A GH4350 alloy and a cold-drawing preparation process thereof

Abstract

The present application relates to the field of alloy material, and specifically discloses a GH4350 alloy and a cold-drawing preparation process thereof.The present application uses the processes of consumable remelting, annealing heat treatment, forging, rolling and cold-drawing to treat the poured steel, successfully solves the problem of chemical composition segregation of the GH4350 alloy in the prior art, and obtains the GH4350 alloy with stable chemical elements, and the high-temperature tensile yield strength of the alloy is increased by more than 1000MPa.The cold-drawing preparation process of the GH4350 alloy provided by the present application effectively solves the problem of unstable alloy elements in the process of preparing the GH4350 alloy in the prior art, which causes certain defects to the alloy performance, and provides a new idea for the development and utilization of the GH4350 alloy.

Description

Technical Field

[0001] This invention relates to the field of alloy materials, and specifically discloses a GH4350 alloy and its cold-drawing preparation process. Background Technology

[0002] AEREX 350 (domestic designation GH350) alloy is a new high-temperature, high-strength, multiphase fastener alloy developed by SPS Corporation of the United States to meet the demand for high-strength, high-creep-resistance fastener alloys used in advanced aero-engines at temperatures above 700°C. Based on the MP159 alloy, it was developed through compositional optimization, achieving a maximum operating temperature of 750°C. This alloy not only retains the high corrosion resistance and excellent ductility of the MP159 alloy, but also significantly improves its endurance strength and creep resistance, making it the highest-temperature high-strength fastener alloy currently available. Due to its excellent comprehensive performance, in addition to being suitable for high-strength fasteners operating at 650-750°C, it is also an ideal material for turbine blades, turbine disks, and aircraft and aircraft landing gear.

[0003] However, the original process for preparing this alloy has the following drawbacks: 1. The alloy prepared by the original process has a high nitrogen and oxygen content, with O generally exceeding 20 ppm and N generally exceeding 70 ppm, causing certain defects in the alloy's performance; 2. The original process results in excessive burn-off of each element during melting, leading to unstable burn-off patterns; 3. The microstructure and properties of the finished product prepared using the original process are difficult to meet the required standards. Based on this, a method for preparing GH4350 alloy has been provided in the prior art, but the control range of easily fluctuating elements in the alloy is narrow, and the element content is difficult to control, resulting in the nitrogen content failing to meet the required standards in the later stages. Therefore, developing a preparation process for GH4350 alloy is of great significance to the fastener alloy field. Summary of the Invention

[0004] To address the problem of elemental instability in existing GH4350 alloy preparation processes, which leads to performance defects, this invention provides a GH4350 alloy and its cold-drawing preparation process. This invention utilizes a consumable remelting process combined with annealing heat treatment, forging, rolling, and cold drawing to successfully solve the problem of compositional segregation in the GH4350 alloy. Furthermore, by employing large deformation techniques during rolling and cold drawing, the tensile yield strength at 730℃ is successfully increased to over 1000 MPa. This invention provides a new approach for the preparation of GH43590 alloy.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution.

[0006] The first aspect of this invention provides a cold-drawing process for preparing GH4350 alloy, comprising the following steps:

[0007] Step 1: The raw materials are melted, refined, alloyed, cast, and remelted in sequence to obtain consumable ingots;

[0008] Step 2: The consumable ingot is subjected to annealing heat treatment, forging, rolling and cold drawing in sequence to obtain the GH4350 alloy;

[0009] In step one, the starting current of the self-consuming remelting process is 2.5-4.2 kA, the voltage is 22.8-23.3 V, the droplet size is 1.0-9.0 l / s, and the time is 3-20 min.

[0010] The melting rate of the smelting stage of the self-consumable remelting process is 2.5-2.7 kg / min, and the droplet density is 6-9 l / s;

[0011] The current during the heat sealing stage of the self-consumable remelting process is 1.5-3.0 kA, the melting rate is 0.5-1.8 kg / min, the voltage is 22-23 V, and the droplet size is 3-12 l / s.

[0012] The cold drawing is performed using water cooling, the solution temperature of the cold drawing is 1060-1080℃, and the drawing deformation is 40%-45%.

