A rolling method for titanium alloy bars

Abstract

The present disclosure relates to a method for rolling titanium alloy bars, comprising stepwise heating a titanium alloy billet to obtain a titanium alloy billet to be rolled; subjecting the titanium alloy billet to a first-heat rolling process to obtain a titanium alloy billet; and subjecting the titanium alloy billet to a high-temperature coating process, followed by a second-heat rolling process to obtain a titanium alloy bar. The high-temperature coating process comprises uniformly applying a high-temperature coating to the surface of the titanium alloy billet, followed by drying, heating, and heat-insulating treatment. The titanium alloy bar rolling method disclosed herein ensures batch stability for titanium alloy bars of larger diameter and weight while reducing production costs.

Description

Technical Field

[0001] This disclosure relates to the field of hot working technology of titanium alloy bars, and in particular to a rolling method for titanium alloy bars. Background Technology

[0002] Titanium alloys are alloy metals made from metallic titanium and other metals. They possess characteristics such as high strength, good corrosion resistance, high heat resistance, good low-temperature performance, and high chemical reactivity, and are widely used in the aerospace field. In the process of smelting and casting titanium alloy ingots, it is necessary to improve the scale and efficiency of smelting production while ensuring its quality, and to enhance the stability of production and quality.

[0003] Currently, the production of titanium alloy bars is trending towards larger diameters and greater individual weights. However, the downstream processing technology in this industry has consistently employed a forging-based blanking method. This involves sawing the ingot into sections based on the forging capacity, followed by segmented forging. For larger and heavier titanium alloy bars, such as ingots with diameters greater than 650mm and weights exceeding 5 tons, it is difficult to guarantee batch stability and processing economy. Therefore, it is necessary to propose a solution to address one or more of the problems existing in the aforementioned related technologies.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this disclosure is to provide a method for rolling titanium alloy bars, the method comprising the following steps:

[0006] Titanium alloy billets are heated in a stepped manner to obtain titanium alloy billets to be rolled.

[0007] The titanium alloy billet to be rolled is subjected to a single-fire rolling process to obtain a titanium alloy square billet.

[0008] After the titanium alloy billet is subjected to high-temperature coating treatment, it is subjected to two-fire rolling treatment to obtain titanium alloy bar.

[0009] The high-temperature coating process involves uniformly applying a high-temperature coating to the surface of the titanium alloy billet, followed by drying, heating, and heat preservation.

[0010] In an exemplary embodiment of this disclosure, the type of titanium alloy billet includes at least TA1 titanium alloy billet.

[0011] In an exemplary embodiment of this disclosure, the step of subjecting the titanium alloy billet to stepped heating to obtain the titanium alloy billet to be rolled includes:

[0012] The titanium alloy billet is placed in a bogie-type resistance furnace and heated to 790℃-810℃, then held at that temperature for 110min-130min.

[0013] Continue heating to 100℃-200℃ above the phase transformation point and hold for 500min-600min to obtain the titanium alloy billet to be rolled.

[0014] In an exemplary embodiment of this disclosure, the step of performing a single-fire rolling process on the titanium alloy billet to obtain a titanium alloy square billet includes:

[0015] The titanium alloy billet to be rolled is subjected to one-pass rolling, wherein the rolling direction of the one-pass rolling is unidirectional multi-pass rolling, and the total rolling deformation of the total number of passes is 80%-90%.

[0016] After air cooling, sawing, grinding, and inspection, the titanium alloy billet is obtained.

[0017] In an exemplary embodiment of this disclosure, the step of subjecting the titanium alloy billet to a high-temperature coating treatment followed by a second-heat rolling process to obtain a titanium alloy bar includes the following steps:

[0018] The high-temperature coating is evenly applied to the surface of the titanium alloy billet, dried, and then heated in a bogie-type resistance furnace to 50°C-200°C above the phase transformation point and held for 100-200 minutes.

[0019] In an exemplary embodiment of this disclosure, the step of performing a two-heat rolling process on the titanium alloy billet to obtain a titanium alloy bar includes:

[0020] The titanium alloy billet after the high-temperature treatment is subjected to the second-heat rolling process.

