A forming method for a large thin-walled stainless steel ring part and the large thin-walled stainless steel ring part

Abstract

The present invention discloses a forming method for a large-sized thin-walled stainless steel ring part, which comprises the following steps: using a stainless steel coil formed by stainless steel thin plates as raw materials; pulling the stainless steel thin plates to the outside of the ring part tooling, and clamping the upper and lower ends on the stainless steel thin plates to the ring part tooling; starting the ring rolling mill, the stainless steel thin plates rotate synchronously with the ring part tooling, and the ring rolling mill radially rolls the stainless steel thin plates so that the stainless steel thin plates are attached to the outer wall of the ring part tooling; after the stainless steel thin plates move circumferentially with the ring part tooling for one week, cutting the stainless steel thin plates, and then butt-welding the opposite head and tail ends of the stainless steel thin plates outside the ring part tooling into a whole; after welding is completed, continue to start the ring rolling mill to reciprocally roll the weld area to obtain a welded thin-walled ring part; annealing the ring part tooling together with the thin-walled ring part, and then removing the thin-walled ring part. The present invention can prepare large-sized thin-walled stainless steel ring parts with high weld strength and high forming accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of profile processing, and in particular to a forming method for a large thin-walled stainless steel ring part and a large thin-walled stainless steel ring part. Background Art

[0002] Ring parts, as key main structural parts of rockets, play an important role in space engineering. At present, high-strength aluminum alloy ring parts are relatively common in practical applications. In recent years, with the continuous development and exploration of materials science, some researchers have attempted to use stainless steel as the material for preparing ring parts. However, such ring parts prepared from stainless steel are typical thin-walled and weak-rigid ring parts, and a series of problems that need to be solved urgently have emerged during the forming process.

[0003] Specifically, during the forming process, such ring parts prepared from stainless steel are prone to instability. Due to their thin-walled and weak-rigid structural characteristics, it is difficult to maintain a stable shape and structure under the action of processing stress, and they are prone to deformation or even damage, seriously affecting product quality and production efficiency; moreover, after the sheet is bent, a large amount of residual stress will be generated. The existence of this residual stress leads to uneven stress distribution inside the ring part, forming stress concentration and significantly reducing the mechanical properties and fatigue life of the ring part. In addition, the problem of springback deformation causes the size of the processed ring part to deviate from the expected design size, making it difficult to meet the high-precision size requirements, greatly limiting its application in practical engineering. Therefore, the forming preparation of 10m-class thin-walled stainless steel ring parts is still a research difficulty, and the existence of the above problems seriously restricts the popularization and application of such large thin-walled stainless steel ring parts in the aerospace and related industrial fields.

[0004] In the prior art, most ordinary thin-walled stainless steel ring parts adopt a multi-forging and welding process, that is, a rolling bender is used to bend stainless steel sheets into arc-shaped plates with a certain radian, and then multiple arc-shaped plates are welded together to form a ring part. When using such a process to prepare 10m-class thin-walled stainless steel ring parts, direct ring rolling forming cannot be carried out, but a multi-segment welding process needs to be adopted, with complex processes, increased welds, and increased weak areas of the ring part; if other processes such as uncoiling and single welding are used, due to the high strength and high hardness characteristics of the material, large deformation and stress will be generated during the bending process of the thin sheet, resulting in difficult size control. Therefore, the existing preparation processes all have different degrees of technical bottlenecks when facing the manufacture of 10m-class thin-walled stainless steel ring parts, and cannot efficiently and high-qualityly realize the production of such large thin-walled stainless steel ring parts. In view of this, the present invention aims to develop an innovative forming method for large thin-walled stainless steel ring parts to solve the problem of difficult manufacture of 10-meter-class thin-walled stainless steel ring parts. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a forming method for large thin-walled stainless steel ring parts, so as to solve the problem of difficult manufacturing of thin-walled stainless steel ring parts with a diameter of 10 meters, and to provide a large thin-walled ring part with excellent performance.

