Ferritic stainless steel coils for bicycle rims and their manufacturing method

Abstract

This invention discloses a ferritic stainless steel coil for bicycle rims and its manufacturing method. The method includes: hot-rolled coil annealing and pickling, with an annealing temperature of 900℃≤T1≤1000℃ and an annealing time of 1.0~1.5min / mm; cold rolling in the first pass, with a rolling deformation rate of 70%~88%; continuous annealing of the cold-rolled coil, with an H2 dew point of -40℃~-60℃, a residual oxygen content of <5ppm, an annealing temperature of 900℃≤T2≤980℃, and an annealing time of 1.0~1.2min / mm; cold rolling in the second pass, with a rolling deformation rate of 10.0%~13.0%, and a first pass rolling deformation rate of 5.0%~6.5%; leveling, with a leveling elongation rate ≥0.10%, and the edge waviness of the coil controlled to ≤0.020mm. The ferritic stainless steel coil for bicycle rims produced by this invention can achieve a good match between rigidity and springback. Its properties, thickness, shape and roughness can meet the manufacturing process requirements of bicycle rims as well as the performance requirements of corrosion resistance, high springback, high load-bearing capacity and long service life.

Description

Technical Field

[0001] This invention belongs to the field of stainless steel manufacturing technology, and particularly relates to a ferritic stainless steel coil for bicycle rims and its manufacturing method. Background Technology

[0002] Compared to carbon steel bicycle rims produced using electroplating processes, stainless steel rims offer superior resistance to atmospheric corrosion, high strength, and a long fatigue life. Due to the inherent corrosion resistance of stainless steel, stainless steel rims do not suffer from plating peeling or localized rust after scratches, and they do not corrode even under cyclical rain and sun exposure, thus meeting the requirement of maintenance-free operation.

[0003] The manufacturing process of stainless steel bicycle rims typically involves slitting rolled steel sheets into strips, forming, cutting, flash resistance welding of the cross-sections, grinding of the weld seams, shaping, and polishing. Considering the actual operating conditions of bicycles, stainless steel rims not only need to meet rigidity requirements to prevent deformation under different loads, but also need to possess a certain degree of elasticity and high fatigue life. This places extremely high demands on the mechanical properties, thickness tolerances, and shape of the stainless steel rolled sheets used as raw materials for bicycle rims. Furthermore, to meet the requirement of easy polishing, the stainless steel rolled sheets used for bicycle rims also need to have a low surface roughness.

[0004] Therefore, after the stainless steel bicycle rims are manufactured, they also need to undergo tests such as compression resistance, springback, and fatigue life. Based on simulation studies of actual bicycle usage conditions, there are two important performance indicators for evaluating the quality of stainless steel rims before they leave the factory: one is the weld compression test, where a force of 0 to 2 kg is slowly applied to the weld; when the peak stress reaches 2 kg, the weld undergoes plastic deformation but does not crack; the other is the rim springback test, which provides feedback on the comprehensive performance of the weld and the base material. A force of 50 kg is applied to the rim, and the pressure is held for 2 minutes. After unloading, the deformation of the rim (Δd) is measured. The smaller this value, the better the elasticity of the rim; the upper limit is 0.8 mm. Typically, 100 rims are tested for each of the above tests. If any 5 rims fail to meet the requirements in any one test, the stainless steel coils used for the bicycle rims in that batch are considered unqualified.

[0005] In existing technologies, most methods improve the stiffness of bicycle rims by increasing the thickness and strength of ferritic stainless steel coils. However, simply increasing strength reduces the elasticity of the rim. Therefore, there is an urgent need to develop a manufacturing method for ferritic stainless steel coils used in bicycle rims, ensuring that the performance, thickness, shape, and roughness of the stainless steel coil meet the manufacturing process requirements of bicycle rims, as well as the performance requirements for corrosion resistance, high resilience, high load-bearing capacity, and long service life. Summary of the Invention

[0006] To address the technical problems existing in the prior art, the present invention provides a ferritic stainless steel coil for bicycle rims and a method for manufacturing the same.

[0007] In one aspect of the present invention, the method for manufacturing ferritic stainless steel coils for bicycle rims includes the following steps:

[0008] S10. Hot-rolled coil annealing and pickling: Ferritic stainless steel hot-rolled coil is annealed and pickled using a continuous annealing process. The annealing temperature T1 is controlled at 900℃≤T1≤1000℃, and the annealing time is controlled at 1.0~1.5min / mm.

