A forging heat treatment process for a low-carbon bearing steel backing bearing outer ring

Abstract

The present application relates to the technical field of backing bearing outer ring, and particularly relates to a forging heat treatment process of low-carbon bearing steel backing bearing outer ring, at least comprising the following steps: S1, pouring the low-carbon bearing steel backing bearing outer ring raw material after smelting, the pouring temperature is controlled at 1570-1590 DEG C, and the cooling temperature is 500-600 DEG C to form a blank; S2, the blank is subjected to initial forging deformation after pressing the mouth, chamfering and cutting the water gap end; S3, the final forging deformation is carried out at the final forging temperature of 1030-1080 DEG C to obtain a forged piece; S4, the forged piece is subjected to post-forging heat treatment. The low-carbon bearing steel backing bearing outer ring is prepared by adopting the specific forging process and post-forging heat treatment process, has excellent strength and toughness, wear resistance and heat cracking resistance, solves the problems of original outer ring cracking, short service life and frequent peeling, improves the production efficiency and reduces the production cost, and has a good application prospect.

Description

Technical Field

[0001] This invention relates to the field of backing bearing outer ring technology, specifically to a forging heat treatment process for a low-carbon bearing steel backing bearing outer ring. Background Technology

[0002] Backed bearings consist of an outer ring, inner ring, cage, rolling elements, and sealing components. They are typically assembled in the roll systems of multi-roll mills or roller mechanisms, and are widely used, particularly in industrial equipment such as cold rolling mills and straightening machines. The standard replacement cycle for these bearings is set at 30 days. However, in the working environment of multi-roll mills, the bearings must withstand enormous rolling pressures, which often leads to peeling and fragmentation of the outer ring, thus shortening the bearing's service life. Furthermore, with the development of the silicon steel and new energy vehicle industries, silicon steel products are trending towards ultra-thin and ultra-high strength, thus placing new demands on the mechanical properties of the rolls. The original performance of the backed bearing's outer ring can no longer meet the needs of the production line rolling process.

[0003] Chinese patent CN105508416A discloses a backing bearing with a high-carbon chromium bearing steel outer ring. However, in practical applications, this material is prone to cracking and spalling of the outer ring. Chinese patent CN112828236A discloses a forging and heat treatment method for 55Ni40Cr3Al bearing steel, including pre-forging heat treatment, forging, solution treatment, and aging treatment. The room temperature tensile properties of 55Ni40Cr3Al steel forgings obtained using this method are tested, and their tensile strength is 1050-1150 MPa. However, its toughness and tensile strength still need improvement. Summary of the Invention

[0004] To address the problems in the prior art, the present invention provides a forging heat treatment process for the outer ring of a low-carbon bearing steel backing bearing, comprising at least the following steps:

[0005] S1. The low-carbon bearing steel backing bearing outer ring raw material is melted and then cast. The casting temperature is controlled at 1570-1590℃ and the cooling temperature is 500-600℃ to form a billet.

[0006] S2. The billet undergoes initial forging deformation after passing through the clamping jaws, chamfering, and cutting the sprue end.

[0007] S3. Perform final forging deformation at a final forging temperature of 1030-1080℃ to obtain the forging;

[0008] S4. Perform post-forging heat treatment on the forgings.

[0009] In one embodiment, the chemical composition and weight percentage of the low-carbon bearing steel backing bearing outer ring raw material include:

[0010] C: 0.19-0.23wt%, Si: 0.15-0.4wt%, Mn: 0.3-0.6wt%, P: ≤0.015wt%, S: ≤0.008wt%, Cr: 1.25- 1.75wt%, Ni: 3.25-3.75wt%, Mo: ≤0.08wt%, Cu: ≤0.2wt%, Ti: ≤0.002wt%, Al: 0.01-0.04wt%.

[0011] In a preferred embodiment, the content of element C is any one of 0.19wt%, 0.20wt%, 0.21wt%, 0.22wt%, and 0.23wt%.

[0012] In a preferred embodiment, the Si element content is any one of 0.15wt%, 0.25wt%, 0.3wt%, 0.35wt%, and 0.4wt%.

[0013] In a preferred embodiment, the content of the Mn element is any one of 0.3wt%, 0.35wt%, 0.4wt%, 0.5wt%, and 0.6wt%.

[0014] In a preferred embodiment, the content of the P element is either 0.013 wt% or 0.015 wt%.

