-0.05 g / L of octadecyl trimethyl ammonium bromide; the plating solution has a temperature of 80-90 DEG C and a pH of 4-5; and the deposition time is 30-50 min; The preparation steps of the reinforcing particle II are as follows: placing cerium nitrate hexahydrate, 4,4'-diphenyldicarboxylic acid and 2-fluorobenzoic acid in an aqueous N,N-dimethylformamide solvent, adding nitric acid, ultrasonicating for 30-40 min, then heating to 105 DEG C and reacting for 72 h, cooling to room temperature, filtering and drying, placing in a hydrolysis solution of 3-aminopropyltriethoxysilane, stirring in a water bath at 60-65 DEG C for 2 h, filtering and drying to obtain an aminated rare earth framework, and sequentially placing the aminated rare earth framework and the hydroxylated composite particle in deionized water, adjusting the pH to 4-5, stirring for 5 h, and filtering and drying; the molar ratio of cerium nitrate hexahydrate, 4,4'-diphenyldicarboxylic acid and 2-fluorobenzoic acid is (0.5-1.5):1:30; and the mass ratio of the aminated rare earth framework and the hydroxylated composite particle is (1-2):

1.

2. The method of claim 1, wherein the high-precision stainless steel strip for an electronic chip is prepared by the steps of: The chemical composition of the hot-rolled steel strip of S1 includes, by mass percent: 0.04-0.065% C, 0.8-1.0% Si, 1.0-1.3% Mn, 0.004-0.006% P, 0.002-0.005% S, 18-20% Cr, 8-10% Ni, 0.008% Al, 0.07% Nb, 0.03-0.05% Mo, 0.0002-0.0003% O, 0.03-0.05% N, 0.016% Ce, and the balance being Fe. ​ 3. The method for preparing a high-precision stainless steel strip for electronic chips according to claim 1, characterized in that, The initial forging temperature of S1 is 1150 DEG C, and the final forging temperature is 850 DEG C; a blank with a thickness of 20-30 mm is obtained by forging; the specific process parameters of the solution treatment are as follows: the solution temperature is 1150-1250 DEG C, and the solution time is 2-3 h; the hot rolling is performed in 4-6 passes, the opening rolling temperature is 1150-1200 DEG C, the final rolling temperature is 850-1050 DEG C, and the total hot rolling reduction is 90-94%.

4. The method of claim 1, wherein the high-precision stainless steel strip for an electronic chip is prepared by the steps of: S2 is rolled in 3-5 passes in the first rolling, the reduction of each pass is 20-25%; S2 is rolled in 12-15 passes in the second rolling, the reduction of each pass is 10-18%; the first annealing temperature is 600-650 DEG C, and the annealing time is 10-12 h; the second annealing temperature is 450-500 DEG C, and the annealing time is 16-18 h. ​ 5. The method of claim 1, wherein the high-precision stainless steel strip for an electronic chip is prepared by the steps of: S3 is cold-rolled in 12-15 passes in the third rolling, the reduction of each pass is 3-5%; the aging treatment temperature is 200-220 DEG C, and the aging treatment time is 10-12 h. ​ 6. A high-precision stainless steel strip for electronic chips, characterized by Prepared by the preparation method of any one of claims 1-5.

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