A method for preparing corrosion-resistant Ti-Ru alloy plate

Abstract

The present invention discloses a method for preparing a corrosion-resistant Ti-Ru alloy plate, which comprises the following steps: 1. using titanium sponge and Ru powder as ingredients; 2. partially mixing, layering and pressing the materials, and then smelting to obtain an alloy ingot; 3. single-fire forging; 4. two-fire forging and three-fire forging; 5. four-fire slab forging; 6. multi-pass rolling; 7. straightening and heat treatment to obtain the corrosion-resistant Ti-Ru alloy plate. The present invention avoids segregation of Ru elements and reduces loss by optimizing the material distribution method, obtains an alloy slab with uniform structure by multi-fire forging above the phase transition point combined with a reversing upsetting process, and obtains a composite structure consisting of a fine-grained matrix and a nano-precipitated phase by controlling the rolling temperature, rolling deformation, and heat treatment system. The Ti-Ru alloy plate has both excellent corrosion resistance and mechanical properties, and is suitable for oil and gas transportation and the chemical industry.

Description

Technical Field

[0001] The present invention relates to the technical field of titanium alloys, and in particular to a method for preparing a corrosion-resistant Ti-Ru alloy plate. Background Art

[0002] Industrially pure titanium has excellent corrosion resistance and high specific strength, and is widely used in seawater cooling and desalination, as well as in equipment for transporting solutions such as salt solutions, wet chlorine, and nitric acid. Titanium's corrosion resistance comes from the dense oxide film formed when it is oxidized, which can hinder the dissolution of the matrix in the corrosive medium and increase the self-corrosion potential. However, pure titanium is severely corroded in reducing acids and is prone to crevice corrosion in higher-temperature chloride solutions, limiting its wider application. Studies have shown that the addition of trace amounts of Ru to pure titanium will form dispersed Ru-rich precipitates on the α-phase matrix. The Ru-rich surface produced during the dissolution of these precipitates accelerates the reduction of hydrogen ions, shifting the corrosion potential of the alloy toward the positive direction, inhibiting further corrosion of the alloy matrix, and thus effectively improving the corrosion resistance of titanium alloys.

[0003] At present, there are two problems in the processing of Ti-Ru alloy: the first is the uniformity of Ru element distribution. The Ru content in Ti-Ru alloy is usually around 0.1%, and its melting point (2310℃) and density (12.3g / cm 3 ) are greater than the matrix element Ti, so defects such as segregation and inclusions are prone to occur during smelting. Patent CN101481759A discloses a method for preparing Ru-containing titanium alloys, which directly mixes Ru powder, intermediate alloy and sponge titanium, and presses electrodes. Since the particle size of Ru powder is very small, its adhesion to large-particle sponge titanium and intermediate alloy is poor. Therefore, direct mixing can easily lead to Ru powder segregation at the bottom and cause certain losses. This can be seen from its implementation case that the composition of Ru elements at the head and tail of the ingot is inconsistent, and the measured composition is less than the nominal composition (the maximum deviation reaches 9%). Secondly, corrosion-resistant Ti-Ru alloys usually need to be processed into plates for application in various chemical equipment, reaction vessels and pipelines, etc. Its application scenarios not only require excellent corrosion resistance, but also have certain requirements for mechanical properties. Therefore, how to optimize the grain size, texture characteristics and phase composition of Ti-Ru alloy plates by setting reasonable forging, rolling and heat treatment processes so that the final alloy plates have both good corrosion resistance and mechanical properties is a key problem that needs to be solved urgently. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the shortcomings of the above-mentioned prior art and provide a method for preparing a corrosion-resistant Ti-Ru alloy sheet. This method avoids segregation of the Ru element and reduces loss by optimizing the material distribution method. An alloy slab with a uniform structure is obtained through multiple forgings above the phase transformation point combined with a reversing upsetting process. By controlling the holding temperature of multiple rolling passes, the deformation amount of a single rolling pass, and the heat treatment system, a composite structure consisting of a fine-grained matrix and a nano-precipitated phase is obtained. This allows the Ti-Ru alloy sheet to have both excellent corrosion resistance and mechanical properties, solving the problem of Ti-Ru alloys being prone to smelting defects and poor mechanical properties in the prior art.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is: a method for preparing a corrosion-resistant Ti-Ru alloy plate, characterized in that the method comprises the following steps:

