Titanium strip for deep drawing and method of making the same

Abstract

The application provides a titanium strip coil for deep drawing and a preparation method thereof. The preparation method of the titanium strip coil for deep drawing comprises the following steps: providing a titanium strip coil raw material; applying lubricating oil on the titanium strip coil raw material to perform a finished product rolling treatment, wherein the pressure applied by a doctor roll on the titanium strip coil raw material is controlled to be 1.8 MPa-2.2 MPa during the finished product rolling treatment, and a strip coil with oil is obtained; the residual oil amount of the lubricating oil on the strip coil with oil is 500 mg / m 2 ·face 800 mg / m 2 ·face; and performing an annealing treatment on the strip coil with oil to prepare the titanium strip coil for deep drawing. The preparation method of the titanium strip coil for deep drawing can make the oil film uniformly and stably cover the surface of the titanium strip coil by reducing the pressure of the doctor roll in the finished product rolling process to a specific range; in this way, the deformation, cooling and heating can be more uniform, so that a smoother and flatter surface can be obtained, and the mechanical properties and tensile deformation properties of the titanium strip coil are improved.

Description

Technical Field

[0001] This application relates to the field of titanium materials technology, and in particular to titanium strip coils for deep drawing and their preparation methods. Background Technology

[0002] Deep-drawing titanium strip coils are titanium alloy strips with high plasticity, uniform microstructure, and excellent surface quality, and are widely used in nuclear power plate heat exchangers, aerospace, and high-end chemical industries. In these applications, excellent mechanical and tensile properties are typically required. Traditional manufacturing methods are effective in improving the performance of deep-drawing titanium strip coils, and therefore require further improvement. Summary of the Invention

[0003] Based on this, one or more embodiments of this application provide a deep-drawing titanium strip coil with excellent mechanical and tensile properties and a method for preparing the same.

[0004] According to a first aspect of the embodiments of this application, a method for preparing titanium strip coils for deep drawing is provided, comprising the following steps: Provide titanium strip coil raw materials; Lubricating oil is applied to the titanium strip coil raw material for finished product rolling. During the finished product rolling process, the pressure applied to the titanium strip coil raw material by the oil scraper is controlled at 1.8MPa~2.2MPa to obtain oiled coil material; the residual lubricating oil content on the oiled coil material is 500mg / m. 2 · 800mg / m 2 ·noodle; The oil-coated coil is annealed to prepare titanium strip coils for deep drawing.

[0005] In some embodiments, the total deformation of the finished product rolling process is 60% to 85%; and / or, The finished product rolling process consists of 10 to 20 passes; and / or, The temperature for the finished product rolling process is 20℃~25℃.

[0006] In some embodiments, the finished product rolling process includes a first finished product rolling process and a second finished product rolling process performed sequentially; The surface roughness of the rolls used in the first finished product rolling process is Ra 0.4μm~0.5μm, and the surface roughness of the rolls used in the second finished product rolling process is Ra 0.25μm~0.35μm.

[0007] In some embodiments, the second finished product rolling process is performed in 3 passes.

[0008] In some embodiments, the thickness reduction of the second finished product rolling process is 0.2 mm to 0.8 mm.

[0009] In some embodiments, the rolling speed of the finished product rolling process is 80m / min to 100m / min.

[0010] In some embodiments, the impurity elements in the titanium strip coil raw material, by mass percentage, include: Fe 0.01%~0.04%, C≤0.08%, O 0.04%~0.07%, N≤0.03% and H≤0.008wt%.

[0011] In some embodiments, the annealing treatment is performed at a temperature of 600°C to 700°C for a time of 3 min to 20 min.

[0012] In some embodiments, after the annealing process, a degreasing process is further included for the deep-drawing titanium strip coil.

[0013] According to a second aspect of the embodiments of this application, a deep-drawing titanium strip coil is provided, which is prepared by the above-described method for preparing a deep-drawing titanium strip coil.

[0014] Compared with traditional technologies, this application has the following advantages: The method for preparing deep-drawing titanium strip coils disclosed in this application reduces the pressure of the oil scraper rollers during the finished product rolling process to a specific range, thereby enabling the rolled oil film to uniformly and stably cover the surface of the titanium strip coil. This allows for more uniform rolling deformation and annealing heating, resulting in a smoother and flatter surface, and improving the mechanical properties and tensile deformation properties of the titanium strip coil. Detailed Implementation

[0015] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, a detailed description of specific embodiments of this application is provided. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise specifically stated, all raw materials, reagents, instruments, and equipment used in this application are commercially available or can be prepared by existing methods.

