Stainless steel bearing for rotor spinning machine

Abstract

The invention relates to the technical field of stainless steel, and provides a stainless steel bearing for a rotor spinning machine, which comprises the following bearing materials in percentage by mass: 0.19 to 0.23 percent of C, 0.25 to 0.35 percent of Si, 0.25 to 0.45 percent of Mn, 0.6 to 0.8 percent of Cr, 1.4 to 1.6 percent of Ni, 0.2 to 0.3 percent of Mo, 0.015 to 0.05 percent of Al, 0.008 to 0.15 percent of Cu, 0.005 to 0.015 percent of Ce, 0.008 to 0.012 percent of N, less than or equal to 0.01 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.0006 percent of Ca, less than or equal to 0.0015 percent of Ti, less than or equal to 0.002 percent of O, 0.0024 to 0.0075 percent of La, 0.0008 to 0.004 percent of Ce, 0.0015 to 0.0088 percent of Nd and the balance of The mass contents of La, Ce and Nd meet the relational expression: 5La + 2Ce + 3Nd = 0.01%-0.08%. According to the technical scheme, the problem that a stainless steel bearing in the prior art is insufficient in strength and toughness is solved.

Description

Technical Field

[0001] This invention relates to the field of stainless steel technology, specifically to a stainless steel bearing for rotor spinning machines. Background Technology

[0002] Rotor spinning machines, as core equipment for achieving efficient and large-scale production in the textile industry, are widely used in the spinning of various fibers such as cotton, linen, and chemical fibers. The high-speed and stable rotation of the rotor directly determines the spinning efficiency and yarn quality. Stainless steel bearings, as the core supporting component for rotor rotation, are key fundamental elements ensuring the continuous operation of the entire machine. With the textile industry's increasing demands for production efficiency and product quality, higher requirements are being placed on the performance of stainless steel bearings.

[0003] However, existing stainless steel bearings for rotor spinning machines still have significant performance shortcomings. For example, increasing strength often sacrifices toughness. This is because improving strength often relies on increasing carbide content, refining the microstructure, or strengthening solid solution, which hinders plastic deformation, exacerbates stress concentration, and leads to easy cracking and fracture under high-speed impact. Conversely, improving toughness usually weakens strength. This is because improving toughness requires reducing carbon content, reducing hard carbides, or increasing tempering temperature, which weakens the matrix strength of the stainless steel bearing material. As a result, under high speed and high load, the contact surface of the bearing experiences plastic rheology and rapid wear due to insufficient strength reserve. Therefore, there is an urgent need to develop a stainless steel bearing for rotor spinning machines that can balance excellent strength and toughness to meet the high-speed and stable production requirements of rotor spinning machines. Summary of the Invention

[0004] This invention proposes a stainless steel bearing for rotor spinning machines, which solves the problem of insufficient strength and toughness of stainless steel bearings in related technologies.

[0005] The technical solution of the present invention is as follows: This invention proposes a stainless steel bearing material for rotor spinning machines, wherein the stainless steel bearing material is composed of the following components by mass percentage: C 0.19%~0.23%, Si 0.25%~0.35%, Mn 0.25%~0.45%, Cr 0.6%~0.8%, Ni 1.4%~1.6%, Mo 0.2%~0.3%, Al 0.015%~0.05%, Cu 0.008%~0.15%, Ce 0.005%~0.015%, N 0.008%~0.012%, P≤0.01%, S≤0.005%, Ca≤0.0006%, Ti≤0.0015%, O≤0.002%, La 0.0024%~0.0075%, Ce 0.0008%~0.004%, Nd The content of La, Ce, and Nd is 0.0015%~0.0088%, with the balance being Fe and unavoidable impurities; the mass content of La, Ce, and Nd satisfies the relationship: 5La+2Ce+3Nd=0.01%~0.08%.

[0006] As a further technical solution, the mass content of La, Ce, and Nd satisfies the relationship: 5La + 2Ce + 3Nd = 0.04%~0.048%.

[0007] As a further technical solution, the mass content of La, Ce, and Nd satisfies the relationship: 5La + 2Ce + 3Nd = 0.044%.

[0008] As a further technical solution, the mass content of La and Ce satisfies the relationship: 1≤La / Ce≤3.

[0009] As a further technical solution, the mass content of La and Ce satisfies the relationship: La / Ce=2.5.

