A method for improving the yield of hot-rolled titanium and titanium alloy plates

Abstract

This application discloses a method for improving the yield of hot-rolled titanium and titanium alloy plates, relating to the field of hot rolling processing of titanium and titanium alloy plates, including the following steps: Step 1, material head screening; Step 2, surface treatment of the material heads obtained in Step 1 by peeling, polishing or sandblasting and pickling; Step 3, material head welding; Step 4, material head rolling; Step 5, heat treatment of the finished plate; Step 6, surface treatment and slitting of the finished plate after heat treatment in Step 5 to obtain qualified finished titanium and titanium alloy plates. This invention solves the problem of easy breakage of traditional welds during hot rolling in the prior art, enhances the stability of the hot rolling process, reduces welding difficulty, simplifies the production process, improves the yield stability, and increases the product yield and production efficiency.

Description

Technical Field

[0001] This invention relates to the field of hot rolling of titanium and titanium alloy plates, and more particularly to a method for improving the yield of hot-rolled titanium and titanium alloy plates. Background Technology

[0002] Titanium and titanium alloys possess excellent properties such as high strength, light weight, high temperature resistance, corrosion resistance, and non-magnetic properties, making them widely used in aerospace, shipbuilding, weaponry, and chemical industries. Hot rolling is the primary production method for titanium and titanium alloy sheets, but the process involves peeling, polishing, and edge trimming, generating a large number of heavy but small-sized scraps, resulting in significant raw material waste. Typically, the yield from slab to finished sheet is only 55%-65%.

[0003] Chinese Patent Publication No. CN108620435B discloses a method for improving the yield of hot-rolled steel sheets using hot-rolled titanium and titanium alloy scrap. This method involves screening and surface-treating the scrap obtained from the trimming of the slab during the single-sided hot rolling process to produce titanium and titanium alloy sheets. The scrap is then welded to a welded plate to enlarge its size. This allows for the re-rolling of scrap that does not meet the mill's rolling requirements. Scraps with the required width are rolled in a single pass, while those with the required width undergo two passes with reverse rolling. Subsequent processes, including annealing, surface treatment, and slitting, result in finished steel sheets with excellent shape and performance, meeting relevant standards. This method increases the yield of finished steel sheets from the same slab by 5%-10%. The operation is simple and practical, effectively improving the yield of hot-rolled titanium and titanium alloy sheets.

[0004] While the above methods can improve the yield of titanium and titanium alloys to a certain extent, the process of enlarging the size of the scrap by manually welding the scrap to the welded plate with argon arc welding makes the weld joint prone to breakage during hot rolling, which is not conducive to production. Summary of the Invention

[0005] This application provides a method to improve the yield of hot-rolled titanium and titanium alloy plates, which solves the problem of easy breakage during hot rolling caused by traditional welds in the prior art. It enhances the stability of the hot rolling process, reduces welding difficulty, simplifies the production process, and improves the yield stability, thereby increasing the product yield and production efficiency.

[0006] This application provides a method for improving the yield of hot-rolled titanium and titanium alloy plates, including the following steps:

[0007] Step 1: Material screening:

[0008] The specifications of the raw materials are calculated and selected based on the dimensions of the finished sheet material. The raw materials must meet the following requirements:

[0009] ;

[0010] ; ; ;

[0011] ; ;

[0012] H is the thickness of the feedstock; W is the width of the feedstock; L is the length of the feedstock; k is the effective coefficient, with a value of 0.68-0.95;

[0013] h represents the thickness of the finished sheet material; w represents the width of the finished sheet material; l represents the length of the finished sheet material.

[0014] The minimum thickness of the finished sheet material before the final rolling process; This refers to the deformation rate of the finished product.

[0015] Design the minimum rolling width for the rolling mill; Design the minimum rolling length for the rolling mill;

[0016] Step 2: Perform surface treatment on the material heads obtained in Step 1, such as peeling and polishing or sandblasting and acid washing.

