CN113737035A - Preparation method of titanium alloy plate - Google Patents

Preparation method of titanium alloy plate Download PDF

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Publication number
CN113737035A
CN113737035A CN202110917256.9A CN202110917256A CN113737035A CN 113737035 A CN113737035 A CN 113737035A CN 202110917256 A CN202110917256 A CN 202110917256A CN 113737035 A CN113737035 A CN 113737035A
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plate
rolling
thickness
titanium alloy
heating
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CN113737035B (en
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仇庆凡
王艳玲
薛倩芸
景建元
赵海云
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Beijing Jinyu Shunda Technology Co ltd
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Beijing Jinyu Shunda Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C22C1/03—Making non-ferrous alloys by melting using master alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/46—Roll speed or drive motor control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/58—Roll-force control; Roll-gap control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/16—Remelting metals
    • C22B9/20—Arc remelting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C14/00—Alloys based on titanium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
    • C22F1/18—High-melting or refractory metals or alloys based thereon
    • C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon

Abstract

The invention belongs to the technical field of alloy material processing, and relates to a preparation method of a titanium alloy plate. The preparation method comprises the following steps: (1) uniformly mixing all components of the titanium alloy material, pressing into an electrode block, welding the electrode block in vacuum, and smelting to obtain a homogeneous ingot; (2) heating the homogeneous cast ingot, shaping the homogeneous cast ingot on a press machine to obtain a square billet, and grinding the square billet after air cooling; (3) heating the polished square billet and then carrying out hot continuous rolling; (4) and (4) straightening, heat treating, acid and alkali washing, cutting and polishing the rolled plate obtained by hot continuous rolling to obtain the finished product titanium alloy plate. By utilizing the preparation method of the titanium alloy plate, the titanium alloy plate can be prepared with short process, low cost and high quality.

Description

Preparation method of titanium alloy plate
Technical Field
The invention belongs to the technical field of alloy material processing, and relates to a preparation method of a titanium alloy plate.
Background
The titanium alloy has low density, high strength and excellent corrosion resistance, and is widely applied to the fields of national defense and military industry, aerospace, petrochemical industry and marine ships. The plate is most widely applied to various processing materials such as pipes, rods, wires, plates and the like in the downstream market of titanium alloy, and accounts for about 50 percent of the total consumption of the titanium material. According to the analysis of relevant statistical data, the largest market application field of the titanium and titanium alloy plates and strips is the petrochemical field, which accounts for about 60% of the total consumption amount, and the aerospace field, which accounts for about 15% of the total consumption amount. In recent years, the yield of titanium plate strips in China generally tends to increase, and the increase rate is far higher than that of the whole titanium processing material.
The traditional titanium alloy plate preparation process is complex. The current domestic rolling process of the titanium alloy plate comprises the following steps: ingot casting, heating, forging and upsetting, returning and upsetting, air cooling and grinding, heating and upsetting, repairing, heating and forging, planing and milling, heating, rolling, heat treatment, acid-base washing, cutting and planing and milling, and obtaining a finished product. Because the cast structure of the titanium alloy is generally thicker, the uniformity of the material is poorer and the internal defects are more, the cast ingot needs to be subjected to continuous heating upsetting and pulling to destroy the original cast structure to obtain a uniform and fine processing structure, and then the uniform and fine processing structure is forged and expanded to a blank state required by rolling at a certain temperature to be rolled. However, the forging cost and the equipment investment are very large, which is also one reason for the very high processing cost and price of the titanium alloy. In the above conventional process, continuous forging is essential for the preparation of high-quality titanium alloy sheet material, which is also a key obstacle for further expanding the application range and usage amount of the titanium alloy sheet material.
In response to this, there is a need to develop a new titanium alloy plate manufacturing process. The ingot direct rolling process can effectively reduce the production cost, but the industrial production application is not realized at present. In addition, the parameters of the pretreatment shaping of the cast ingot and the subsequent rolling process are not clear.
Disclosure of Invention
The invention aims to provide a method for preparing a titanium alloy plate, which can prepare the titanium alloy plate with short process, low cost and high quality.
To achieve this object, in a basic embodiment, the present invention provides a method for manufacturing a titanium alloy sheet, the method comprising the steps of:
(1) uniformly mixing all components of the titanium alloy material, pressing into an electrode block, welding the electrode block in vacuum, and smelting to obtain a homogeneous ingot;
(2) heating the homogeneous cast ingot, shaping the homogeneous cast ingot on a press machine to obtain a square billet, and grinding the square billet after air cooling;
(3) heating the polished square billet and then carrying out hot continuous rolling;
(4) and (4) straightening, heat treating, acid and alkali washing, cutting and polishing the rolled plate obtained by hot continuous rolling to obtain the finished product titanium alloy plate.