[0010] This invention also proposes a method for preparing a stainless steel bearing material for a rotor spinning machine, the method comprising the following steps: S1. After the converter steel is refined by LF to obtain the target composition, it is degassed under vacuum and continuously cast to obtain the billet; S2. The bearing material is obtained by peeling, electroslag remelting, forging, annealing, heating and rolling, and cooling of the cast billet.

[0011] As a further technical solution, in step S1, the continuous casting process is carried out under argon protection, and the argon pressure is 0.1~0.3MPa.

[0012] As a further technical solution, in step S2, the electroslag remelting includes the following steps: after the peeled billet is made into an electrode, it is subjected to electroslag remelting, and the melting rate of the electroslag is 8~13 kg / min.

[0013] As a further technical solution, in step S2, the forging heating temperature of the forging billet is 1200~1400℃, and the final forging temperature of the forging billet is 800~900℃.

[0014] As a further technical solution, in step S2, the annealing is performed by heating, holding at a certain temperature, and cooling in sequence; The heating is performed by heating to 820~880℃ and holding at that temperature, with a holding coefficient of 1.2~1.5 min / mm; the cooling consists of a first cooling stage and a second cooling stage, with different cooling rates for the first cooling stage and the second cooling stage.

[0015] As a further technical solution, the first stage of cooling is to cool down to 680°C at a rate of 3~4°C / min; the second stage of cooling is to cool down to 500°C at a rate of 1~2°C / min. In the annealing process of this invention, the cooling process involves two stages: first, cooling to 680°C at a rate of 3-4°C / min; then cooling to 500°C at a rate of 1-2°C / min. This improves the toughness of the stainless steel bearing. The first stage of cooling, with a relatively fast cooling rate of 3-4°C / min from the annealing temperature to 680°C, effectively suppresses the formation of brittle phases, resulting in a finer and more uniform initial microstructure, laying the foundation for good toughness. Subsequently, a second stage of cooling at a rate of 1-2°C / min is used to effectively reduce the internal stress concentration caused by rapid cooling, while creating favorable conditions for the smooth transformation of austenite to ferrite and the uniform and spheroidized precipitation of carbides. Ultimately, this optimizes the carbide morphology, fully releases the microstructure stress, effectively avoids increased brittleness due to excessive internal stress, and improves the tensile strength and elongation after fracture of the stainless steel bearing material.

[0016] As a further technical solution, the heated rolling process involves sequentially performing heat treatment, rough rolling, and finish rolling.

[0017] As a further technical solution, the heat treatment consists of a preheating section, a heating section, and a soaking section in sequence; The temperature of the preheating section is 500~800℃, and the preheating time is 1~1.5h; The temperature of the heating section is 800~1200℃, and the heating time is 1.5~2h; The temperature of the heat exchange zone is 1200~1250℃, and the heat exchange period is 2~2.5h.

[0018] As a further technical solution, the initial rolling temperature of the roughing process is 1100℃, the final rolling temperature is 1050℃, and the total reduction rate is 60%.

[0019] As a further technical solution, the initial rolling temperature of the finishing rolling process is 950℃, the final rolling temperature is 820℃, and the total reduction rate is 40%.

[0020] The present invention also proposes a stainless steel bearing for a rotor spinning machine, which is prepared from the stainless steel bearing material or the method for preparing the stainless steel bearing material.