[0017] Step 3: Welding of the sprue parts:

[0018] (1) Select a titanium plate with a plasticity not greater than that of the material head as the welding plate. The welding plate includes a first welding plate and a second welding plate. The first welding plate includes a first lap plate and a first welding part. The first lap plate is on the upper side of the right end of the material head and contacts the material head. The first welding part contacts the right side of the material head. The second welding plate includes a second lap plate and a second welding part. The second lap plate is on the lower side of the right end of the material head and contacts the material head. The second welding part contacts the right side of the material head. The dimensions of the welding plate meet the following requirements:

[0019] , , The thickness of the first welded section, The thickness of the second welded section;

[0020] The thickness of the overlap plate;

[0021] , Width of the welded section;

[0022] , This refers to the length of the welded plate;

[0023] (2) The material head obtained in step two is spot welded to the first lap plate and the material head to form a whole. The material head and the second lap plate are spot welded to form a whole. The two ends of the lap plate along the width direction do not extend beyond the two ends of the material head along the width direction.

[0024] Step 4: Rolling the material head:

[0025] definition w represents the width of the finished sheet material. The allowance for trimming the finished board width is calculated by taking the original width W of the material head and... To make a comparison, when The weld head obtained in step three is rolled along its length to the size of the finished sheet, and then the weld plate is removed. The welded head obtained in step three is subjected to two-stage reversing rolling. The first rolling stage uses the length direction of the head as the rolling direction, extending the original length L of the head to... Then, the welded plates are removed, and the spot welded areas of the material head are sandblasted, pickled, or polished to remove surface defects. The material head is then rolled a second time to the extended length. The width direction of the finished sheet is taken as the length direction of the finished sheet, with the original width W of the material head as the length direction of the finished sheet. The material head is rolled along the original width W of the material head to the size of the finished sheet.

[0026] Step 5: Heat treatment of finished sheet metal:

[0027] Atmospheric annealing in a roller furnace is adopted to control the annealing temperature. , For titanium and titanium alloys Temperature change, The value ranges from 20-250°C, and the holding time is... h is the thickness of the finished board, and C is the insulation time coefficient, with C taking a value of After the insulation is completed, the finished boards are taken out of the oven and air-cooled.

[0028] Step 6: Perform surface treatment and slitting on the finished sheet material after heat treatment in Step 5 to obtain qualified finished titanium and titanium alloy sheets.

[0029] Furthermore, in step three, the thickness of the overlap plate is 2-5mm, and the length of the overlap plate in contact with the material head is 5-10mm.

[0030] Furthermore, in step three, the first and second welded plates are symmetrical along the horizontal center line of the material head.

[0031] Furthermore, in step three, the welded plate includes a lap plate and a welded section, and the welded section includes an extension and a weld head.

[0032] Furthermore, the material of the overlapping plate and the extension is the same as that of the material head.

[0033] Furthermore, the welding head is formed into a multi-layer welding head by means of folding or layer cutting.

[0034] Furthermore, the raw material for the multi-layer welding head comes from the welding plate or the cut plate that is removed after the finished plate is pressed out.

[0035] Furthermore, the thickness of the multi-layer welding head is half the thickness of the material head, and the number of layers in the multi-layer welding head is 2-6 layers. The multi-layer welding head includes a first welding head and a second welding head.

[0036] Furthermore, the third step of the material head splicing process also includes a second material head, a third lap plate, and a fourth lap plate. The second material head is located on the right side of the multi-layer splicing head and is in contact with the right side of the multi-layer splicing head. The third lap plate is located on the upper left side of the second material head and on the right side of the first extension. The third lap plate is in contact with the second material head. The fourth lap plate is located on the lower left side of the second material head and on the right side of the second extension. The fourth lap plate is in contact with the second material head.

[0037] Furthermore, the second material head is welded together with the third and fourth overlapping plates by spot welding.