[0021] After online straightening, air cooling, sawing, peeling and grinding, the titanium alloy rod is obtained;

[0022] The minimum diameter of the titanium alloy rod is 90 mm.

[0023] In an exemplary embodiment of this disclosure, in the step of subjecting the titanium alloy billet to high-temperature coating treatment and then performing a two-rolling process to obtain titanium alloy bars, the rolling equipment for the two-rolling process includes a 1350 type two-roll reversible billet mill and an 850 type two-roll reversible billet mill.

[0024] In an exemplary embodiment of this disclosure, in the step of subjecting the titanium alloy billet to high-temperature coating treatment and then performing a two-pass rolling process to obtain a titanium alloy bar, the two-pass rolling is a continuous, bidirectional, multi-pass rolling process with a total rolling deformation of 80%-90%.

[0025] The technical solution provided in this disclosure may include the following beneficial effects:

[0026] This disclosure proposes a rolling method for titanium alloy ingots, which involves step heating, single-fire rolling, high-temperature coating, and double-fire rolling of titanium alloy ingots to ensure batch stability of titanium alloy bars with large diameters and weights, while reducing production costs. Attached Figure Description

[0027] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0028] Figure 1 A schematic diagram illustrating the steps of a rolling method for a titanium alloy bar in an exemplary embodiment of the present disclosure is shown.

[0029] Figure 2 A schematic diagram of the microstructure of TA1 bars obtained by rolling in Embodiment 1 of the exemplary embodiments of this disclosure is shown;

[0030] Figure 3 A schematic diagram of the microstructure of TA1 bars obtained by rolling in Embodiment 2 of the exemplary embodiments of this disclosure is shown;

[0031] Figure 4 A schematic diagram of the microstructure of TA1 bar obtained by rolling in Example 3 of the exemplary embodiments of this disclosure is shown. Detailed Implementation

[0032] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided so that this disclosure will be more comprehensive and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0033] Furthermore, the accompanying drawings are merely illustrative of this disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. Some block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities may be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0034] This example embodiment provides a method for rolling titanium alloy bars, such as... Figure 1 As shown, the method may include the following steps:

[0035] Step S101: The titanium alloy billet is heated in a stepped manner to obtain the titanium alloy billet to be rolled.

[0036] Step S102: Perform a single-fire rolling process on the titanium alloy billet to obtain a titanium alloy square billet.

[0037] Step S103: After high-temperature coating treatment, titanium alloy billet is subjected to two-stage rolling to obtain titanium alloy bar.

[0038] It should be noted that this high-temperature coating process involves uniformly applying a high-temperature coating to the surface of the titanium alloy billet, followed by drying, heating, and heat preservation.

[0039] This disclosure proposes a rolling method for titanium alloy ingots. By subjecting the titanium alloy ingots to stepped heating, single-fire rolling, high-temperature coating, and double-fire rolling, batch stability of large-diameter and heavy titanium alloy ingots is achieved while reducing production costs.

[0040] The steps of the method described above in this example embodiment will now be explained in more detail.

[0041] Example 1:

[0042] The titanium alloy billet used in this embodiment of the present disclosure is a TA1 titanium alloy billet. TA1 titanium alloy is one of the most common titanium alloys, mainly composed of elements such as titanium, iron, oxygen, and carbon. Its chemical composition is shown in Table 1 below.

[0043] Table 1 Chemical composition of TA1 titanium alloy

[0044] element Mass percentage (%) Titanium 99％-99.52％ iron 0.2％-0.25％ oxygen element 0.1％-0.2％ carbon element 0.05％-0.1％ Nitrogen 0.02％-0.03％ hydrogen element 0.01％-0.015％ Other elements 0.1％-0.4％

[0045] As shown in Table 1, titanium is the main component of titanium alloys, with the highest content. Due to the properties of titanium, the synthesized TA1 titanium alloy possesses low density, high strength, corrosion resistance, and good biocompatibility. The addition of iron, oxygen, carbon, and nitrogen elements improves the strength and hardness of the titanium alloy and also increases the corrosion resistance of TA1 titanium alloy. The addition of hydrogen element improves the plasticity and toughness of TA1 titanium alloy, and also increases its corrosion resistance to some extent.

