Production process of cold-rolled titanium strip for deep drawing processing

Abstract

The cold-rolled titanium strip production process comprises the following steps that S1, raw materials are prepared, and the content of elements such as oxygen and iron in the raw materials is controlled; s2, hot rolling treatment: carrying out hot rolling treatment on the raw material titanium belt, and then carrying out acid pickling treatment; s3, cold rolling forming is conducted, specifically, the titanium strip obtained after acid pickling is subjected to cold rolling treatment, and the total reduction rate of the titanium strip reaches 60%-80% through multi-pass cold rolling; s4, surface treatment is conducted, specifically, the titanium strip subjected to cold rolling forming is degreased and cleaned, oil stains on the surface are removed, and the clean surface is obtained; s5, finished product annealing is conducted, specifically, the titanium strip subjected to cold rolling and surface treatment is subjected to continuous annealing treatment, the needed performance and microscopic structure are obtained, and anisotropy is reduced; and S6, quality inspection and packaging.

Description

Technical Field

[0001] The invention belongs to the technical field of titanium strip production, and in particular relates to a production process of a cold-rolled titanium strip used for deep drawing processing. Background Art

[0002] The cold rolling process applies strong mechanical force to the titanium strip, causing it to undergo plastic deformation at room temperature to achieve the required thickness and dimensional accuracy. During this process, complex stress distribution and microstructural changes will occur inside the material. If the process parameters are not properly controlled, such as excessive rolling force, mismatched rolling speed, uneven cooling rate, or defects in the raw materials themselves, stress concentration may occur inside the titanium strip, leading to the formation of cracks. These cracks may be small and difficult to detect at the beginning, but with subsequent processing or use, they may gradually expand, eventually causing the material to break, seriously affecting the service life and safety of the product.

[0003] The presence of cracks not only weakens the mechanical strength of titanium strips, but also may become a channel for corrosive media to invade, accelerate the corrosion process of the material, and further reduce the corrosion resistance of the product. For titanium parts used in extreme environments such as aerospace, any tiny crack may be a catastrophic starting point, threatening flight safety. In the chemical industry, cracks may cause titanium containers or pipelines to leak, causing environmental pollution or safety accidents. Summary of the invention

[0004] The purpose of the present invention is to propose a cold-rolled titanium strip production process for deep drawing processing in order to solve the problem that the existence of cracks not only weakens the mechanical strength of the titanium strip, but also may become a channel for the invasion of corrosive media, accelerate the corrosion process of the material, further reduce the corrosion resistance of the product, and pose a safety hazard.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme: a cold-rolled titanium strip production process for deep drawing processing, comprising the following steps:

[0006] S1: Raw material preparation, selecting titanium strips with low impurity content as raw materials, ensuring the purity and quality of the titanium strips, and controlling the content of oxygen, iron and other elements in the raw materials;

[0007] S2: hot rolling treatment, hot rolling the titanium strip as the raw material, followed by pickling treatment, wherein the pickling removal amount is controlled between 2.0% and 3.5% of the thickness of the titanium strip, so as to remove the oxide scale and other impurities generated during the hot rolling process;

[0008] S3: cold rolling forming, cold rolling the pickled titanium strip, and through multiple cold rolling passes, the total reduction rate of the titanium strip reaches 60% to 80%;

[0009] S4: Surface treatment, degreasing and cleaning the titanium strip after cold rolling to remove surface oil stains and obtain a clean surface;

[0010] S5: Finished product annealing, continuously annealing the titanium strip after cold rolling and surface treatment to obtain the desired performance and microstructure and reduce anisotropy;

[0011] S6: Quality inspection and packaging. The annealed titanium strip is subjected to strict quality inspection, including appearance inspection, dimension measurement, mechanical property test, chemical composition analysis and protective film performance evaluation to ensure that the product meets relevant standards. It is then coiled and packaged for easy storage and transportation.