[0013] Compared to existing technologies, this invention re-processes the GH4350 alloy after casting, including arc remelting, annealing heat treatment, forging, rolling, and cold drawing. The inventors discovered that in existing technologies, the composition of the cast steel exhibits significant deviations, especially during melting, where the oxygen and nitrogen content of the fully melted gas is high, making it difficult to remove oxygen and nitrogen elements later, leading to increased compositional deviations in the ingot and affecting its performance. Therefore, this invention performs arc remelting on the cast product, homogenizing the ingot composition and ensuring uniform and controllable composition throughout, effectively solving the chemical composition segregation problem present in existing GH4350 alloys. Furthermore, this invention performs annealing heat treatment, forging, rolling, and cold drawing on the arc ingot, utilizing a large deformation of 40%-45% during cold drawing to increase the tensile yield strength of the GH4350 alloy at 730℃ by over 1000 MPa. This invention successfully prepared a GH4350 alloy with stable chemical composition, no segregation problem, and high tensile yield strength at high temperature by performing self-consumable remelting, annealing heat treatment, forging, rolling and cold drawing on the cast product.

[0014] Preferably, the specific operation of the annealing heat treatment is as follows: the self-consumable ingot is heated to 580-620℃ once and held for 1.5-3 hours; the self-consumable ingot is heated to 980-1020℃ a second time and held for 1.5-2.5 hours; the self-consumable ingot is heated to 1150-1170℃ a third time and held for 22-30 hours; finally, the self-consumable ingot is heated to 1180-1200℃ a fourth time and held for 45-55 hours to obtain the annealed self-consumable ingot.

[0015] More preferably, the annealing heat treatment is carried out by a programmed temperature rise method, wherein the heating rate of the first heating is 90-110℃ / h; the heating rate of the second heating is 35-45℃ / h; the heating rate of the third heating is 35-45℃ / h; and the heating rate of the fourth heating is 15-25℃ / h.

[0016] Preferably, the forging process involves subjecting the annealed consumable ingot to five fire forgings at a temperature of 1100-1150°C, resulting in a round billet with a diameter of 145mm-150mm.

[0017] More preferably, the forging process involves subjecting the annealed consumable ingot to five heat treatments at 1100-1150°C. The first heat treatment is a full-length drawing process, resulting in a square billet with pre-forging dimensions of 300mm×300mm-310mm×310mm and a post-forging dimension of 245mm×245mm-255mm×255mm. The second heat treatment is a head-length drawing process, resulting in a square billet with pre-forging dimensions of 245mm×245mm-255mm×255mm and a post-forging dimension of 175mm×175mm-185mm×185mm. The third heat treatment... The forging method is tail-drawing, with a pre-forging size of 245mm×245mm-255mm×255mm square billet and a post-forging size of 175mm×175mm-185mm×185mm square billet; the forging method of the fourth heat treatment is head-drawing, with a pre-forging size of 175mm×175mm-185mm×185mm square billet and a post-forging size of 145mm-155mm round billet; the forging method of the fifth heat treatment is tail-drawing, with a pre-forging size of 175mm×175mm-185mm×185mm square billet and a post-forging size of 145mm-155mm round billet.

[0018] Preferably, the specific operation of the rolling is as follows: S1, heating the forged billet to 1110-1130℃, holding it at that temperature for 100min-140min, rolling it into a square billet of 55mm×55mm-60mm×60mm using a rolling mill, cooling it to obtain the first rolled billet;

[0019] S2. Heat the first rolled billet to 1110-1130℃, hold for 40-60 minutes, and roll it into a round billet with a diameter of 18mm-22mm using a rolling mill. When the temperature is 950-1000℃, stop rolling and cool to obtain the rolled billet.

[0020] Preferably, the solution treatment time for cold drawing is 50-70 minutes.

[0021] Preferably, the materials are fed in the order of Ni, Cr, Co, Mo, Ta and Nb during melting, the melting temperature is 1490-1510℃, and the vacuum degree of melting is ≤100Pa.

[0022] Preferably, the refining temperature is 1500-1520℃, and the vacuum degree of the refining is ≤1Pa.

[0023] Preferably, the pouring temperature is 1470-1490℃.

[0024] Preferably, the GH4350 alloy, by weight percentage, comprises the following chemical composition: C ≤ 0.025%, Cr: 15.50%-18.00%, Co: 23.0%-27.0%, Mo: 2.0%-3.5%, Al: 0.70%-1.25%, Ti: 1.7%-2.35%, Ta: 3.6%-4.6%, Nb: 0.70%-1.35%, W: 1.70%-2.80%, Fe ≤ 0.10%, B ≤ 0.03%, Si ≤ 0.20%, Mn ≤ 0.20%, S ≤ 0.01%, P ≤ 0.02%, Zr ≤ 0.5%, O ≤ 10ppm, N ≤ 20ppm, with the balance being Ni and unavoidable impurities.