[0021] The working principle and beneficial effects of this invention are as follows: This invention achieves a synergistic improvement in the strength and toughness of stainless steel bearing materials by limiting the mass content of La, Ce, and Nd to satisfy the relationship: 5La + 2Ce + 3Nd = 0.01%~0.08%, thereby increasing tensile strength and elongation after fracture. La primarily plays a role in deeply purifying the molten steel, forming stable high-melting-point compounds with elements such as oxygen and sulfur, refining grains, and thus improving the purity and density of the material. Ce effectively alters the morphology and distribution of inclusions, transforming brittle inclusions into dispersed spherical or fine-ribbed plastic inclusions, reducing stress concentration sources, and significantly improving the fatigue strength and toughness of the material. The addition of Nd further strengthens grain boundaries, suppresses grain coarsening during high-temperature processing, and helps obtain a more uniform and fine microstructure, improving the overall mechanical properties of the material. These three elements work synergistically, optimizing carbide distribution and ensuring hardness while improving the elongation after fracture and tensile strength, providing a reliable guarantee for the efficient and stable operation of spinning equipment. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0023] Example 1 A stainless steel bearing for a rotor spinning machine is made from the following bearing material using conventional methods; A stainless steel bearing material for rotor spinning machines comprises the following components by mass percentage: C 0.19%, Si 0.25%, Mn 0.25%, Cr 0.6%, Ni 1.4%, Mo 0.2%, Al 0.015%, Cu 0.008%, Ce 0.005%, N 0.008%, P 0.005%, S 0.002%, Ca 0.0003%, Ti 0.001%, O 0.001%, La 0.004%, Ce 0.004%, Nd 0.004%, with the balance being Fe and unavoidable impurities; the value of 5La+2Ce+3Nd is 0.04%, and the La / Ce ratio is 1. A method for preparing a stainless steel bearing material for a rotor spinning machine includes the following steps: S1. After the converter steel is refined by LF to obtain the target composition, it is degassed under vacuum and then continuously cast under argon protection at 0.1MPa to obtain the billet. S2. The billet is peeled, electroslag remelted at a melting rate of 8 kg / min, and forged (the forging heating temperature of the forging billet is 1200℃, and the final forging temperature of the forging billet is 800℃). After heating to 820℃, it is held for 1.5 min / mm, cooled to 680℃ at a first cooling rate of 3℃ / min, and then cooled to 500℃ at a second cooling rate of 1℃ / min. After heat treatment, rough rolling (the initial rolling temperature of the rough rolling treatment is 1100℃, the final rolling temperature is 1050℃, and the total reduction rate is 60%), and finish rolling (the initial rolling temperature of the finish rolling treatment is 950℃, the final rolling temperature is 820℃, and the total reduction rate is 40%), it is cooled to room temperature at a rate of 20℃ / s to obtain the bearing material. The heat treatment consists of a preheating section, a heating section, and a soaking section in sequence. The temperature of the preheating section is 500℃ and the preheating time is 1 hour. The temperature of the heating section is 800℃ and the heating time is 1.5 hours. The temperature of the soaking section is 1200℃ and the soaking time is 2 hours.

[0024] Example 2 A stainless steel bearing for a rotor spinning machine is made from the following bearing material using conventional methods; A stainless steel bearing material for rotor spinning machines comprises the following components by mass percentage: C 0.2%, Si 0.3%, Mn 0.35%, Cr 0.7%, Ni 1.5%, Mo 0.25%, Al 0.03%, Cu 0.12%, Ce 0.01%, N 0.01%, P 0.007%, S 0.003%, Ca 0.0005%, Ti 0.0013%, O 0.001%, La 0.004%, Ce 0.004%, Nd 0.004%, with the balance being Fe and unavoidable impurities; the value of 5La+2Ce+3Nd is 0.04%, and the La / Ce ratio is 1. A method for preparing a stainless steel bearing material for a rotor spinning machine includes the following steps: S1. After the converter steel is refined by LF to obtain the target composition, it is degassed under vacuum and then continuously cast under argon protection at 0.2MPa to obtain the billet. S2. The billet is peeled, electroslag remelted at a melting rate of 11 kg / min, and forged into a billet (the forging heating temperature of the forging billet is 1300℃, and the final forging temperature of the forging billet is 850℃). After heating to 850℃, it is held at 1.3 min / mm, cooled to 680℃ at a first cooling rate of 3℃ / min, and then cooled to 500℃ at a second cooling rate of 1℃ / min. After heat treatment, rough rolling (the initial rolling temperature of the rough rolling treatment is 1100℃, the final rolling temperature is 1050℃, and the total reduction rate is 60%), and finish rolling (the initial rolling temperature of the finish rolling treatment is 950℃, the final rolling temperature is 820℃, and the total reduction rate is 40%), it is cooled to room temperature at a rate of 25℃ / s to obtain the bearing material. The heat treatment consists of a preheating section, a heating section, and a soaking section in sequence. The temperature of the preheating section is 700℃ and the preheating time is 1 hour. The temperature of the heating section is 1000℃ and the heating time is 1.5 hours. The temperature of the soaking section is 1250℃ and the soaking time is 2.5 hours.