[0006] Step 1: Using titanium sponge and Ru powder as raw materials, and mixing according to the designed composition of the target product; the titanium sponge includes titanium sponge with a particle size of 9.8 mm to 23.4 mm and a particle size not exceeding 5 mm, and the particle size of the Ru powder does not exceed 50 μm; the designed composition of the target product is calculated by mass content: Ru 0.08% to 0.1%, and the remainder is Ti;

[0007] Step 2: Partially mix, layer and press the raw materials prepared in step 1, and then perform vacuum consumable melting three times to obtain an alloy ingot;

[0008] Step 3: subjecting the alloy ingot obtained in step 2 to single-fire forging in a high-temperature single-phase region to obtain a single-fire forged ingot;

[0009] Step 4: subjecting the single-fire forging ingot obtained in step 3 to two-fire forging and three-fire forging in a high-temperature single-phase region to obtain a three-fire forging ingot;

[0010] Step 5: Forging the three-fire forged ingot obtained in step 4 into a four-fire slab in a two-phase region to obtain an alloy slab;

[0011] Step 6: grinding and repairing the surface of the alloy slab obtained in step 5, and then performing multiple passes of rolling on a reversible hot rolling mill to obtain an alloy plate;

[0012] Step 7: straighten and heat treat the alloy plate obtained in step 6 to obtain a corrosion-resistant Ti-Ru alloy plate.

[0013] The aforementioned method for preparing a corrosion-resistant Ti-Ru alloy sheet is characterized in that the partial mixing process in step 2 comprises uniformly mixing all the Ru powder with titanium sponge having a particle size of no more than 5 mm to obtain an alloy mixture, wherein the mass ratio of Ru powder to titanium sponge in the alloy mixture is 1:20 to 1:50. This mixing process involves the diffusion and adsorption of the Ru powder in the titanium sponge. Due to the limited adsorption capacity of titanium sponge, the ratio of the two is controlled to avoid insufficient titanium sponge content, which prevents the remaining Ru powder from accumulating at the bottom, and to avoid excessive titanium sponge content, which hinders the diffusion of Ru powder and leads to uneven distribution.

[0014] The aforementioned method for preparing a corrosion-resistant Ti-Ru alloy sheet is characterized in that the layered laying process in step 2 comprises first laying a layer of titanium sponge with a particle size of 9.8 mm to 23.4 mm as a bottom layer, then laying a layer of alloy mixture as a middle layer on the bottom layer, and finally laying a layer of titanium sponge with a particle size of 9.8 mm to 23.4 mm as a top layer on the middle layer, with the layers being laid alternately in the order of titanium sponge, alloy mixture, and titanium sponge; the number of alternating layers being repeated is 3 to 5. Typically, the actual mass content of Ru in the alloy ingot deviates from the nominal mass content by no more than 5%.

[0015] The above-mentioned method for preparing a corrosion-resistant Ti-Ru alloy plate is characterized in that the temperature of the single-fire forging in step 3 is 200°C to 250°C higher than the phase transformation point, and the deformation of the single-fire forging is not less than 40%.

[0016] The above-mentioned method for preparing a corrosion-resistant Ti-Ru alloy plate is characterized in that the temperature of the second-fire forging in step four is 100°C to 150°C higher than the phase transformation point, and the deformation of the second-fire forging is not less than 30%; the temperature of the third-fire forging is 20°C to 50°C higher than the phase transformation point, and the deformation of the third-fire forging is not less than 30%.