[0006] The technical problem to be solved by the present invention is realized by adopting the following technical solutions:

[0007] A forming method for large thin-walled stainless steel ring parts includes the following steps:

[0008] Raw material preparation: Using a stainless steel coil formed by stainless steel thin plates as the raw material;

[0009] Pretreatment: Prepare the ring part tooling for standby, and the outer diameter of the ring part tooling is the same as the inner diameter of the target thin-walled ring part; Traction the stainless steel thin plate to the outside of the ring part tooling, and clamp the upper and lower ends of the stainless steel thin plate with the ring part tooling;

[0010] Ring rolling treatment: Start the ring rolling mill, the stainless steel thin plate rotates synchronously with the ring part tooling, and the ring rolling mill performs radial rolling on the stainless steel thin plate so that the stainless steel thin plate fits against the outer wall of the ring part tooling;

[0011] Cutting and welding: After the stainless steel thin plate makes a circular motion around the circumference of the ring part tooling for one week, cut off the stainless steel thin plate, and then butt-weld the opposite head and tail ends of the stainless steel thin plate outside the ring part tooling into a whole;

[0012] Local cold deformation: After welding is completed, continue to start the ring rolling mill to reciprocally roll the weld area to obtain the welded thin-walled ring part;

[0013] Stress relief: Anneal the ring part tooling together with the thin-walled ring part, and then remove the thin-walled ring part.

[0014] Furthermore, the thickness of the stainless steel thin plate is 3 - 5 mm, the width is 1000 - 2000 mm, the tensile strength > 1035 MPa, the yield strength ≥ 760 MPa, and the elongation rate ≥ 6%.

[0015] Furthermore, in the pretreatment step, the ring part tooling is a steel mold, and the cross-sectional thickness of the ring part tooling is 30 - 70 mm.

[0016] Furthermore, in the ring rolling treatment step, the linear speed of the main roll is 0.8 - 1.2 m / s, the radial rolling speed is 0.1 - 0.2 mm / s, and the radial feed time is 15 - 30 s.

[0017] Furthermore, in the cutting and welding step, after the stainless steel thin plate is cut off, the cut is polished before welding. After welding is completed, the weld area is 0.5 - 1 mm higher than the body.

[0018] Further, in the cutting and welding steps, the welding power is 6 - 12 kW, and the welding speed is 0.8 - 1.5 m / min.

[0019] Further, in the local cold deformation step, the feed speed of the main roll of the ring rolling mill is 0.05 - 0.1 mm / s, and it is rolled back and forth 3 - 5 passes in the weld area.

[0020] Further, the annealing treatment is carried out in a heating furnace, the heating temperature is 200 - 300 °C, and the holding time is 3 - 6 h.

[0021] A large thin - walled stainless - steel ring is prepared by using any of the above - mentioned methods. The tensile strength of the large thin - walled stainless - steel ring is ≥870 MPa, the yield strength is ≥420 MPa, the elongation is ≥12.5%, and the out - of - roundness is ≤0.1%.

[0022] Beneficial effects: The forming method of the large thin - walled stainless - steel ring described in the present invention can use stainless steel as raw material to prepare a large thin - walled stainless - steel ring with a diameter of 10 m level. By using the ring rolling process to uncoil and combining with stress - relieving annealing, the springback stress after large - bending deformation of high - strength stainless - steel plates is reduced; local ring - rolling cold deformation is adopted to improve the strength of the weld area. In addition, by combining stress - relieving annealing and other processes and strictly controlling the parameter conditions, the prepared large thin - walled stainless - steel ring has a tensile strength ≥870 MPa, a yield strength ≥420 MPa, an elongation ≥12.5%, and an out - of - roundness ≤0.1%. It has excellent performance and can well meet the requirements of the aerospace and related industrial fields. The technological process of the present invention is simple, the processing cost is low, and it is suitable for large - scale processing and production. Description of the Drawings

[0023] Figure 1 It is a schematic diagram of the ring - rolling treatment step in the present invention.

[0024] Figure 2 It is a schematic diagram of the welding treatment step in the present invention.

[0025] Wherein: 1, stainless - steel thin plate; 2, ring - part tooling; 3, main roll; 4, core roll; 5, clamping part; 6, weld area. Detailed Description of the Invention

[0026] In order to make the technical means, creative features, achieved objectives and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0027] Example 1

[0028] The forming method of the large thin - walled stainless - steel ring described in this example has a ring diameter of Φ10 m and includes the following steps:

[0029] Raw material preparation: Use a stainless steel coil formed by a stainless steel thin plate 1 as the raw material. The stainless steel thin plate 1 is a 316 hardened stainless steel thin plate with a thickness of 4 mm, a width of 1200 mm, a tensile strength > 1035 MPa, a yield strength ≥ 760 MPa, and an elongation ≥ 6%;