[0046] Other elements in TA1 titanium alloy include copper, silicon, aluminum, molybdenum, and zinc. The addition of these elements improves the mechanical properties, corrosion resistance, and machinability of TA1 titanium alloy. However, experiments have shown that adding too many of these other elements can actually decrease the performance of TA1 titanium alloy. Therefore, it is necessary to control the type and content of these other elements as needed.

[0047] Example 1:

[0048] This embodiment proposes a rolling method for titanium alloy bars, such as... Figure 1 As shown, the specific steps are as follows:

[0049] Step S101: First, the TA1 titanium alloy billet is placed in a bogie-type resistance furnace for stepped heating. After heating to 790°C, it is held for 110 minutes. Then, it is heated to 100°C above the phase transformation point and held for 500 minutes to obtain the TA1 titanium alloy billet to be rolled.

[0050] Titanium is difficult to heat due to its low thermal conductivity. Surface heating methods typically involve long heating times, and large cross-sectional temperature differences occur when heating large billets. Unlike copper, iron, and nickel-based alloys, whose thermal conductivity decreases with increasing temperature, titanium alloys exhibit increased thermal conductivity with temperature. To ensure smooth hot working and minimize the temperature drop of the doped metals during processing, especially reducing surface quenching of the billet, a stepped heating method is employed. Preheating the titanium alloy ingot is essential; otherwise, the temperature drop of the doped metals and surface quenching can prevent proper mold filling and may lead to surface cracks. When the temperature increases, the doped metals react strongly with air. Above 650°C, titanium reacts strongly with oxygen; above 700°C, titanium reacts with nitrogen, forming a deep surface layer saturated with these two gases. Holding the temperature for a certain time allows for complete reaction. Stepped heating effectively addresses the problems of low thermal conductivity and severe gas absorption at excessively high temperatures in titanium alloys during heating.

[0051] Step S102: The TA1 titanium alloy billet to be rolled is subjected to a single-pass rolling process, specifically, the TA1 titanium alloy billet to be rolled is subjected to unidirectional multi-pass rolling, and the total rolling deformation of the single-pass rolling is 80%. After air cooling, sawing, grinding and inspection, the TA1 titanium alloy square billet is obtained.

[0052] It should be noted that rolling deformation refers to the amount of plastic deformation that occurs in a material during the rolling process. During rolling, the material undergoes continuous pressing and stretching, resulting in changes in both volume and shape, usually expressed as a percentage. The magnitude of rolling deformation is related to rolling process parameters such as roll diameter, roll groove shape, rolling temperature, and rolling speed. By adjusting these parameters, the amount of rolling deformation can be controlled to achieve the desired material properties and shape. Since rolling deformation has a significant impact on material properties and quality, an appropriate amount of rolling deformation can improve the material's microstructure and mechanical properties, increasing its strength and plasticity; while excessive or insufficient rolling deformation may negatively affect material properties and even lead to defects such as cracks and deformation.

[0053] In this embodiment 1, to facilitate the rolling of TA1 titanium alloy ingots into rectangular billets, the total rolling deformation per pass is controlled at 80%, making it easier to shape into rectangular or square billets, thus facilitating the rolling pass. Generally, pure titanium has two allotropes under normal pressure: α-Ti below 882.5℃, with a close-packed hexagonal lattice and a lattice constant a = 2.951 × 10⁻⁶. -10 m, c / a = 1.587, slightly smaller than the axial ratio of 1.633 for a typical close-packed hexagonal lattice. Above 882.5℃, it is β-Ti, with a body-centered cubic lattice and a lattice constant a = 3.28 × 10⁻⁶. -10 The volume effect of the α-to-β phase transformation is small, approximately 0.17%. In one-fire rolling, the phase transformation temperature of titanium alloys is 890℃-930℃. When industrial pure titanium is rapidly cooled from the β phase region (>200℃ / s), a martensitic transformation occurs, yielding acicular α-phase. ’ Phase structure. At low cooling rates, martensite needles do not form due to strong stress relaxation. If quenched from the α+β region temperature, primary α phase and α... ’ Composition of different ratios of martensitic phase.