[0015] In a preferred embodiment, the content of the sulfur element is either 0.006 wt% or 0.008 wt%.

[0016] In a preferred embodiment, the Cr content is any one of 1.25wt%, 1.35wt%, 1.65wt%, and 1.75wt%.

[0017] In a preferred embodiment, the Ni content is any one of 3.25wt%, 3.5wt%, 3.6wt%, and 3.75wt%.

[0018] In a preferred embodiment, the content of the Mo element is any one of 0.05wt%, 0.06wt%, 0.065wt%, 0.07wt%, and 0.08wt%.

[0019] In a preferred embodiment, the Cu element content is any one of 0.15wt%, 0.18wt%, and 0.2wt%.

[0020] In a preferred embodiment, the content of the Ti element is either 0.001 wt% or 0.002 wt%.

[0021] In a preferred embodiment, the content of Al element is any one of 0.01wt%, 0.02wt%, 0.025wt%, 0.03wt%, 0.035wt%, and 0.04wt%.

[0022] In one embodiment, the material of the low-carbon bearing steel backing bearing outer ring is G20Cr2Ni4.

[0023] In a preferred embodiment, the pouring temperature in step S1 is any one of 1570°C, 1575°C, 1580°C, 1585°C, and 1590°C.

[0024] In a preferred embodiment, the cooling temperature in step S1 is any one of 520°C, 540°C, 560°C, 580°C, and 600°C.

[0025] In one embodiment, the initial forging temperature in step S2 is 1100-1200°C.

[0026] In one embodiment, after cooling to 500-600°C in step S1, the hot fitting is heated to 1100-1200°C at a heating rate of no more than 180°C / h, which is used as the initial forging deformation temperature in step S2.

[0027] In a preferred embodiment, the heating rate is any one of 150℃ / h, 155℃ / h, 160℃ / h, 170℃ / h, and 180℃ / h.

[0028] In a preferred embodiment, the initial forging temperature in step S2 is any one of 1100°C, 1120°C, 1150°C, 1180°C, and 1200°C.

[0029] This application's inventive research reveals that the initial forging temperature of the outer ring of the backing bearing needs to be between 1100-1200℃. When the initial forging temperature is below 1100℃, the core of the billet is not sufficiently forged, resulting in significant and uneven differences in grain size and mechanical properties between the core and the surface. When the initial forging temperature is above 1200℃, the forging temperature is too high, which easily leads to grain growth.

[0030] In one embodiment, the forging deformation in step S2 involves 3-4 upsettings and 3-4 drawings, with a forging ratio of 4-5.

[0031] In one embodiment, the upsetting deformation is controlled at 40-50%.

[0032] In a preferred embodiment, the upsetting deformation is any one of 40%, 43%, 45%, 48%, or 50%.

[0033] In one embodiment, the lengthening is performed using a wide anvil strong pressure method, with the amount of pressure applied to each anvil controlled at 30-35%.

[0034] In a preferred embodiment, the pressing amount per anvil is any one of 30%, 32%, 33%, 34%, or 35%.

[0035] In one embodiment, the final forging temperature in step S3 is any one of 1030°C, 1035°C, 1040°C, 1060°C, and 1080°C.

[0036] In this application, the final forging temperature is further controlled at 1030-1080℃, which can improve the fracture toughness of the billet. A possible reason is that when the final forging temperature is high, these insufficiently refined grains have ample opportunity to grow during air cooling, resulting in a coarse and inhomogeneous grain structure after forging. During subsequent heat treatment, the significant energy difference between the inhomogeneous grains leads to a phenomenon where large grains engulf smaller grains, growing larger and larger, i.e., secondary recrystallization occurs, ultimately producing a coarse austenite grain structure. During air cooling, the coarse austenite grains, due to the low ambient temperature and rapid cooling rate, cause the proeutectoid ferrite phase to precipitate in a network along the austenite grain boundaries. The formation of this network ferrite disrupts the intergranular bonding of room-temperature pearlite, leading to a decrease in the impact toughness of the forging.

[0037] In one embodiment, the final forging deformation in step S3 is 20-25%.

[0038] In a preferred embodiment, the final forging deformation in step S3 is any one of 20%, 21%, 22%, 23%, 24%, or 25%.

[0039] In one embodiment, the grain size of the forging after step S3 is grade 7.0-8.0.

