Triple preparation method of high-uniformity low-cost high-molybdenum-equivalent titanium alloy

Abstract

The invention relates to a triple preparation method of a high-uniformity low-cost high-molybdenum-equivalent titanium alloy. The triple preparation method comprises the following steps: S1, providing a high-molybdenum-equivalent titanium alloy return furnace charge; s2, full-return furnace charge charging EBM smelting is carried out; s3, chemical components of the round ingot or the flat ingot are detected, and a primary ingot is obtained; s4, the primary ingot is subjected to SKM smelting, the new material is placed in a water-cooled copper crucible and smelted with the primary ingot, and a titanium alloy melt is obtained; s5, chemical components of the melt are detected, and the melt conforming to target components is cast to obtain a secondary ingot; s6, the secondary ingot is subjected to VAR smelting, and a tertiary ingot is obtained; and S7, repeating the step S6 for 0-2 times on the third ingot to obtain a finished ingot. High purity and low cost of the material are realized through primary smelting; the components are homogenized through secondary smelting; and internal defects are eliminated through third-time or multi-time smelting, so that the titanium alloy ingot is uniform in component and compact in structure, and the high-uniformity and low-cost titanium alloy ingot is obtained.

Description

Technical Field

[0001] This invention belongs to the field of smelting technology, and specifically discloses a three-stage preparation method for high-uniformity, low-cost, high-molybdenum-equivalent titanium alloys. Background Technology

[0002] High molybdenum equivalent titanium alloys include near-β titanium alloys (molybdenum equivalent 8-12), metastable β titanium alloys (molybdenum equivalent 10-25), and stable β titanium alloys (molybdenum equivalent above 25). They are the main titanium alloy materials used in high-strength, high-toughness, ultra-high-strength, and corrosion-resistant fields. Typical grades include Ti-10V-2Fe-3Al and Ti-5Al-5Mo-5V-3Cr high-strength and high-toughness near-β titanium alloys, Ti-3Al-8V-6Cr-4Mo-4Zr and Ti-15V-3Cr-3Sn-3Al metastable β titanium alloys, and Ti-32Mo and Ti-45Nb corrosion-resistant titanium alloys.

[0003] High molybdenum equivalent titanium alloys are rich in β-stabilizing elements such as Mo, Nb, V, Cr, and Fe. Their physical properties are shown in Table 1. Compared with the titanium matrix, they all have high density and / or high melting point characteristics.

[0004] Table 1

[0005] Currently, the industrial production of this type of titanium alloy adopts three-stage VAR melting. Due to the high alloy addition ratio, defects such as high-density inclusions and β-spot segregation are prone to occur in the metallurgical process. In order to eliminate the differences in physical properties of various high-content elements, the element materials are added in the form of intermediate alloys. By controlling the ingot size (within 3 tons) and process parameters, homogenization is achieved in the high-temperature, high-vacuum dynamic solidification process. However, this method still has problems such as high material cost, small ingot size, poor uniformity of single ingots and batch stability. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a three-stage preparation method for high-uniformity, low-cost, high-molybdenum-equivalent titanium alloys, thereby obtaining high-uniformity, low-cost, high-molybdenum-equivalent titanium alloy ingots.

[0007] The technical solution adopted in this invention is: A three-step preparation method for a high-uniformity, low-cost, high-molybdenum-equivalent titanium alloy, comprising the following steps: Step S1: Provide high molybdenum equivalent titanium alloy return charge that has been purified and has a clean surface; Step S2: The high molybdenum equivalent titanium alloy is fully returned to the furnace charge and then melted in a vacuum electron beam cold hearth furnace to obtain round or flat ingots. Step S3: Analyze the chemical composition of the round or flat ingots obtained in step S2 to obtain the primary ingot composition; Step S4: After flattening the head and tail of the primary ingot, load it into the furnace with the head facing down for vacuum consumable solidification furnace smelting. Before smelting, calculate the composition of the new material based on the target composition of the finished ingot and the composition of the primary ingot. Then, weigh the new material based on the calculated composition of the new material and place it in a water-cooled copper crucible to mix with the primary ingot to obtain titanium alloy melt. Step S5: Detect the chemical composition of the titanium alloy melt online, and cast the melt with chemical composition that matches the target composition of the finished ingot to obtain a secondary ingot; Step S6: After flattening the head and tail of the secondary ingot, load it into the furnace with the head facing down for vacuum consumable electric arc furnace melting to obtain the tertiary ingot. Step S7: Repeat step S6 0 to 2 times with the three ingots to obtain the finished ingot. Preferably, in the three-stage preparation method of high uniformity, low cost, and high molybdenum equivalent titanium alloy, in step S1, the high molybdenum equivalent titanium alloy return material is the same grade of return material, and the high molybdenum equivalent titanium alloy return material is selected from chip-shaped return material and block-shaped return material. The three dimensions of the block-shaped return material do not exceed 50-300 mm, and the three dimensions of the chip-shaped return material do not exceed 25.4 mm.

