Low-cost process for preparing ta4 titanium alloy strip
By combining electron beam cold hearth melting and large integral milling machine processing with optimized rolling and heat treatment processes, the problems of strip breakage and rib formation in the preparation of TA4 titanium alloy strip have been solved, achieving stable production with low cost and high quality.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- LUOYANG SUNRUI TI PRECISION CASTING
- Filing Date
- 2025-11-21
- Publication Date
- 2026-07-02
AI Technical Summary
TA4 titanium alloy strip is prone to breakage and rib formation during the manufacturing process, resulting in poor finished product quality and high production costs.
TA4 flat ingots were prepared using an electron beam cold hearth melting furnace, and slabs were machined using a large integral cutter head milling machine. By controlling parameters such as rolling deformation, pass deformation, tension, and rolling speed, the heat treatment process was optimized, including edge trimming and tension straightening, to reduce metallurgical defects and improve slab shape.
Stable production of TA4 titanium alloy strip has been achieved, production costs have been reduced, finished product quality has been improved, strip breakage and rib formation problems have been avoided, and it possesses excellent mechanical properties.
Smart Images
Figure PCTCN2025136644-APPB-I100001
Abstract
Description
A low-cost manufacturing process for TA4 titanium alloy strip Technical Field
[0001] This invention relates to the field of titanium alloy strip preparation technology, and in particular to a low-cost TA4 titanium alloy strip preparation process. Background Technology
[0002] TA4 titanium alloy possesses excellent corrosion resistance and specific strength, making it promising for applications in 3C electronics, petrochemicals, medical, aerospace, and shipbuilding and marine engineering. Currently, TA4 titanium alloy coils are primarily manufactured through VAR melting, forging, and rolling of slabs, a process characterized by long production cycles and high costs. Furthermore, the cold-rolled TA4 titanium alloy strip rolling process is highly susceptible to abnormalities such as strip breakage and rib formation, leading to coil scrapping. Therefore, stable mass production of TA4 titanium alloy coils is difficult to achieve.
[0003] In 2020, the applicant filed patent application CN112122382A, which describes a process for preparing wide-width ultra-thin cold-rolled titanium strip coils for rolling composites. This method innovates and optimizes process routes and parameters, including composition design, slab preparation, cold rolling, heat treatment, and leveling. The slab is prepared using EB furnace mold casting of flat ingots, and the surface is machined using a large integral cutter head. After cold rolling, the strip undergoes edge trimming followed by annealing. The finished product rolling stage employs low-tension rolling control, and the finished product undergoes heat treatment using a long-term heat treatment method with furnace cooling hood. A rolling leveling method is selected to further improve the strip shape after annealing. The prepared cold-rolled titanium strip coils have a width exceeding 1000mm, a thickness of 0.1~0.3mm, a straight shape, excellent comprehensive mechanical properties, and a high rate of composite with dissimilar metals, while significantly reducing the cost of titanium in composite materials. However, CN112122382A applies to TA1 grade titanium alloys. TA4 titanium alloy has higher strength, exceeding that of TA1 titanium coils by 300-500 MPa. If the manufacturing process described in CN112122382A is directly used to prepare TA4 titanium alloy strip, strip breakage and rib formation are likely to occur, resulting in poor product quality. Summary of the Invention
[0004] In view of this, the present invention aims to propose a low-cost TA4 titanium alloy strip preparation process to solve the problems of strip breakage and rib formation that easily occur during the preparation of TA4 titanium alloy strip.
[0005] To achieve the above objectives, the technical solution of the present invention is implemented as follows:
[0006] A low-cost process for preparing TA4 titanium alloy strip includes the following steps:
[0007] Step 1: Prepare TA4 flat ingots using electron beam cold hearth furnace casting method. The obtained flat ingots have a width ≥1000mm and a thickness of 170~220mm. Use a large integral milling machine to perform integral machining on the upper and lower surfaces of the ingots to obtain slabs.