[0030] Pretreatment: Use 5CrNiMo die steel and prepare a ring-shaped tooling 2 with an outer diameter of 10 m by the conventional ring rolling process for standby. The cross-sectional thickness of the ring-shaped tooling 2 is 50 mm; Place the stainless steel coil vertically, and draw the stainless steel thin plate 1 on the stainless steel coil to the outside of the ring-shaped tooling 2. As Figure 1 shown, at a position 300 mm from the head end of the stainless steel thin plate 1, clamp the upper and lower ends of the stainless steel thin plate to the ring-shaped tooling 2 through a clamping member 5;

[0031] Ring rolling treatment: Start the ring rolling mill. The main roll 3 and the core roll 4 of the ring rolling mill drive the stainless steel thin plate 1 to rotate synchronously with the ring-shaped tooling 3. The linear speed of the main roll 3 is 1.0 m / s, the radial rolling speed is 0.12 mm / s, and the radial feed time is 18 s; After radial rolling, make the stainless steel thin plate 1 fit with the ring-shaped tooling 2;

[0032] Cutting and welding: The stainless steel thin plate 1 continues to move circumferentially with the ring-shaped tooling 2 for one week, cut the stainless steel thin plate 1, polish the cut, and then weld the butt ends of the head and tail of the stainless steel thin plate 1 on the ring-shaped tooling 2 into a whole. The weld area 6 is as Figure 2 shown; The welding power is 10 kW, the welding speed is 1.2 m / min. After welding, the weld area is 0.6 mm higher than the body.

[0033] Local cold deformation: After welding, continue to start the ring rolling mill to reciprocally roll the weld area 6. The feed speed of the main roll 3 of the ring rolling mill is 0.07 mm / s, and reciprocally roll 4 passes in the weld area to obtain a welded thin-walled ring;

[0034] Stress relief: Anneal the ring-shaped tooling 2 together with the thin-walled ring. The annealing treatment is carried out in a heating furnace, the heating temperature is 220 °C, and the holding time is 4 h. After the annealing treatment is completed, remove the thin-walled ring.

[0035] Example 2

[0036] The forming method of the large thin-walled stainless steel ring described in this example, with a ring diameter of Φ12 m, includes the following steps:

[0037] Raw material preparation: Use a stainless steel coil formed by a stainless steel thin plate as the raw material. The stainless steel thin plate is a 316 hardened stainless steel thin plate with a thickness of 5 mm, a width of 1600 mm, a tensile strength > 1035 MPa, a yield strength ≥ 760 MPa, and an elongation ≥ 6%;

[0038] Pretreatment: Use 42CrMo die steel and conventional ring rolling process to prepare a ring tool with an outer diameter of 12mm. The cross-sectional thickness of the ring tool is 50mm. Place the stainless steel coil vertically and pull the stainless steel sheet on the stainless steel coil to the outside of the ring tool. Figure 1 As shown, clamp the upper and lower ends of the stainless steel sheet to the ring fixture at a distance of 280 mm from the head end of the stainless steel sheet;

[0039] Ring rolling process: Start the ring rolling mill. The main roller and core roller of the ring rolling mill drive the stainless steel sheet to rotate synchronously with the ring tooling. The main roller linear speed is 1.2m / s, the radial rolling speed is 0.15mm / s, and the radial feed time is 25s. After radial rolling, the stainless steel sheet is bonded to the ring tooling.

[0040] Cutting and welding: The stainless steel sheet continues to move in a circular motion along with the ring fixture. The stainless steel sheet is cut and the cut is polished. Then, the opposite ends of the stainless steel sheet on the ring fixture are welded together into a whole. The welding power is 6 kW and the welding speed is 1.5 m / min. After welding is completed, the weld area is 0.8 mm higher than the main body.

[0041] Local cold deformation: After welding is completed, the ring rolling mill is started to reciprocate the weld area. The main roller feed speed of the ring rolling mill is 0.1mm / s. The weld area is reciprocated for 3 times to obtain the welded thin-walled ring.

[0042] Stress relief: Anneal the ring fixture together with the thin-walled ring. The annealing process is carried out in a heating furnace at a heating temperature of 280°C and a holding time of 5 hours. After the annealing process is completed, remove the thin-walled ring.

[0043] Comparative Example 1

[0044] The method for forming a large thin-walled stainless steel ring described in this comparative example, wherein the ring has a diameter of Φ10m, comprises the following steps:

[0045] Raw material preparation: stainless steel coils formed from stainless steel sheets are used as raw materials. The stainless steel sheets are 316 hardened stainless steel sheets with a thickness of 4mm and a width of 1200mm. The tensile strength is greater than 1035MPa, the yield strength is greater than 760MPa, and the elongation is greater than 6%.