[0017] The terms "and / or," "or / and," and "and / or" as used herein include any one of two or more of the related listed items, as well as any and all combinations of the related listed items. These arbitrary and all combinations include any two related listed items, any more related listed items, or a combination of all related listed items. It should be noted that when at least three items are connected using at least two conjunctions selected from "and / or," "or / and," and "and / or," it should be understood that in this application, the technical solution undoubtedly includes technical solutions connected by "logical AND," and also undoubtedly includes technical solutions connected by "logical OR." For example, "A and / or B" includes three parallel solutions: A, B, and A+B. For example, the technical solution of "A, and / or, B, and / or, C, and / or, D" includes any one of A, B, C, and D (that is, a technical solution that is connected by "logical OR"), as well as any and all combinations of A, B, C, and D, that is, combinations of any two or three of A, B, C, and D, and also combinations of all four of A, B, C, and D (that is, a technical solution that is connected by "logical AND").

[0018] In this application, the terms "multiple", "various", "multiple times", "multi-dimensional", etc., unless otherwise specified, refer to a quantity greater than or equal to 2. For example, "one or more" means one or more than or equal to two.

[0019] The terms “combinations of,” “any combination of,” and “any combination of” used in this article include all suitable combinations of any two or more of the listed items.

[0020] In this document, the term "suitable" as used in phrases such as "suitable combination," "suitable method," and "any suitable method" refers to the ability to implement the technical solution of this application, solve the technical problem of this application, and achieve the expected technical effect of this application.

[0021] In this document, terms such as “preferred,” “better,” “more suitable,” and “ideal” are merely used to describe implementation methods or examples that achieve better results, and should be understood not to limit the scope of protection of this application.

[0022] In this application, terms such as "further," "even more," and "particularly" are used to describe purposes and indicate differences in content, but should not be construed as limiting the scope of protection of this application.

[0023] In this application, the technical features described in an open-ended manner include both closed technical solutions consisting of the listed features and open technical solutions that include the listed features.

[0024] In this application, numerical intervals (i.e., numerical ranges) are involved. Unless otherwise specified, the selected numerical distributions within the aforementioned numerical intervals are considered continuous and include the two endpoints (i.e., the minimum and maximum values) of the numerical range, as well as every value between these two endpoints. Unless otherwise specified, when a numerical interval refers only to integers within that interval, it includes the two endpoint integers of the numerical range, as well as every integer between the two endpoints. In this document, this is equivalent to directly listing every integer. For example, if t is an integer selected from 1 to 10, it means that t is any integer selected from the group of integers consisting of 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10. Furthermore, when multiple ranges are provided to describe features or characteristics, these ranges can be merged. In other words, unless otherwise specified, the ranges disclosed herein should be understood to include any and all subranges to which they are included.

[0025] Unless otherwise specified, the temperature parameters in this application are permitted to be either constant-temperature treatment or variations within a certain temperature range. It should be understood that the constant-temperature treatment allows temperature fluctuations within the precision range of the instrument control, such as ±5℃, ±4℃, ±3℃, ±2℃, or ±1℃.

[0026] In this application, %(w / w) and wt% both represent weight percentage, %(v / v) refers to volume percentage, and %(w / v) refers to mass-volume percentage.

[0027] Some embodiments of this application provide a method for preparing titanium strip coils for deep drawing, comprising the following steps: Provide titanium strip coil raw materials; Lubricating oil is applied to titanium strip coil raw material for finished product rolling. During the finished product rolling process, the pressure applied to the titanium strip coil raw material by the oil scraper is controlled at 1.8MPa~2.2MPa to obtain oiled coil material; the residual lubricating oil content on the oiled coil material is 500mg / m. 2 · 800mg / m 2 ·noodle; The oil-coated roll material is annealed.

[0028] Understandably, during the finished product rolling process, oil scraper rollers are installed on both the inlet and outlet sides of the rolling mill; and the pressure applied to the titanium strip coil raw material by the oil scraper rollers on the inlet and outlet sides can each be any value between 1.8MPa and 2.2MPa. Furthermore, there are 1 to 2 sets of oil scraper rollers on each side.