[0009] S20, First-pass cold rolling: The annealed ferritic stainless steel hot-rolled coil is subjected to first-pass cold rolling. The rolling deformation rate of the first-pass cold rolling is controlled at 70% to 88%.

[0010] S30, continuous annealing of cold-rolled coil: The cold-rolled coil obtained after the first cold rolling process is continuously annealed using a bright annealing process. The H2 dew point is controlled at -40℃ to -60℃, the residual oxygen content is controlled at <5ppm, the annealing temperature T2 is controlled at 900℃≤T2≤980℃, and the annealing time is controlled at 1.0~1.2min / mm.

[0011] S40, Second-pass cold rolling: Ferritic stainless steel cold-rolled coils after continuous annealing are cold-rolled in two passes to produce ferritic stainless steel coils for bicycle rims. The rolling deformation rate of the second-pass cold rolling is controlled at 10.0% to 13.0%, and the rolling deformation rate of the first pass of the second-pass cold rolling is controlled at 5.0% to 6.5%.

[0012] S50, flattening: The ferritic stainless steel coils used for bicycle rims after the second cold rolling process are flattened to further adjust the shape of the plate. The flattening elongation is controlled to ≥0.10%, and the edge waviness of the coil is controlled to ≤0.020mm.

[0013] Furthermore, in the above-mentioned method for manufacturing ferritic stainless steel coils for bicycle rims, before step S10, a step of preparing hot-rolled ferritic stainless steel coils is included: using a converter → argon-oxygen decarburization furnace → ladle refining furnace → continuous casting process to prepare a continuously cast billet, which is then hot-rolled to obtain a hot-rolled ferritic stainless steel coil. In the chemical composition of the hot-rolled ferritic stainless steel coil, w(Cr) is controlled to be 16.0-19.0%, w(C+N) is controlled to be <0.030%, and w(Nb+Ti) / w(C+N) = 10.0-30.0.

[0014] Furthermore, in the above-mentioned method for manufacturing ferritic stainless steel coils for bicycle rims, a degreasing and cleaning step is included before step S50: the ferritic stainless steel coils for bicycle rims obtained after the second rolling cold rolling process are subjected to degreasing and cleaning treatment; and a longitudinal cutting step is included after step S50: the flattened ferritic stainless steel coils for bicycle rims are longitudinally cut according to the specifications of bicycle rims.

[0015] Furthermore, in the above-mentioned manufacturing method of ferritic stainless steel coil for bicycle rims, the thickness of the hot-rolled ferritic stainless steel coil is 2.8 to 5.0 mm, and the finished thickness of the ferritic stainless steel coil for bicycle rims is 0.55 to 0.70 mm.

[0016] In another aspect of the present invention, the provided ferritic stainless steel coil for bicycle rims is prepared by the above-described manufacturing method of the ferritic stainless steel coil for bicycle rims, and the properties of the ferritic stainless steel coil for bicycle rims are as follows: tensile strength ≤ 670 MPa, elongation ≤ 6.0% ≤ 3.0%, Vickers hardness 205~235, nominal thickness 0.55~0.70 mm, longitudinal roughness ≤ 0.60 mm, and inconsistency between coils ≤ 0.012 mm.

[0017] The ferritic stainless steel coil for bicycle rims and its manufacturing method of the present invention have at least the following beneficial effects:

[0018] This invention innovatively controls production process parameters such as hot-rolling annealing, cold rolling process, rolling reduction, bright annealing of cold-rolled coils, and leveling. The resulting ferritic stainless steel coils for bicycle rims meet all the requirements for ferritic stainless steel coils used in bicycle rims. Their properties are as follows: tensile strength ≤ 640MPa ≤ 670MPa, elongation ≤ 6.0% ≤ 3.0%, Vickers hardness 205~235, nominal thickness 0.55~0.70mm, longitudinal roughness ≤ 0.60mm, and inconsistency ≤ 0.012mm. Therefore, the ferritic stainless steel coils for bicycle rims manufactured using the method of this invention achieve a good balance of rigidity and springback. Their properties, thickness, shape, and roughness all meet the manufacturing process requirements for bicycle rims, as well as the performance requirements for corrosion resistance, high springback, high load-bearing capacity, and long service life. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0020] Figure 1 This is a schematic flowchart of the manufacturing method of the ferritic stainless steel coil for bicycle rims according to the present invention.