[0040] In one embodiment, the S4 post-forging heat treatment step includes:

[0041] a. After step S3, the forgings are air-cooled until the surface temperature of the forging shaft drops to 810-880℃. Then, they are normalized and placed in the furnace for 5-6 hours.

[0042] b. After the heat preservation is completed, the furnace is cooled to 520-660℃ for tempering, and the heat preservation is carried out for 8-12 hours;

[0043] c. After the forgings have been processed in step b, preheat them and place them in a salt bath at 300-500℃ for isothermal heat treatment for 3-5 hours to obtain the final product.

[0044] In one embodiment, after heat preservation in step b, the furnace is cooled at a rate of ≤30℃ / h until the furnace temperature is ≤300℃ and then removed from the furnace.

[0045] In a preferred embodiment, after heat preservation in step b, the furnace is cooled at a rate of ≤20℃ / h until the furnace temperature is ≤200℃ and then removed from the furnace.

[0046] In one embodiment, the preheating temperature in step c is 280-320°C.

[0047] Beneficial effects

[0048] 1. The forging heat treatment process for low-carbon bearing steel backing bearing outer rings provided by this invention improves the uniformity of matrix grains and microstructure, and increases the strength and toughness of the matrix to meet the rolling requirements of ultra-high strength and ultra-thin silicon steel in silicon steel production lines. In particular, the high-temperature strength and toughness are significantly improved, laying a solid foundation for the subsequent final heat treatment process. This can further solve problems such as cracking, short service life, and frequent spalling during use, thereby improving production efficiency and reducing production costs.

[0049] 2. Based on the system of this invention, forging and heat treatment are combined, which not only has the economic benefits of waste heat utilization, but also enables the forging to obtain higher mechanical properties and improve the quality of the forging billet. The low carbon bearing steel backing bearing outer ring prepared has excellent strength, toughness, wear resistance and thermal crack resistance.

[0050] 3. In this invention, by controlling the final forging temperature to 1030-1080℃, the fracture toughness of the billet can be improved.

[0051] 4. The present invention employs a specific forging process to ensure that the forgings obtain a uniform and fine grain structure, providing a good original grain structure for the heat treatment process, and laying the foundation for the forgings to obtain qualified mechanical properties.

[0052] 5. The present invention employs a specific post-forging heat treatment process, which allows hydrogen in the steel to diffuse from the core to the surface and be discharged into the atmosphere, thereby reducing the H content inside the forging shaft and preventing the formation of white spots; on the other hand, it can eliminate the stress inside the forging and the mixed crystal phenomenon of uneven grain size. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0054] Example 1

[0055] This embodiment provides a forging heat treatment process for the outer ring of a low-carbon bearing steel backing bearing, which includes at least the following steps:

[0056] S1. The low-carbon bearing steel backing bearing outer ring raw material is melted and then cast. The casting temperature is controlled at 1570℃, and the cooling temperature is reduced to 520℃ to form a billet. The billet is heated to 1100℃ at a heating rate of 150℃ / h, which is used as the initial forging deformation temperature in step S2.

[0057] S2. The billet undergoes initial forging deformation after passing through the clamping jaws, chamfering, and cutting the sprue end.

[0058] S3. Perform final forging deformation at a final forging temperature of 1030℃ to obtain the forging;

[0059] S4. Perform post-forging heat treatment on the forgings.

[0060] The chemical composition and weight percentage of the raw material for the low-carbon bearing steel backing bearing outer ring include:

[0061] C: 0.2wt%, Si: 0.3wt%, Mn: 0.6wt%, P: ≤0.015wt%, S: ≤0.008wt%, Cr: 1.5wt%, Ni: 3.5wt%, Mo: 0.08wt%, Cu: 0.2wt%, Ti: 0.002wt%, Al: 0.02wt%, with the balance being Fe.

[0062] In step S2, the forging deformation involves three upsetting processes and three drawing processes, with a forging ratio of 4.

[0063] The upsetting deformation is 40%.

[0064] The lengthening process employs a wide anvil strong pressure method, with the pressure applied to each anvil controlled at 30%.

[0065] The final forging deformation in step S3 is 20%.

[0066] The S4 post-forging heat treatment step includes:

[0067] a. After step S3, the forgings are air-cooled and the surface temperature of the forging shaft is reduced to 860℃ for normalizing. The forgings are then placed in the furnace and held for 5.5 hours.

[0068] b. After the heat preservation is completed, the furnace is cooled to 600°C for tempering, and the heat preservation is carried out for 10 hours. Then, the furnace is cooled at a rate of 20°C / h until the furnace temperature is 200°C.