[0017] The above-mentioned method for preparing a corrosion-resistant Ti-Ru alloy plate is characterized in that the two-fire forging and three-fire forging in step four are reversing three-upsetting and three-drawing, that is, the ingot is forged and deformed in one direction and then rotated 90°, deformed in the new direction and then rotated again 90°, and returned to the original direction after rotating and deforming three times.

[0018] The above-mentioned method for preparing a corrosion-resistant Ti-Ru alloy plate is characterized in that the temperature of the four-fire slab forging in step five is 10°C to 50°C lower than the phase transformation point, and the deformation of the four-fire slab forging is not less than 60%.

[0019] The above-mentioned method for preparing a corrosion-resistant Ti-Ru alloy plate is characterized in that the holding temperature of the multiple rolling passes in step six is ​​20°C to 50°C lower than the phase transformation point, and the deformation of a single rolling pass is 15% to 50%.

[0020] The above-mentioned method for preparing a corrosion-resistant Ti-Ru alloy plate is characterized in that the heat treatment temperature in step seven is 600° C. to 700° C., the heat treatment time is 30 min to 60 min, and the cooling method is air cooling.

[0021] The above-mentioned method for preparing a corrosion-resistant Ti-Ru alloy plate is characterized in that the room temperature tensile strength of the corrosion-resistant Ti-Ru alloy plate in step seven is above 490 MPa and the elongation is above 23%.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] 1. The present invention forms an alloy mixture by mixing Ru powder with sponge titanium with smaller particle size, and then distributes the alloy mixture in layers so that the alloy mixture is dispersed and wrapped in sponge titanium with larger particle size, and then presses and smelts to obtain an alloy ingot. This improves the distribution uniformity of Ru powder, effectively avoids metallurgical defects such as segregation and inclusion of high-melting-point, high-density Ru elements, lays the foundation for subsequent hot processing, and reduces the loss of Ru powder during the batching and electrode pressing process, thereby reducing the smelting cost.

[0024] 2. The present invention adopts multi-fire forging above the phase transformation point combined with a reversing upsetting process to avoid the occurrence of deformation dead zones during the forging process, thereby obtaining an alloy slab with uniform structure. By controlling the multi-fire forging temperature and deformation amount, the alloy slab structure is made more uniform and fine, thus avoiding defects such as cracking, curling and thickness deviation that are prone to occur during subsequent plate processing.

[0025] 3. The present invention effectively regulates the Ti-Ru alloy plate to obtain a composite structure consisting of a refined α-grain matrix and a nanoscale Ru-rich precipitate phase by controlling the holding temperature of multiple rolling passes and the deformation amount of single rolling passes, combined with a heat treatment system. While ensuring the excellent corrosion resistance of the Ti-Ru alloy plate, its mechanical properties are significantly improved. The room temperature tensile strength of the Ti-Ru alloy plate is above 490 MPa, and the elongation is above 23%.

[0026] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is the microstructure diagram of the corrosion-resistant Ti-0.08Ru alloy plate prepared in Example 1 of the present invention.

[0028] Figure 2 This is the morphology of Ru-rich nano-precipitates in the corrosion-resistant Ti-0.08Ru alloy plate prepared in Example 1 of the present invention.

[0029] Figure 3 This is the microstructure diagram of the corrosion-resistant Ti-0.086Ru alloy plate prepared in Example 2 of the present invention. DETAILED DESCRIPTION

[0030] Example 1

[0031] This embodiment includes the following steps:

[0032] Step 1: Using grade 0 titanium sponge and Ru powder with a purity of 99.90% by mass as raw materials, and preparing a total weight of 25 kg of raw materials according to the designed composition of the target product Ti-0.08Ru; the grade 0 titanium sponge includes grade 0 titanium sponge with a particle size of 9.8 mm to 23.4 mm and a particle size not exceeding 5 mm, and the particle size of the Ru powder does not exceed 50 μm; the designed composition of the target product Ti-0.08Ru is calculated by mass content: 0.08% Ru, and the rest is Ti;