[0008] Preferably, in the three-stage preparation method of the high-uniformity, low-cost, high-molybdenum equivalent titanium alloy, the diameter of the round ingot in step S2 is Φ380~620mm, and the thickness of the flat ingot is 250~440mm.

[0009] Preferably, in the three-stage preparation method of the high-uniformity, low-cost, high-molybdenum equivalent titanium alloy, when the primary ingot in step S2 is a flat ingot, multiple square cross-section ingots are sawn along the width direction, with the maximum diagonal of the cross-section being 380–620 mm.

[0010] Preferably, in the three-stage preparation method of the high-uniformity, low-cost, high-molybdenum-equivalent titanium alloy, the new material in step S4 includes sponge titanium of the same grade and various corresponding intermediate alloys.

[0011] Preferably, in the three-stage preparation method for the high-uniformity, low-cost, high-molybdenum-equivalent titanium alloy, the calculation formula for the composition of the virgin material in step S4 is as follows: X1 i =(C0 i ×(W1+Wx1)-C1 i ×W1) / Wx1; where C0 i C1 is the target component of the finished ingot. i For primary ingot components, X1 i Wx1 represents the composition of the new material; W1 represents the weight of the new material; W1 represents the weight of the first ingot; and i represents different elements in the high molybdenum equivalent titanium alloy grade.

[0012] Preferably, the three-stage preparation method for the high-uniformity, low-cost, high-molybdenum equivalent titanium alloy includes the following steps in step S5: online detection of the chemical composition of the titanium alloy melt; if it meets the target composition of the finished ingot, it is cast into shape; if it does not meet the target composition of the finished ingot, secondary new material is added online until the chemical composition meets the target composition of the finished ingot.

[0013] Preferably, in the three-stage preparation method for the high-uniformity, low-cost, high-molybdenum equivalent titanium alloy, the calculation formula for the secondary virgin material is as follows: X2 i =(C0 i ×(W1+Wx1+Wx2)-C2 i ×(W1+Wx1)) / Wx2;where C2 i For online chemical composition detection in vacuum arc remelting furnace smelting; Wx2 is the weight of secondary virgin material; X2 i Secondary new material composition.

[0014] Preferably, in the triple preparation method for the high-uniformity, low-cost, high-molybdenum equivalent titanium alloy, the diameter of the triple ingot is Φ500~740mm.

[0015] Preferably, in the three-stage preparation method for the high-uniformity, low-cost, high-molybdenum equivalent titanium alloy, the melting power of the vacuum electron beam cold hearth furnace in step S2 is 1500kW to 3000kW, and the melting rate is 500kg / h to 1000kg / h; the melting power of the vacuum consumable solidification furnace in step S4 is 3000kW to 4500kW, and the melting rate is 2000kg / h to 3500kg / h; and the melting power of the vacuum consumable arc furnace in step S6 is 200kW to 1200kW, and the melting rate is 240kg / h to 1200kg / h.

[0016] The present invention has the following advantages: The present invention provides a three-stage preparation method for high-uniformity, low-cost, high-molybdenum-equivalent titanium alloys. This method effectively utilizes the first EBM melting process to return all the furnace charge, reducing material costs and achieving high material purity. The second SKM melting process replenishes the primary ingot with new material to adjust its chemical composition, ensuring the molten titanium alloy meets the target composition requirements. Further purification is achieved through the solidification of the solidified shell, resulting in homogenized material composition. Finally, a third or multiple VAR melting processes eliminate internal defects in the secondary ingot, achieving uniform material composition and a dense microstructure, thus obtaining a high-uniformity, low-cost, high-molybdenum-equivalent titanium alloy ingot. Attached Figure Description

[0017] Figure 1 This is a chemical composition diagram of a primary titanium alloy round ingot sample from Example 1 of the present invention.