[0069] c. Preheat the forgings processed in step b to 300°C, place them in a 400°C salt bath for isothermal heat treatment, and maintain for 4 hours to obtain the final product.

[0070] Example 2

[0071] This embodiment provides a forging heat treatment process for the outer ring of a low-carbon bearing steel backing bearing, which includes at least the following steps:

[0072] S1. The low-carbon bearing steel backing bearing outer ring raw material is melted and then cast. The casting temperature is controlled at 1575℃ and the cooling temperature is reduced to 540℃ to form a billet. The billet is heated to 1120℃ at a heating rate of 155℃ / h, which is used as the initial forging deformation temperature in step S2.

[0073] S2. The billet undergoes initial forging deformation after passing through the clamping jaws, chamfering, and cutting the sprue end.

[0074] S3. Perform final forging deformation at a final forging temperature of 1035℃ to obtain the forging;

[0075] S4. Perform post-forging heat treatment on the forgings.

[0076] The chemical composition and weight percentage of the raw material for the low-carbon bearing steel backing bearing outer ring include:

[0077] C: 0.19wt%, Si: 0.15wt%, Mn: 0.3wt%, P: 0.015wt%, S: 0.008wt%, Cr: 1.25wt%, Ni: 3.25wt%, Mo: 0.05wt%, Cu: 0.2wt%, Ti: 0.002wt%, Al: 0.025wt%, with the balance being Fe.

[0078] In step S2, the forging deformation involves three upsetting processes and three drawing processes, with a forging ratio of 4.

[0079] The upsetting deformation is 43%.

[0080] The lengthening process employs a wide anvil strong pressure method, with the pressure applied to each anvil controlled at 32%.

[0081] The final forging deformation in step S3 is 21%.

[0082] The S4 post-forging heat treatment step includes:

[0083] a. After step S3, the forgings are air-cooled and the surface temperature of the forging shaft is reduced to 860℃ for normalizing. The forgings are then placed in the furnace and held for 5.5 hours.

[0084] b. After the heat preservation is completed, the furnace is cooled to 600°C for tempering, and the heat preservation is carried out for 10 hours. Then, the furnace is cooled at a rate of 20°C / h until the furnace temperature is 200°C.

[0085] c. Preheat the forgings processed in step b to 300°C, place them in a 400°C salt bath for isothermal heat treatment, and maintain for 4 hours to obtain the final product.

[0086] Example 3

[0087] This embodiment provides a forging heat treatment process for the outer ring of a low-carbon bearing steel backing bearing, which includes at least the following steps:

[0088] S1. The low-carbon bearing steel backing bearing outer ring raw material is melted and then cast. The casting temperature is controlled at 1580℃, and the cooling temperature is reduced to 560℃ to form a billet. The billet is heated to 1150℃ at a heating rate of 160℃ / h, which is used as the initial forging deformation temperature in step S2.

[0089] S2. The billet undergoes initial forging deformation after passing through the clamping jaws, chamfering, and cutting the sprue end.

[0090] S3. Perform final forging deformation at a final forging temperature of 1040℃ to obtain the forging;

[0091] S4. Perform post-forging heat treatment on the forgings.

[0092] The chemical composition and weight percentage of the raw material for the low-carbon bearing steel backing bearing outer ring include:

[0093] C: 0.21wt%, Si: 0.25wt%, Mn: 0.35wt%, P: 0.015wt%, S: 0.008wt%, Cr: 1.35wt%, Ni: 3.5wt%, Mo: 0.06wt%, Cu: 0.15wt%, Ti: 0.001wt%, Al: 0.032wt%, with the balance being Fe.

[0094] In step S2, the forging deformation involves four upsetting processes and three drawing processes, with a forging ratio of 4.

[0095] The upsetting deformation is 45%.

[0096] The lengthening process employs a wide anvil strong pressure method, with the pressure applied to each anvil controlled at 33%.

[0097] The final forging deformation in step S3 is 22%.

[0098] The S4 post-forging heat treatment step includes:

[0099] a. After step S3, the forgings are air-cooled and the surface temperature of the forging shaft is reduced to 860℃ for normalizing. The forgings are then placed in the furnace and held for 5.5 hours.

[0100] b. After the heat preservation is completed, the furnace is cooled to 600°C for tempering, and the heat preservation is carried out for 10 hours. Then, the furnace is cooled at a rate of 20°C / h until the furnace temperature is 200°C.