[0054] Step S103 involves subjecting the obtained titanium alloy billet to a high-temperature coating treatment. This high-temperature coating involves uniformly applying a high-temperature coating material to the surface of the TA1 titanium alloy billet, drying it, and then heating it in a bogie-type resistance furnace to 50°C above the phase transformation point and holding it at that temperature for 100 minutes. The high-temperature coating technology can significantly improve the surface cracking problem during the rolling process of titanium alloy billets, increasing the yield of titanium alloy bars by approximately 2%.

[0055] TA1 titanium alloy billets, after high-temperature coating, are subjected to two-stage rolling; then, after online straightening, air cooling, sawing, peeling, and grinding, TA1 titanium alloy bars are obtained. The diameter of the TA1 titanium alloy bars is 90 mm. The straightness of the online straightening is less than or equal to 5 mm / m.

[0056] In this Example 1, after a detailed understanding of the effects of thermal radiation cooling, breadth coefficient, plasticity, and deformation resistance on different grades of titanium and titanium alloy ingots, and considering factors such as the principle of plastic deformation, roll properties, bite friction coefficient, maximum bite angle, equipment capacity, and operator skill level, the rolling equipment selected for the two-heat rolling process was an improvement on the original 850-type two-roll reversible billet mill. A completely new 1350-type two-roll reversible billet mill was designed. This billet mill, due to the larger nominal diameter of the rolls, can achieve stable rolling of titanium and titanium alloy ingots with diameters of 760mm-920mm.

[0057] Furthermore, the 1350 type two-roll reversible billet mill and the 850 type two-roll reversible billet mill are used in combination, thereby realizing uninterrupted linkage rolling in the two-fire rolling. Therefore, the two-fire rolling in this embodiment 1 is an uninterrupted linkage bidirectional multi-pass rolling, and the total rolling deformation of the two-fire rolling is controlled at 80%.

[0058] like Figure 2 The diagram shown is a schematic microstructure of the TA1 titanium alloy rod prepared in Example 1. Figure 2 As can be seen, the microstructure during the rolling process is almost devoid of lamellar α-structure and is uniformly equiaxed, indicating that the TA1 titanium alloy bar prepared by the method proposed in this disclosure has a good degree of axialization.

[0059] Example 2

[0060] Step S101: First, the TA1 titanium alloy billet is placed in a bogie-type resistance furnace for stepped heating. After heating to 800°C, it is held for 120 minutes. Then, it is heated to 150°C above the phase transformation point and held for 550 minutes to obtain the TA1 titanium alloy billet to be rolled. The reasons for adopting stepped heating and the resulting technical effects have been discussed in Example 1.

[0061] Step S102: The TA1 titanium alloy billet to be rolled is subjected to a single-pass rolling process, specifically, the TA1 titanium alloy billet to be rolled is subjected to unidirectional multi-pass rolling, and the total rolling deformation of the single-pass rolling is 85%. After air cooling, sawing, grinding and inspection, the TA1 titanium alloy square billet is obtained.

[0062] It should be noted that rolling deformation refers to the amount of plastic deformation that occurs in a material during the rolling process. During rolling, the material undergoes continuous pressing and stretching, resulting in changes in both volume and shape, usually expressed as a percentage. The magnitude of rolling deformation is related to rolling process parameters such as roll diameter, roll groove shape, rolling temperature, and rolling speed. By adjusting these parameters, the amount of rolling deformation can be controlled to achieve the desired material properties and shape. Since rolling deformation has a significant impact on material properties and quality, an appropriate amount of rolling deformation can improve the material's microstructure and mechanical properties, increasing its strength and plasticity; while excessive or insufficient rolling deformation may negatively affect material properties and even lead to defects such as cracks and deformation.

[0063] In this embodiment 2, in order to facilitate the rolling of TA1 titanium alloy billet into rectangular billet, the rolling deformation is controlled at 85%, making it easier to shape into rectangular or square billet, which facilitates the rolling of the die.

[0064] Step S103 involves subjecting the obtained titanium alloy billet to a high-temperature coating treatment. This high-temperature coating involves uniformly applying a high-temperature coating material to the surface of the TA1 titanium alloy billet, drying it, and then heating it in a bogie-type resistance furnace to 120°C above the phase transformation point and holding it at that temperature for 150 minutes. The high-temperature coating technology can significantly improve the surface cracking problem during the rolling process of titanium alloy billets, increasing the yield of the bars by approximately 2%.