[0025] The second aspect of the present invention provides a GH4350 alloy, which is prepared by the cold drawing process of the GH4350 alloy.

[0026] In summary, this invention provides a cold-drawing process for preparing GH4350 alloy. By utilizing consumable remelting, annealing heat treatment, forging, rolling, and cold drawing processes to treat the cast product, it successfully solves the problem of chemical composition segregation in existing GH4350 alloys, resulting in a GH4350 alloy with stable chemical elements. The high-temperature tensile yield strength of this alloy is increased by over 1000 MPa. The cold-drawing process for preparing GH4350 alloy provided by this invention effectively solves the problem of unstable elements in the alloy, which causes certain defects in alloy properties, in existing GH4350 alloy preparation processes. This provides a new approach for the development and utilization of GH4350 alloy. Detailed Implementation

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0028] Example 1

[0029] This embodiment provides a cold-drawing process for GH4350 alloy, which specifically includes the following steps:

[0030] The GH4350 alloy, by weight percentage, comprises the following chemical composition: C: 0.021%, Cr: 16.30%, Co: 24.10%, Mo: 3.20%, Al: 1.11%, Ti: 2.21%, Ta: 4.10%, Nb: 1.09%, W: 2.04%, Fe: 0.02%, B: 0.007%, Si: 0.08%, Mn: 0.05%, S: 0.001%, P: 0.004%, Zr: 0.004%, O: 9ppm, N: 15ppm, with the balance being Ni and unavoidable impurities.

[0031] Step 1: Weigh the raw materials according to the component ratio, and add the raw materials in the order of Ni, Cr, Co, Mo, Ta and Nb in sequence. Melt the raw materials at a temperature of 1500℃ and control the vacuum degree during the melting period at 80-90Pa. After the melting is completed, molten steel is obtained.

[0032] Step 2: Refine the molten steel at a temperature of 1510℃, controlling the vacuum level during refining to 0.5-0.7 Pa. After refining, a refined molten steel is obtained. Samples are taken for testing to analyze the chemical composition, ensuring that the results of each chemical element are within the standard requirements, thus obtaining an alloyed molten steel. The alloyed molten steel is then poured through a casting trough at a temperature of 1480℃ to obtain the finished casting.

[0033] Step 3: Perform consumable remelting on the cast product according to the following consumable remelting parameters to obtain consumable ingots.

[0034] 1. Start-up Phase

[0035] 1 3 2.5 22.8 1.0 2 3 3.4 22.9 1.0 3 8 5.1 23.6 1.0 4 15 5.1 23.5 7.0 5 18 4.4 23.4 9.0 6 20 4.2 23.3 9.0

[0036] 2. Smelting stage

[0037]

[0038] 3. Hot capping stage

[0039]

[0040] Step 4: Heat the consumable ingot to 600℃ at a heating rate of 100℃ / h and hold for 2 hours. Then heat the consumable ingot to 1000℃ at a heating rate of 40℃ / h and hold for 2 hours. Next, heat the consumable ingot to 1160℃ at a heating rate of 40℃ / h and hold for 25 hours. Finally, heat the consumable ingot to 1190℃ at a heating rate of 15℃ / h and hold for 50 hours to obtain the annealed consumable ingot.

[0041] Step 5: The annealed consumable ingot is subjected to five-stage forging at 1130℃. The first stage of forging involves continuous length drawing, resulting in a 305mm×305mm square billet before forging and a 250mm×250mm square billet after forging. The second stage involves head drawing, resulting in a 250mm×250mm square billet before forging and a 180mm×180mm square billet after forging. The third stage of forging... The first type of forging involves drawing the tail, resulting in a square billet with dimensions of 250mm×250mm before forging and 180mm×180mm after forging. The second type involves drawing the head, resulting in a square billet with dimensions of 180mm×180mm before forging and 150mm in diameter after forging. The third type involves drawing the tail, resulting in a square billet with dimensions of 180mm×180mm before forging and 150mm in diameter after forging.