[0046] Pretreatment: Use 5CrNiMo die steel and conventional ring rolling process to prepare a ring tool with an outer diameter of 10m. The cross-sectional thickness of the ring tool is 50mm. Place the stainless steel coil vertically and pull the stainless steel sheet on the stainless steel coil to the outside of the ring tool. Figure 1 As shown, clamp the upper and lower ends of the stainless steel sheet to the ring fixture at a distance of 300 mm from the head end of the stainless steel sheet;

[0047] Ring rolling process: Start the ring rolling mill. The main roller 3 and core roller 4 of the ring rolling mill drive the stainless steel sheet to rotate synchronously with the ring tooling. The main roller linear speed is 1.0m / s, the radial rolling speed is 0.12mm / s, and the radial feed time is 18s. After radial rolling, the stainless steel sheet is bonded to the ring tooling.

[0048] Cutting and welding: The stainless steel sheet continues to move in a circular motion along with the ring fixture for one round. The stainless steel sheet 1 is cut and the cut is polished. Then, the head and tail ends of the stainless steel sheet on the ring fixture are welded together into a whole. The welding power is 10kW and the welding speed is 1.2 m / min. After welding is completed, the weld area is 0.6 mm higher than the main body.

[0049] Stress relief: Anneal the ring fixture together with the thin-walled ring. The annealing process is carried out in a heating furnace at a heating temperature of 220°C and a holding time of 4 hours. After the annealing process is completed, remove the thin-walled ring.

[0050] Comparative Example 2

[0051] The method for forming a large thin-walled stainless steel ring described in this embodiment, wherein the ring has a diameter of Φ10m, comprises the following steps:

[0052] Raw material preparation: stainless steel coils formed from stainless steel sheets are used as raw materials. The stainless steel sheets are 316 hardened stainless steel sheets with a thickness of 4mm and a width of 1200mm. The tensile strength is greater than 1035MPa, the yield strength is greater than 760MPa, and the elongation is greater than 6%.

[0053] Pretreatment: Use 5CrNiMo die steel and conventional ring rolling process to prepare a ring tool with an outer diameter of 10m. The cross-sectional thickness of the ring tool is 50mm. Place the stainless steel coil vertically and pull the stainless steel sheet on the stainless steel coil to the outside of the ring tool. Figure 1 As shown, clamp the upper and lower ends of the stainless steel sheet to the ring fixture at a distance of 300 mm from the head end of the stainless steel sheet;

[0054] Ring rolling process: Start the ring rolling mill. The main roller and core roller of the ring rolling mill drive the stainless steel sheet to rotate synchronously with the ring tooling. The main roller linear speed is 1.0m / s, the radial rolling speed is 0.12mm / s, and the radial feed time is 18s. After radial rolling, the stainless steel sheet is bonded to the ring tooling.

[0055] Cutting and welding: The stainless-steel thin plate continues to move circumferentially with the ring-shaped workpiece fixture for one full circle, cutting the stainless-steel thin plate, grinding the cut, and then welding the opposite head and tail docking ends of the stainless-steel thin plate on the ring-shaped workpiece fixture into a whole; the welding power is 10 kW, the welding speed is 1.2 m / min, and after welding, the weld area is 0.6 mm higher than the body.

[0056] Local cold deformation: After welding is completed, continue to start the ring rolling mill to reciprocally roll the weld area. The feed speed of the main roll of the ring rolling mill is 0.07 mm / s, and after reciprocally rolling 4 passes in the weld area, the welded thin-walled ring workpiece is obtained, and then the thin-walled ring workpiece can be removed.

[0057] Control Example 3

[0058] The forming method of the large thin-walled stainless-steel ring workpiece described in this embodiment, with the ring diameter of Φ10 m, includes the following steps:

[0059] Raw material preparation: Using a stainless-steel coil formed by a stainless-steel thin plate as the raw material, the stainless-steel thin plate is a 316 hardened stainless-steel thin plate, with a thickness of 4 mm, a width of 1200 mm, a tensile strength of 935 MPa, a yield strength of 560 MPa, and an elongation of 8%.

[0060] Pretreatment: Using 5CrNiMo die steel, preparing a ring-shaped workpiece fixture with an outer diameter of 10 m by conventional ring rolling process, and the cross-sectional thickness of the ring-shaped workpiece fixture is 50 mm; placing the stainless-steel coil vertically, pulling the stainless-steel thin plate on the stainless-steel coil to the outside of the ring-shaped workpiece fixture, and clamping the upper and lower ends of the stainless-steel thin plate with the ring-shaped workpiece fixture through a clamping member at a position 300 mm from the head end of the stainless-steel thin plate.

