High-temperature-resistant and corrosion-resistant nickel-based alloy hot-rolled steel plate and preparation method thereof

Abstract

The application discloses a high-temperature-resistant and corrosion-resistant nickel-based alloy hot-rolled steel plate and a preparation method thereof. The high-temperature-resistant and corrosion-resistant nickel-based alloy hot-rolled steel plate comprises the following components in percentage by weight: C: 0.01-0.06%, Cr: 18%-30%, Si: less than or equal to 0.3%, Mn: less than or equal to 0.5%, Ni: 25-40%, Mo: 0.5-3.0%, Nb: 0.5-2.0%, N: 0.2-0.4%, Zr: 0.01-0.15%, B: 0.001-0.006%, P: less than or equal to 0.010%, S: less than or equal to 0.010%, and the balance of Fe and inevitable impurities. The application smelts through component design and an electric arc furnace + refining + electroslag remelting smelting mode, and improves the component and organizational performance uniformity problems caused by ingot expansion through optimization of heating and deformation processes, so as to meet the requirements of large equipment on high-temperature-resistant and corrosion-resistant alloy materials.

Description

Technical Field

[0001] This invention relates to the field of nickel-based alloy preparation, and more specifically, to a hot-rolled nickel-based alloy steel plate suitable for long-term service in high-temperature corrosive environments and its preparation method. Background Technology

[0002] In the nickel-based alloy product system, alloys are generally divided into high-temperature alloys and corrosion-resistant alloys according to their application fields. For example, high-temperature components for aerospace and heating furnace components use nickel-based or cobalt-based high-temperature alloys, while components operating in highly corrosive media at relatively low temperatures generally use corrosion-resistant alloys. Although their composition series are similar, their microstructure control and operating principles differ significantly. For higher-temperature operations, age-hardening nickel-based alloys with added alloying elements such as Nb, Al, Ti, and W are typically selected. The principle is that the alloy is age-hardened to form strengthening phases such as γ', thereby improving its high-temperature long-term performance. When the operating temperature is relatively low and corrosive conditions are present, solid-solution-hardened nickel-based alloys are generally selected. These alloys are characterized by the absence of age-hardening elements or the presence of only certain amounts of elements such as Al, Ti, and Cr. Although their high-temperature strength is significantly lower than that of age-hardened nickel-based alloys, they possess excellent corrosion resistance.

[0003] my country's high-temperature alloy products have been developed relatively early, forming its own system in terms of product series, standards, and applications. However, due to the influence of domestic application needs, corrosion-resistant alloys have long used internationally accepted standards and product systems. Through decades of development, my country has become a world leader in many fields such as nuclear power and new energy, resulting in a mismatch between the required materials and the industry's technological development. The service environment is becoming increasingly complex, and the operating conditions are no longer simply high-temperature or corrosive environments, making material selection a prominent issue that needs to be addressed. For example, in the field of new energy solar power generation, the main equipment operates at around 600℃ and a pressure of 1.2–4.0 MPa, which is a typical high-temperature operating condition. However, under actual service conditions, there is a risk of silicon tetrachloride corrosion. Moreover, this type of equipment is large in size, requires heavy materials, and is characterized by high manufacturing difficulty and high material requirements.

[0004] Among the widely used high-temperature resistant materials, besides heat-resistant carbon steel and stainless steel, there are many solid solution-strengthened nickel-based alloys used in high-temperature environments, such as the 800H series and N06601. Other age-hardening high-temperature alloys are also frequently used in such applications. However, when corrosion risks exist in actual working conditions, such as the presence of highly corrosive media in the material environment during shutdown, these alloys are at risk of rapid failure, posing significant safety hazards. Therefore, material design must consider not only the material's long-term high-temperature service capability but also address its corrosion risks. Furthermore, these types of equipment are typically large-scale, requiring substantial individual plates, necessitating solutions to various challenges in the manufacturing process.