[0008] Step 2: TA4 strip is rolled using a hot rolling mill. The billet is heated to 800~950℃. The slab is rolled by a roughing mill and a finishing mill to obtain a titanium alloy hot-rolled coil.
[0009] Step 3: Roll the hot coil to 3.0~3.8mm using a six-roll mill. Then, anneal and remove oxide scale from the titanium coil using a continuous annealing, shot blasting and pickling line. The heat treatment annealing temperature is 700~800℃.
[0010] Step 4: Trim the edges on both sides. After trimming, roll the titanium coil to 1.8~2.5mm using a 20-roll mill. The deformation during rolling is 16~55%, and the deformation per pass is ≤15%. Heat treat the titanium coil using a continuous annealing, shot blasting and pickling line. The heat treatment annealing temperature is 700~800℃.
[0011] Step 5: Trim both sides. After trimming, roll the titanium coil to 0.7~1.2mm using a 20-roll mill. The deformation during rolling is 33~70%, and the deformation per pass is ≤10%. Heat treat the titanium coil in a bell-type annealing furnace at a temperature of 600~680℃.
[0012] Step 6: Trim both sides, then roll the finished product using a 20-roll mill. The rolling deformation is 20-30%, the target thickness is 0.4-0.5 mm, the deformation per pass is ≤7%, and the tension is 25-75 kg / mm. 2 Rolling speed 30~60m / min;
[0013] Step 7: Heat-treat the cold-rolled titanium strip coils using a protective atmosphere annealing furnace at a temperature of 600~680℃ and a holding time of 7~12h.
[0014] Step 8: Use a tension bending straightening machine to straighten the finished titanium coil with an elongation of 0.5~1.0%.
[0015] Furthermore, in step one, when using an electron beam cold hearth melting furnace (EB furnace), sponge titanium, titanium dioxide and titanium-iron alloy are selected to be pressed into briquettes as briquettes. The melting electron gun current is 5.0~15.0A and the melting rate is 300~1200kg / h.
[0016] Furthermore, in step one, the cutter diameter of the large integral cutter milling machine is greater than the width of the slab, which is 1300~1500mm, the single-sided milling thickness is ≥3mm, and the thickness difference of the slab cross section after machining is ≤3mm.
[0017] Furthermore, in step one, the mass percentage of impurity elements Fe in the composition of the slab is controlled to be ≤0.50%, C ≤0.20%, N ≤0.10%, and O ≤0.40%.
[0018] Furthermore, in step one, an anti-oxidation coating is applied to the upper and lower surfaces and sides of the slab.
[0019] Furthermore, the thickness of the anti-oxidation coating is 0.3~1.0 mm.
[0020] Furthermore, in step two, the roughing thickness is 30~60mm and the deformation rate per pass is ≤35%, and the finishing thickness is 4~6mm and the deformation rate per pass is ≤30%.
[0021] Furthermore, in step three, the deformation during rolling is 20-50%, and the deformation rate per pass is ≤15%.
[0022] Furthermore, in steps four, five, and six, when cutting the edges on both sides, the width of the cut edge on one side should be ≥5mm.
[0023] Compared with existing technologies, the low-cost TA4 titanium alloy strip preparation process described in this invention has the following advantages:
[0024] (1) When rolling finished products, by controlling the rolling deformation amount, rolling target thickness, pass deformation amount, tension and rolling speed, the unevenness of rolling deformation is reduced, the plate shape is improved and optimized, and ribs are avoided, thus achieving stable production of TA4 titanium alloy strip.
[0025] (2) Using an EB furnace with refining function to prepare slabs can significantly reduce defects such as inclusions and holes in TA4 titanium alloy strip products caused by metallurgical quality problems, and obtain strips with beautiful surface quality.