[0042] Step 6: Heat the forged billet to 1120℃, hold for 120 minutes, and roll it into a 55mm×55mm square billet using a 450 rolling mill. Air cool to obtain the first rolled billet. Then heat the first rolled billet to 1120℃, hold for 50 minutes, and roll it into a 20mm diameter round billet using a 450 rolling mill. When the temperature reaches 960℃, stop rolling and air cool to obtain the rolled billet.

[0043] Step 7: The rolled billet is cold-drawn by water cooling at a solution temperature of 1070℃ for 60 minutes. The cold-drawn deformation is 43%, thus obtaining the GH4350 alloy.

[0044] Example 2

[0045] This embodiment provides a cold-drawing process for GH4350 alloy, which specifically includes the following steps:

[0046] The GH4350 alloy, by weight percentage, comprises the following chemical composition: C: 0.020%, Cr: 16.35%, Co: 24.09%, Mo: 3.19%, Al: 1.12%, Ti: 2.20%, Ta: 4.09%, Nb: 1.10%, W: 2.02%, Fe: 0.02%, B: 0.0068%, Si: 0.08%, Mn: 0.05%, S: 0.001%, P: 0.005%, Zr: 0.004%, O: 9ppm, N: 17ppm, with the balance being Ni and unavoidable impurities.

[0047] Step 1: Weigh the raw materials according to the component ratio, and add the raw materials in the order of Ni, Cr, Co, Mo, Ta and Nb in sequence. Melt the raw materials at a temperature of 1510℃ and control the vacuum degree during the melting period to 80-90Pa. After melting is completed, molten steel is obtained.

[0048] Step 2: Refine the molten steel at a temperature of 1500℃, controlling the vacuum level during refining to 0.6-0.8 Pa. After refining, refined steel is obtained. Samples are taken for testing to analyze the chemical composition, ensuring that the results of each chemical element are within the standard requirements, thus obtaining alloyed steel. The alloyed steel is then poured through a casting trough at a temperature of 1490℃ to obtain the finished casting.

[0049] Step 3: Perform consumable remelting on the cast product according to the following consumable remelting parameters to obtain consumable ingots.

[0050] 1. Start-up Phase

[0051]

[0052]

[0053] 2. Smelting stage

[0054]

[0055] 3. Hot capping stage

[0056]

[0057] Step 4: Heat the consumable ingot to 620°C at a heating rate of 100°C / h and hold for 1.5h. Then heat the consumable ingot to 1020°C at a heating rate of 40°C / h and hold for 1.5h. Then heat the consumable ingot to 1160°C at a heating rate of 40°C / h and hold for 22h. Finally, heat the consumable ingot to 1180°C at a heating rate of 20°C / h and hold for 55h to obtain the annealed consumable ingot.

[0058] Step 5: The annealed consumable ingot is subjected to five-stage forging at 1140℃. The first stage of forging involves continuous length drawing, resulting in a 300mm×300mm square billet before forging and a 245mm×245mm square billet after forging. The second stage involves head drawing, resulting in a 245mm×245mm square billet before forging and a 175mm×175mm square billet after forging. The third stage of forging... The first type of forging involves drawing the tail, resulting in a square billet with dimensions of 245mm×245mm before forging and 175mm×175mm after forging. The second type involves drawing the head, resulting in a square billet with dimensions of 175mm×175mm before forging and 145mm in diameter after forging. The third type involves drawing the tail, resulting in a square billet with dimensions of 175mm×175mm before forging and 145mm in diameter after forging.

[0059] Step 6: Heat the forged billet to 1110℃, hold for 140 minutes, and roll it into a 60mm×60mm square billet using a 450 rolling mill. Air cool to obtain the first rolled billet. Then heat the first rolled billet to 1130℃, hold for 40 minutes, and roll it into a 18mm diameter round billet using a 450 rolling mill. When the temperature reaches 1000℃, stop rolling and air cool to obtain the rolled billet.

[0060] Step 7: The rolled billet is cold-drawn by water cooling at a solution temperature of 1080℃ for 50 minutes. The cold-drawn deformation is 44%, thus obtaining the GH4350 alloy.

[0061] Example 3

[0062] This embodiment provides a cold-drawing process for GH4350 alloy, which specifically includes the following steps:

[0063] The GH4350 alloy, by weight percentage, comprises the following chemical composition: C: 0.020%, Cr: 16.33%, Co: 24.12%, Mo: 3.19%, Al: 1.12%, Ti: 2.22%, Ta: 4.11%, Nb: 1.12%, W: 2.03%, Fe: 0.02%, B: 0.007%, Si: 0.07%, Mn: 0.05%, S: 0.001%, P: 0.004%, Zr: 0.0041%, O: 7ppm, N: 16ppm, with the balance being Ni and unavoidable impurities.