[0025] Example 3 A stainless steel bearing for a rotor spinning machine is made from the following bearing material using conventional methods; A stainless steel bearing material for rotor spinning machines comprises the following components by mass percentage: C 0.23%, Si 0.35%, Mn 0.45%, Cr 0.8%, Ni 1.6%, Mo 0.3%, Al 0.05%, Cu 0.15%, Ce 0.015%, N 0.012%, P 0.01%, S 0.005%, Ca 0.0006%, Ti 0.0015%, O 0.002%, La 0.004%, Ce 0.004%, Nd 0.004%, with the balance being Fe and unavoidable impurities; the value of 5La+2Ce+3Nd is 0.04%, and the La / Ce ratio is 1. A method for preparing a stainless steel bearing material for a rotor spinning machine includes the following steps: S1. After the converter steel is refined by LF to obtain the target composition, it is degassed under vacuum and then continuously cast under argon protection at 0.3MPa to obtain the billet. S2. The billet is peeled, electroslag remelted at a melting rate of 13 kg / min, and forged into a billet (the forging heating temperature of the forging billet is 1400℃, and the final forging temperature of the forging billet is 900℃). After heating to 880℃, it is held for 1.2 min / mm, cooled to 680℃ at a first cooling rate of 3℃ / min, and then cooled to 500℃ at a second cooling rate of 1℃ / min. After heat treatment, rough rolling (the initial rolling temperature of the rough rolling treatment is 1100℃, the final rolling temperature is 1050℃, and the total reduction rate is 60%), and finish rolling (the initial rolling temperature of the finish rolling treatment is 950℃, the final rolling temperature is 820℃, and the total reduction rate is 40%), it is cooled to room temperature at a rate of 30℃ / s to obtain the bearing material. The heat treatment consists of a preheating section, a heating section, and a soaking section in sequence. The temperature of the preheating section is 800℃ and the preheating time is 1.5h. The temperature of the heating section is 1200℃ and the heating time is 2h. The temperature of the soaking section is 1250℃ and the soaking time is 2h.

[0026] Example 4 The difference between this embodiment and Embodiment 2 lies only in that the stainless steel bearing material for the rotor spinning machine is composed of the following components by mass percentage: C 0.2%, Si 0.3%, Mn 0.35%, Cr 0.7%, Ni 1.5%, Mo 0.25%, Al 0.03%, Cu 0.12%, Ce 0.01%, N 0.01%, P 0.007%, S 0.003%, Ca 0.0005%, Ti 0.0013%, O 0.001%, La 0.0025%, Ce 0.001%, Nd 0.0085%, with the balance being Fe and unavoidable impurities; the value of 5La+2Ce+3Nd is 0.04%, and the value of La / Ce is 2.5.

[0027] Example 5 The difference between this embodiment and Embodiment 2 lies only in that the stainless steel bearing material for the rotor spinning machine is composed of the following components by mass percentage: C 0.2%, Si 0.3%, Mn 0.35%, Cr 0.7%, Ni 1.5%, Mo 0.25%, Al 0.03%, Cu 0.12%, Ce 0.01%, N 0.01%, P 0.007%, S 0.003%, Ca 0.0005%, Ti 0.0013%, O 0.001%, La 0.0024%, Ce 0.0008%, Nd 0.0088%, with the balance being Fe and unavoidable impurities; the value of 5La+2Ce+3Nd is 0.04%, and the value of La / Ce is 3.

[0028] Example 6 The difference between this embodiment and Embodiment 2 lies only in that the stainless steel bearing material for the rotor spinning machine is composed of the following components by mass percentage: C 0.2%, Si 0.3%, Mn 0.35%, Cr 0.7%, Ni 1.5%, Mo 0.25%, Al 0.03%, Cu 0.12%, Ce 0.01%, N 0.01%, P 0.007%, S 0.003%, Ca 0.0005%, Ti 0.0013%, O 0.001%, La 0.005%, Ce 0.002%, Nd 0.005%, with the balance being Fe and unavoidable impurities; the value of 5La+2Ce+3Nd is 0.044%, and the La / Ce ratio is 2.5.