[0029] The method for preparing deep-drawing titanium strip coils disclosed in this application reduces the pressure of the oil scraper rollers during the finished product rolling process to a specific range, thereby enabling the rolled oil film to uniformly and stably cover the surface of the coil. This allows for more uniform deformation, cooling, and heating, resulting in a smoother and flatter surface, and improving the mechanical properties and tensile deformation properties of the titanium strip coil.

[0030] During the rolling process of titanium strip coils, scraper rollers are typically positioned on the inlet and outlet sides of the rolling mill, and these rollers are in close contact with the surface of the titanium strip to ensure complete coverage of its full width. The scraper roller on the inlet side removes the rolling oil sprayed onto the titanium strip surface to a uniform and suitable thickness. The scraper rollers on both the inlet and outlet sides effectively clean the lubricating oil from the coil surface and also seal the lubricating oil within the rolling mill stand.

[0031] As an example, the pressure of the scraper roller during the finished product rolling process can be 1.8MPa, 1.9MPa, 2MPa, 2.1MPa, 2.2MPa, or any value within the range formed by any two of the above points.

[0032] Furthermore, the pressure of the oil scraper roller during the finished product rolling process is 1.9 MPa to 2.1 MPa. Even further, the pressure of the oil scraper roller during the finished product rolling process is 2 MPa.

[0033] In traditional technology, the pressure of the scraper rollers during finished product rolling is usually 3 MPa or even higher, which can cause scratches on the surface of the coil and form minor surface defects. Moreover, excessive pressure on the scraper rollers may cause changes in the transverse tension of the coil, thereby reducing the stability of the rolling process.

[0034] In some embodiments, the impurity elements in the titanium strip coil raw material, by mass percentage, include: Fe 0.01%~0.04%, C≤0.08%, O 0.04%~0.07%, N≤0.03% and H≤0.008wt%.

[0035] As an example, the mass percentage of Fe in the titanium strip coil raw material can be 0.01%, 0.02%, 0.03%, 0.04%, or any value within the range formed by any two of the above points.

[0036] Fe can replace solid solutions, which can hinder grain growth and thus refine the grains. It can also improve the strength of deep-drawing titanium coils.

[0037] As an example, the mass percentage of C in the titanium strip coil raw material can be 0, 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, or any value within the range formed by any two of the above points.

[0038] As an example, the mass percentage of O in the titanium strip coil raw material can be 0.04%, 0.05%, 0.06%, 0.07%, or any value within the range formed by any two of the above points.

[0039] O element acts as an interstitial solid solution, which can reduce the plasticity of titanium coils used for deep drawing.

[0040] As an example, the mass percentage of N in the titanium strip coil raw material can be 0, 0.01%, 0.02%, 0.03%, or any value within the range of any two of the above points.

[0041] As an example, the mass percentage of H in the titanium strip coil raw material can be 0, 0.001%, 0.002%, 0.003%, 0.004%, 0.005%, 0.006%, 0.007%, 0.008%, or any value within the range formed by any two of the above points.

[0042] In some embodiments, the impurity elements in the titanium strip coil raw material, by mass percentage, include: Fe 0.013%, C 0.011%, O 0.042%, N 0.003%, and H 0.008wt%.

[0043] In some specific embodiments, the titanium strip coil raw material may also contain other impurity elements, and the mass percentage of any one of the other impurity elements is ≤0.1%. Further, the sum of the mass percentages of the other impurity elements is ≤0.4%.

[0044] It should be noted that the mass percentage of impurity elements in this application is calculated based on the total mass of the titanium strip coil raw material.

[0045] Understandably, controlling the Fe content within the aforementioned specific range is beneficial for controlling the purity of sponge titanium and can reduce abnormal grain growth caused by heat-driven processes during heat treatment due to excessive Fe content. Controlling the interstitial element O content within the aforementioned range can effectively improve the plasticity of the titanium strip coil raw material while ensuring sufficient original strength.

[0046] In some embodiments, the total deformation during the finished product rolling process is 60% to 85%.

[0047] As an example, the total deformation during the finished product rolling process can be 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, or any value within the range formed by any two of the above points.

[0048] In some embodiments, the finished product rolling process takes 10 to 20 passes.

[0049] As an example, the number of passes in the finished product rolling process can be 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20, or any value within the range formed by any two of the above point values.

[0050] In some embodiments, the finished product rolling process is a cold rolling process.