[0026] (3) Edge cutting is used before each cold rolling process to eliminate edge crack defects and reduce the risk of cold rolling strip breakage in finished products. Detailed Implementation
[0027] The present invention will be further described below with reference to specific embodiments. First, it should be noted that the data in the following experimental examples were obtained by the inventors through numerous experiments. Due to space limitations, only a portion of these data is shown in the specification, and those skilled in the art can understand and implement the present invention based on this data. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the contents of this invention, those skilled in the art can make various modifications or alterations to the invention, and these modifications or alterations also fall within the scope of protection of this application.
[0028] A low-cost preparation process for TA4 titanium alloy strip includes the following steps:
[0029] Step 1: Prepare TA4 flat ingots using electron beam cold hearth furnace casting method. The obtained flat ingots have a width ≥1000mm and a thickness of 170~220mm. Use a large integral milling machine to perform integral machining on the upper and lower surfaces of the ingots to obtain slabs.
[0030] Specifically, in step one, when using an electron beam cold hearth melting furnace (EB furnace), sponge titanium, titanium dioxide and titanium-iron alloy are selected to be pressed into briquettes as briquettes. The melting electron gun current is 5.0~15.0A and the melting rate is 300~1200kg / h.
[0031] The large integral milling machine has a cutter diameter greater than the slab width, which is 1300-1500 mm. The single-sided milling thickness is ≥3 mm, and the thickness difference of the slab cross-section after machining is ≤3 mm. Specifically, in this invention, the model of the large integral milling machine is ZGTX1.
[0032] Furthermore, after obtaining the slab, an anti-oxidation coating is applied to the upper and lower surfaces and sides of the slab. The anti-oxidation coating comprises glass powder, a binder, and water, and the coating thickness is 0.3~1.0 mm. Since the anti-oxidation coating is existing technology, it will not be described in detail here. Applying an anti-oxidation coating to the surface of the slab helps improve the surface quality of the titanium coil.
[0033] Regarding the composition of the slab, the mass percentage of impurity elements Fe is ≤0.50%, C is ≤0.20%, N is ≤0.10%, and O is ≤0.40%. By controlling the composition of Fe, O, C, and N impurity elements, and by using a long-term heat treatment method with furnace cooling in the subsequent preparation process for the finished product heat treatment, it is beneficial to reduce the strength of the titanium strip, increase its elongation, and give it excellent mechanical properties.
[0034] In step one of this invention, slabs are prepared by casting flat ingots in an EB furnace. The EB furnace has the advantages of high melting vacuum, large superheat, and good removal of high and low density inclusions. Using an EB furnace, which has a refining function, to prepare slabs can significantly reduce defects such as inclusions and voids in the finished TA4 titanium alloy strip caused by metallurgical quality issues, resulting in strips with aesthetically pleasing surface quality. Furthermore, using EB flat ingots for single-stage melting as raw material, compared with traditional two or three VAR melting processes and multi-fire forging and grinding to manufacture slabs, reduces production steps, increases yield, and lowers billet production costs by more than 20%, thus contributing to the reduction of titanium strip production costs.
[0035] The EB furnace, combined with a large integral cutter head, processes the upper and lower surfaces of the ingot. Compared with the traditional VAR melting round ingot forging slab processing method with a small cutter head, the slab size is more regular, the surface thickness difference is not affected by the cutter joint, and the cross-sectional thickness is uniform. This can significantly reduce the risk of plate shape defects such as edge waves, rib waves, and middle waves in thin strip finished products caused by uneven slab thickness, and reduce the risk of rib formation and strip breakage during finished product rolling.
[0036] Step 2: TA4 strip is rolled using a hot rolling mill. The billet is heated to 800~950℃. The slab is rolled by a roughing mill and a finishing mill to obtain a titanium alloy hot-rolled coil.
[0037] Specifically, in step two, the roughing thickness is 30~60mm and the deformation rate per pass is ≤35%, and the finishing thickness is 4~6mm and the deformation rate per pass is ≤30%.