[0033] Step 2: Partially mix, layer and press the raw materials prepared in step 1, and then perform vacuum consumable smelting three times to obtain an alloy ingot; the process of the partial mixing is: all the Ru powder and the grade 0 sponge titanium with a particle size not exceeding 5 mm are evenly mixed to obtain an alloy mixture, and the mass ratio of Ru powder to grade 0 sponge titanium in the alloy mixture is 1:20; the process of the layered laying is: first laying a layer of sponge titanium with a particle size of 9.8 mm to 23.4 mm as a bottom layer, then laying a layer of alloy mixture as an intermediate layer on the bottom layer, and then laying a layer of sponge titanium with a particle size of 9.8 mm to 23.4 mm on the intermediate layer as a top layer, and laying the sponge titanium-alloy mixture-sponge titanium in layers and alternatingly laying the materials in a pattern of sponge titanium-alloy mixture-sponge titanium, and the number of layered alternating laying is 3 layers;

[0034] Step 3: The alloy ingot obtained in step 2 is subjected to single-fire forging in a high-temperature single-phase region to obtain a single-fire forged ingot; the temperature of the single-fire forging is higher than the phase transition point by 250° C., the holding time is 100 minutes, and the deformation of the single-fire forging is 43%;

[0035] Step 4: The single-fire forging ingot obtained in step 3 is subjected to double-fire forging and triple-fire forging in a high-temperature single-phase region to obtain a triple-fire forging ingot; the temperature of the double-fire forging is 150°C higher than the phase transition point, the holding time is 90 minutes, and the deformation of the double-fire forging is 43%; the temperature of the triple-fire forging is 20°C higher than the phase transition point, the holding time is 90 minutes, and the deformation of the triple-fire forging is 35%; the double-fire forging and triple-fire forging are reverse three-upsetting and three-drawing, that is, the ingot is forged and deformed in one direction, then rotated 90°, deformed in the new direction, and rotated again 90°. After rotating and deforming three times, it returns to the original direction;

[0036] Step 5: The three-fire forging ingot obtained in step 4 is subjected to four-fire slab forging in the two-phase region to obtain an alloy slab; the temperature of the four-fire slab forging is 50° C. lower than the phase transition point, the holding time is 80 minutes, and the deformation of the four-fire slab forging is 66%;

[0037] Step 6: Grinding and repairing the surface of the alloy slab obtained in step 5, and then performing multiple-pass rolling on a reversible hot rolling mill to obtain an alloy plate; the holding temperature of the multiple-pass rolling is 20° C. lower than the phase transition point, the holding time is 40 minutes, and the deformation of a single-pass rolling is 15% to 30%;

[0038] Step 7: Straighten and heat treat the alloy plate obtained in step 6 to obtain a corrosion-resistant Ti-0.08Ru alloy plate; the heat treatment temperature is 670°C, the heat treatment time is 60 minutes, and the cooling method is air cooling; the room temperature tensile strength of the corrosion-resistant Ti-0.08Ru alloy plate is 497 MPa, and the elongation is 29%.

[0039] Figure 1 The microstructure of the corrosion-resistant Ti-0.08Ru alloy plate prepared in this embodiment is shown in FIG. Figure 2 The morphology of Ru-rich nano-precipitates in the corrosion-resistant Ti-0.08Ru alloy plate prepared in this embodiment is combined with Figure 1 and Figure 2 It can be seen that the α grain size in the Ti-0.08Ru alloy plate is about 10 μm, and a large number of uniform nanoscale Ru-rich precipitates are precipitated inside it, which is a typical microstructure with excellent corrosion resistance.