The preparation method comprises the following steps: smelting, hot shaping, hot continuous rolling, straightening cutting, acid-base washing and polishing or grinding to obtain the finished plate. The invention develops and designs a new rolling process by utilizing the advancement of the rolling mill, and simplifies the production flow; through the strong lower pressure, the large opening and the large stroke of the rolling mill, the continuous heat treatment forging process in the traditional processing process is cancelled, and the process is similar to the ingot casting straight rolling process; the crystal grains are crushed only by the deformation generated in the rolling process, and the internal structure is homogenized. Through the optimal setting of rolling parameters, the performance of the titanium alloy plate prepared by the invention is not inferior to that of the titanium alloy plate prepared by the traditional process, and the production and processing cost is saved by 10-20%.
In a preferred embodiment, the present invention provides a method for producing a titanium alloy sheet, wherein in step (1),
the cast ingot is made of 0-grade sponge titanium and intermediate alloy according to nominal components and content;
the smelting is carried out in a vacuum consumable electrode arc furnace (VAR furnace), and the smelting times are 3-5 times.
In a preferred embodiment, the invention provides a method for preparing a titanium alloy plate, wherein in the step (1), the homogenized ingot obtained after smelting is further subjected to lathe turning peeling and sawing riser treatment.
In a preferred embodiment, the invention provides a preparation method of a titanium alloy plate, wherein in the step (2), the homogeneous ingot is heated in a heating furnace to 80-200 ℃ below the beta transformation point, the temperature is kept for 200min, then the temperature is increased to 150-200 ℃ above the beta transformation point, the temperature is kept for 300-600min, and the heated ingot is shaped on a press (because the ingot is generally cylindrical and has a larger diameter and is larger than the maximum opening degree of a rolling mill, and the contact area of the cylindrical ingot and a rolling rod during rolling is too small, the local stress is too large, the rolling rod is easily damaged, and the deformation is not uniform).
In a preferred embodiment, the invention provides a preparation method of a titanium alloy sheet, wherein in the step (2), the shaping is mainly flat, and the thickness of the cast ingot after flat beating is 200-350 mm.
In a preferred embodiment, the invention provides a method for preparing a titanium alloy plate, wherein in the step (2), the grinding comprises the steps of grinding scale and chippings on the surface of the square billet by using a grinding and polishing machine, planing and milling six surfaces on a planomiller, flattening the surface, and milling the parts with raised and uneven peripheral surfaces.
In a preferred embodiment, the present invention provides a method for preparing a titanium alloy sheet, wherein in the step (3), the heating comprises the following specific steps: and (3) placing the polished square billet into a box-type resistance furnace, heating to the temperature below the beta transformation point of 150-.
In a preferred embodiment, the invention provides a method for preparing titanium alloy plates, wherein in the step (3), different rolling processes are selected according to the thickness of rolled pieces in the hot continuous rolling process,
when the thickness of the initial square billet and the plate blank is more than the thickness of the finished plate plus 100mm, rolling in a mode of fixed numerical reduction, and replacing the forging process by the fixed reduction (so that on one hand, the internal crystal grains can be ensured to be fully crushed and refined, and the comprehensive performance of the plate can be improved, and on the other hand, the phenomena of cracking and deformation of the blank in large deformation can be prevented by reasonably and continuously reducing);
when the thickness of the plate blank is reduced to be less than +100mm of the thickness of the finished plate, rolling is carried out by adopting a mode of controlling the reduction amount by deformation according to the thickness required by the finished plate (after the thickness of the plate blank is reduced, the rolling mode of controlling the deformation can effectively improve the rolling efficiency, further refine and homogenize the internal structure, and improve the mechanical property of the finished plate).
In a preferred embodiment, the present invention provides a method for manufacturing a titanium alloy sheet, wherein in step (3), hot continuous rolling is performed on a three-roll system four/six-roll cold and hot rolling mill train,
when the thickness of the initial square billet and the plate blank is more than the thickness of the finished plate plus 100mm, the fixed value of the single-pass reduction is 20-70mm, and the rolling speed is 0.2-0.8 m/s;
when the thickness of the plate blank is reduced to be less than the thickness of the finished plate blank plus 100mm, the single-pass deformation amount is 40-80% of the thickness of the current plate blank, the rolling speed is 0.2-0.8m/s, and the plate blank is rolled to the thickness of the required finished plate.