[0051] In some embodiments, the temperature for the finished product rolling process is 20°C to 25°C.

[0052] In some embodiments, the temperature for rolling the finished product is room temperature.

[0053] In some embodiments, the surface roughness of the titanium strip coil obtained after finished product rolling can reach 0.4μm~0.5μm.

[0054] In some embodiments, the finished product rolling process includes a first finished product rolling process and a second finished product rolling process performed sequentially. The roll roughness for the first finished product rolling process is Ra 0.4μm~0.5μm, and the roll roughness for the second finished product rolling process is Ra 0.25μm~0.35μm.

[0055] As an example, the surface roughness of the rolls used in the first finished product rolling process can be Ra 0.4μm, Ra 0.41μm, Ra 0.42μm, Ra 0.43μm, Ra 0.44μm, Ra 0.45μm, Ra 0.46μm, Ra 0.47μm, Ra 0.48μm, Ra 0.49μm, Ra 0.5μm, or any value within the range formed by any two of the above values.

[0056] As an example, the surface roughness of the rolls used in the second finished product rolling process can be Ra 0.25μm, Ra 0.26μm, Ra 0.27μm, Ra 0.28μm, Ra 0.29μm, Ra 0.30μm, Ra 0.31μm, Ra 0.32μm, Ra 0.33μm, Ra 0.34μm, Ra 0.35μm, or any value within the range formed by any two of the above values.

[0057] In some embodiments, the second finished product rolling process is performed in 3 passes.

[0058] It is understandable that by controlling the roughness of the rolls in the first and second finished product rolling processes to be within the aforementioned ranges, and by replacing the rolls in the second finished product rolling process to adjust their roughness, the surface roughness of the titanium strip coil raw material when it comes off the production line can be improved, further enhancing the ability of the coil surface to carry and retain oil, increasing the oxide film thickness, and thus optimizing the lubrication conditions for subsequent processing.

[0059] In some embodiments, the thickness reduction during the second finished product rolling process is 0.2 mm to 0.8 mm.

[0060] As an example, the thickness reduction during the second finished product rolling process can be 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, or 0.8 mm, or any value within the range formed by any two of the above points.

[0061] In some embodiments, the rolling speed for the finished product rolling process is 80 m / min to 100 m / min.

[0062] As an example, the rolling speed for finished product rolling can be 80 m / min, 81 m / min, 82 m / min, 83 m / min, 84 m / min, 85 m / min, 86 m / min, 87 m / min, 88 m / min, 89 m / min, 90 m / min, 91 m / min, 92 m / min, 93 m / min, 94 m / min, 95 m / min, 96 m / min, 97 m / min, 98 m / min, 99 m / min, 100 m / min, or any value within the range formed by any two of the above points.

[0063] Furthermore, the rolling speed for the finished product rolling process is 90 m / min to 100 m / min. Even further, the rolling speed for the finished product rolling process is 100 m / min.

[0064] By controlling the force-speed coupling of the oil scraper roller pressure and the rolling speed, and by systematically adjusting the oil scraper roller cylinder, the rolling oil film can be uniformly and stably attached to the surface of the titanium strip coil. This ensures that the titanium strip coil is subjected to uniform stress, heat and cooling during rolling and annealing, thereby improving the deep drawing performance of the titanium strip coil.

[0065] In some embodiments, the above-described preparation method of this application does not require degreasing after rolling and before annealing; this allows for control of the oxide layer thickness, which in turn improves lubrication conditions and enhances the uniformity of the titanium strip coil's performance. In conventional techniques, if the coil is rolled directly without degreasing, an oxide layer may form on the surface of the coil, affecting its performance.

[0066] In some embodiments, the annealing temperature is 600°C to 700°C and the time is 3 min to 20 min.

[0067] As an example, the annealing temperature can be 600℃, 605℃, 610℃, 615℃, 620℃, 625℃, 630℃, 635℃, 640℃, 645℃, 650℃, 655℃, 660℃, 665℃, 670℃, 675℃, 680℃, 685℃, 690℃, 695℃, 700℃, or any value within the range formed by any two of the above points.

[0068] Furthermore, the annealing temperature is 650℃~700℃; even further, the annealing temperature is 700℃.

[0069] As an example, the annealing time can be 3 min, 4 min, 5 min, 6 min, 7 min, 8 min, 9 min, 10 min, 11 min, 12 min, 13 min, 14 min, 15 min, 16 min, 17 min, 18 min, 19 min, 20 min, or any value within the range formed by any two of the above point values.