[0061] Ring rolling treatment: Start the ring rolling mill, and the main roll and core roll of the ring rolling mill drive the stainless-steel thin plate to rotate synchronously with the ring-shaped workpiece fixture. The linear speed of the main roll is 1.0 m / s, the radial rolling speed is 0.12 mm / s, and the radial feed time is 18 s; after radial rolling, the stainless-steel thin plate is fitted to the ring-shaped workpiece fixture.

[0062] Cutting and welding: The stainless-steel thin plate continues to move circumferentially with the ring-shaped workpiece fixture for one full circle, cutting the stainless-steel thin plate, grinding the cut, and then welding the opposite head and tail docking ends of the stainless-steel thin plate on the ring-shaped workpiece fixture into a whole; the welding power is 10 kW, the welding speed is 1.2 m / min, and after welding, the weld area is 0.6 mm higher than the body.

[0063] Local cold deformation: After welding is completed, continue to start the ring rolling mill to reciprocally roll the weld area. The feed speed of the main roll of the ring rolling mill is 0.07 mm / s, and after reciprocally rolling 4 passes in the weld area, the welded thin-walled ring workpiece is obtained;

[0064] Stress relief: Anneal the ring tooling together with the thin-walled ring. The annealing is carried out in a heating furnace at a heating temperature of 220 °C for a holding time of 4 h. After the annealing is completed, the thin-walled ring can be removed.

[0065] Control Example 4

[0066] The forming method of the large thin-walled stainless steel ring described in this embodiment has a ring diameter of Φ10 m and includes the following steps:

[0067] Raw material preparation: Use a stainless steel coil formed by stainless steel sheets as the raw material. The stainless steel sheet is a 316 hardened stainless steel sheet with a thickness of 4 mm, a width of 1200 mm, a tensile strength > 1035 MPa, a yield strength ≥ 760 MPa, and an elongation ≥ 6%.

[0068] Pretreatment: Use 5CrNiMo die steel and prepare a ring tooling with an outer diameter of 10 m for standby by conventional ring rolling technology. The cross-sectional thickness of the ring tooling is 50 mm; Place the stainless steel coil vertically, pull the stainless steel sheet on the stainless steel coil to the outside of the ring tooling, and clamp the upper and lower ends of the stainless steel sheet to the ring tooling with a clamping piece 300 mm from the head end of the stainless steel sheet.

[0069] Ring rolling treatment: Start the ring rolling mill. The main roll and the core roll of the ring rolling mill drive the stainless steel sheet to rotate synchronously with the ring tooling. The linear speed of the main roll is 1.0 m / s, the radial rolling speed is 0.12 mm / s, and the radial feed time is 40 s; After radial rolling, the stainless steel sheet is fitted to the ring tooling.

[0070] Cutting and welding: The stainless steel sheet continues to move circumferentially with the ring tooling for one week, cut the stainless steel sheet, polish the cut, and then weld the head and tail butt ends of the stainless steel sheet on the ring tooling into a whole; The welding power is 10 kW, the welding speed is 1.2 m / min. After welding, the weld area is 0.6 mm higher than the body.

[0071] Local cold deformation: After welding, continue to start the ring rolling mill to reciprocally roll the weld area. The feed speed of the main roll of the ring rolling mill is 0.07 mm / s, and the weld area is reciprocally rolled 4 times to obtain the welded thin-walled ring.

[0072] Stress relief: Anneal the ring tooling together with the thin-walled ring. The annealing is carried out in a heating furnace at a heating temperature of 220 °C for a holding time of 4 h. After the annealing is completed, the thin-walled ring can be removed.

[0073] Control Example 5

[0074] Using 2219 aluminum alloy thin plate as raw material, with the performance of tensile strength ≥ 415 MPa, yield strength ≥ 330 MPa, and elongation ≥ 6%; adopting the scheme of welding four curved plates into a Φ10m ring, where the curved plates are rolled out of the corresponding size by a rolling machine.

[0075] Control Example 6

[0076] Using stainless steel thin plate as raw material, with the performance of tensile strength > 1035 MPa, yield strength ≥ 760 MPa, and elongation ≥ 6%; adopting the scheme of welding four curved plates into a Φ10m ring, where the curved plates are rolled out of the corresponding size by a rolling machine.

