Defect-free heat treatment method for nickel-based corrosion-resistant alloy thin strip
By employing a graded homogenization solution heat treatment method, the problem of white spot defects on the surface of nickel-based corrosion-resistant alloy strips was solved, thereby improving the surface quality of the strips and making them suitable for nuclear power, superconducting, and semiconductor equipment.
Patent Information
- Application Number
- CN202610417056.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-04-01
- Publication Date
- 2026-06-26
AI Technical Summary
Existing heat treatment methods for nickel-based corrosion-resistant alloy strips cannot fully dissolve the μ phase and carbides, resulting in white spot defects on the surface.
The graded homogenization solution heat treatment method is adopted, which includes three stages: the first stage is to eliminate residual stress from cold rolling at 800~850℃, the second stage is to completely dissolve the μ phase and carbides at 1180~1220℃, and the third stage is to rapidly cool to avoid precipitated phases, combined with surface cleaning to remove oil stains, so as to ensure the surface quality of the strip.
It effectively avoids the white spot defect on the surface of nickel-based corrosion-resistant alloy strips, meets the stringent requirements of industries such as nuclear power, superconductivity, and semiconductor equipment, and ensures optimized strip microstructure and performance.
Smart Images
Figure CN122279440A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of nickel-based corrosion-resistant alloy production technology, specifically relating to a defect-free heat treatment method for nickel-based corrosion-resistant alloy strips. Background Technology
[0002] Nickel-based corrosion-resistant alloys such as N10276 are known as universal corrosion-resistant alloys, suitable for harsh environments in numerous fields such as chemical manufacturing, power plant flue gas desulfurization, nuclear energy, papermaking, and marine development. They are considered one of the most widely used nickel-based corrosion-resistant alloys in the world. In existing technologies, the heat treatment of nickel-based corrosion-resistant alloy strips often employs single-stage solution treatment, such as the common method of holding at 1100~1150℃ followed by rapid cooling. However, this method has the following problems: the conventional solution temperature ≤1150℃ cannot fully dissolve the μ phase, carbides, and other precipitated phases in the alloy, leading to white spot defects on the surface of the nickel-based corrosion-resistant alloy strip. Figure 1 As shown. Summary of the Invention
[0003] To address the aforementioned technical problems in the prior art, this invention provides a defect-free heat treatment method for nickel-based corrosion-resistant alloy strips, comprising feeding the surface-cleaned cold-rolled nickel-based corrosion-resistant alloy strip into a bright annealing furnace for graded homogenization solution heat treatment, wherein the solution heat treatment is carried out in the following three stages: In the first stage, the nickel-based corrosion-resistant alloy strip is heated to 800~850℃ and held for 15~30s to eliminate residual stress from cold rolling, so that the structure of the cold-rolled strip can be restored and avoid the defects of coarse grains and rough surface caused by excessive annealing time in the high-temperature section. In the second stage, the nickel-based corrosion-resistant alloy strip is heated to 1180~1220℃ and held for 20~40s to allow the cold-rolled structure to recrystallize, the grains to grow uniformly, and the μ phase and carbides to completely dissolve. In the third stage, the nickel-based corrosion-resistant alloy strip is rapidly cooled to below 400°C at a cooling rate of ≥100°C / s to quickly pass through the precipitation temperature window of the μ phase and carbides, thus avoiding the precipitation of the precipitated phase.
[0004] Furthermore, in the above-mentioned defect-free heat treatment method for nickel-based corrosion-resistant alloy strips, the surface cleaning of the nickel-based corrosion-resistant alloy strips includes first performing degreasing cleaning to remove surface oil stains, then rinsing with clean water and drying, to prevent oil stains from reacting with the strip in the bright annealing furnace and causing surface defects.
[0005] Furthermore, the above-mentioned defect-free heat treatment method for nickel-based corrosion-resistant alloy strips is used for high-temperature heat treatment of corrosion-resistant alloy strips with a thickness ≤0.05mm.