In a preferred embodiment, the present invention provides a method for producing a titanium alloy sheet, wherein in step (4),
after the hot continuous rolling is finished, straightening by using rolling high-temperature waste heat by using a straightening machine;
placing the straightened plate into a heating furnace for heat treatment, wherein the heat treatment temperature is 750-;
putting the heat-treated plate into an acid-base washing tank for acid-base washing to remove a surface oxidation layer and an oxygen-enriched layer, and then carrying out spray water bath to wash away residual acid-base liquid on the surface;
and cutting the plate subjected to water bath by using a water cutting or plate shearing machine, pre-cutting the plate into long and wide sizes, polishing the surface by using a handheld polishing machine, and removing residual stains, oxides and small uneven areas to obtain the finished product titanium alloy plate.
The preparation method of the titanium alloy plate has the beneficial effects that the titanium alloy plate can be prepared in a short process, low cost and high quality.
The titanium alloy plate prepared by the preparation method can fully destroy the as-cast structure in the cast ingot without multi-pass heating, forging and upsetting, and equiaxial grains with small grain size, good structure uniformity and excellent performance are obtained after recovery and recrystallization; the steps required in the preparation process of the titanium alloy plate can be reduced, the cost is obviously reduced by 10-20%, the prepared titanium alloy plate has uniform component structure, and the performance meets the requirements of GB3621-94/GJB 2505A-2008.
The traditional titanium alloy plate preparation method is complex and complicated in production process, so that the processing cost of the titanium alloy plate is greatly improved, the processing timeliness is low, the production period is prolonged, the controllability is reduced, the batch stability of products is poor, and finally huge waste of resources and energy is caused. The invention adopts a three-roller system four/six-roller reversible cold and hot rolling integrated machine (refer to Nacheqian Yun, Liujian Zun, Jingjian Yuan and the like, and a cold and hot rolling integrated machine CN213495644U), is an international advanced rolling device, approximately realizes the ingot casting direct rolling process by utilizing the advantages of long rolling distance and large tonnage of a rolling mill, does not need to undergo the process of forging and upsetting, and directly obtains the titanium alloy plate with fine and uniform microstructure by large reduction and deformation brought by rolling of the rolling mill. In the rolling process, the tissue extends along the rolling direction, but simultaneously, as the interface energy is increased, the phase interface activity is strengthened, the elongated alpha phase can be equiaxial to reduce the interface energy, so that the tissue is in a low free energy state. The invention adopts the optimized rolling temperature, the two-phase rolling, the recovery and the recrystallization are sufficient, and then the plate adopts a slower cooling rate, the thermal stress is reduced, and the residual stress of the obtained plate is very small. The invention controls the rolling parameters such as rolling speed, rolling reduction and the like in an optimal range, can effectively avoid the rolling defects such as cracking, deformation and the like, and obtains the high-quality titanium alloy plate.
Drawings
FIG. 1 is a microstructure morphology diagram of a TC4 finished titanium alloy plate prepared in example 1.
FIG. 2 is a microstructure morphology diagram of a TC611 finished titanium alloy plate prepared in example 2.
Detailed Description
The following further describes embodiments of the present invention by way of examples and figures.
Example 1: preparation of titanium alloy plate
(1) 0-grade sponge titanium and high-quality intermediate alloy aluminum and vanadium are adopted to carry out alloy proportioning according to TC4(Ti-6Al-4V), the proportioned alloy is pressed into an alloy block on a 3000-ton oil press, and the alloy block is welded into an electrode in a vacuum welding box. And (3) carrying out tertiary smelting by using a consumable vacuum arc furnace (VAR furnace), and turning and peeling the obtained cast ingot by a lathe and sawing a riser to obtain the finished alloy cast ingot.
(2) Heating the cast ingot to 850 ℃ in a box type resistance heating furnace, and preserving heat for 100 min; then raising the temperature to 1150 ℃, and preserving the temperature for 500 min. The heated cast ingot is shaped on a 4500T press, and the cylindrical cast ingot is pressed into a rectangular blank with the thickness of 300 mm. After air cooling, the oxide skin and the chippings on the surface of the blank are ground by a grinding and polishing machine, the surface is planed and milled on a six-surface milling machine, the surface is leveled, and the raised and uneven parts on the peripheral surface are milled.
(3) And (3) putting the shaped and polished blank into a box type resistance furnace, heating to 850 ℃, preserving heat for 250min, raising the heating temperature to 950 ℃, and preserving heat for 350 min. Rolling the plate into a finished product with the thickness of 20mm by a 1450mm three-roller four/six-roller cold and hot rolling unit, wherein when the plate thickness is more than 120mm, the single-pass reduction is 50mm, and the rolling speed is 0.5 m/s; when the thickness of the plate blank is reduced to be below 120mm, the single-pass reduction deformation is 60%, the rolling speed is 0.4m/s, and the plate blank is rolled until the thickness of the finished plate is 20 mm.