[0005] A search revealed numerous studies on materials resistant to high temperatures and strong corrosive media. However, since these are two distinct research directions, studies considering the combined properties of both are relatively few. Furthermore, research on the production of large single-piece and large-slab steel plates primarily focuses on carbon steel, with little attention paid to nickel-based alloys. Much technology concentrates on nickel-based alloy composite plates, such as Chinese patent application CN200610054330.4. These alloys are characterized by a high Al content (3.8–7.5 wt%), with some W added to improve high-temperature strength and oxidation resistance. However, while these alloys are characterized by excellent high-temperature performance, they do not consider corrosion resistance. Moreover, due to the high alloy content, there are quality risks associated with large-scale production when manufacturing large single-piece steel plates.

[0006] In existing technologies, civilian nickel-based alloys used at temperatures below 800℃ typically employ high-alloy materials with superior heat resistance. Considering the requirements for long-term use at high temperatures, the corrosion resistance of these alloys is generally limited. Furthermore, in the manufacture of major equipment, the design of steel composition, ingot shape, and unit weight restrict the production of large single-weight steel plates. With the increasing size of equipment and the complexity of service conditions, higher requirements are being placed on the dimensions of high-temperature nickel-based alloy plates, as well as on the material's capabilities under complex working conditions, especially in corrosive media.

[0007] In view of the above, there is an urgent need to develop a high-temperature and corrosion-resistant nickel-based alloy that can meet the requirements of industrial production for high-temperature corrosion-resistant alloy materials in large equipment. Summary of the Invention

[0008] To address the aforementioned deficiencies in existing technologies, the present invention aims to provide a high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel plate and its preparation method. Through compositional design and the use of an electric arc furnace + refining + electroslag remelting smelting process, and by optimizing heating and deformation processes, a large-weight nickel-based alloy hot-rolled steel plate is prepared, improving the uniformity of composition and microstructure caused by ingot enlargement, thereby meeting the requirements of industrial production for high-temperature and corrosion-resistant alloy materials in large-scale equipment.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] The first aspect of this invention provides a high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel plate, comprising the following components by weight percentage: C: 0.01-0.06%, Cr: 18%-30%, Si≤0.3%, Mn≤0.5%, Ni: 25-40%, Mo: 0.5-3.0%, Nb: 0.5-2.0%, N: 0.2-0.4%, Zr: 0.01-0.15%, B: 0.001-0.006%, P≤0.010%, S≤0.010%, with the balance being Fe and unavoidable impurities.

[0011] Preferably, in the high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel sheet, P+S≤0.015wt% is satisfied.

[0012] Preferably, the high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel plate has a yield strength Rp at 600°C. 0.2 ≥180MPa, tensile strength R m ≥510MPa, elongation A 50％ ≥49%; and / or

[0013] The high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel plate has a tensile strength Rm≥370MPa at 800℃.

[0014] A second aspect of the present invention provides a method for preparing a high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel plate as described in the first aspect of the present invention, comprising the following steps:

[0015] S1, the electrode is obtained by electric arc furnace smelting and AOD refining, and the electrode is then electroslag remelted under argon protection to obtain electroslag ingot;

[0016] S2, the electroslag ingot is subjected to homogenization annealing treatment, and then forged to obtain a forging billet;

[0017] S3, the forging billet is rolled into a thick plate using the rolling principle of alternating small deformation and large deformation, and then heat-treated and finished to obtain a high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel plate.

[0018] Preferably, in step S1:

[0019] The electrode weighs more than 15 tons; and / or

[0020] The electroslag ingot is a round ingot with a diameter of 900-1000 mm and a weight of ≥10 tons.

[0021] Preferably, in step S2, during the homogenization annealing process, the annealing temperature is 1220~1280℃ and the annealing time is ≥48h.

[0022] Preferably, in step S2, the forging blank is formed by upsetting and drawing.

[0023] Preferably, in step S3, the forging billet is first subjected to pre-forging heat treatment at a temperature of 1200–1280°C.

[0024] Preferably, in step S3:

[0025] During the thick plate rolling process, the initial rolling temperature is 1100–1200℃, and the final rolling temperature is ≥950℃; and / or

[0026] In the thick plate rolling process, the deformation amount of the first pass is 3-5%, the deformation amount of the second and third passes is 15-25%, the deformation amount of the intermediate passes is 10-15%, and the deformation amount of the last pass is 15-20%.