[0018] Figure 2This is a chemical composition diagram of the finished ingot of Embodiment 1 of the present invention.

[0019] Figure 3 This is a chemical composition diagram of a primary titanium alloy round ingot sample from Example 2 of the present invention.

[0020] Figure 4 This is a chemical composition diagram of the finished ingot from Embodiment 2 of the present invention.

[0021] Figure 5 This is a chemical composition diagram of a primary titanium alloy round ingot sample from Example 3 of the present invention.

[0022] Figure 6 This is a chemical composition diagram of the finished ingot from Example 3 of the present invention. Detailed Implementation

[0023] The present invention will now be further described in detail with reference to the accompanying drawings and embodiments. Unless otherwise stated, the terminology used herein should be understood in accordance with the conventional usage of those skilled in the art.

[0024] Example 1 A three-stage preparation method for highly uniform and low-cost Ti-10V-2Fe-3Al titanium alloy involves a first EBM (Electronic Biomelting), a second SKM (Smelting Machine), and a third VAR (Vacuum Aluminum Refining) process to melt a 3-ton ingot with a diameter of 560mm. The steps are as follows: Step S1: Provide 2.1 tons of qualified Ti-10V-2Fe-3Al titanium alloy block return charge that has undergone purification treatment, is clean, dry, free of oxide layer and metallic and non-metallic foreign matter, and has a three-dimensional dimension of 100-200mm. Step S2: 2.1 tons of Ti-10V-2Fe-3Al titanium alloy block return charge are loaded into a frame for vacuum electron beam cold hearth furnace melting (EBM). The cold hearth structure is type C, the melting power is 1500kW, the melting rate is 500kg / h, and Φ440mm round ingots are obtained. The round ingots weigh 2 tons, the ingot drawing height is 3000mm, and each ingot is drawn 80mm. One sample is taken online, and a total of 37 samples are taken. Step S3: Analyze the chemical composition of 37 Ti-10V-2Fe-3Al titanium alloy round ingots from Step S2 (see...) Figure 1 The average contents of the main alloying elements Al, V, Fe, O, and N are calculated to obtain the primary ingot composition C1. i , i represents different elements such as Al, V, Fe, O, and N; Step S4: After leveling the head and tail of the ingot, load it head-down into the furnace for vacuum arc remelting (SKM). The melting power is 3000kW, and the melting rate is 2000kg / h. Before melting, pre-pile 1.5 tons of new material with the composition X1 in the melting crucible. iAfter smelting, before casting, an online sample is taken for online chemical composition analysis. The sample contains component C2. i Meets the target component C0 i The casting yielded Φ500mm round ingots, each weighing 3 tons, hereinafter referred to as secondary ingots; Where X1 i =(C0 i ×(2+1.5)-C1 i ×2) / 1.5, where i represents different elements Al, V, Fe, O, and N; New ingredient X1 Al 3.95%, X1 V 9.72%, X1 Fe 2.01%, X1 O 0.03%, X1 N : 0.02%; the remainder is titanium, the total of the above is 100%; among which, the new material is composed of 3-12.7mm small particles of grade 0 sponge titanium and several intermediate alloys of vanadium aluminum iron, vanadium aluminum, aluminum iron and aluminum briquettes; Step S5: After the second ingot is flattened at both ends, it is loaded into the furnace with the head facing down for vacuum self-consuming electric arc furnace melting (VAR). The melting power is 300kW and the melting rate is 360kg / h, resulting in a Φ560mm round ingot with a single ingot weight of 3 tons, which is referred to as the third ingot. Step S6: According to the requirements of the application field, the third-stage ingot is a finished ingot, and the ingot composition is as follows: Figure 2 .

[0025] Figure 1 C1 Al 2.46%, R Al : 0.56%; C1 V 10.21%, R V : 0.9%; C1 Fe 1.61%, R Fe : 0.29%; C1 O 0.16%, R O : 0.04%; C1 N 0.02%, R N 0.03%; the remainder is titanium, and the total is 100%.

[0026] Figure 2 C Al 3.01%, R Al : 0.1%; C V 10.05%, R V : 0.22%; C Fe 1.72%, R Fe : 0.08%; C O 0.11%, R O: 0.02%; C N 0.02%, R N 0.01%; the remainder is titanium, and the total is 100%.