(4) Straightening by using a straightening machine by using rolling high-temperature waste heat after rolling is finished; placing the straightened plate into a heating furnace for heat treatment, wherein the heat treatment temperature is 750 ℃, preserving the heat for 180min, and then air-cooling to room temperature; putting the heat-treated plate into an acid-base washing tank for acid-base washing to remove a surface oxidation layer and an oxygen-enriched layer, and then carrying out spray water bath to wash away residual acid-base liquid on the surface; and cutting the water-bath plate by using a water cutting or plate shearing machine, pre-cutting the plate into long and wide sizes, polishing by using a handheld polishing machine, and removing residual stains, oxides and small uneven areas to obtain the finished plate.
Example 2: preparation of titanium alloy plate
(1) 0-grade sponge titanium and high-quality intermediate alloy aluminum, iron, chromium, tin and silicon are adopted, alloy proportioning is carried out according to TC611(Ti- (4-7) Al- (0.2-2.5) Fe- (0.1-2) Cr- (0.1-2) Sn- (0.1-0.5) Si), the proportioned alloy is pressed into an alloy block on a 3000-ton oil press, and the alloy block is welded into an electrode in a vacuum welding box. And (3) carrying out tertiary smelting by using a consumable vacuum arc furnace (VAR furnace), and turning and peeling the obtained cast ingot by a lathe and sawing a riser to obtain the finished alloy cast ingot.
(2) Heating the cast ingot to 800 ℃ in a box-type resistance heating furnace, and preserving heat for 100 min; then raising the temperature to 1000 ℃, and preserving the temperature for 500 min. Shaping the heated cast ingot on a 4500T press, and pressing the round cast ingot into a rectangular blank with the thickness of 200 mm. After air cooling, the oxide skin and the chippings on the surface of the blank are ground by a grinding and polishing machine, the surface is planed and milled on a six-surface milling machine, the surface is leveled, and the raised and uneven parts on the peripheral surface are milled.
(3) And (3) putting the shaped and polished blank into a box-type resistance furnace, heating to 750 ℃, preserving heat for 250min, raising the heating temperature to 900 ℃, and preserving heat for 350 min. Rolling the plate into a finished product with the thickness of 10mm by a 1450mm three-roller four/six-roller cold and hot rolling unit, wherein when the plate thickness is more than 110mm, the single-pass reduction is 50mm, and the rolling speed is 0.4 m/s; when the thickness of the plate blank is reduced to be less than 110mm, the single-pass reduction deformation is 60%, the rolling speed is 0.3m/s, and the plate blank is rolled until the thickness of the finished plate is 10 mm.
(4) Straightening by using a straightening machine by using rolling high-temperature waste heat after rolling is finished; placing the straightened plate into a heating furnace for heat treatment, wherein the heat treatment temperature is 800 ℃, keeping the temperature for 180min, and then air-cooling to room temperature; putting the heat-treated plate into an acid-base washing tank for acid-base washing to remove a surface oxidation layer and an oxygen-enriched layer, and then carrying out spray water bath to wash away residual acid-base liquid on the surface; and cutting the water-bath plate by using a water cutting or plate shearing machine, pre-cutting the plate into long and wide sizes, polishing by using a handheld polishing machine, and removing residual stains, oxides and small uneven areas to obtain the finished plate.
Example 3: examination of titanium alloy sheets obtained in examples 1 and 2
The microstructure morphology diagrams of the titanium alloy plates prepared in the examples 1 and 2 are shown in the figures 1 and 2 respectively. As can be seen from FIGS. 1 and 2, the phases inside the finished plate are uniformly distributed, and an ideal, fine and equiaxial structure is obtained; after annealing, the plate realizes complete recrystallization, the crystal grains are uniformly distributed, and the supply requirement of the titanium alloy plate is met.
Table 1 shows the comparison results of the performance tests of TC4 prepared in example 1 and the TC611 titanium alloy plate prepared in example 2 (the test method is a method required by GB3621-94/GJB 5A-2008) according to the conventional process (ingot melting-heating-forging-returning-annealing-air cooling-coping-heating upsetting-repairing-heating forging-planning-heating-rolling-annealing-rolling-heating upsetting-repairing-heating-forging-milling-rolling-acid-alkali-washing-cutting-planning-rolling-finished product), wherein the ingot melting, acid-alkali washing and the subsequent processes are consistent with the present invention, except that the conventional process adopts a multi-pass heating upsetting process before rolling to refine the internal structure and improve the performance of the TC4 and the TC611 titanium alloy plates prepared in example 2 (the test method is GB3621-94/GJB 5-25052-rolling . The results in Table 1 show that the performance of the titanium alloy plate prepared by the method is close to or slightly higher than that of the titanium alloy plate prepared by the traditional method, and the requirements of GB3621-94/GJB2505A-2008 are met.