[0027] Preferably, in step S3, the thickness of the high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel plate is 10-70 mm, and the single weight is ≥7 tons.

[0028] The principle of the composition design of the high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel plate of this invention:

[0029] The alloy of this invention is a nickel-chromium-iron alloy. Ni is the basic element for austenitization and is very stable in oxidizing environments. Adding a certain amount of Cr can greatly improve the material's oxidation resistance and resistance to gas corrosion in the Ni-Cr austenitic solid solution. Secondly, considering that the alloy is used in long-term high-temperature environments, the high-temperature passivation film formed by Cr is very stable and can improve the oxidation resistance of the alloy surface. However, the Cr content should not be too high, as too high a content will affect the material's processing performance and cause difficulties in the alloy's rolling and other production processes. Therefore, the Cr content is controlled between 18% and 30 wt%.

[0030] Carbon (C) plays a crucial role in improving the strength of nickel-based alloys. Generally, in high-temperature alloys, the C content is higher than 0.05 wt%. However, a high C content inevitably leads to the formation of various types of carbides during subsequent processing and heat treatment, affecting the material's corrosion resistance. Therefore, in this invention, the carbon content is controlled at a relatively low level, ranging from 0.01 to 0.06 wt%. To improve the high-temperature strength of this alloy, a certain amount of nitrogen (N) is added. Nitrogen in austenite has good solid solution strengthening effects and is inexpensive, thus it can play a role in strengthening Ni and other alloys. However, the addition of N should not be too high, as excessive N will affect the alloy's plasticity and increase the risk of other defects in the steel. Therefore, in this invention, its content is controlled at 0.2 to 0.4 wt%.

[0031] Meanwhile, the addition of certain amounts of Mo and Nb to the alloy of this invention further improves its high-temperature strength and long-term high-temperature performance. Mo also enhances the alloy's resistance to pitting corrosion. To improve the grain boundary stability and strength of the alloy and enhance its machinability, small amounts of Zr and B are added. The addition of Zr can improve the high-temperature strength of the alloy. This type of element generally accumulates at grain boundaries and between dendrites in the alloy. Appropriate addition can significantly improve the high-temperature strength of the material. At the same time, the addition of this type of element can improve the morphology of inclusions in the alloy, enhance the overall high-temperature oxidation resistance of the material, and improve the stability of the surface oxide layer, thereby improving the oxidation resistance of the material in dynamic oxidation environments. However, excessive addition of this type of element will cause a rapid decrease in the material's ductility and toughness, affecting its machinability. Therefore, in this invention, Zr is controlled within the range of 0.01–0.15 wt%, and B is controlled within the range of 0.001–0.006 wt%. The content of impurity elements such as P and S is controlled in the alloy. High levels of P will significantly reduce the weldability of the material.

[0032] The high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel plate and its preparation method of the present invention have the following beneficial effects:

[0033] 1. By balancing the alloy's composition and reducing the carbon content, the alloy's resistance to intergranular corrosion is improved. Simultaneously, the addition of alloying elements such as molybdenum (Mo) enhances its resistance to pitting corrosion. Furthermore, the addition of appropriate amounts of chromium (Cr) and nitrogen (Nb) improves the alloy matrix's oxidation resistance under high-temperature, long-term service conditions, meeting the requirements for long-term use at 800℃.

[0034] 2. Adding a certain amount of nitrogen element can improve the strength of the material under high-temperature service conditions, thereby reducing the cost of the alloy while increasing its strength. Adding trace amounts of elements such as Zr and B can improve the high-temperature strength and high-temperature creep resistance of the material, as well as the machinability of the alloy, and can also greatly improve the cyclic performance of the material under long-term high-temperature service conditions.

[0035] 3. A process for electroslag remelting and homogenization of large-size electroslag ingots and a hot deformation process that matches large single-weight steel plates were proposed. This can improve problems such as segregation caused by ingot enlargement, improve internal quality, and reduce the quality risk of materials in actual use.