[0040] Example 2

[0041] This embodiment includes the following steps:

[0042] Step 1: Using grade 0 titanium sponge and Ru powder with a mass purity of 99.90% as raw materials, and preparing a total weight of 22 kg of raw materials according to the designed composition of the target product Ti-0.086Ru; the grade 0 titanium sponge includes grade 0 titanium sponge with a particle size of 9.8 mm to 23.4 mm and a particle size not exceeding 5 mm, and the particle size of the Ru powder does not exceed 50 μm; the designed composition of the target product Ti-0.086Ru is calculated by mass content: Ru 0.086%, and the remainder is Ti;

[0043] Step 2: Partially mix, layer and press the raw materials prepared in step 1, and then perform vacuum consumable smelting three times to obtain an alloy ingot; the process of the partial mixing is: all the Ru powder and the grade 0 sponge titanium with a particle size not exceeding 5 mm are evenly mixed to obtain an alloy mixture, and the mass ratio of Ru powder to grade 0 sponge titanium in the alloy mixture is 1:50; the process of the layered laying is: first laying a layer of sponge titanium with a particle size of 9.8 mm to 23.4 mm as a bottom layer, then laying a layer of alloy mixture as an intermediate layer on the bottom layer, and then laying a layer of sponge titanium with a particle size of 9.8 mm to 23.4 mm on the intermediate layer as a top layer, and laying the sponge titanium-alloy mixture-sponge titanium in layers and alternatingly laying the materials in a pattern of sponge titanium-alloy mixture-sponge titanium, and the number of layered alternating laying is 4 layers;

[0044] Step 3: The alloy ingot obtained in step 2 is subjected to single-fire forging in a high-temperature single-phase region to obtain a single-fire forged ingot; the temperature of the single-fire forging is 200° C. higher than the phase transition point, the holding time is 100 minutes, and the deformation of the single-fire forging is 41%;

[0045] Step 4: The single-fire forging ingot obtained in step 3 is subjected to double-fire forging and triple-fire forging in a high-temperature single-phase region to obtain a triple-fire forging ingot; the temperature of the double-fire forging is 100°C higher than the phase transition point, the holding time is 90 minutes, and the deformation of the double-fire forging is 36%; the temperature of the triple-fire forging is 30°C higher than the phase transition point, the holding time is 90 minutes, and the deformation of the triple-fire forging is 38%; the double-fire forging and triple-fire forging are reverse three-upsetting and three-drawing, that is, the ingot is forged and deformed in one direction, then rotated 90°, deformed in the new direction, and rotated again 90°, and returned to the original direction after being rotated and deformed three times;

[0046] Step 5: The three-fire forging ingot obtained in step 4 is subjected to four-fire slab forging in the two-phase region to obtain an alloy slab; the temperature of the four-fire slab forging is 30° C. lower than the phase transition point, the holding time is 85 minutes, and the deformation of the four-fire slab forging is 70%;

[0047] Step 6: Grinding and repairing the surface of the alloy slab obtained in step 5, and then performing multiple-pass rolling on a reversible hot rolling mill to obtain an alloy plate; the holding temperature of the multiple-pass rolling is 35° C. lower than the phase transition point, the holding time is 45 minutes, and the deformation of a single-pass rolling is 20% to 40%;

[0048] Step 7: Straighten and heat treat the alloy plate obtained in step 6 to obtain a corrosion-resistant Ti-0.086Ru alloy plate; the heat treatment temperature is 700°C, the heat treatment time is 45 minutes, and the cooling method is air cooling; the room temperature tensile strength of the corrosion-resistant Ti-0.086Ru alloy plate is 492 MPa, and the elongation is 29%.

[0049] Figure 3 The microstructure of the corrosion-resistant Ti-0.086Ru alloy plate prepared in this embodiment is as follows: Figure 3 It can be seen that the α matrix grains in the corrosion-resistant Ti-0.086Ru alloy plate are small and uniform in size.