[0077] The performance at the weld and the dimensional accuracy of the thin-walled ring parts obtained in each example and control example were detected, and the detection results are shown in Table 1. Among them, the mechanical properties were detected in accordance with GB / T228.1; the out-of-roundness was calculated according to the following formula: O = [(D1 - D2) / (D1 + D2)] × 100%, where: O - out-of-roundness; D1 - the measured value of the larger diameter, in millimeters (mm); D2 - the measured value of the smaller diameter, in millimeters (mm); the out-of-roundness of the ring part was defined as the average value of three groups of out-of-roundness.

[0078] Table 1 Statistical table of the performance and dimensional accuracy of thin-walled ring parts

[0079]

[0080] As can be seen from Table 1, by using the method of the present invention, problems such as high residual stress, deformation springback, and poor weld strength that are prone to occur in the preparation of large thin-walled hardened stainless steel ring parts by traditional processes can be solved. Large thin-walled ring parts with high weld strength and high forming accuracy can be manufactured, thereby realizing the efficient and high-quality production of such large thin-walled stainless steel ring parts, and the products prepared can meet the relevant standards in terms of performance, which can further promote the popularization and application of such large thin-walled stainless steel ring parts in the aerospace and related industrial fields. From the control examples, it can be seen that in the present invention, the combined treatment of local cold deformation and stress relief is crucial, and the ring rolling treatment and raw material treatment have a greater impact on the results.

[0081] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A forming method for a large thin-walled stainless steel ring part, characterized in that, The steps include: Raw material preparation: stainless steel coils formed from stainless steel sheets are used as raw materials; Pretreatment: Prepare the ring tooling. The outer diameter of the ring tooling should be the same as the inner diameter of the target thin-walled ring. Pull the stainless steel sheet to the outside of the ring tooling and clamp the upper and lower ends of the stainless steel sheet to the ring tooling. Ring rolling treatment: Start the ring rolling mill, the stainless steel sheet rotates synchronously with the ring tooling, and the ring rolling mill radially rolls the stainless steel sheet to make the stainless steel sheet fit the outer wall of the ring tooling; Cutting and welding: After the stainless steel sheet moves in a circle with the ring fixture, the stainless steel sheet is cut off, and then the opposite head and tail ends of the stainless steel sheet on the outside of the ring fixture are welded into a whole; Local cold deformation: After welding is completed, the ring rolling mill is started to reciprocate and roll the weld area to obtain a welded thin-walled ring. Stress relief: anneal the ring fixture together with the thin-walled ring, and then remove the thin-walled ring.

2. The forming method of the large thin-walled stainless steel ring part according to claim 1, wherein The thickness of the stainless steel sheet is 3~5mm, the width is 1000~2000mm, the tensile strength is >1035MPa, the yield strength is ≥760MPa, and the elongation is ≥6%.

3. The forming method of the large thin-walled stainless steel ring part according to claim 1, characterized in that, In the pre-processing step, the ring tooling is a steel mold, and the cross-sectional thickness of the ring tooling is 30~70mm.

4. The forming method of the large thin-walled stainless steel ring part according to claim 1, characterized in that, In the ring rolling process, the main roller linear speed is 0.8~1.2m / s, the radial rolling speed is 0.1~0.2mm / s, and the radial feed time is 15~30s.

5. The forming method of a large thin-walled stainless steel ring part according to claim 1, characterized in that, During the cutting and welding steps, after the stainless steel sheet is cut, the cut is polished and then welded. After welding is completed, the weld area is 0.5 to 1 mm higher than the main body.

6. The forming method of the large thin-walled stainless steel ring part according to claim 5, characterized in that, During the cutting and welding steps, the welding power is 6~12 kW and the welding speed is 0.8~1.5 m / min.

7. The forming method of a large thin-walled stainless steel ring part according to claim 1, characterized in that, During the local cold deformation step, the main roller feed speed of the ring rolling mill is 0.05~0.1mm / s, and reciprocating rolling is performed in the weld area for 3~5 times.

8. The forming method of the large thin-walled stainless steel ring part according to claim 5, characterized in that, The annealing treatment is carried out in a heating furnace at a heating temperature of 200~300℃ and a holding time of 3~6h.

9. A large thin-walled stainless steel ring, characterized in that, The large thin-walled stainless steel ring is prepared by the method according to any one of claims 1 to 8, and has a tensile strength of ≥870 MPa, a yield strength of ≥420 MPa, an elongation of ≥12.5%, and an out-of-roundness of ≤0.1%.

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