[0036] 4. Through appropriate composition design, the alloy of this invention can be smelted using a large electric arc furnace + refining + electroslag remelting method, which not only improves the yield and saves production costs, but also has positive practical significance for the supply capacity of large-scale nickel-based alloy materials. Detailed Implementation

[0037] To better understand the above-mentioned technical solutions of the present invention, the technical solutions of the present invention will be further described below in conjunction with embodiments.

[0038] Currently, the materials used in high-temperature heating furnaces or reactors in this field in China are limited by composition systems and usage practices, and all adopt conventional high-temperature alloys. Although these alloys have excellent high-temperature long-term service performance and can meet the conventional use requirements of the equipment, their corrosion resistance is generally poor, posing a risk of corrosion failure during actual use. Furthermore, the high-temperature alloy materials used in this field are limited by the characteristics of composition design, resulting in small ingot sizes that cannot meet the requirements of large-scale equipment production with large single-unit weights. Therefore, the gradually deteriorating operating conditions also lead to a problem where the high-temperature resistance and corrosion resistance of commonly used heat-resistant nickel-based alloys cannot be well matched.

[0039] Therefore, this invention provides a high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel plate, comprising the following components by weight percentage: C: 0.01–0.06%, Cr: 18%–30%, Si ≤ 0.3%, Mn ≤ 0.5%, Ni: 25–40%, Mo: 0.5–3.0%, Nb: 0.5–2.0%, N: 0.2–0.4%, Zr: 0.01–0.15%, B: 0.001–0.006%, P ≤ 0.010%, S ≤ 0.010%, with the balance being Fe and unavoidable impurities. The composition of the high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel plate also satisfies P + S ≤ 0.015 wt%.

[0040] The aforementioned high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel sheet has a yield strength Rp of 600℃. 0.2 ≥180MPa, tensile strength R m ≥510MPa, elongation A 50％ ≥49%. This high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel plate has a tensile strength Rm≥370MPa at 800℃.

[0041] The above-mentioned high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel sheet is prepared by the following method:

[0042] S1, the electrode is obtained by electric arc furnace smelting and AOD refining, and the electrode is then electroslag remelted under argon protection to obtain electroslag ingot;

[0043] The specific process is as follows: Based on the composition of the high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel plate, the raw materials are proportioned, and then produced by electric arc furnace melting and AOD refining. The resulting cylindrical electrodes are cast, with each cast electrode weighing more than 15 tons. The electrodes are then subjected to electroslag remelting under argon protection to finally obtain electroslag ingots. These electroslag ingots are round ingots with a diameter of 900-1000 mm and a weight of more than 10 tons.

[0044] S2, the electroslag ingot is subjected to homogenization annealing treatment, and then forged to obtain a forging billet;

[0045] The specific process is as follows: In order to reduce element segregation in the alloy, the large steel ingot needs to be homogenized by annealing, with an annealing temperature of 1220~1280℃ and an annealing time of ≥48h; then, a forging billet is obtained by forging, which is produced by upsetting and drawing.

[0046] S3, the forging billet is rolled into a thick plate using the rolling principle of alternating small deformation and large deformation, and then heat-treated and finished to obtain a high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel plate.

[0047] The specific process is as follows: To improve the uniformity of the microstructure, the forging billet is first subjected to pre-forging heat treatment before rolling, with a heating temperature of 1200-1280℃; then, the forging billet is rolled into a thick plate using the rolling principle of alternating small and large deformations, with an initial rolling temperature of 1100-1200℃ and a final rolling temperature ≥950℃; during the thick plate rolling process, the deformation requirements in the rolling strategy are as follows: the deformation amount in the first pass is 3-5%, the deformation amount in the second and third passes is 15-25%, the deformation amount in the intermediate passes is 10-15%, and the deformation amount in the last pass is 15-20%.

[0048] After rolling and forming, heat treatment and finishing processes are carried out to finally produce high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel plates with a thickness of 10-70mm and a single weight of ≥7 tons.