[0070] Furthermore, the annealing time is 10 min to 20 min; even further, the annealing time is 20 min.

[0071] In some embodiments, the annealing process is performed under air medium conditions.

[0072] It is understandable that the annealing process at the specific temperature described above can result in fine core grains, good strength and toughness, and excellent uniformity in titanium strip raw materials with specific elemental compositions. Simultaneously, the high temperature promotes the formation of a hardened lubricating layer on the strip surface, thereby improving the mechanical strength and tensile properties of the strip.

[0073] In some embodiments, after annealing, a step of degreasing the deep-drawing titanium strip coil is also included.

[0074] In some embodiments, the degreasing treatment uses an alkaline degreasing solution.

[0075] In some embodiments, the alkaline degreasing solution includes one or more of sodium hydroxide solution and potassium hydroxide solution.

[0076] In some embodiments, the alkaline degreasing solution also includes a compound additive. Further, the compound additive includes a surfactant.

[0077] Understandably, degreasing can effectively remove dirt from the surface of titanium strip coils and improve surface quality.

[0078] In some embodiments, after degreasing, a step of fixing the width of the deep-drawing titanium coil is also included.

[0079] Some embodiments of this application also provide a deep-drawing titanium strip coil, which is prepared using the above-described method for preparing deep-drawing titanium strip coils.

[0080] The titanium coils for deep drawing prepared by the above method have excellent tensile strength, yield strength and elongation at break, and good deep drawing performance.

[0081] The present application will be further described below with reference to specific embodiments and comparative examples, but these should not be construed as limiting the scope of protection of the present application. Unless otherwise specified, the raw materials involved in the following specific embodiments are all commercially available, the instruments used are all commercially available, and the processes involved are conventionally selected by those skilled in the art unless otherwise specified.

[0082] Example 1 (1) Titanium strip coil raw material is prepared by using sponge titanium as raw material. The titanium strip coil raw material obtained by hot rolling and / or cold rolling and annealing contains the following impurity elements: F 0.013wt%, C 0.011wt%, O 0.042wt%, N 0.003wt%, H 0.0008wt%.

[0083] (2) The above-mentioned titanium strip coil raw material is subjected to finished product cold rolling treatment to roll the titanium strip coil raw material with a thickness of 1.5 mm into titanium strip with a thickness of 0.5 mm; wherein, the temperature of finished product rolling treatment is room temperature; the roughness of the roll of the first finished product rolling treatment is Ra. 0.45 μm, and the number of passes is 7; the roughness of the roll of the second finished product rolling treatment is Ra. 0.3 μm, and the number of passes is 3; the rolling speed is 100 m / min, and the pressure of the scraper roll is 2 MPa.

[0084] (3) At 700℃, the residual oil content is 600 mg / m 2 The titanium strip is annealed and held at that temperature for 20 minutes; the width is then fixed to obtain a titanium strip coil for deep drawing.

[0085] Example 2 The method is basically the same as that in Example 1, except that the content of impurity elements in step (1) and the pressure of the oil scraper roller in step (2) are different. Specifically, the impurity elements in Example 2 include: F 0.019wt%, C 0.011wt%, O 0.038wt%, N 0.003wt%, H 0.0009wt%, and the pressure of the oil scraper roller is 2.2MPa.

[0086] Example 3 The process is basically the same as in Example 1, except that the impurity element content in step (1) and the roll roughness in the last three passes in step (2) are different. Specifically, the impurity elements in Example 3 include: F 0.014wt%, C 0.013wt%, O 0.036wt%, N 0.004wt%, H 0.001wt%, and the roll roughness in the second rolling process is Ra 0.25μm.

[0087] Example 4 The process is basically the same as in Example 1, except that the impurity element content in step (1) and the roll roughness in the last three passes in step (2) are different. Specifically, the impurity elements in Example 4 include: F 0.012wt%, C 0.010wt%, O 0.037wt%, N 0.003wt%, H 0.0007wt%, and the roll roughness in the second rolling process is Ra 0.2μm.

[0088] Example 5 The process is basically the same as in Example 1, except that the impurity element content in step (1) and the roll roughness in the second rolling process in step (2) are different. Specifically, the impurity elements in Example 5 include: F 0.015wt%, C 0.011wt%, O 0.039wt%, N 0.003wt%, H 0.0008wt%, and the roll roughness in the second rolling process is Ra 0.1μm.