[0064] Step 1: Weigh the raw materials according to the component ratio, and add them in the order of Ni, Cr, Co, Mo, Ta and Nb. Melt the raw materials at a temperature of 1500℃ and control the vacuum degree during the melting period at 80-90Pa. After melting is completed, molten steel is obtained.

[0065] Step 2: Refine the molten steel at a temperature of 1500℃, controlling the vacuum level during refining to 0.5-0.9 Pa. After refining, refined steel is obtained. Samples are taken for testing to analyze the chemical composition, ensuring that the results of each chemical element are within the standard requirements, thus obtaining alloyed steel. The alloyed steel is then poured through a casting trough at a temperature of 1470℃ to obtain the finished casting.

[0066] Step 3: Perform consumable remelting on the cast product according to the following consumable remelting parameters to obtain consumable ingots.

[0067] 1. Start-up Phase

[0068] 1 3 2.5 22.8 1.0 2 3 3.4 22.9 1.0 3 8 5.1 23.6 1.0 4 15 5.1 23.5 7.0 5 18 4.4 23.4 9.0 6 20 4.2 23.3 9.0

[0069] 2. Smelting stage

[0070]

[0071] 3. Hot capping stage

[0072]

[0073]

[0074] Step 4: Heat the consumable ingot to 600℃ at a heating rate of 100℃ / h and hold for 2 hours. Then heat the consumable ingot to 1000℃ at a heating rate of 40℃ / h and hold for 2 hours. Next, heat the consumable ingot to 1160℃ at a heating rate of 40℃ / h and hold for 25 hours. Finally, heat the consumable ingot to 1190℃ at a heating rate of 15℃ / h and hold for 50 hours to obtain the annealed consumable ingot.

[0075] Step 5: The annealed consumable ingot is subjected to five-stage forging at a temperature of 1100-1150℃. The first stage of forging involves continuous length drawing, resulting in a 310mm×310mm square billet before forging and a 255mm×255mm square billet after forging. The second stage involves head drawing, resulting in a 255mm×255mm square billet before forging and a 185mm×185mm square billet after forging. The third stage of forging... The forging method of the first type is tail-drawing, with a pre-forging size of 255mm×255mm square billet and a post-forging size of 185mm×185mm square billet; the forging method of the fourth type is head-drawing, with a pre-forging size of 185mm×185mm square billet and a post-forging size of 155mm diameter round billet; the forging method of the fifth type is tail-drawing, with a pre-forging size of 185mm×185mm square billet and a post-forging size of 155mm diameter round billet.

[0076] Step 6: Heat the forged billet to 1130℃, hold for 100 minutes, and roll it into a 60mm×60mm square billet using a 450 rolling mill. Air cool to obtain the first rolled billet. Then heat the first rolled billet to 1110℃, hold for 60 minutes, and roll it into a 22mm diameter round billet using a 450 rolling mill. When the temperature reaches 950℃, stop rolling and air cool to obtain the rolled billet.

[0077] Step 7: The rolled billet is cold-drawn by water cooling at a solution temperature of 1070℃ for 70 minutes. The cold-drawn deformation is 45%, thus obtaining the GH4350 alloy.

[0078] Comparative Example 1

[0079] This comparative example provides a GH4350 alloy that, compared to Example 1, does not involve consumable remelting, annealing heat treatment, forging, rolling, and cold drawing processes. Other components and processes remain unchanged and will not be described in detail here.

[0080] Comparative Example 2

[0081] This comparative example provides a GH4350 alloy, which, compared to Example 1, does not have a self-consumable remelting process, and the other components and processes remain unchanged, which will not be described in detail here.

[0082] Comparative Example 3

[0083] This comparative example provides a GH4350 alloy, which, compared to Example 1, does not involve a cold drawing process, while other components and processes remain unchanged, and will not be described in detail here.

[0084] To further demonstrate the technical effects of the present invention, the GH4350 alloys obtained in Examples 1-3 and Comparative Examples 1-3 were subjected to the following performance tests: specifically, high-temperature tensile strength test at 730°C (referring to the standard GB / T4994 for cold-drawn bars of GH4350 alloy for high-temperature and high-strength fasteners), high-temperature yield strength test at 730°C (referring to the standard GB / T4338), and high-temperature tensile property test (referring to the standard GB / T4338). The specific test results are shown in Table 1.