[0038] Step 3: Roll the hot coil to 3.0~3.8mm using a six-roll mill. Then, anneal and remove oxide scale from the titanium coil using a continuous annealing, shot blasting and pickling line. The heat treatment annealing temperature is 700~800℃.
[0039] Specifically, in step three, the deformation during rolling is 20-50%, and the deformation rate per pass is ≤15%.
[0040] Step 4: Trim the edges on both sides. After trimming, roll the titanium coil to 1.8~2.5mm using a 20-roll mill. The deformation during rolling is 16~55%, and the deformation per pass is ≤15%. Heat treat the titanium coil using a continuous annealing, shot blasting and pickling line. The heat treatment annealing temperature is 700~800℃.
[0041] Step 5: Trim both sides. After trimming, roll the titanium coil to 0.7~1.2mm using a 20-roll mill. The deformation during rolling is 33~70%, and the deformation per pass is ≤10%. Heat treat the titanium coil in a bell-type annealing furnace at a temperature of 600~680℃.
[0042] Step 6: Trim both sides, then roll the finished product using a 20-roll mill. The rolling deformation is 20-30%, the target thickness is 0.4-0.5 mm, the deformation per pass is ≤7%, and the tension is 25-75 kg / mm. 2 Rolling speed 30~60m / min;
[0043] Specifically, the main causes of rib formation are unstable rolling and uneven rolling deformation. Slight deviation or tilting of the titanium strip during rolling causes rib formation. On the other hand, deterioration of the titanium strip shape and excessive tension also contribute to rib formation. In step six, to avoid rib formation in the finished product rolling process, a smaller finished product rolling deformation amount, a smaller number of passes, low tension, and slow rolling speed are used in the finished product cold rolling stage. The smaller finished product rolling deformation amount reduces uneven rolling deformation; the smaller number of passes improves and optimizes the strip shape; slow rolling prevents titanium strip deviation and tilting; and low tension rolling avoids rib formation caused by excessive tension. This invention, through reasonable control of rolling deformation amount, pass deformation amount, tension, and rolling speed, ultimately achieves stable production of TA4 titanium alloy strip and significantly improves the rib formation problem of the finished titanium alloy strip, resulting in better finished product quality.
[0044] Step 7: Heat-treat the cold-rolled titanium strip coils using a protective atmosphere annealing furnace at a temperature of 600~680℃ and a holding time of 7~12h.
[0045] Step 8: Use a tension bending straightening machine to straighten the finished titanium coil with an elongation of 0.5~1.0%.
[0046] As a preferred example of the present invention, in steps four, five, and six, when trimming the edges on both sides, the width of the trimmed edge on one side is ≥5mm. The main cause of strip breakage during TA4 titanium coil rolling is edge cracking. The present invention performs edge trimming of the titanium coil before each cold rolling process to eliminate the risk of strip breakage caused by edge cracking during cold rolling.
[0047] This invention discloses a low-cost preparation process for TA4 titanium alloy strip. It employs a single-stage EB melting process to prepare TA4 slabs from flat ingots, shortening the slab preparation process and reducing the cost of TA4 strip. The surface quality of the titanium coil is improved by applying an anti-oxidation coating to the slab surface and optimizing the hot rolling process. Simultaneously, by optimizing composition design, pre-rolling edge trimming, and parameter control during the finished product cold rolling stage, technical problems such as strip breakage and rib formation in TA4 strip rolling are solved. The prepared TA4 titanium alloy coil exhibits excellent performance, high yield, and low production cost, with widths exceeding 1000 mm and thicknesses of 0.4~0.5 mm, showing broad application prospects. Sampling and inspection of the finished coils obtained using this invention's preparation process show that the strip shape meets the requirement of ≤5 mm / m and the yield strength (R... P0.2 It meets the requirements of 485~655MPa and elongation A meets the requirement of ≥20%.