[0029] Example 7 The difference between this embodiment and Embodiment 2 lies only in that the stainless steel bearing material for the rotor spinning machine is composed of the following components by mass percentage: C 0.2%, Si 0.3%, Mn 0.35%, Cr 0.7%, Ni 1.5%, Mo 0.25%, Al 0.03%, Cu 0.12%, Ce 0.01%, N 0.01%, P 0.007%, S 0.003%, Ca 0.0005%, Ti 0.0013%, O 0.001%, La 0.0075%, Ce 0.003%, Nd 0.0015%, with the balance being Fe and unavoidable impurities; the value of 5La+2Ce+3Nd is 0.048%, and the La / Ce ratio is 2.5.

[0030] Example 8 The only difference between this embodiment and embodiment 2 is that in this embodiment, step S2 is changed from cooling to 680°C at a first cooling rate of 3°C / min and then cooling to 500°C at a second cooling rate of 1°C / min to cooling to 680°C at a first cooling rate of 3°C / min and then cooling to 500°C at a second cooling rate of 1.5°C / min.

[0031] Example 9 The only difference between this embodiment and embodiment 2 is that in this embodiment, step S2 is changed from cooling to 680°C at a first cooling rate of 3°C / min and then cooling to 500°C at a second cooling rate of 1°C / min to cooling to 680°C at a first cooling rate of 3°C / min and then cooling to 500°C at a second cooling rate of 2°C / min.

[0032] Example 10 The only difference between this embodiment and embodiment 2 is that in this embodiment, step S2, which involves cooling to 680°C at a first cooling rate of 3°C / min and then cooling to 500°C at a second cooling rate of 1°C / min, is replaced with cooling to 680°C at a first cooling rate of 3.5°C / min and then cooling to 500°C at a second cooling rate of 1.5°C / min.

[0033] Example 11 The only difference between this embodiment and embodiment 2 is that in this embodiment, step S2 is changed from cooling to 680°C at a first cooling rate of 3°C / min and then cooling to 500°C at a second cooling rate of 1°C / min to cooling to 680°C at a first cooling rate of 4°C / min and then cooling to 500°C at a second cooling rate of 1.6°C / min.

[0034] Example 12 The only difference between this embodiment and embodiment 2 is that in this embodiment, step S2 is changed from cooling to 680°C at a first cooling rate of 3°C / min and then cooling to 500°C at a second cooling rate of 1°C / min to cooling to 680°C at a first cooling rate of 1°C / min and then cooling to 500°C at a second cooling rate of 3°C / min.

[0035] Example 13 The only difference between this embodiment and embodiment 2 is that in this embodiment, step S2 is changed from cooling to 680°C at a first cooling rate of 3°C / min and then cooling to 500°C at a second cooling rate of 1°C / min to cooling to 500°C at a cooling rate of 3°C / min.

[0036] Comparative Example 1 The only difference between this comparative example and Example 2 is that the stainless steel bearing material for the rotor spinning machine is composed of the following components by mass percentage: C 0.2%, Si 0.3%, Mn 0.35%, Cr 0.7%, Ni 1.5%, Mo 0.25%, Al 0.03%, Cu 0.12%, Ce 0.01%, N 0.01%, P 0.007%, S 0.003%, Ca 0.0005%, Ti 0.0013%, O 0.001%, Ce 0.004%, Nd 0.004%, with the balance being Fe and unavoidable impurities; the value of 5La+2Ce+3Nd is 0.04%, and the value of La / Ce is 1.

[0037] Comparative Example 2 The only difference between this comparative example and Example 2 is that the stainless steel bearing material for the rotor spinning machine is composed of the following components by mass percentage: C 0.2%, Si 0.3%, Mn 0.35%, Cr 0.7%, Ni 1.5%, Mo 0.25%, Al 0.03%, Cu 0.12%, Ce 0.01%, N 0.01%, P 0.007%, S 0.003%, Ca 0.0005%, Ti 0.0013%, O 0.001%, La 0.004%, Ce 0.004%, with the balance being Fe and unavoidable impurities; the value of 5La+2Ce+3Nd is 0.04%, and the value of La / Ce is 1.