[0021] Figure 2 A cross-sectional macroscopic morphology of a bicycle rim manufactured using a ferritic stainless steel coil prepared by the manufacturing method of the present invention.

[0022] Figure 3 Metallographic diagram of the ferritic stainless steel coil prepared by the manufacturing method of the ferritic stainless steel coil for bicycle rims of the present invention.

[0023] Figure 4 The image shows the metallographic structure of the weld seam of a bicycle rim manufactured using a ferritic stainless steel coil prepared by the manufacturing method of the present invention. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0025] Based on the manufacturing process and performance requirements of bicycle rims, this invention designs the performance and thickness of ferritic stainless steel coils for bicycle rims. Furthermore, to achieve the aforementioned performance indicators and thickness requirements for the ferritic stainless steel coils used in bicycle rims, this invention also innovatively controls production process parameters such as hot-rolling annealing, cold rolling process, rolling reduction, bright annealing of cold-rolled coils, and leveling. Specifically, as... Figure 1 As shown, the manufacturing method of the ferritic stainless steel coil for bicycle rims of the present invention includes the following steps S10 to S50:

[0026] S10. Hot-rolled coil annealing and pickling: Ferritic stainless steel hot-rolled coil is annealed and pickled using a continuous annealing process. The annealing temperature T1 is controlled at 900℃≤T1≤1000℃, and the annealing time is controlled at 1.0~1.5min / mm.

[0027] S20, First-pass cold rolling: The annealed ferritic stainless steel hot-rolled coil is subjected to first-pass cold rolling. The rolling deformation rate of the first-pass cold rolling is controlled at 70% to 88%.

[0028] S30, continuous annealing of cold-rolled coil: The cold-rolled coil obtained after the first cold rolling process is continuously annealed using a bright annealing process. The H2 dew point is controlled at -40℃ to -60℃, the residual oxygen content is controlled at <5ppm, the annealing temperature T2 is controlled at 900℃≤T2≤980℃, and the annealing time is controlled at 1.0~1.2min / mm.

[0029] S40, Second-pass cold rolling: Ferritic stainless steel cold-rolled coils after continuous annealing are cold-rolled in two passes to produce ferritic stainless steel coils for bicycle rims. The rolling deformation rate of the second-pass cold rolling is controlled at 10.0% to 13.0%, and the rolling deformation rate of the first pass of the second-pass cold rolling is controlled at 5.0% to 6.5%.

[0030] S50, leveling: The ferritic stainless steel coils used for bicycle rims after the second cold rolling process are leveled to further adjust the shape of the plate. The leveling elongation is controlled to ≥0.10%, and the edge waviness of the coil is controlled to ≤0.020mm.

[0031] In the manufacturing method of the ferritic stainless steel coil for bicycle rims of the present invention, hot-rolled ferritic stainless steel coil is used as the raw material, and is subsequently cold-rolled in a double-pass process to obtain the ferritic stainless steel coil for manufacturing bicycle rims. For conventional 22-28 inch bicycle rims, in order to meet the stiffness requirements, the nominal thickness of the coil is controlled at a lower limit of 0.55 mm. Increasing the thickness increases the weight of the bicycle. Therefore, under the premise of meeting the performance requirements of the rim, the nominal thickness of the coil is controlled at an upper limit of 0.70 mm. That is, the finished thickness of the ferritic stainless steel coil used to manufacture bicycle rims is determined to be 0.55-0.70 mm. Accordingly, in the manufacturing method of the ferritic stainless steel coil for bicycle rims of the present invention, the thickness of the ferritic stainless steel hot-rolled coil as the raw material is selected to be 2.8 to 5.0 mm. By using a continuous annealing process with process parameters of 900℃≤annealing temperature T1≤1000℃ and annealing time 1.0 to 1.5 min / mm, the ferritic stainless steel hot-rolled coil can be completely recrystallized after annealing, and the Brinell hardness value of the ferritic stainless steel hot-rolled coil can be controlled at 120 to 150.

[0032] In the manufacturing method of ferritic stainless steel coil for bicycle rims of the present invention, the rolling adopts a double-pass cold rolling process. Due to the large deformation of single-pass rolling, the finished product performance exceeds the control range of coil performance, and the difference between the same plate and the coil shape are not easy to control. Therefore, two-pass rolling is adopted. The deformation rate of the first-pass cold rolling is controlled at 70-88%, thereby rolling the ferritic stainless steel hot-rolled coil, which is the raw material, from a thickness of 2.8-5.0 mm to a thickness of 0.60-0.90 mm.