[0050] Example 3

[0051] This embodiment includes the following steps:

[0052] Step 1: Using grade 0 titanium sponge and Ru powder with a purity of 99.90% by mass as raw materials, and preparing a total weight of 26 kg of raw materials according to the designed composition of the target product Ti-0.10Ru; the grade 0 titanium sponge includes grade 0 titanium sponge with a particle size of 9.8 mm to 23.4 mm and a particle size not exceeding 5 mm, and the particle size of the Ru powder does not exceed 50 μm; the designed composition of the target product Ti-0.10Ru is calculated by mass content: 0.10% Ru, and the remainder is Ti;

[0053] Step 2: Partially mix, layer and press the raw materials prepared in step 1, and then perform vacuum consumable smelting three times to obtain an alloy ingot; the process of the partial mixing is: all the Ru powder and the grade 0 sponge titanium with a particle size not exceeding 5 mm are evenly mixed to obtain an alloy mixture, and the mass ratio of Ru powder to grade 0 sponge titanium in the alloy mixture is 1:25; the process of the layered laying is: first laying a layer of sponge titanium with a particle size of 9.8 mm to 23.4 mm as a bottom layer, then laying a layer of alloy mixture as an intermediate layer on the bottom layer, and then laying a layer of sponge titanium with a particle size of 9.8 mm to 23.4 mm on the intermediate layer as a top layer, and laying the sponge titanium-alloy mixture-sponge titanium in layers and alternating layers according to the rule of sponge titanium-alloy mixture-sponge titanium, and the number of layered alternating layers is 3 layers;

[0054] Step 3: The alloy ingot obtained in step 2 is subjected to single-fire forging in a high-temperature single-phase region to obtain a single-fire forged ingot; the temperature of the single-fire forging is higher than the phase transition point of 215° C., the holding time is 100 minutes, and the deformation of the single-fire forging is 45%;

[0055] Step 4: The single-fire forging ingot obtained in step 3 is subjected to double-fire forging and triple-fire forging in a high-temperature single-phase region to obtain a triple-fire forging ingot; the temperature of the double-fire forging is 115°C higher than the phase transition point, the holding time is 90 minutes, and the deformation of the double-fire forging is 32%; the temperature of the triple-fire forging is 50°C higher than the phase transition point, the holding time is 90 minutes, and the deformation of the triple-fire forging is 36%; the double-fire forging and triple-fire forging are reverse three-upsetting and three-drawing, that is, the ingot is forged and deformed in one direction, then rotated 90°, deformed in the new direction, and rotated again 90°. After rotating and deforming three times, it returns to the original direction;

[0056] Step 5: The three-fire forging ingot obtained in step 4 is subjected to four-fire slab forging in the two-phase region to obtain an alloy slab; the temperature of the four-fire slab forging is 10° C. lower than the phase transition point, the holding time is 85 minutes, and the deformation of the four-fire slab forging is 63%;

[0057] Step 6: Grinding and repairing the surface of the alloy slab obtained in step 5, and then performing multiple-pass rolling on a reversible hot rolling mill to obtain an alloy plate; the holding temperature of the multiple-pass rolling is 50° C. lower than the phase transition point, the holding time is 45 minutes, and the deformation of the single-pass rolling is 25% to 50%;

[0058] Step 7: Straighten and heat treat the alloy plate obtained in step 6 to obtain a corrosion-resistant Ti-0.10Ru alloy plate; the heat treatment temperature is 600°C, the heat treatment time is 30 minutes, and the cooling method is air cooling; the room temperature tensile strength of the corrosion-resistant Ti-0.10Ru alloy plate is 510 MPa, and the elongation is 23%.