[0049] The high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel sheet prepared above has a yield strength R at 600℃. p0.2 ≥180MPa, tensile strength R m ≥510MPa, elongation A 50％ ≥49%; In a further preferred embodiment, the yield strength R of the high-temperature corrosion resistant nickel-based alloy hot-rolled steel sheet at 600°C is... p0.2 The tensile strength is 180–220 MPa, and the tensile strength R is... m The strength is 510–570 MPa, and the elongation is A. 50％ The tensile strength R of this high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel plate at 800℃ is 49-55%. m ≥370MPa; In a further preferred embodiment, the yield strength R of the high-temperature corrosion resistant nickel-based alloy hot-rolled steel sheet is ≥370MPa; p0.2 The tensile strength is 119–145 MPa, and the tensile strength R is... m The strength is 3710–430 MPa, and the elongation is A. 50％ It ranges from 50% to 66%.

[0050] The average oxidation rate of this high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel sheet does not exceed 0.015 g / m at temperatures of 500℃ and 800℃. 2 • h. The intergranular corrosion rate of hot-rolled nickel-based alloy steel sheets with high temperature and corrosion resistance is <0.5 mm / year (evaluated according to ASTM G28 A method).

[0051] The following section provides a further description of the high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel plate and its preparation method, using specific examples.

[0052] Example

[0053] Examples 1-4 were prepared using the preparation method of the present invention for high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel plates. The chemical composition of the high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel plates is shown in Table 1, and the parameters in the preparation process are shown in Table 2. The mechanical properties of the high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel plates were tested and are shown in Table 3. The oxidation resistance of the high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel plates is shown in Table 4. The intergranular corrosion and pitting corrosion of the high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel plates were evaluated using ASTM G28 A method and ASTM G48 method (room temperature 72h), respectively, and the results are shown in Table 5.

[0054] Comparative Example

[0055] Comparative Examples 1 and 2 are two commonly used high-temperature nickel-based alloys, produced using conventional manufacturing processes. Comparative Example 1 is a typical N08810 series alloy used under high-temperature conditions, and Comparative Example 2 is a long-term heat-resistant alloy N06601. The chemical composition is shown in Table 1, the specific process parameters are shown in Table 2, the mechanical properties are shown in Table 3, and the oxidation resistance is shown in Table 4. The high-temperature nickel-based alloys of Comparative Examples 1 and 2 were evaluated for intergranular corrosion and pitting corrosion using the same methods as in Examples 1-4, and the results are shown in Table 5.

[0056] Table 1. Chemical composition (wt%) of materials in the examples and comparative examples.

[0057]

[0058] Table 2 Preparation parameters in the examples and comparative examples

[0059]

[0060]

[0061] Table 3. High-temperature mechanical property parameters of the examples and comparative examples.

[0062]

[0063] Table 4. Oxidation resistance of alloys in the examples and comparative examples.

[0064]

[0065] Table 5 Corrosion performance of the examples and comparative examples

[0066]

[0067]

[0068] As shown in Table 2, Examples 1-4 and Comparative Examples 1-2 both adopted electric arc furnace smelting + AOD refining. The casting mode is shown in Table 2. Examples 1-4 and Comparative Example 2 both adopted electroslag remelting for secondary smelting. Among them, Examples 1-4 were homogenized and annealed and then forged into billets, while Comparative Examples 1-2 were directly forged into billets. Then all were hot rolled into steel plates. The specifications of the finished steel plates are shown in Table 2. The hot-rolled high-temperature and corrosion-resistant nickel-based alloy steel plates obtained in Examples 1-4 have a thickness in the range of 10-70 mm and a single weight ≥ 7 tons, which is larger than the single weight and specifications of the steel plates obtained in Comparative Examples 1-2.