[0033] During the bright annealing process of the cold-rolled coil after the first cold rolling pass, if the bright annealing temperature is too high or the time is too long, grain growth is likely to occur, resulting in orange peel defects on the surface of the coil when bending and rolling, increasing the difficulty of polishing. If the bright annealing temperature is too low or the time is too short, the grains will not be fully recrystallized, resulting in higher strength and hardness. After subsequent cold rolling in the second rolling pass, the finished coil will not meet the corresponding mechanical property requirements. Therefore, in the manufacturing method of ferritic stainless steel coil for bicycle rims of the present invention, by using a bright annealing process with process parameters of 900℃≤annealing temperature T2≤980℃ and annealing time of 1.0~1.2min / mm to continuously anneal the cold-rolled coil after the first cold rolling pass, the Brinell hardness value of the ferritic stainless steel cold-rolled coil can be controlled at 130~150.

[0034] In the second cold rolling pass, which serves as the final product rolling process, the shape control during a single pass is often poor. Therefore, in the manufacturing method of the ferritic stainless steel coil for bicycle rims of this invention, the second cold rolling pass employs a two-pass rolling process. Furthermore, if the pass deformation rate is too small, the rolls are prone to slippage during rolling, affecting the surface quality of the cold-rolled sheet; if the pass deformation rate is too large, the finished product thickness cannot be precisely controlled. Therefore, in the manufacturing method of the ferritic stainless steel coil for bicycle rims of this invention, the deformation rate of the first pass in the second cold rolling pass is controlled at 5.0–6.5%, and the total deformation rate of the two passes in the second cold rolling pass is controlled at 10.0–13.0%. This allows for control of the mechanical properties, sheet thickness variation, and shape of the final finished coil.

[0035] The manufacturing method of ferritic stainless steel coils for bicycle rims according to the present invention achieves the following properties through innovative control of production process parameters such as hot rolling annealing, cold rolling process, rolling reduction, bright annealing of cold-rolled coils, and leveling: 640MPa≤Tensile strength≤670MPa, 3.0%≤Elongation≤6.0%, Vickers hardness 205~235, nominal thickness 0.55~0.70mm, longitudinal roughness ≤0.60mm, and inconsistency between coils ≤0.012mm. Therefore, the ferritic stainless steel coils for bicycle rims manufactured using the method of the present invention achieve a good balance of rigidity and springback, meeting the rigidity, performance, and polishing requirements of bicycle rims.

[0036] Furthermore, in the manufacturing method of the ferritic stainless steel coil for bicycle rims of the present invention, before step S10, a step of preparing ferritic stainless steel hot-rolled coil may be included: using a converter → argon-oxygen decarburization furnace → ladle refining furnace → continuous casting process to prepare a continuously cast billet, and then hot-rolling it to obtain a ferritic stainless steel hot-rolled coil, wherein the chemical composition of the ferritic stainless steel hot-rolled coil is controlled as follows: w(Cr) is controlled to be 16.0-19.0%, w(C+N) is controlled to be <0.030%, and w(Nb+Ti) / w(C+N) = 10.0-30.0. Excessive C and N content, or the absence of Nb and Ti elements, can easily lead to the precipitation of chromium carbide in the weld heat-affected zone during the welding cooling process in subsequent processing and manufacturing of bicycle rims, thus deteriorating the corrosion resistance of ferritic stainless steel coils. When the Cr content is controlled between 16.0% and 19.0%, it has universal corrosion resistance and can meet the weather resistance requirements of stainless steel rims in different climates, such as inland and coastal areas.

[0037] Furthermore, in the manufacturing method of the ferritic stainless steel coil for bicycle rims of the present invention, a degreasing and cleaning step may be included before step S50: the ferritic stainless steel coil for bicycle rims obtained after the second rolling cold rolling process is subjected to degreasing and cleaning treatment; and a longitudinal cutting step may be included after step S50: the flattened ferritic stainless steel coil for bicycle rims is longitudinally cut according to the specifications of the bicycle rim.

[0038] The manufacturing method of ferritic stainless steel coil for bicycle rims of the present invention will be further described below with reference to Examples 1 to 5 and Comparative Examples 6 to 8.