[0085] Table 1. Performance test results of GH4350 alloy obtained from each embodiment and comparative example.

[0086]

[0087]

[0088] As can be seen from Table 1, the GH4350 alloy provided by the present invention has superior performance, especially the GH4350 alloy provided in the example, which has a high-temperature tensile strength of up to 1268 MPa, a high-temperature yield strength of up to 1045 MPa, an elongation of 7%, and a reduction of area of ​​12.5%.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cold-drawing process for preparing GH4350 alloy, characterized in that: The steps include the following: Step 1: The raw materials are melted, refined, alloyed, cast, and remelted in sequence to obtain consumable ingots; Step 2: The consumable ingot is subjected to annealing heat treatment, forging, rolling and cold drawing in sequence to obtain the GH4350 alloy; In step one, the starting current of the self-consumable remelting process is 2.5-4.2 kA, the voltage is 22.8-23.3 V, the droplet size is 1.0-9.0 l / s, and the time is 3-20 min. The melting rate of the smelting stage of the self-consumable remelting process is 2.5-2.7 kg / min, and the droplet density is 6-9 l / s; The current for the heat sealing stage of the self-consumable remelting is 1.5-3.0KA, the melting rate is 0.5-1.8kg / min, the voltage is 22-23V, and the droplet size is 3-12l / s; In step two, the specific operation of the annealing heat treatment is as follows: the consumable ingot is heated to 580-620℃ once and held for 1.5-3 hours at a heating rate of 90-110℃ / h; the consumable ingot is then heated to 980-1020℃ a second time and held for 1.5-2.5 hours at a heating rate of 35-45℃ / h; the consumable ingot is then heated to 1150-1170℃ a third time and held for 22-30 hours at a heating rate of 35-45℃ / h; finally, the consumable ingot is heated to 1180-1200℃ a fourth time and held for 45-55 hours at a heating rate of 15-25℃ / h to obtain the annealed consumable ingot. The specific forging operation is as follows: the annealed consumable ingot is subjected to five fire forgings at a temperature of 1100-1150℃, and a round billet with a diameter of 145mm-150mm is obtained after forging. The cold drawing is performed using water cooling, the solution temperature of the cold drawing is 1060-1080℃, and the drawing deformation is 40%-45%.

2. The cold drawing process for GH4350 alloy as described in claim 1, characterized in that: The specific rolling operation is as follows: S1, heat the forged billet to 1110-1130℃, hold it for 100min-140min, roll it into a square billet of 55mm×55mm-60mm×60mm using a rolling mill, cool it, and obtain the first rolled billet; S2. Heat the first rolled billet to 1110-1130℃, hold for 40-60 minutes, and roll it into a round billet with a diameter of 18mm-22mm using a rolling mill. When the temperature is 950-1000℃, stop rolling and cool to obtain the rolled billet.

3. The cold drawing process for GH4350 alloy as described in claim 1, characterized in that: The solution treatment time for cold drawing is 50-70 minutes.

4. The cold drawing process for GH4350 alloy as described in claim 1, characterized in that: During the melting process, the materials are added in the order of Ni, Cr, Co, Mo, Ta and Nb. The melting temperature is 1490-1510℃, and the vacuum degree of the melting process is ≤100Pa.

5. The cold drawing process for GH4350 alloy as described in claim 1, characterized in that: The refining temperature is 1500-1520℃, and the vacuum degree of the refining is ≤1Pa; and / or The pouring temperature is 1470-1490℃.

6. The cold drawing process for GH4350 alloy as described in claim 1, characterized in that: The GH4350 alloy, by weight percentage, comprises the following chemical composition: C≤0.025%, Cr:15.50%-18.00%, Co:23.0%-27.0%, Mo:2.0%-3.5%, Al:0.70%-1.25%, Ti:1.7%-2.35%, Ta:3.6%-4.6%, Nb:0.70%-1.35%, W:1.70%-2.80%, Fe≤0.10%, B≤0.03%, Si≤0.20%, Mn≤0.20%, S≤0.01%, P≤0.02%, Zr≤0.5%, O≤10ppm, N≤20ppm, with the balance being Ni and unavoidable impurities.

7. A GH4350 alloy, characterized in that: It is prepared using the cold drawing process of GH4350 alloy as described in any one of claims 1-6.

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