[0101] c. Preheat the forgings processed in step b to 300°C, place them in a 400°C salt bath for isothermal heat treatment, and maintain for 4 hours to obtain the final product.

[0102] Example 4

[0103] This embodiment provides a forging heat treatment process for the outer ring of a low-carbon bearing steel backing bearing, which includes at least the following steps:

[0104] S1. The low-carbon bearing steel backing bearing outer ring raw material is melted and then cast. The casting temperature is controlled at 1585℃, and the cooling temperature is reduced to 580℃ to form a billet. The billet is heated to 1180℃ at a heating rate of 170℃ / h, which is used as the initial forging deformation temperature in step S2.

[0105] S2. The billet undergoes initial forging deformation after passing through the clamping jaws, chamfering, and cutting the sprue end.

[0106] S3. Perform final forging deformation at a final forging temperature of 1060℃ to obtain the forging;

[0107] S4. Perform post-forging heat treatment on the forgings.

[0108] The chemical composition and weight percentage of the raw material for the low-carbon bearing steel backing bearing outer ring include:

[0109] C: 0.22wt%, Si: 0.35wt%, Mn: 0.4wt%, P: 0.015wt%, S: 0.008wt%, Cr: 1.65wt%, Ni: 3.6wt%, Mo: 0.065wt%, Cu: 0.18wt%, Ti: 0.001wt%, Al: 0.04wt%, with the balance being Fe.

[0110] In step S2, the forging deformation involves four upsetting processes and four drawing processes, with a forging ratio of 5.

[0111] The upsetting deformation is 48%.

[0112] The lengthening process employs a wide anvil strong pressure method, with the pressure applied to each anvil controlled at 34%.

[0113] The final forging deformation in step S3 is 23%.

[0114] The S4 post-forging heat treatment step includes:

[0115] a. After step S3, the forgings are air-cooled and the surface temperature of the forging shaft is reduced to 860℃ for normalizing. The forgings are then placed in the furnace and held for 5.5 hours.

[0116] b. After the heat preservation is completed, the furnace is cooled to 600°C for tempering, and the heat preservation is carried out for 10 hours. Then, the furnace is cooled at a rate of 20°C / h until the furnace temperature is 200°C.

[0117] c. Preheat the forgings processed in step b to 300°C, place them in a 400°C salt bath for isothermal heat treatment, and maintain for 4 hours to obtain the final product.

[0118] Example 5

[0119] This embodiment provides a forging heat treatment process for the outer ring of a low-carbon bearing steel backing bearing, which includes at least the following steps:

[0120] S1. The low-carbon bearing steel backing bearing outer ring raw material is melted and then cast. The casting temperature is controlled at 1590℃, and the cooling temperature is reduced to 600℃ to form a billet. The billet is heated to 1200℃ at a heating rate of 180℃ / h, which is used as the initial forging deformation temperature in step S2.

[0121] S2. The billet undergoes initial forging deformation after passing through the clamping jaws, chamfering, and cutting the sprue end.

[0122] S3. Perform final forging deformation at a final forging temperature of 1080℃ to obtain the forging;

[0123] S4. Perform post-forging heat treatment on the forgings.

[0124] The chemical composition and weight percentage of the raw material for the low-carbon bearing steel backing bearing outer ring include:

[0125] C: 0.23wt%, Si: 0.4wt%, Mn: 0.5wt%, P: 0.015wt%, S: 0.008wt%, Cr: 1.75wt%, Ni: 3.75wt%, Mo: 0.07wt%, Cu: 0.2wt%, Ti: 0.001wt%, Al: 0.04wt%, with the balance being Fe.

[0126] In step S2, the forging deformation involves four upsetting processes and four drawing processes, with a forging ratio of 5.

[0127] The upsetting deformation is 50%.

[0128] The lengthening process employs a wide anvil strong pressure method, with the pressure applied to each anvil controlled at 35%.

[0129] The final forging deformation in step S3 is 25%.

[0130] The S4 post-forging heat treatment step includes:

[0131] a. After step S3, the forgings are air-cooled and the surface temperature of the forging shaft is reduced to 860℃ for normalizing. The forgings are then placed in the furnace and held for 5.5 hours.

[0132] b. After the heat preservation is completed, the furnace is cooled to 600°C for tempering, and the heat preservation is carried out for 10 hours. Then, the furnace is cooled at a rate of 20°C / h until the furnace temperature is 200°C.