[0048] Example 1
[0049] Step 1: TA4 flat ingots were prepared using the EB furnace casting method. Sponge titanium, titanium dioxide, and titanium alloy were selected for briquette preparation as briquettes. The melting electron gun current was 8.0A, and the melting rate was 1000 kg / h. The obtained flat ingots had a width of 1280 mm and a thickness of 190 mm. The upper and lower surfaces of the ingots were machined using a ZGTX1 type integral milling machine with a cutter head diameter greater than the slab width. The single-sided milling thickness was 5 mm, resulting in a 1 mm difference in cross-sectional thickness after machining. A 0.5 mm anti-oxidation coating was applied to the upper, lower, and side surfaces of the slab. The mass percentages of Fe, C, N, and O impurities in the titanium slab were 0.30%, 0.08%, 0.01%, and 0.35%, respectively.
[0050] Step 2: TA4 strip is rolled using a hot rolling mill. The billet is heated to 900℃. The slab is rolled by a roughing mill and a finishing mill to obtain a titanium alloy hot-rolled coil. The roughing thickness is 30mm and the deformation rate per pass is ≤35%. The finishing thickness is 4mm and the deformation rate per pass is ≤30%.
[0051] Step 3: Use a six-roll mill to roll the hot coil to 3.0mm, with a rolling deformation of 25% and a pass deformation rate of ≤15%. Use a continuous annealing, shot blasting and pickling line to anneal and remove oxide scale from the titanium coil. The heat treatment annealing temperature is 750℃.
[0052] Step 4: Trim both sides, with a single side trimming width of 10mm. After trimming, roll the titanium coil to 2.0mm using a 20-roll mill, with a rolling deformation of 33.3% and a pass deformation of ≤15%. Then, heat treat the titanium coil using a continuous annealing, shot blasting, and pickling line at a annealing temperature of 800℃.
[0053] Step 5: Trim both sides, with a single side trimming width of 10mm. After trimming, roll the titanium coil to 0.7mm using a 20-roll mill, with a rolling deformation of 65% and a pass deformation of ≤10%. Then, heat treat the titanium coil in a bell-type annealing furnace at a temperature of 650℃.
[0054] Step 6: Trim both sides, with a single side trimming width of 10mm. After trimming, use a 20-roll mill for finished product rolling, with a deformation per pass ≤7% and a tension of 50kg / mm. 2 The rolling speed is 40 m / min, the rolling deformation is 28.5%, and the target rolling thickness is 0.5 mm.
[0055] Step 7: Heat-treat the cold-rolled titanium strip coils using a protective atmosphere annealing furnace at a temperature of 650℃ and a holding time of 10 hours.
[0056] Step 8: Use a tension bending straightening machine to straighten the finished titanium coil with an elongation of 1.0%.
[0057] Example 2
[0058] Step 1: TA4 flat ingots were prepared using the EB furnace casting method. Sponge titanium, titanium dioxide, and titanium alloy were selected for briquette preparation as briquettes. The melting electron gun current was 15.0A, and the melting rate was 1200 kg / h. The obtained flat ingots had a width of 1060 mm and a thickness of 200 mm. The upper and lower surfaces of the ingots were machined using a ZGTX1 type integral milling machine with a cutter head diameter greater than the slab width. The single-sided milling thickness was 3 mm, resulting in a 3 mm thickness difference across the slab cross-section after machining. A 0.3 mm anti-oxidation coating was applied to the upper, lower, and side surfaces of the slab. The mass percentages of Fe, C, N, and O impurities in the titanium slab were 0.25%, 0.10%, 0.005%, and 0.38%, respectively.
[0059] Step 2: TA4 strip is rolled using a hot-rolling mill. The billet is heated to 880℃. The slab is rolled by a roughing mill and a finishing mill to obtain a titanium alloy hot-rolled coil. The roughing thickness is 40mm and the deformation rate per pass is ≤35%. The finishing thickness is 4.5mm and the deformation rate per pass is ≤30%.