[0006] The defect-free heat treatment method for nickel-based corrosion-resistant alloy strips of the present invention has the following advantages and beneficial effects: The defect-free heat treatment method for nickel-based corrosion-resistant alloy strips of the present invention employs a graded solution treatment approach. In the first stage, the heat treatment temperature is controlled at 800~850℃ to eliminate residual stress from cold rolling, creating conditions for subsequent high-temperature annealing and avoiding defects such as coarse grains and rough surfaces caused by excessively long annealing time in the high-temperature section. In the second stage, the heat treatment temperature is controlled at 1180~1220℃ to ensure that the precipitated phases of the nickel-based corrosion-resistant alloy strip are completely dissolved at ≥1180℃. In the third stage, rapid cooling is performed to quickly pass through the precipitation temperature window of the μ phase and carbides, thereby avoiding white spot defects on the surface of the nickel-based corrosion-resistant alloy strip. This method is fully compatible with the stringent requirements for the surface quality of corrosion-resistant alloys in industries such as nuclear power, superconductivity, and semiconductor equipment. Attached Figure Description
[0007] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for further understanding of the embodiments of the present invention and constitute a part of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings: Figure 1 The image shows the metallographic structure of a nickel-based corrosion-resistant alloy strip after conventional heat treatment, revealing obvious white spot defects on the surface. Figure 2 Metallographic images of nickel-based corrosion-resistant alloy strips treated with the defect-free heat treatment method of the present invention show no surface white spot defects. Detailed Implementation
[0008] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.
[0009] This invention aims to provide a novel defect-free heat treatment method for nickel-based corrosion-resistant alloy thin strips, based on the optimization of a graded homogenization solution treatment process, to solve the problem of white spot defects on the surface of nickel-based corrosion-resistant alloy thin strips. Specifically, the defect-free heat treatment method for nickel-based corrosion-resistant alloy thin strips of this invention includes: After surface cleaning, the cold-rolled nickel-based corrosion-resistant alloy strip is sent to a bright annealing furnace for graded homogenization solution heat treatment, which is carried out in the following three stages: In the first stage, the nickel-based corrosion-resistant alloy strip is heated to 800~850℃ and held for 15~30s to eliminate residual stress from cold rolling, so that the microstructure of the cold-rolled strip can be restored, creating conditions for high-temperature annealing and avoiding defects such as coarse grains and rough surface caused by excessively long annealing time in the high-temperature section. In the second stage, the nickel-based corrosion-resistant alloy strip is heated to 1180~1220℃ and held for 20~40s to allow the cold-rolled structure to recrystallize and the grains to grow uniformly. Within this temperature range, the μ phase and carbides are completely dissolved, so that the strip structure reaches the optimal state. In the third stage, the nickel-based corrosion-resistant alloy strip is rapidly cooled to below 400°C at a cooling rate of ≥100°C / s. This allows it to quickly pass through the precipitation temperature window of the μ phase and carbides, minimizing the precipitation of the precipitated phase and thus preventing white spot defects on the surface of the strip.
[0010] Preferably, the surface cleaning of the nickel-based corrosion-resistant alloy strip includes first performing degreasing cleaning to remove surface oil, then rinsing with clean water and drying to prevent oil from reacting with the strip in the bright annealing furnace and causing surface defects.
[0011] As one specific implementation, the defect-free heat treatment method for nickel-based corrosion-resistant alloy strips of the present invention is used for high-temperature heat treatment of corrosion-resistant alloy strips with a thickness ≤0.05mm.
[0012] The defect-free heat treatment method for nickel-based corrosion-resistant alloy strips of the present invention employs a staged solution treatment approach. In the first stage, the heat treatment temperature is controlled at 800~850℃ to eliminate residual stress from cold rolling, creating conditions for subsequent high-temperature annealing and avoiding defects such as coarse grains and rough surfaces caused by excessively long annealing times in the high-temperature section. In the second stage, the heat treatment temperature is controlled at 1180~1220℃ to ensure complete dissolution of the precipitated phases in the nickel-based corrosion-resistant alloy strip at ≥1180℃. In the third stage, rapid cooling is performed to quickly pass through the precipitation temperature window of the μ phase and carbides, thereby preventing white spot defects on the surface of the nickel-based corrosion-resistant alloy strip. Figure 2 As shown, it is fully compatible with the stringent requirements of the nuclear power, superconducting, and semiconductor equipment industries for the surface quality of corrosion-resistant alloys.
[0013] The following detailed description of the defect-free heat treatment method for nickel-based corrosion-resistant alloy strips of the present invention, with reference to specific embodiments, provides a detailed explanation.
[0014] Example 1 The specific process of the defect-free heat treatment method for nickel-based corrosion-resistant alloy strips in Example 1 is as follows: (1) Degrease and clean the 0.05mm thick nickel-based corrosion-resistant alloy N10276 strip to remove surface oil, and then send it into a bright annealing furnace; (2) In the first stage of solution heat treatment, the nickel-based corrosion-resistant alloy strip is heated to 800℃ and held for 15s; (3) In the second stage of solution heat treatment, the nickel-based corrosion-resistant alloy strip is heated to 1180℃ and held for 40s; (4) In the third stage of solution heat treatment, the nickel-based corrosion-resistant alloy strip is rapidly cooled to 350°C at a cooling rate of 110°C / s.