[0065] TA1 titanium alloy billets, after high-temperature coating, are subjected to two-stage rolling; then, after online straightening, air cooling, sawing, peeling, and grinding, TA1 titanium alloy bars are obtained. The diameter of the TA1 titanium alloy bars is 91 mm. The straightness of the online straightening is less than or equal to 5 mm / m.

[0066] In this embodiment 2, the 1350 type two-roll reversible billet mill and the 850 type two-roll reversible billet mill are used in combination to realize uninterrupted linkage rolling in the two-fire rolling. Therefore, the two-fire rolling in this embodiment 2 is an uninterrupted linkage bidirectional multi-pass rolling, and the total rolling deformation of the two-fire rolling is controlled at 85%.

[0067] like Figure 3 The diagram shown is a schematic microstructure of the TA1 titanium alloy rod obtained in Example 2. Figure 3 As can be seen, the microstructure exhibits no edge cracks or surface cracks during the rolling process, demonstrating good surface quality. The small amount of rod-shaped α-structure present in the microstructure is uniformly distributed equiaxed. This indicates that the TA1 titanium alloy rods prepared using the method proposed in this disclosure have a good degree of axialization.

[0068] Example 3

[0069] Step S101: First, the TA1 titanium alloy billet is placed in a bogie-type resistance furnace for stepped heating, heated to 810°C and held for 130 minutes; then, it is further heated to 200°C above the phase transformation point and held for 600 minutes to obtain the TA1 titanium alloy ingot to be rolled. The reasons for adopting stepped heating and the resulting technical effects have been discussed in Example 1.

[0070] Step S102: The TA1 titanium alloy billet to be rolled is subjected to a single-pass rolling process, specifically, the TA1 titanium alloy billet to be rolled is subjected to unidirectional multi-pass rolling, and the total rolling deformation of the single-pass rolling is 90%. After air cooling, sawing, grinding and inspection, the TA1 titanium alloy square billet is obtained.

[0071] It should be noted that rolling deformation refers to the amount of plastic deformation that occurs in a material during the rolling process. During rolling, the material undergoes continuous pressing and stretching, resulting in changes in both volume and shape, usually expressed as a percentage. The magnitude of rolling deformation is related to rolling process parameters such as roll diameter, roll groove shape, rolling temperature, and rolling speed. By adjusting these parameters, the amount of rolling deformation can be controlled to achieve the desired material properties and shape. Since rolling deformation has a significant impact on material properties and quality, an appropriate amount of rolling deformation can improve the material's microstructure and mechanical properties, increasing its strength and plasticity; while excessive or insufficient rolling deformation may negatively affect material properties and even lead to defects such as cracks and deformation.

[0072] In this embodiment 3, in order to facilitate the rolling of TA1 titanium alloy billet into rectangular billet, the total rolling deformation of the total number of passes is controlled at 90%, making it easier to shape into rectangular or square billets, which facilitates the rolling of the die.

[0073] Step S103 involves subjecting the obtained titanium alloy billet to a high-temperature coating treatment. This high-temperature coating involves uniformly applying a high-temperature coating material to the surface of the TA1 titanium alloy billet, followed by heating in a bogie-type resistance furnace to 200°C above the phase transformation point and holding at that temperature for 200 minutes. The high-temperature coating technology can significantly improve the surface cracking problem during the rolling process of titanium alloy billets, increasing the yield of the bars by approximately 2%.

[0074] TA1 titanium alloy billets, after high-temperature coating, are subjected to two-stage rolling; then, after online straightening, air cooling, sawing, peeling, and grinding, TA1 titanium alloy bars are obtained. The diameter of the TA1 titanium alloy bars is 92 mm. The straightness of the online straightening is less than or equal to 5 mm / m.

[0075] In this embodiment 3, the 1350 type two-roll reversible billet mill and the 850 type two-roll reversible billet mill are used in combination to realize uninterrupted linkage rolling in the two-fire rolling. Therefore, the two-fire rolling in this embodiment 2 is an uninterrupted linkage bidirectional multi-pass rolling, and the total rolling deformation of the two-fire rolling is controlled at 90%.