TABLE 1
Figure BDA0003206078770000071
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations. The foregoing examples or embodiments are merely illustrative of the present invention, which may be embodied in other specific forms or in other specific forms without departing from the spirit or essential characteristics thereof. The described embodiments are, therefore, to be considered in all respects as illustrative and not restrictive. The scope of the invention should be indicated by the appended claims, and any changes that are equivalent to the intent and scope of the claims should be construed to be included therein.

Claims (10)

1. The preparation method of the titanium alloy plate is characterized by comprising the following steps:
(1) uniformly mixing all components of the titanium alloy material, pressing into an electrode block, welding the electrode block in vacuum, and smelting to obtain a homogeneous ingot;
(2) heating the homogeneous cast ingot, shaping the homogeneous cast ingot on a press machine to obtain a square billet, and grinding the square billet after air cooling;
(3) heating the polished square billet and then carrying out hot continuous rolling;
(4) and (4) straightening, heat treating, acid and alkali washing, cutting and polishing the rolled plate obtained by hot continuous rolling to obtain the finished product titanium alloy plate.
2. The method of claim 1, wherein: in the step (1), the step (c),
the cast ingot is made of 0-grade sponge titanium and intermediate alloy according to nominal components and content;
the smelting is carried out in a vacuum consumable electrode arc furnace, and the smelting times are 3-5 times.
3. The method of claim 1, wherein: in the step (1), the homogenized ingot obtained after smelting is further subjected to lathe turning peeling and dead head sawing treatment.
4. The method of claim 1, wherein: in the step (2), the homogeneous ingot is heated in a heating furnace to 80-200 ℃ below the beta transformation point, the temperature is kept for 200min, then the temperature is increased to 150 ℃ above the beta transformation point and 200 ℃ and the temperature is kept for 600min, and the heated ingot is shaped on a press.
5. The method of claim 1, wherein: in the step (2), the shaping is mainly carried out by flattening, and the thickness of the cast ingot after flattening is 200-350 mm.
6. The method of claim 1, wherein: in the step (2), the polishing is to polish the oxide skin and the scraps on the surface of the square billet by using a polishing machine, plane and mill six surfaces on a planer type milling machine, level the surface and mill the parts with uneven raised peripheral surfaces.
7. The preparation method according to claim 1, wherein in the step (3), the heating comprises the following specific steps: and (3) placing the polished square billet into a box-type resistance furnace, heating to the temperature below the beta transformation point of 150-.
8. The method of claim 1, wherein: in the step (3), different rolling processes are selected according to the thickness of the rolled piece in the hot continuous rolling process,
when the thickness of the initial square billet and the plate blank is more than the thickness of the finished plate plus 100mm, rolling in a mode of fixed numerical reduction, and replacing the forging process by the fixed reduction;
when the thickness of the slab is reduced to be less than +100mm of the thickness of the finished plate, rolling is carried out by controlling the rolling reduction according to the required thickness of the finished plate by deformation.
9. The method of claim 8, wherein: in the step (3), hot continuous rolling is carried out on a three-roller system four/six-roller cold and hot rolling unit,
when the thickness of the initial square billet and the plate blank is more than the thickness of the finished plate plus 100mm, the fixed value of the single-pass reduction is 20-70mm, and the rolling speed is 0.2-0.8 m/s;
when the thickness of the plate blank is reduced to be less than the thickness of the finished plate blank plus 100mm, the single-pass deformation amount is 40-80% of the thickness of the current plate blank, the rolling speed is 0.2-0.8m/s, and the plate blank is rolled to the thickness of the required finished plate.
10. The method of claim 1, wherein: in the step (4), the step (c),
after the hot continuous rolling is finished, straightening by using rolling high-temperature waste heat by using a straightening machine;
placing the straightened plate into a heating furnace for heat treatment, wherein the heat treatment temperature is 750-;
putting the heat-treated plate into an acid-base washing tank for acid-base washing to remove a surface oxidation layer and an oxygen-enriched layer, and then carrying out spray water bath to wash away residual acid-base liquid on the surface;
and cutting the plate subjected to water bath by using a water cutting or plate shearing machine, pre-cutting the plate into long and wide sizes, polishing the surface by using a handheld polishing machine, and removing residual stains, oxides and small uneven areas to obtain the finished product titanium alloy plate.
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