[0027] Depend on Figure 1 and Figure 2 The mean and range of the composition show that after the ingot is smelted in three stages, the range of Al, V and Fe elements does not exceed 0.3%, the range of impurity elements does not exceed 0.03%, and the composition uniformity is good.

[0028] Example 2 A three-stage preparation method for high-uniformity, low-cost Ti-45Nb titanium alloy involves a first EBM (Electronic Biomelting), a second SKM (Signal Smelting), and a third VAR (Vacuum Aluminum Refining) process for smelting a 3-ton ingot with a diameter of 500mm. The steps are as follows: Step S1: Provide 3.1 tons of qualified Ti-45Nb titanium alloy block return charge that has undergone purification treatment, is clean, dry, free of oxide layer and metallic and non-metallic foreign matter, and has a three-dimensional dimension of 50-100mm. Step S2: 3.1 tons of Ti-45Nb titanium alloy blocks were returned to the furnace charge and loaded into a frame for EBM horizontal melting. The cooling bed structure was C-type, the melting power was 2000kW, and the melting rate was 800kg / h, resulting in Φ380mm round ingots, hereinafter referred to as primary ingots. The primary ingot weighed about 3 tons, and the ingot pulling height was 4500mm. One sample was taken online for every 100mm of ingot pulling, for a total of 44 samples.

[0029] Step S3: Analyze the chemical composition of 44 samples of Ti-45Nb titanium alloy primary ingots from Step S2 (see...). Figure 3 ), calculate the average content of the main alloying elements Nb, Ti, O, and N to obtain the primary ingot composition C1. i , where i represents different elements Nb, O, and N; Step S4: After leveling the ingot head and tail once, load it into the furnace head-down for SKM smelting. The smelting power is 4200kW, and the melting rate is 3200kg / h. Before smelting, pre-spread 0.5 tons of new material in the smelting crucible. The composition of the new material is X1. i After smelting, before casting, an online sample is taken and its chemical composition is analyzed online. Component C2 i Meets the target component C0 i The casting yielded Φ440mm round ingots, each weighing 3 tons, hereinafter referred to as secondary ingots; Where X1 i =(C0 i ×(3+0.5)-C1 i ×3) / 0.5, where i represents different elements Nb, O, and N; New ingredient X1 Nb 31.14%, X1 O0.02%, X1 N 0.02%; the remainder is titanium, and the total is 100%.

[0030] The new material is composed of a uniform mixture of high-purity sponge titanium and high-purity niobium strips; Step S5: After the second ingot is flattened at both ends, it is loaded into the furnace with the head facing down for VAR melting. The melting power is 800kW and the melting rate is 800kg / h, resulting in a Φ500mm round ingot with a single ingot weight of 3 tons, which is referred to as the third ingot. Step S6: According to the requirements of the application field, the third-stage ingot is a finished ingot, and the ingot composition is as follows: Figure 4 .

[0031] Figure 3 C1 Nb 47.31%, R Nb : 4.1%; C1 O 0.09%, R O : 0.05%; C1 N 0.02%, R N 0.02%; the remainder is titanium, and the total is 100%.

[0032] Figure 4 C Nb 46.0%, R Nb : 0.8%; C O 0.06%, R O : 0.01%; C N 0.01%, R N 0.01%; the remainder is titanium, and the total is 100%. (From...) Figure 3 and Figure 4 The mean and range of the composition show that after the ingot is smelted in three stages, the Nb element range is 0.8%, the impurity element range is no more than 0.03%, and the composition uniformity is good.

[0033] Example 3 A three-stage preparation method for highly uniform and low-cost Ti-15V-3Cr-3Sn-3Al titanium alloy involves a first EBM (Electronic Biomelting), a second SKM (Smelting Machine), and a third VAR (Vacuum Aluminum Refining) process for smelting a 6-ton ingot with a diameter of 680mm. The steps are as follows: Step S1: Provide 3.6 tons of qualified Ti-15V-3Cr-3Sn-3Al titanium alloy block return material and 0.5 tons of chip return material that have undergone purification treatment, are clean, dry, free of oxide layer and metallic and non-metallic foreign matter, with the three-dimensional dimensions of the block return material being 200-300 mm and the three-dimensional dimensions of the chip return material being 25.4 mm. Step S2: 4.1 tons of Ti-15V-3Cr-3Sn-3Al titanium alloy were returned to the furnace charge for EBM horizontal melting. The cooling bed structure was C-type, the melting power was 2400kW, and the melting rate was 850kg / h, resulting in Φ500mm round ingots, hereinafter referred to as primary ingots. The primary ingot weighed about 4 tons, and the ingot pulling height was 4500mm. One sample was taken online for every 100mm of ingot pulling, for a total of 44 samples.