[0039] Examples 1-5 and Comparative Examples 6-8 all used a converter → argon-oxygen decarburization furnace → ladle refining furnace → continuous casting process to obtain a 200mm thick continuously cast billet, which was then hot-rolled to obtain a 2.8-5.0mm thick stainless steel hot-rolled coil. Then, the stainless steel hot-rolled coil was processed according to the following steps: hot-rolled coil annealing and pickling → first-pass cold rolling → cold-rolled coil continuous annealing → second-pass cold rolling → degreasing and cleaning → leveling → slitting to obtain a ferritic stainless steel coil for bicycle rims. The chemical composition of the ferritic stainless steel coil by weight percentage is: C: 0.008%, N: 0.007%, Si: 0.18%, Mn: 0.20%, Cr: 17.3%, Ni: 0.21%, (Nb+Ti) / (C+N) = 20.6, P: 0.0020%, S: 0.0010%, with the remainder being Fe and unavoidable impurities.

[0040] See the macroscopic morphology diagram of the cross-section of the bicycle rim manufactured using the ferritic stainless steel coil prepared according to the embodiments of the present invention. Figure 2 The metallographic structure of the ferritic stainless steel coil prepared according to the embodiments of the present invention is shown in the figure. Figure 3 The metallographic structure of the weld seam of a bicycle rim manufactured using the ferritic stainless steel coil prepared according to the embodiments of the present invention is shown in the figure. Figure 4 .

[0041] Table 1 below lists the main process parameters in the manufacturing processes of Examples 1-5 and Comparative Examples 6-8:

[0042] Table 1

[0043]

[0044] The following actual tests and experiments were conducted on the ferritic stainless steel coils prepared in Examples 1-5 and Comparative Examples 6-8:

[0045] In accordance with GB / T 228.1 "Metallic materials - Tensile testing - Part 1: Test at room temperature", the longitudinal tensile strength and elongation of ferritic stainless steel coils were measured using an electronic tensile testing machine.

[0046] According to GB / T 231.1 "Metallic materials - Brinell hardness test - Part 1: Test method" and GB / T 4340.1 "Metallic materials - Vickers hardness test - Part 1: Test method", the hardness of ferritic stainless steel coils was measured using Brinell and Vickers hardness testers, respectively.

[0047] The longitudinal roughness of ferritic stainless steel coils was measured using a roughness tester.

[0048] The edge wave of ferritic stainless steel coils is measured according to the formula: edge wave = wave height / wave shape length.

[0049] Take steel plate samples with original width × 100mm length from the head, middle and tail of the ferritic stainless steel coil, and measure the thickness on both sides (100mm from the edge) and in the middle of the steel plate sample. The difference between the maximum and minimum values ​​is taken as the thickness difference of the same plate.

[0050] Table 2 below lists the actual tested coil thickness, plate-to-plate difference, and various mechanical properties of the ferritic stainless steel coils prepared in Examples 1-5 and Comparative Examples 6-8, as well as the evaluation results of bicycle rims manufactured using the ferritic stainless steel coils prepared in Examples 1-5 and Comparative Examples 6-8.

[0051] Table 2

[0052]

[0053] As can be seen from Tables 1 and 2, the ferritic stainless steel coils manufactured using the manufacturing method for bicycle rims provided in this application meet the requirements of bicycle rims for material properties, plate variation, plate shape, and edge waviness, resulting in qualified evaluation indicators for the manufactured stainless steel bicycle rims. While the tensile strength, elongation, and hardness values ​​of the ferritic stainless steel coil in Comparative Example 6 meet the mechanical property requirements for ferritic stainless steel coils used in bicycle rims, the plate variation is unqualified, and the weld seam compression test and springback test of the manufactured stainless steel rim do not meet the standard requirements. In Comparative Example 7, due to the rolling deformation rate exceeding 10% to 13.0% in the double-pass cold rolling process, although the strength of the ferritic stainless steel coil increases, the elongation decreases significantly, resulting in greater brittleness of the ferritic stainless steel coil. Consequently, the weld seam compression test and springback test of the manufactured stainless steel rim do not meet the standard requirements. Comparative Example 8: Due to the rolling deformation rate of the double-pass cold rolling process being less than 10% to 13.0%, the ferritic stainless steel coil is relatively soft, with low tensile strength and hardness, and high surface roughness. The stainless steel rings manufactured from this process have large deformation in the springback test and are difficult to polish.