[0012] As a further description of the above technical solution:

[0013] The oxygen content of the titanium strip in S1 is ≤0.06%, and the iron content is ≤0.05%.

[0014] As a further description of the above technical solution:

[0015] The rolling speed of the cold rolling process in S3 is 50 to 150 m / min.

[0016] As a further description of the above technical solution:

[0017] Alloy is pre-added in S1, and the alloy elements are molybdenum, nickel, chromium and aluminum.

[0018] As a further description of the above technical solution:

[0019] In S4, the surface of the titanium strip after cold rolling may be subjected to heat treatment or high-temperature oxidation to form a uniform and dense oxide film.

[0020] As a further description of the above technical solution:

[0021] The titanium strip may also be subjected to surface pretreatment between S1 and S2. The specific steps include cleaning and polishing the surface of the titanium strip. The titanium strip is cleaned with a 5% nitric acid solution to remove the oxide layer and impurities on the surface, and then polished with an ultrasonic cleaner to ensure that the surface of the titanium strip is smooth and clean.

[0022] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0023] 1. In the present invention, an oxide film or a nano-coating is provided on the titanium strip, and the nano-coating improves the wear resistance and scratch resistance of the titanium strip. The cold-rolled titanium strip product produced by the production process not only meets the high requirements of deep drawing processing on material properties (high strength, high toughness, good corrosion resistance and wear resistance, etc.), but also further enhances the functionality of the titanium strip through the combination of surface oxidation treatment and nano-coating technology, significantly improves its processing performance and forming quality, and finally, through the alloy element addition technology, further enhances the functionality of the titanium strip and prolongs its service life.

[0024] 2. In the present invention, the alloy elements are evenly distributed in the titanium strip through hot rolling and cold rolling processes, and the crack resistance of the titanium strip is improved by changing the surface properties and internal microstructure of the material, thereby improving the overall strength and toughness, thereby significantly enhancing its crack resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 A step diagram of a cold-rolled titanium strip production process for deep drawing. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0031] In the description of the embodiments of the present invention, it should be noted that the terms "upper", "inner", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0032] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] See also Figure 1 The present invention provides a technical solution: a cold-rolled titanium strip production process for deep drawing, comprising the following steps:

[0034] S1: Raw material preparation, selecting titanium strips with low impurity content as raw materials, ensuring the purity and quality of the titanium strips, and controlling the content of oxygen, iron and other elements in the raw materials;

[0035] S2: hot rolling treatment, hot rolling the titanium strip as the raw material, followed by pickling treatment, wherein the pickling removal amount is controlled between 2.0% and 3.5% of the thickness of the titanium strip, so as to remove the oxide scale and other impurities generated during the hot rolling process;

[0036] S3: cold rolling forming, cold rolling the pickled titanium strip, and through multiple cold rolling passes, the total reduction rate of the titanium strip reaches 60% to 80%;

[0037] S4: Surface treatment, degreasing and cleaning the titanium strip after cold rolling to remove surface oil stains and obtain a clean surface;

[0038] S5: Finished product annealing, continuously annealing the titanium strip after cold rolling and surface treatment to obtain the desired performance and microstructure and reduce anisotropy;

[0039] S6: Quality inspection and packaging. The annealed titanium strip is subjected to strict quality inspection, including appearance inspection, dimension measurement, mechanical property test, chemical composition analysis and protective film performance evaluation to ensure that the product meets relevant standards. It is then coiled and packaged for easy storage and transportation.

[0040] The oxygen content of the titanium strip in S1 is ≤0.06%, and the iron content is ≤0.05%.

[0041] The rolling speed of the cold rolling process in S3 is 50 to 150 m / min.

[0042] The alloy is added in advance in S1, and the alloy elements include but are not limited to molybdenum, nickel, chromium and aluminum, so as to change the microstructure of the titanium strip, thereby improving its overall performance, especially the crack resistance.