[0059] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent variation made to the above embodiment based on the essence of the invention technology shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A method for preparing a corrosion-resistant Ti-Ru alloy plate, characterized in that: The method comprises the following steps: Step 1: Using titanium sponge and Ru powder as raw materials, and mixing according to the designed composition of the target product; the titanium sponge includes titanium sponge with a particle size of 9.8 mm to 23.4 mm and a particle size not exceeding 5 mm, and the particle size of the Ru powder does not exceed 50 μm; the designed composition of the target product is calculated by mass content: Ru 0.08% to 0.1%, and the remainder is Ti; Step 2: Partially mix, layer and press the raw materials prepared in step 1, and then perform vacuum consumable smelting three times to obtain an alloy ingot; the process of the partial mixing is: all the Ru powder and sponge titanium with a particle size not exceeding 5 mm are evenly mixed to obtain an alloy mixture, and the mass ratio of Ru powder to sponge titanium in the alloy mixture is 1:20 to 1:50; the process of the layered laying is: first laying a layer of sponge titanium with a particle size of 9.8 mm to 23.4 mm as a bottom layer, then laying a layer of alloy mixture as an intermediate layer on the bottom layer, and then laying a layer of sponge titanium with a particle size of 9.8 mm to 23.4 mm as a top layer on the intermediate layer, and laying the sponge titanium in layers alternately according to the rule of sponge titanium-alloy mixture-sponge titanium; the number of layered alternating laying is 3 to 5 layers; Step 3: subjecting the alloy ingot obtained in step 2 to single-fire forging in a high-temperature single-phase region to obtain a single-fire forged ingot; Step 4: subjecting the single-fire forging ingot obtained in step 3 to two-fire forging and three-fire forging in a high-temperature single-phase region to obtain a three-fire forging ingot; Step 5: Forging the three-fire forged ingot obtained in step 4 into a four-fire slab in a two-phase region to obtain an alloy slab; Step 6: grinding and repairing the surface of the alloy slab obtained in step 5, and then performing multiple passes of rolling on a reversible hot rolling mill to obtain an alloy plate; Step 7: straighten and heat treat the alloy plate obtained in step 6 to obtain a corrosion-resistant Ti-Ru alloy plate.

2. The method for preparing a corrosion-resistant Ti-Ru alloy plate according to claim 1, characterized in that: The temperature of the first-fire forging in step 3 is 200° C. to 250° C. higher than the phase transformation point, and the deformation of the first-fire forging is not less than 40%.

3. The method for preparing a corrosion-resistant Ti-Ru alloy plate according to claim 1, characterized in that: The temperature of the second forging in step 4 is 100°C to 150°C higher than the phase transition point, and the deformation of the second forging is not less than 30%; the temperature of the third forging is 20°C to 50°C higher than the phase transition point, and the deformation of the third forging is not less than 30%.

4. The method for preparing a corrosion-resistant Ti-Ru alloy plate according to claim 1, characterized in that: The two-fire forging and three-fire forging in step 4 are three-upsetting and three-drawing with reversing direction, that is, the ingot is forged and deformed in one direction and then rotated 90°, deformed in the new direction and then rotated 90° again, and returned to the original direction after rotating and deforming three times.

5. The method for preparing a corrosion-resistant Ti-Ru alloy plate according to claim 1, characterized in that: The temperature of the four-fire slab forging in step 5 is 10°C to 50°C lower than the phase transformation point, and the deformation of the four-fire slab forging is not less than 60%.

6. The method for preparing a corrosion-resistant Ti-Ru alloy plate according to claim 1, characterized in that: The holding temperature of the multi-pass rolling in step 6 is 20° C. to 50° C. lower than the phase transition point, and the deformation of a single-pass rolling is 15% to 50%.

7. The method for preparing a corrosion-resistant Ti-Ru alloy plate according to claim 1, characterized in that: The heat treatment temperature in step seven is 600° C. to 700° C., the heat treatment time is 30 min to 60 min, and the cooling method is air cooling.

8. The method for preparing a corrosion-resistant Ti-Ru alloy plate according to claim 1, characterized in that: The room temperature tensile strength of the corrosion-resistant Ti-Ru alloy plate in step seven is greater than 490 MPa, and the elongation is greater than 23%.

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