[0038] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0039] By spot welding the lap plate to one end of the material head, a stable support structure can be formed, avoiding the problem of easy breakage during hot rolling caused by traditional welds in the comparison document. It can provide better stability during hot rolling and reduce the risk of breakage due to insufficient strength of the welded part.

[0040] By spot welding the lap plate to one end of the material head, compared with the traditional continuous weld in the prior art, spot welding generates less welding stress, thereby reducing welding stress and preventing cracking or deformation caused by stress concentration during hot rolling, thus improving the product yield.

[0041] Spot welding reduces welding difficulty by requiring welding only at specific overlap positions. It allows for precise control, is easy to operate, has a short welding time, and minimal heat impact. Compared to traditional welds that render the weld unusable, spot welding has less impact on the material's properties, further improving the dimensional accuracy and shape stability of the welded material, enhancing the controllability of welding quality, thereby improving overall welding quality, increasing production efficiency, and reducing material waste.

[0042] By spot welding the overlap plate to one end of the material head, the welded plate is easier to remove than the traditional welding method in the comparison document, simplifying the production process and improving production efficiency.

[0043] By spot welding, the material head and the welding plate are welded together, which has good adaptability to plates of different thicknesses and sizes, and makes production more flexible. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the feedstock and welding plate of the present invention;

[0045] Figure 2 This is a schematic diagram of the material head and welding plate in Embodiment 2 of the present invention;

[0046] Figure 3 This is a schematic diagram of the stacked cutting welding head according to Embodiment 3 of the present invention;

[0047] Figure 4 This is a schematic diagram of the folded welding head according to Embodiment 3 of the present invention;

[0048] Figure 5 This is a schematic diagram of the feedstock and welding plate in Embodiment 4 of the present invention. Detailed Implementation

[0049] To facilitate understanding of the present invention, a more complete description of this application will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the invention. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to enable a more thorough and complete understanding of the disclosure of the present invention.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0051] Example 1

[0052] like Figure 1 As shown, this application discloses a method for improving the yield of hot-rolled titanium and titanium alloy plates, which specifically includes the following steps:

[0053] Step 1: Material screening:

[0054] The specifications of the raw materials are calculated and selected based on the dimensions of the finished sheet material. The raw materials must meet the following requirements:

[0055] ;

[0056] ; ; ;

[0057] ; ;

[0058] H is the thickness of the feedstock; W is the width of the feedstock; L is the length of the feedstock; k is the effective coefficient, with a value of 0.68-0.95;

[0059] h represents the thickness of the finished sheet material; w represents the width of the finished sheet material; l represents the length of the finished sheet material.

[0060] The minimum thickness of the finished sheet material before the final rolling process; This refers to the deformation rate of the finished product.

[0061] Design the minimum rolling width for the rolling mill; Design the minimum rolling length for the rolling mill;

[0062] Specifically, the cutting head is made of TA5 titanium alloy and cut with a single flame. The specifications and dimensions are as follows: The blank head width is 800mm and the blank head length is 587mm. The blank head width is greater than the minimum rolling width designed by the rolling mill, and the blank head length is about 150mm less than the minimum rolling length designed by the rolling mill. The pre-set size of the rolled finished plate is calculated based on the weight. ;

[0063] Step 2: Perform surface treatment on the material heads obtained in Step 1, such as peeling and polishing or sandblasting and acid washing.

[0064] Step 3: Welding of the sprue parts:

[0065] (1) Select a titanium plate with a plasticity not greater than that of the material head as the welding plate. The welding plate includes a first welding plate and a second welding plate. The first welding plate includes a first lap plate and a first welding part. The first lap plate is on the upper side of the right end of the material head, and the first welding part is in contact with the right side of the material head. The second welding plate includes a second lap plate and a second welding part. The second lap plate is on the lower side of the right end of the material head, and the second welding part is in contact with the right side of the material head. The dimensions of the welding plate meet the following requirements:

[0066] , , The thickness of the first welded section, The thickness of the second welded section;

[0067] , , , The thickness of the welded section;

[0068] The thickness of the overlap plate is 2-5mm, and the length of the overlap plate in contact with the material head is 5-10mm.