[0060] Step 3: Use a six-roll mill to roll the hot coil to 3.5mm, with a rolling deformation of 22.2% and a pass deformation of ≤15%. Use a continuous annealing, shot blasting and pickling line to anneal and remove oxide scale from the titanium coil. The heat treatment annealing temperature is 780℃.
[0061] Step 4: Trim both sides, with a single side trimming width of 8mm. After trimming, roll the titanium coil to 2.2mm using a 20-roll mill, with a rolling deformation of 37.1% and a pass deformation of ≤15%. Then, heat treat the titanium coil using a continuous annealing, shot blasting, and pickling line at a annealing temperature of 800℃.
[0062] Step 5: Trim both sides, with a single side trimming width of 5mm. After trimming, roll the titanium coil to 0.7mm using a 20-roll mill, with a rolling deformation of 68.1% and a pass deformation of ≤10%. Then, heat treat the titanium coil in a bell-type annealing furnace at a temperature of 660℃.
[0063] Step 6: Trim both sides, with a single side trimming width of 5mm. After trimming, use a 20-roll mill for finished product rolling, with a deformation per pass ≤7% and a tension of 37kg / mm. 2 The rolling speed is 50 m / min, the rolling deformation is 28.5%, and the target rolling thickness is 0.5 mm.
[0064] Step 7: Heat-treat the cold-rolled titanium strip coils using a protective atmosphere annealing furnace at a temperature of 650℃ and a holding time of 8 hours.
[0065] Step 8: Use a tension bending straightening machine to straighten the finished titanium coil with an elongation of 0.5%.
[0066] Comparative Example 1
[0067] The preparation process and production parameters of Comparative Example 1 and Example 1 are the same. The only difference is that in Comparative Example 1, the Fe content of the titanium blank is 0.7% and the O content is 0.5%.
[0068] Comparative Example 2
[0069] The preparation process and production parameters of Comparative Example 2 and Example 2 are the same. The only difference is that Comparative Example 2 uses the VAR melting and forging of round ingots into slabs with a small cutter head, resulting in a slab cross-sectional thickness difference of 5 mm. Furthermore, no edge trimming is performed before cold rolling, and the rolling variation of the finished product is 50%, from 1.0 mm to 0.5 mm.
[0070] Comparative Example 3
[0071] The preparation process and production parameters of Comparative Example 3 and Example 1 are the same, the only difference being that in step six, the tension is 100 kg / mm. 2 The rolling speed is 100 m / min.
[0072] Comparative Example 4
[0073] The preparation process and production parameters of Comparative Example 4 and Example 1 are the same, the only difference being that the heat treatment temperature in step seven is 550°C.
[0074] The finished titanium coils prepared in Examples 1-2 and Comparative Examples 1-4 were sampled and tested, and the results are shown in Table 1.
[0075] Table 1
[0076]
[0077] The chemical composition of Comparative Example 1 differs from that of this application, resulting in the finished TA4 titanium alloy strip failing to meet mechanical property requirements. Furthermore, the higher O and Fe content leads to higher strip strength, causing multiple strip breakages during rolling and resulting in coil scrap. Comparative Example 2, lacking edge trimming before cold rolling, experienced cracking at sharp corners and burrs, leading to two strip breakages. Additionally, the slab cross-sectional thickness difference reached 5mm, and after rolling and annealing of the three small coils, the unevenness was approximately 15mm / m, exhibiting significant rib and double-sided wavy patterns. Simultaneously, the finished product showed significant rolling deformation, resulting in rib formation defects and coil scrap. Comparative Example 3 had excessive tension and rolling speed, causing multiple instances of titanium strip deviation and tilting during rolling. The excessive tension and high rolling speed also resulted in severe rib formation. In Comparative Example 4, the heat treatment temperature of 550℃ resulted in the finished titanium strip failing to meet the mechanical properties required by this patent. In Examples 1 and 2 using the preparation process of this invention, no strip breakage or rib formation occurred during rolling. Moreover, the TA4 titanium alloy coil has a high yield, can be produced stably, has a straight shape, excellent comprehensive mechanical properties, and low cost.