[0034] Step S3: Analyze the chemical composition of 44 samples of Ti-15V-3Cr-3Sn-3Al titanium alloy primary ingots from Step S2 (see...). Figure 5 ), calculate the average content of the main alloying elements Al, V, Sn, Cr, Fe, O, and N to obtain the primary ingot composition C1. i , i represents different elements such as Al, V, Sn, Cr, Fe, O, and N; Step S4: After leveling the ingot head and tail once, load it head-down into the furnace for SKM smelting. The smelting power is 3500 kW, and the melting rate is 2500 kg / h. Before smelting, pre-pile 2 tons of new material in the smelting crucible. The composition of the new material is X1. i After smelting, before casting, an online sample is taken and its chemical composition is analyzed online. Component C2 i Does not meet the target component C0 i Online replenishment of some new material, weight Wx2; its composition is X2 i The casting yielded Φ560mm round ingots, each weighing 6 tons, hereinafter referred to as secondary ingots; Where X1 i =(C0 i ×(4+2)-C1 i ×4) / 2, where i represents different elements Al, V, Fe, O, and N; First new material composition X1 Al 4.32%, X1 V 14.12%, X1 Sn 3.47%, X1 Cr 3.76%, X1 Fe 0.03%, X1 O 0.04%, X1 N 0.02%; the remainder is titanium, and the total is 100%. Where X2 i =(C0 i ×(4+2+Wx2)-C2 i ×(4+2)) / Wx2.

[0035] C2 Al 2.9% does not meet the target component of 3.1%, therefore the second batch of new material component X1 Al 1.2%; The new material is composed of several uniformly mixed intermediate alloys such as 3-12.7mm small particles of grade 0 sponge titanium and aluminum vanadium tin chromium, vanadium aluminum, titanium tin, metallic chromium, and aluminum briquettes. Step S5: After the second ingot is flattened at both ends, it is loaded into the furnace with the head facing down for VAR melting. The melting power is 700kW and the melting rate is 780kg / h, resulting in a Φ620mm round ingot with a single ingot weight of 6 tons, which is referred to as the third ingot. Step S6: Repeat step S5 three times with a melting power of 850kW and a melting rate of 900kg / h to obtain a 6-ton finished ingot with a diameter of 680mm. The ingot composition is as follows. Figure 6 .

[0036] Figure 5 C1 Al 2.49%, R Al : 0.39%; C1 V 15.44%, R V 1.4%; C1 Sn 2.84%, R Sn : 0.28%; C1 Cr 2.77%, R Cr : 0.29%; C1 Fe 0.03%, R Fe : 0.03%; C1 O 0.1%, R O : 0.05%; C1 N 0.02%, R N 0.03%; the remainder is titanium, and the total is 100%. Figure 6 C Al 3.04%, R Al : 0.13%; C V 15.18%, R V : 0.5%; C Sn 2.98%, R Sn : 0.07%; C Cr 2.99%, R Cr : 0.14%; C Fe 0.02%, R Fe : 0.01%; C O 0.07%, R O : 0.01%; C N 0.02%, R N 0.01%; the remainder is titanium, and the total is 100%.

[0037] Depend on Figure 5 and Figure 6The mean and range of the composition show that after the ingot is smelted in three stages, the range of V element is 0.5%, the range of Al, Sn and Cr element does not exceed 0.2%, the range of impurity element does not exceed 0.03%, and the composition uniformity is good.