[0043] In S4, the surface of the titanium strip after cold rolling may be subjected to heat treatment or high-temperature oxidation to form a uniform and dense oxide film.

[0044] At the same time, the nanoparticles can be firmly attached to the surface of the titanium strip through UV curing to form a uniform and dense nano-coating.

[0045] The titanium strip may also be subjected to surface pretreatment between S1 and S2. The specific steps include cleaning and polishing the surface of the titanium strip. The titanium strip is cleaned with a 5% nitric acid solution to remove the oxide layer and impurities on the surface, and then polished with an ultrasonic cleaner to ensure that the surface of the titanium strip is smooth and clean.

[0046] Working principle: By setting an oxide film or nano-coating on the titanium strip, the nano-coating improves the wear resistance and scratch resistance of the titanium strip. The cold-rolled titanium strip products produced by this production process not only meet the high requirements of deep drawing processing on material properties (high strength, high toughness, good corrosion resistance and wear resistance, etc.), but also through the combination of surface oxidation treatment and nano-coating technology, the functionality of the titanium strip is further enhanced, and its processing performance and forming quality are significantly improved. Finally, the functionality of the titanium strip is further enhanced and its service life is extended through the alloy element addition technology. In addition, through the hot rolling and cold rolling processes, the alloy elements are evenly distributed in the titanium strip. By changing the surface properties and internal microstructure of the material, the crack resistance of the titanium strip is improved, the overall strength and toughness are improved, and its crack resistance is significantly enhanced.

[0047] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A cold-rolled titanium strip production process for deep drawing, characterized in that: The following steps are involved: S1: Raw material preparation, selecting titanium strips with low impurity content as raw materials, ensuring the purity and quality of the titanium strips, and controlling the content of oxygen, iron and other elements in the raw materials; S2: hot rolling treatment, hot rolling the titanium strip as the raw material, followed by pickling treatment, wherein the pickling removal amount is controlled between 2.0% and 3.5% of the thickness of the titanium strip, so as to remove the oxide scale and other impurities generated during the hot rolling process; S3: cold rolling forming, cold rolling the pickled titanium strip, and through multiple cold rolling passes, the total reduction rate of the titanium strip reaches 60% to 80%; S4: surface treatment, degreasing and cleaning the titanium strip after cold rolling to remove surface oil stains and obtain a clean surface; S5: Finished product annealing, continuously annealing the titanium strip after cold rolling and surface treatment to obtain the desired performance and microstructure and reduce anisotropy; S6: Quality inspection and packaging. The annealed titanium strip is subjected to strict quality inspection, including appearance inspection, dimension measurement, mechanical property test, chemical composition analysis and protective film performance evaluation to ensure that the product meets relevant standards. It is then coiled and packaged for easy storage and transportation.

2. A cold-rolled titanium strip production process for deep drawing according to claim 1, characterized in that: The oxygen content of the titanium strip in S1 is ≤0.06%, and the iron content is ≤0.05%.

3. A cold-rolled titanium strip production process for deep drawing according to claim 2, characterized in that: The rolling speed of the cold rolling process in S3 is 50 to 150 m / min.

4. The cold-rolled titanium strip production process for deep drawing according to claim 1, characterized in that: Alloys may also be added in advance to the S1, and the alloy elements include molybdenum, nickel, chromium and aluminum.

5. The cold-rolled titanium strip production process for deep drawing according to claim 1, characterized in that: In S4, the surface of the titanium strip after cold rolling may be subjected to heat treatment or high-temperature oxidation to form a uniform and dense oxide film.

6. The process for producing cold-rolled titanium strip for deep drawing according to claim 1, characterized in that: The titanium strip may also be subjected to surface pretreatment between S1 and S2. The specific steps include cleaning and polishing the surface of the titanium strip. The titanium strip is cleaned with a 5% nitric acid solution to remove the oxide layer and impurities on the surface, and then polished with an ultrasonic cleaner to ensure that the surface of the titanium strip is smooth and clean.

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