[0076] like Figure 4 The diagram shown is a schematic microstructure of the TA1 titanium alloy rod obtained in Example 3. Figure 4 As can be seen, the microstructure exhibits no edge cracks or surface cracks during the rolling process, demonstrating good surface quality. The small amount of rod-shaped α-structure present in the microstructure is uniformly distributed equiaxed. This indicates that the TA1 titanium alloy rods prepared using the method proposed in this disclosure have a good degree of axialization.

[0077] It should be noted that in the three embodiments, the rolling equipment used for the first-fire rolling is a Φ1350mm two-roll reversible billet mill.

[0078] It should be noted that although the steps of the method in this disclosure are described in a specific order in the accompanying drawings, this does not require or imply that these steps must be performed in that specific order, or that all the steps shown must be performed to achieve the desired result. Additional or alternative steps may be omitted, multiple steps may be combined into one step, and / or a step may be broken down into multiple steps. Furthermore, it is readily understood that these steps may be executed synchronously or asynchronously, for example, in multiple modules / processes / threads.

[0079] It should be noted that although several units of the system for executing actions have been mentioned in the detailed description above, this division is not mandatory. In fact, according to embodiments of this disclosure, the features and functions of two or more units described above can be embodied in one unit. Conversely, the features and functions of one unit described above can be further divided and embodied by multiple units. Some or all of the units can be selected to achieve the purpose of this disclosure according to actual needs. Those skilled in the art can understand and implement this without any inventive effort.

[0080] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the appended claims.

Claims

1. A method for rolling titanium alloy bars, characterized in that, Includes the following steps: Titanium alloy billets are heated in a stepped manner to obtain titanium alloy billets to be rolled. The titanium alloy billet to be rolled is subjected to a single-pass rolling process to obtain a titanium alloy square billet; the rolling direction of the single-pass rolling is unidirectional multi-pass rolling, and the total rolling deformation of the passes is 80%-90%. The titanium alloy billet is subjected to high-temperature coating treatment and then subjected to two-heat rolling treatment to obtain titanium alloy bar material, wherein the minimum diameter of the titanium alloy bar material is 90mm. The high-temperature coating process involves uniformly applying a high-temperature coating to the surface of the titanium alloy billet, followed by drying, heating, and heat preservation. The rolling equipment for the two-roll reversible billet mill includes a 1350-type two-roll reversible billet mill and an 850-type two-roll reversible billet mill. The two-pass rolling process is a continuous, bidirectional, multi-pass rolling process, with a total rolling deformation of 80%-90%.

2. The rolling method for titanium alloy bars according to claim 1, characterized in that, The type of titanium alloy billet includes at least TA1 titanium alloy billet.

3. The rolling method for titanium alloy bars according to claim 1, characterized in that, The step of subjecting the titanium alloy billet to stepped heating to obtain the titanium alloy billet to be rolled includes: The titanium alloy billet is placed in a bogie-type resistance furnace and heated to 790℃-810℃, then held at that temperature for 110min-130min. Continue heating to 100℃-200℃ above the phase transformation point and hold for 500min-600min to obtain the titanium alloy billet to be rolled.

4. The rolling method for titanium alloy bars according to claim 1, characterized in that, The step of performing a single-heat rolling process on the titanium alloy billet to obtain a titanium alloy square billet includes: The titanium alloy billet to be rolled is subjected to one-fire rolling, followed by air cooling, sawing, grinding and inspection to obtain the titanium alloy square billet.

5. The rolling method for titanium alloy bars according to claim 1, characterized in that, In the step of subjecting the titanium alloy billet to high-temperature coating treatment followed by two-heat rolling to obtain titanium alloy bars, the high-temperature coating treatment step includes: The high-temperature coating is evenly applied to the surface of the titanium alloy billet, and after drying, it is heated in a bogie-type resistance furnace to 50°C-200°C above the phase transformation point and held for 100-200 minutes.

6. The rolling method for titanium alloy bars according to claim 5, characterized in that, The step of performing a two-heat rolling process on the titanium alloy billet to obtain titanium alloy bars includes: The titanium alloy billet after the high-temperature treatment is subjected to the second-heat rolling process. After online straightening, air cooling, sawing, peeling and grinding, the titanium alloy rod is obtained.

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