[0089] Comparative Example 1 (1) Titanium strip coil raw material is prepared by using sponge titanium as raw material. The titanium strip coil raw material obtained by hot rolling and / or cold rolling and annealing contains the following impurity elements: F 0.012 wt%, C 0.010 wt%, O 0.040 wt%, N 0.003 wt%, H 0.0010 wt%.

[0090] (2) The above-mentioned titanium strip coil raw material is subjected to finished product cold rolling treatment to roll the titanium strip coil raw material with a thickness of 1.5 mm into titanium strip with a thickness of 0.5 mm; wherein, the temperature of finished product rolling treatment is room temperature; the roughness of the roll of the first finished product rolling treatment is Ra. 0.45 μm, and the number of passes is 7; the roughness of the roll of the second finished product rolling treatment is Ra. 0.2 μm, and the number of passes is 3; the rolling speed is 100 m / min, and the pressure of the scraper roll is 2.5 MPa.

[0091] (3) After the titanium strip is cold rolled, it is degreased and then annealed at 700℃ for 20 minutes; the width is fixed to obtain the titanium strip coil for deep drawing.

[0092] Comparative Example 2 It is basically the same as Example 1, except that the pressure of the oil scraper roller is different in step (2). Specifically, the pressure of the oil scraper roller in Comparative Example 2 is 3 MPa.

[0093] The parameters of some steps in the above embodiments and comparative examples are shown in Table 1.

[0094] Table 1 Performance testing The room temperature mechanical properties of titanium strip coils for deep drawing were tested according to GB / T 228; the cupping value (IE) of titanium strip coils for deep drawing was tested according to GB / T 4156, and the results are shown in Table 2.

[0095] Table 2 As shown in the table above, as the pressure of the scraper roller decreases and the roughness of the roller increases, the oxide layer of the material gradually increases, and the IE value gradually increases, but the tested room temperature mechanical properties remain basically unchanged.

[0096] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0097] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A method for preparing titanium strip coils for deep drawing, characterized in that, Includes the following steps: Provide titanium strip coil raw materials; Lubricating oil is applied to the titanium strip coil raw material for finished product rolling. During the finished product rolling process, the pressure applied to the titanium strip coil raw material by the oil scraper is controlled at 1.9MPa~2.1MPa to obtain oiled coil material; the residual lubricating oil content on the oiled coil material is 500mg / m. 2 • 800mg / m 2 ·noodle; The oil-coated coil is annealed to prepare titanium strip coil for deep drawing; and no degreasing treatment is performed after the finished product rolling process and before the annealing process. The finished product rolling process includes a first finished product rolling process and a second finished product rolling process performed sequentially. The surface roughness of the rolls after the first finished product rolling process is Ra 0.4μm~0.5μm, and the surface roughness of the rolls after the second finished product rolling process is Ra 0.28μm~0.35μm; The annealing process is performed in air.

2. The method for preparing deep-drawing titanium strip coils according to claim 1, characterized in that, The total deformation during the finished product rolling process is 60%~85%; and / or, The finished product rolling process consists of 10 to 20 passes; and / or, The temperature for the finished product rolling process is 20℃~25℃.

3. The method for preparing deep-drawing titanium strip coils according to claim 1, characterized in that, The second finished product is rolled in 3 passes.

4. The method for preparing deep-drawing titanium strip coils according to claim 1, characterized in that, The thickness reduction of the second finished product during rolling is 0.2mm to 0.8mm.

5. The method for preparing deep-drawing titanium strip coils according to any one of claims 1 to 4, characterized in that, The rolling speed for the finished product rolling process is 80m / min to 100m / min.

6. The method for preparing deep-drawing titanium strip coils according to any one of claims 1 to 4, characterized in that, The impurity elements in the titanium strip coil raw material, by mass percentage, include: Fe 0.01%~0.04%, C≤0.08%, O 0.04%~0.07%, N≤0.03% and H≤0.008wt%.

7. The method for preparing deep-drawing titanium strip coils according to any one of claims 1 to 4, characterized in that, The annealing process is performed at a temperature of 600℃~700℃ for a time of 3min~20min.

8. A titanium strip coil for deep drawing, characterized in that, It is prepared by the method for preparing deep-drawing titanium strip coils according to any one of claims 1 to 7.

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