[0069] , Width of the welded section;

[0070] , This refers to the length of the welded plate;

[0071] Specifically, the welding plate is a TA2 welding plate, and the dimensions of the welding section are as follows: The dimensions of the overlap are ;

[0072] (2) The material head obtained in step two is spot welded to the first lap plate and the material head to form a whole. The material head and the second lap plate are spot welded to form a whole. The two ends of the lap plate along the width direction do not extend beyond the two ends of the material head along the width direction.

[0073] Step 4: Rolling the material head:

[0074] definition w represents the width of the finished sheet material. The allowance for trimming the finished board width is calculated by taking the original width W of the material head and... To make a comparison, when The weld head obtained in step three is rolled along its length to the size of the finished sheet, and then the weld plate is removed. The welded head obtained in step three is subjected to two-stage reversing rolling. The first rolling stage uses the length direction of the head as the rolling direction, extending the original length L of the head to... Then, the welded plates are removed, and the spot welded areas of the material head are sandblasted, pickled, or polished to remove surface defects. The material head is then rolled a second time to the extended length. The width direction of the finished sheet is taken as the length direction of the finished sheet, with the original width W of the material head as the length direction of the finished sheet. The material head is rolled along the original width W of the material head to the size of the finished sheet.

[0075] Step 5: Heat treatment of finished sheet metal:

[0076] Atmospheric annealing in a roller furnace is adopted to control the annealing temperature. , For titanium and titanium alloys Temperature change, The value ranges from 20-250°C, and the holding time is... h is the thickness of the finished board, and C is the insulation time coefficient, with C taking a value of After the insulation is completed, the finished boards are taken out of the oven and air-cooled.

[0077] Step 6: Perform surface treatment and slitting on the finished sheet material after heat treatment in Step 5 to obtain qualified finished titanium and titanium alloy sheets.

[0078] The comparative sample was prepared using the method disclosed in CN108620435B. Specifically, the feedstock was TA5 titanium alloy cut in one heat, and its dimensions were as follows: The blank head width is 800mm and the blank head length is 605mm. The blank head width is greater than the minimum rolling width designed by the rolling mill, and the blank head length is about 150mm less than the minimum rolling length designed by the rolling mill. The pre-set size of the rolled finished plate is calculated based on the weight. ;

[0079] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages:

[0080] By spot welding the lap plate to one end of the material head, a stable support structure can be formed, avoiding the problem of easy breakage during hot rolling caused by traditional welds in the comparison document. It can provide better stability during hot rolling and reduce the risk of breakage due to insufficient strength of the welded part.

[0081] By spot welding the lap plate to one end of the material head, compared with the traditional continuous weld in the prior art, spot welding generates less welding stress, thereby reducing welding stress and preventing cracking or deformation caused by stress concentration during hot rolling, thus improving the product yield.

[0082] Spot welding reduces welding difficulty, requiring welding only at specific overlap positions. It allows for precise control, is easy to operate, has a short welding time, and minimal heat impact. Compared to traditional welds that render the weld unusable, spot welding has less impact on the material's properties, further improving the dimensional accuracy and shape stability of the welded material, enhancing the controllability of welding quality, thereby improving overall welding quality, increasing production efficiency, and reducing material waste. Compared to the comparative example, material usage is reduced by 3%.

[0083] By spot welding the overlap plate to one end of the material head, the welded plate is easier to remove than the traditional welding method in the comparison document, simplifying the production process and improving production efficiency.

[0084] By spot welding, the material head and the welding plate are welded together, which has good adaptability to plates of different thicknesses and sizes, and makes production more flexible.

[0085] Example 2

[0086] The above embodiment 1 connects the material head and the welded plate together by spot welding to form a stable support structure, which has stronger stability in the hot rolling process and is further optimized to further improve the yield of hot rolled titanium and titanium alloy plates.