[0015] Example 2 The specific process of the defect-free heat treatment method for nickel-based corrosion-resistant alloy strips in Example 2 is as follows: (1) The 0.04mm thick nickel-based corrosion-resistant alloy N10276 strip is degreased and cleaned to remove surface oil stains, and then sent into a bright annealing furnace; (2) In the first stage of solution heat treatment, the nickel-based corrosion-resistant alloy strip is heated to 820°C and held for 20 seconds; (3) In the second stage of solution heat treatment, the nickel-based corrosion-resistant alloy strip is heated to 1200℃ and held for 30s; (4) In the third stage of solution heat treatment, the nickel-based corrosion-resistant alloy strip is rapidly cooled to 360°C at a cooling rate of 120°C / s.
[0016] Example 3 The specific process of the defect-free heat treatment method for nickel-based corrosion-resistant alloy strips in Example 3 is as follows: (1) The 0.03mm thick nickel-based corrosion-resistant alloy N10276 strip is degreased and cleaned to remove surface oil stains, and then sent into a bright annealing furnace; (2) In the first stage of solution heat treatment, the nickel-based corrosion-resistant alloy strip is heated to 850°C and held for 30 seconds; (3) In the second stage of solution heat treatment, the nickel-based corrosion-resistant alloy strip is heated to 1220℃ and held for 35s; (4) In the third stage of solution heat treatment, the nickel-based corrosion-resistant alloy strip is rapidly cooled to 380°C at a cooling rate of 130°C / s.
[0017] Actual production testing showed that the nickel-based corrosion-resistant alloy strips treated in Examples 1-3 had uniform grain size and no white spot defects on the surface, fully meeting the stringent requirements for surface quality of corrosion-resistant alloys in industries such as nuclear power, superconducting, and semiconductor equipment.
[0018] In the description of this specification, references to terms such as "embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, those skilled in the art can combine or combine the different embodiments or examples described in this specification and the features therein without causing contradiction.
[0019] It should be noted that, unless otherwise specified, the terms used herein have the meanings commonly understood by those skilled in the art. Furthermore, when a numerical range is disclosed herein, the range is considered continuous and includes the minimum and maximum values of the range, as well as every value between such minimum and maximum. Further, when the range refers to integers, it includes every integer between the minimum and maximum values of the range. Moreover, when multiple ranges are provided to describe features, the ranges may be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges to which they are incorporated.
[0020] It should also be noted that, in this document, the term "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device.
[0021] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the present invention.
Claims
1. A defect-free heat treatment method for nickel-based corrosion-resistant alloy thin strips, characterized in that, The defect-free heat treatment method for nickel-based corrosion-resistant alloy strip includes sending the surface-cleaned cold-rolled nickel-based corrosion-resistant alloy strip into a bright annealing furnace for graded homogenization solution heat treatment, which is carried out in the following three stages: In the first stage, the nickel-based corrosion-resistant alloy strip is heated to 800~850℃ and held for 15~30s to eliminate residual stress from cold rolling, so that the structure of the cold-rolled strip can be restored and avoid the defects of coarse grains and rough surface caused by excessive annealing time in the high-temperature section. In the second stage, the nickel-based corrosion-resistant alloy strip is heated to 1180~1220℃ and held for 20~40s to allow the cold-rolled structure to recrystallize, the grains to grow uniformly, and the μ phase and carbides to completely dissolve. In the third stage, the nickel-based corrosion-resistant alloy strip is rapidly cooled to below 400°C at a cooling rate of ≥100°C / s to quickly pass through the precipitation temperature window of μ phase and carbides, thus avoiding the precipitation of the precipitated phase.
2. The defect-free heat treatment method for nickel-based corrosion-resistant alloy thin strips as described in claim 1, characterized in that, The surface cleaning of nickel-based corrosion-resistant alloy strips includes first degreasing and cleaning to remove surface oil, then rinsing with clean water and drying to prevent oil from reacting with the strip in the bright annealing furnace and causing surface defects.
3. The defect-free heat treatment method for nickel-based corrosion-resistant alloy thin strips as described in claim 1, characterized in that, The defect-free heat treatment method for nickel-based corrosion-resistant alloy strips is used for high-temperature heat treatment of corrosion-resistant alloy strips with a thickness ≤0.05mm.