[0054] In summary, the manufacturing method of the ferritic stainless steel coil for bicycle rims of the present invention innovatively controls the production process parameters such as hot rolling annealing, cold rolling process, rolling reduction, bright annealing of cold rolled coil, and leveling. The resulting ferritic stainless steel coil for bicycle rims meets the requirements for ferritic stainless steel coils for bicycle rims, and its properties are as follows: tensile strength ≤ 670 MPa, elongation ≤ 6.0% (3.0%), Vickers hardness 205-235, nominal thickness 0.55-0.70 mm, longitudinal roughness ≤ 0.60 mm, and inconsistency between coil sections ≤ 0.012 mm. Therefore, the ferritic stainless steel coil for bicycle rims produced by the manufacturing method of the present invention can achieve a good match between the stiffness and springback of the coil. Its performance, thickness, shape and roughness can meet the manufacturing process requirements of bicycle rims as well as the performance requirements of corrosion resistance, high springback, high load-bearing capacity and long service life.

[0055] It should be noted that, in this document, relational terms such as “first” and “second” are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method of manufacturing a ferritic stainless steel coil sheet for a bicycle rim, characterized by, The method comprises the following steps: S10, annealing and pickling of hot-rolled coil, adopting a continuous annealing process to anneal and pickle the ferritic stainless steel hot-rolled coil, the annealing temperature T1 is controlled to be 900℃≤T1≤1000℃, and the annealing time is controlled to be 1.0~1.5min / mm; S20, first-pass cold rolling, first-pass cold rolling is performed on the ferritic stainless steel hot-rolled coil after annealing, and the rolling deformation rate of the first-pass cold rolling is controlled to be 70%~88%; S30, continuous annealing of cold-rolled coil, adopting a bright annealing process to perform continuous annealing treatment on the cold-rolled coil obtained after the first-pass cold rolling, wherein the H2 dew point is controlled to be -40℃~-60℃, the residual oxygen content is controlled to be <5ppm, the annealing temperature T2 is controlled to be 900℃≤T2≤980℃, and the annealing time is controlled to be 1.0~1.2min / mm; S40, second-pass cold rolling, adopting two passes to perform second-pass cold rolling on the ferritic stainless steel cold-rolled coil after continuous annealing, to obtain the ferritic stainless steel coil for bicycle rims, the rolling deformation rate of the second-pass cold rolling is controlled to be 10.0%~13.0%, and the rolling deformation rate of the first pass of the second-pass cold rolling is controlled to be 5.0%~6.5%; S50, skin pass, performing skin pass treatment on the ferritic stainless steel coil for bicycle rims obtained after the second-pass cold rolling, to further adjust the plate shape, and the skin pass elongation is controlled to be ≥0.10%, and the coil edge wave is controlled to be ≤0.020mm, In the chemical composition of the ferritic stainless steel hot-rolled coil, w (Cr) is controlled to be 16.0-19.0%, w (C+N) is controlled to be <0.030%, and w (Nb+Ti) / w (C+N)=10.0-30.

0.

2. The method of manufacturing a ferritic stainless steel coil sheet for a bicycle rim according to claim 1, characterized by, Before step S10, there is also a step of preparing the ferritic stainless steel hot-rolled coil: adopting a converter→argon-oxygen decarburization furnace→ladle refining furnace→continuous casting process to prepare a continuous casting billet, and then performing hot continuous rolling to obtain the ferritic stainless steel hot-rolled coil.

3. The method of producing a ferritic stainless steel sheet for a bicycle rim according to claim 1, characterized in that, Before step S50, there is also a step of degreasing and cleaning: performing degreasing and cleaning treatment on the ferritic stainless steel coil for bicycle rims obtained after the second-pass cold rolling; And after step S50, there is also a step of longitudinal cutting: longitudinally cutting the ferritic stainless steel coil for bicycle rims after skin pass according to the specifications of the bicycle rims.

4. The method of producing a ferritic stainless steel sheet for a bicycle rim according to claim 1, characterized in that, The thickness of the ferritic stainless steel hot-rolled coil is 2.8~5.0mm, and the finished product thickness of the ferritic stainless steel coil for bicycle rims is 0.55~0.70mm.

5. A ferritic stainless steel coil sheet for a bicycle rim, characterized by, The ferritic stainless steel coil for bicycle rims prepared by the manufacturing method according to any one of claims 1 to 4 has the following properties: 640MPa≤tensile strength≤670MPa, 3.0%≤elongation≤6.0%, Vickers hardness value 205~235, nominal thickness 0.55~0.70mm, coil longitudinal roughness≤0.60mm, and coil same plate difference≤0.012mm.

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