[0038] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A three-stage preparation method for a high-uniformity, low-cost, high-molybdenum-equivalent titanium alloy, characterized in that, The preparation method includes the following steps: Step S1: Provide high molybdenum equivalent titanium alloy return charge that has been purified and has a clean surface; Step S2: The high molybdenum equivalent titanium alloy is fully returned to the furnace charge and then melted in a vacuum electron beam cold hearth furnace to obtain round or flat ingots. Step S3: Analyze the chemical composition of the round or flat ingots obtained in step S2 to obtain the primary ingot composition; Step S4: After flattening the head and tail of the primary ingot, load it into the furnace with the head facing down for vacuum consumable solidification furnace smelting. Before smelting, calculate the composition of the new material based on the target composition of the finished ingot and the composition of the primary ingot. Then, weigh the new material based on the calculated composition of the new material and place it in a water-cooled copper crucible to mix with the primary ingot to obtain titanium alloy melt. Step S5: Detect the chemical composition of the titanium alloy melt online, and cast the melt with chemical composition that matches the target composition of the finished ingot to obtain a secondary ingot; Step S6: After flattening the head and tail of the secondary ingot, load it into the furnace with the head facing down for vacuum consumable electric arc furnace melting to obtain the tertiary ingot; Step S7: Repeat step S6 0 to 2 times with the three ingots to obtain the finished ingot.

2. The three-stage preparation method for high-uniformity, low-cost, high-molybdenum equivalent titanium alloy as described in claim 1, characterized in that, In step S1, the high molybdenum equivalent titanium alloy return material is the same grade of return material. The high molybdenum equivalent titanium alloy return material is selected from chip return material and block return material. The three dimensions of the block return material do not exceed 50-300 mm, and the three dimensions of the chip return material do not exceed 25.4 mm.

3. The three-stage preparation method for high-uniformity, low-cost, high-molybdenum equivalent titanium alloy as described in claim 1, characterized in that, In step S2, the diameter of the round ingot is Φ380~620mm, and the thickness of the flat ingot is 250~440mm.

4. The three-stage preparation method for high-uniformity, low-cost, high-molybdenum equivalent titanium alloy as described in claim 3, characterized in that, In step S2, when the ingot is a flat ingot, multiple square cross-section ingots are sawn along the width direction, with the maximum diagonal of the cross-section being 380-620mm.

5. The three-stage preparation method for high-uniformity, low-cost, high-molybdenum equivalent titanium alloy as described in claim 1, characterized in that, The new materials in step S4 include sponge titanium of the same grade and various corresponding intermediate alloys.

6. The three-stage preparation method for high-uniformity, low-cost, high-molybdenum equivalent titanium alloy as described in claim 5, characterized in that, The formula for calculating the composition of the new material in step S4 is: X1 i =(C0 i ×(W1+Wx1)-C1 i ×W1) / Wx1; where C0 i C1 is the target component of the finished ingot. i For primary ingot components, X1 i Wx1 represents the composition of the new material; W1 represents the weight of the new material; W1 represents the weight of the first ingot; and i represents different elements in the high molybdenum equivalent titanium alloy grade.

7. The three-stage preparation method for high-uniformity, low-cost, high-molybdenum equivalent titanium alloy as described in claim 1, characterized in that, Step S5 specifically includes the following steps: online testing of the chemical composition of the titanium alloy molten metal; if it meets the target composition of the finished ingot, it is cast into shape; if it does not meet the target composition of the finished ingot, secondary new material is added online until the chemical composition meets the target composition of the finished ingot.

8. The three-stage preparation method for high-uniformity, low-cost, high-molybdenum equivalent titanium alloy as described in claim 7, characterized in that, The formula for calculating secondary new materials is: X2 i =(C0 i ×(W1+Wx1+Wx2)-C2 i ×(W1+Wx1)) / Wx2;where C2 i For online chemical composition detection in vacuum arc remelting furnaces; Wx2 is the weight of the secondary virgin material; X2 i Secondary new material composition.

9. The three-stage preparation method for high-uniformity, low-cost, high-molybdenum equivalent titanium alloy as described in claim 1, characterized in that, The diameter of the tertiary ingot is Φ500~740mm.

10. The three-stage preparation method for high-uniformity, low-cost, high-molybdenum equivalent titanium alloy as described in claim 1, characterized in that, In step S2, the melting power of the vacuum electron beam cold hearth furnace is 1500kW to 3000kW, and the melting rate is 500kg / h to 1000kg / h; in step S4, the melting power of the vacuum consumable shell furnace is 3000kW to 4500kW, and the melting rate is 2000kg / h to 3500kg / h; in step S6, the melting power of the vacuum consumable arc furnace is 200kW to 1200kW, and the melting rate is 240kg / h to 1200kg / h.

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