[0133] c. Preheat the forgings processed in step b to 300°C, place them in a 400°C salt bath for isothermal heat treatment, and maintain for 4 hours to obtain the final product.

[0134] Performance testing

[0135] 1. Room temperature mechanical property test: The low carbon bearing steel backing bearing outer rings prepared in Examples 1-5 and the original backing bearing outer rings (KOYO bearings) were tested for room temperature mechanical properties in accordance with GB / T 13313 Shore and Leeb hardness test method for rolls and GB / T228.1-2010 tensile testing of metallic materials - Part 1: tensile testing at room temperature. The test results are shown in Table 1.

[0136] 2. Average rolling mileage per run: The outer ring of the low-carbon bearing steel backing bearing prepared in Example 5 and the outer ring of the original backing bearing were tested. The test results are shown in Table 2.

[0137] Table 1

[0138]

[0139]

[0140] Table 2

[0141] sample Average rolling kilometers per slot per run / km Example 5 12150 Original backing bearing outer ring 9000

[0142] As shown in Tables 1-2, the outer ring of the backed bearing in Examples 1-5 has a tensile strength of 1700-1800 MPa at room temperature and an impact energy of A. KV2 Its J is 38-46, and its hardness HRC is 48-52.

[0143] The outer ring of the backing bearing prepared by this invention, after undergoing the same final heat treatment process, has an average rolling mileage of 12,150 km per run, which is 35% higher than the average rolling mileage of 9,000 km per run of the original backing bearing outer ring.

Claims

1. A forging heat treatment process for a low-carbon bearing steel backing bearing outer ring, characterized in that, At least the following steps are included: S1. The low-carbon bearing steel backing bearing outer ring raw material is melted and then cast. The casting temperature is controlled at 1570-1590℃ and the cooling temperature is 500-600℃ to form a billet. S2. The billet undergoes initial forging deformation after passing through the clamping jaws, chamfering, and cutting the sprue end. S3. Perform final forging deformation at a final forging temperature of 1030-1080℃ to obtain the forging; S4. Perform post-forging heat treatment on the forgings; The S4 step includes: a. After step S3, the forgings are air-cooled until the surface temperature of the forging shaft drops to 810-880℃. Then, they are normalized and placed in the furnace for 5-6 hours. b. After the heat preservation is completed, the furnace is cooled to 520-660℃ for tempering, and the heat preservation is carried out for 8-12 hours; c. Preheat the forgings processed in step b, place them in a salt bath at 300-500℃, and perform isothermal heat treatment for 3-5 hours to obtain the final product. In step b, after heat preservation, the furnace is cooled at a rate of ≤30℃ / h, and the furnace is removed when the furnace temperature is ≤300℃. The preheating temperature in step c is 280-320℃.

2. The forging heat treatment process for the low-carbon bearing steel backing bearing outer ring according to claim 1, characterized in that, The chemical composition and weight percentage of the raw material for the low-carbon bearing steel backing bearing outer ring include: C: 0.19-0.23wt%, Si: 0.15-0.4wt%, Mn: 0.3-0.6wt%, P: ≤0.015wt%, S: ≤0.008wt%, Cr: 1.25- 1.75wt%, Ni: 3.25-3.75wt%, Mo: ≤0.08wt%, Cu: ≤0.2wt%, Ti: ≤0.002wt%, Al: 0.01-0.04wt%.

3. The forging heat treatment process for the low-carbon bearing steel backing bearing outer ring according to claim 1, characterized in that, The initial forging temperature in step S2 is 1100-1200℃.

4. The forging heat treatment process for the low-carbon bearing steel backing bearing outer ring according to claim 3, characterized in that, In step S2, the forging deformation involves 3-4 upsettings and 3-4 drawings, with a forging ratio of 4-5.

5. The forging heat treatment process for the low-carbon bearing steel backing bearing outer ring according to claim 4, characterized in that, The upsetting deformation is controlled at 40-50%.

6. The forging heat treatment process for the low-carbon bearing steel backing bearing outer ring according to claim 4, characterized in that, The lengthening process employs a wide anvil strong pressure method, with the pressure applied to each anvil controlled at 30-35%.

7. The forging heat treatment process for the low-carbon bearing steel backing bearing outer ring according to claim 1, characterized in that, The final forging deformation in step S3 is 20-25%.

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