[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A low cost TA4 titanium alloy strip production process characterized by, Includes the following steps: Step 1: Prepare TA4 flat ingots using electron beam cold hearth furnace casting method. The obtained flat ingots have a width ≥1000mm and a thickness of 170~220mm. Use a large integral milling machine to perform integral machining on the upper and lower surfaces of the ingots to obtain slabs. Step 2: TA4 strip is rolled using a hot rolling mill. The billet is heated to 800~950℃. The slab is rolled by a roughing mill and a finishing mill to obtain a titanium alloy hot-rolled coil. Step 3: Roll the hot coil to 3.0~3.8mm using a six-roll mill. Then, anneal and remove oxide scale from the titanium coil using a continuous annealing, shot blasting and pickling line. The heat treatment annealing temperature is 700~800℃. Step 4: Trim the edges on both sides. After trimming, roll the titanium coil to 1.8~2.5mm using a 20-roll mill. The deformation during rolling is 16~55%, and the deformation per pass is ≤15%. Heat treat the titanium coil using a continuous annealing, shot blasting and pickling line. The heat treatment annealing temperature is 700~800℃. Step 5: Trim both sides. After trimming, roll the titanium coil to 0.7~1.2mm using a 20-roll mill. The deformation during rolling is 33~70%, and the deformation per pass is ≤10%. Heat treat the titanium coil in a bell-type annealing furnace at a temperature of 600~680℃. Step six, two sides are cut, and after cutting, twenty-roller rolling machine is used for finished product rolling, rolling deformation 20~30%, rolling target thickness 0.4~0.5mm, pass deformation ≤7%, tension 25~75kg / mm 2 , rolling speed 30~60m / min; Step 7: Heat-treat the cold-rolled titanium strip coils using a protective atmosphere annealing furnace at a temperature of 600~680℃ and a holding time of 7~12h. Step 8: Use a tension bending straightening machine to straighten the finished titanium coil with an elongation of 0.5~1.0%.
2. The low cost TA4 titanium alloy strip manufacturing process according to claim 1, wherein, In step one, when using an electron beam cold hearth melting furnace (EB furnace), sponge titanium, titanium dioxide and titanium-iron alloy are selected to be pressed into briquettes as briquettes. The melting electron gun current is 5.0~15.0A and the melting rate is 300~1200kg / h.
3. The low cost TA4 titanium alloy strip manufacturing process according to claim 1, wherein, In step one, the diameter of the cutter head of the large integral cutter head milling machine is greater than the width of the slab, which is 1300~1500mm. The single-sided milling thickness is ≥3mm, and the thickness difference of the slab cross section after machining is ≤3mm.
4. The low cost TA4 titanium alloy strip manufacturing process according to claim 1, wherein, In step one, the mass percentage of impurity elements Fe in the composition of the slab is controlled to be ≤0.50%, C ≤0.20%, N ≤0.10%, and O ≤0.40%.
5. The low cost TA4 titanium alloy strip manufacturing process according to claim 1, wherein, In step one, an anti-oxidation coating is applied to the upper and lower surfaces and sides of the slab.
6. The low cost TA4 titanium alloy strip manufacturing process according to claim 5, wherein, The thickness of the anti-oxidation coating is 0.3~1.0 mm.
7. The low cost TA4 titanium alloy strip manufacturing process according to claim 1, wherein, In step two, the rough rolling thickness is 30~60mm and the deformation rate per pass is ≤35%, and the finish rolling thickness is 4~6mm and the deformation rate per pass is ≤30%.
8. The low cost TA4 titanium alloy strip manufacturing process of claim 1, wherein, In step three, the deformation during rolling is 20-50%, and the deformation rate per pass is ≤15%.
9. The low cost TA4 titanium alloy strip manufacturing process according to claim 1, wherein, In steps four, five, and six, when cutting the edges on both sides, the width of the cut edge on one side should be ≥5mm.