[0038] Test case The stainless steel bearing materials obtained in Examples 1-13 and Comparative Examples 1-2 were tested according to the following method: 1. Tensile strength and elongation after fracture: The tensile strength and elongation after fracture of the samples shall be tested according to the test methods specified in GB / T 228.1-2021 "Metallic materials, tensile testing—Part 1: Test at room temperature". According to Method A, the test rate for elongation after fracture and tensile strength is 0.002 s. -1 The test results are shown in Tables 1 and 2 below; Table 1 Performance test results of Examples 1-7 and Comparative Examples 1-2

[0039] As shown in Table 1, the tensile strength and elongation after fracture of Examples 1-7 are higher than those of Comparative Examples 1-2, indicating that the present invention improves the tensile strength and elongation after fracture of stainless steel bearing materials for rotor spinning machines by limiting the mass content relationship of La, Ce and Nd to 5La+2Ce+3Nd=0.04%~0.048%.

[0040] Table 2 Performance test results of Examples 2 and 8-13

[0041] As shown in Table 2, the elongation after fracture of Examples 2 and 8-11 is better than that of Examples 12-13. This indicates that the present invention further improves the toughness of the stainless steel bearing material for rotor spinning machines by first cooling it to 680°C at a first cooling rate of 3-4°C / min after heat preservation, and then cooling it to 500°C at a second cooling rate of 1-2°C / min.

[0042] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. 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 stainless steel bearing material for rotor spinning machines, characterized in that, The stainless steel bearing material is composed of the following components by mass percentage: C 0.19%~0.23%, Si 0.25%~0.35%, Mn 0.25%~0.45%, Cr 0.6%~0.8%, Ni 1.4%~1.6%, Mo 0.2%~0.3%, Al 0.015%~0.05%, Cu 0.008%~0.15%, Ce 0.005%~0.015%, N 0.008%~0.012%, P≤0.01%, S≤0.005%, Ca≤0.0006%, Ti≤0.0015%, O≤0.002%, La 0.0024%~0.0075%, Ce 0.0008%~0.004%, Nd The content of La, Ce, and Nd is 0.0015%~0.0088%, with the balance being Fe and unavoidable impurities; the mass content of La, Ce, and Nd satisfies the relationship: 5La+2Ce+3Nd=0.01%~0.08%.

2. The stainless steel bearing material for rotor spinning machines according to claim 1, characterized in that, The mass contents of La and Ce satisfy the relationship: 1≤La / Ce≤3.

3. The method for preparing a stainless steel bearing material for a rotor spinning machine according to claim 1, characterized in that, Includes the following steps: S1. After the converter steel is refined by LF to obtain the target composition, it is degassed under vacuum and continuously cast to obtain the billet; S2. The bearing material is obtained by peeling, electroslag remelting, forging, annealing, heating and rolling, and cooling of the cast billet.

4. The method for preparing a stainless steel bearing material for a rotor spinning machine according to claim 3, characterized in that, In step S1, the continuous casting process is carried out under argon protection, and the argon pressure is 0.1~0.3MPa.

5. The method for preparing a stainless steel bearing material for a rotor spinning machine according to claim 3, characterized in that, In step S2, the electroslag remelting includes the following steps: after the peeled billet is made into an electrode, it is subjected to electroslag remelting, and the melting rate of the electroslag is 8~13 kg / min.

6. The method for preparing a stainless steel bearing material for a rotor spinning machine according to claim 3, characterized in that, In step S2, the forging heating temperature of the forging billet is 1200~1400℃, and the final forging temperature of the forging billet is 800~900℃.

7. The method for preparing a stainless steel bearing material for a rotor spinning machine according to claim 3, characterized in that, In step S2, the annealing process involves heating, holding at a certain temperature, and cooling sequentially. The heating is performed by heating to 820~880℃ and holding at that temperature, with a holding coefficient of 1.2~1.5 min / mm; the cooling consists of a first cooling stage and a second cooling stage, with different cooling rates for the first cooling stage and the second cooling stage.

8. The method for preparing a stainless steel bearing material for a rotor spinning machine according to claim 7, characterized in that, The first stage of cooling involves cooling to 680°C at a rate of 3-4°C / min; the second stage of cooling involves cooling to 500°C at a rate of 1-2°C / min.

9. A method for preparing a stainless steel bearing material for a rotor spinning machine according to claim 3, characterized in that, The heating and rolling process involves sequential heat treatment, rough rolling, and finish rolling.

10. A stainless steel bearing for a rotor spinning machine, characterized in that, The stainless steel bearing material is prepared by the preparation method of the stainless steel bearing material according to any one of claims 1 to 2 or any one of claims 3 to 9.

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