[0069] As shown in Tables 3-5, the high-temperature instantaneous tensile strength of the alloys in Examples 1-4 is significantly higher than that of the alloy in Comparative Example 1, and comparable to that of the alloy in Comparative Example 2. Regarding high-temperature oxidation resistance, the high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel plates in Examples 1-4 exhibit good high-temperature oxidation resistance, with an average oxidation rate of <0.015 g / m at 500℃. 2 •h (specifically between 0.009 and 0.012 g / m 2 The average oxidation rate at 800℃ is ≤0.015 g / m³ (·h). 2 •h (specifically between 0.009 and 0.015 g / m 2 (h); As shown in Table 4, the high-temperature oxidation resistance of the hot-rolled nickel-based alloy steel plates in Examples 1-4 is better than that of the steel plate in Comparative Example 1, and comparable to that of the steel plate in Comparative Example 2. In terms of corrosion resistance, the hot-rolled nickel-based alloy steel plates in Examples 1-4 are significantly superior to those in Comparative Examples 1-2.

[0070] In summary, the high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel plate of this invention has been successfully used in high-temperature treatment furnace components in China with operating temperatures below 800℃. Compared to existing heat-resistant nickel-based alloys, it exhibits superior high-temperature oxidation resistance and creep resistance, along with excellent corrosion resistance, solving corrosion failure problems under complex operating conditions. After actual use, the equipment still maintains good serviceability. Furthermore, the alloy of this invention is ingot-made using an electric arc furnace + refining + electroslag remelting process. Through homogenization treatment, the ingot size can be increased to a certain extent, enabling the manufacture of large single-weight plates, reducing production costs, increasing production efficiency, and providing large-size materials. This significantly reduces the number of welds in the equipment manufacturing process, lowering manufacturing and usage risks. Its successful design and development will bring significant social and economic benefits to the application of high-performance special alloys in China.

[0071] Those skilled in the art should recognize that the above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Any variations or modifications to the above embodiments that are within the spirit and essence of the present invention will fall within the scope of the claims of the present invention.

Claims

1. A method for preparing a high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel plate, characterized in that, High-temperature and corrosion-resistant nickel-based alloy hot-rolled steel plates comprise the following components by weight percentage: C: 0.01–0.06%, Cr: 18%–30%, Si≤0.3%, Mn≤0.5%, Ni: 25–40%, Mo: 0.5–3.0%, Nb: 0.5–2.0%, N: 0.2–0.4%, Zr: 0.01–0.15%, B: 0.001–0.006%, P≤0.010%, S≤0.010%, with the balance being Fe and unavoidable impurities. In the aforementioned high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel plate, the P+S content is ≤ 0.015 wt%. The high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel plate has a yield strength Rp at 600℃. 0.2 ≥180 MPa, tensile strength R m ≥510 MPa, elongation A 50% ≥49%; The high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel plate has a tensile strength Rm ≥ 370 MPa at 800℃. The preparation method includes the following steps: S1, the electrode is obtained by electric arc furnace smelting and AOD refining, and the electrode is then electroslag remelted under argon protection to obtain electroslag ingot; S2, the electroslag ingot is subjected to homogenization annealing treatment, and then forged to obtain a forging billet; S3, employing a rolling principle of alternating small and large deformations, the forged billet is rolled into a thick plate, followed by heat treatment and finishing to obtain a high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel plate. In step S3, the forging billet is first subjected to pre-forging heat treatment at a temperature of 1200-1280℃. During the thick plate rolling process, the initial rolling temperature is 1100~1200℃, and the final rolling temperature is ≥950℃; In the thick plate rolling process, the deformation amount of the first pass is 3-5%, the deformation amount of the second and third passes is 15-25%, the deformation amount of the intermediate passes is 10-15%, and the deformation amount of the last pass is 15-20%.

2. The method for preparing high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel plate according to claim 1, characterized in that, In step S1: The electrode weighs more than 15 tons; and / or The electroslag ingot is a round ingot with a diameter of 900-1000 mm and a weight of ≥10 tons.

3. The method for preparing high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel plate according to claim 1, characterized in that, In step S2, during the homogenization annealing process, the annealing temperature is 1220~1280℃ and the annealing time is ≥48h.

4. The method for preparing high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel plate according to claim 1, characterized in that, In step S2, the forging blank is prepared by upsetting and drawing.

5. The method for preparing high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel plate according to claim 1, characterized in that, In S3, the thickness of the high-temperature and corrosion-resistant nickel-based alloy hot-rolled steel plate is 10-70 mm, and the single weight is ≥7 tons.

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