[0087] like Figure 2 As shown, the welding plate in step three includes a lap plate and a welding section, and the welding section includes an extension and a welding head;

[0088] The extension and the overlapping plate are made of the same material as the raw material.

[0089] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages:

[0090] By using the same material for the lap plate and extension as for the sprue, the part where the hot-rolled sprue meets the lap plate can still maintain similar material properties to the original sprue after removal, thus avoiding additional processing steps and costs caused by material differences.

[0091] By using the same material as the lap plate and extension as the headstock, the coefficient of thermal expansion, mechanical properties and chemical properties of the welded plate and the headstock are matched during hot rolling, thereby reducing stress concentration, cracking or interface separation caused by material differences.

[0092] By using the same material as the material head for the lap plate and extension, better bonding strength can be obtained during welding, improving stability and safety during the hot rolling process;

[0093] By using the same material for the overlap plate and extension as for the stock head, material consistency can reduce defects and inconsistencies in the hot rolling process, thereby improving the quality and reliability of the final product.

[0094] By using the same material as the lap plate and extension as the headstock, these parts can still be used as qualified materials after hot rolling and removal, thereby improving the overall material utilization rate and reducing waste.

[0095] Example 3

[0096] The above-described embodiment 2 further improves the quality and stability of hot-rolled titanium and titanium alloy plates by using the same material as the material head for the overlapping plate and the extension, and further optimizes the yield of hot-rolled titanium and titanium alloy plates.

[0097] like Figure 3-4As shown, the welded plate or cut plate removed after pressing out the finished plate in Embodiment 1 or Embodiment 2 above is formed into a multi-layer welded head by rolling or stacking and cutting. The thickness of the multi-layer welded head is 1 / 2 of the thickness of the material head. The multi-layer welded head includes a first welded head and a second welded head.

[0098] The multi-layer welding head has 2-6 layers. A hole is drilled at the center of the upper surface of the top layer of the multi-layer welding head. The hole passes through the entire welding head along the thickness direction and has a diameter of 5-20mm. Lubricating oil is injected along the hole after pressing.

[0099] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages:

[0100] By reusing previously discarded welded plates or cut plates to form multi-layer welded joints, the utilization rate of materials can be significantly improved. In the production process of titanium and titanium alloy hot-rolled plates, material waste is reduced, thereby reducing production costs. By recycling and reusing previously discarded materials, raw materials are saved and the generation of industrial waste is reduced.

[0101] Multi-layer welding heads are formed by stacking or folding. The number of layers and structure of the welding head can be adjusted as needed, which enhances the flexibility and adjustability of production and enables it to quickly adapt to different production needs.

[0102] Multi-layer welded heads formed by stacking or folding have gaps in the middle, which reduces the plasticity requirements of the welded part and thus expands the range of materials that can be selected for the welded head.

[0103] The welded heads formed by stacking and cutting can come from different types or specifications of titanium and titanium alloy plates, thus expanding the range of materials available. The stacking and cutting technology can precisely control the thickness and shape of each layer, thereby improving the quality of the welded heads and the quality of the finished plates. Compared with stacking and cutting, the welded heads formed by rolling and folding are more flexible, have a simpler process, and can improve production efficiency.

[0104] By injecting lubricating oil into the holes of the multi-layer welded head, friction between layers can be reduced after hot rolling, making the multi-layer welded head easier to separate and facilitating rapid and efficient disassembly of the welded head in subsequent processes, thereby improving production efficiency. Due to the presence of lubricating oil, the damage to the multi-layer welded head during disassembly is reduced, making the welded head easier to clean and repair, promoting its reuse, reducing production costs, and improving the utilization rate of welded materials. Compared with the prior art, the present invention significantly reduces the dimensional requirements of the welded plate.

[0105] Example 4

[0106] The above-described embodiment 3 improves the utilization rate of waste materials in the production process of titanium and titanium alloy hot-rolled plates by forming multi-layer welded heads from discarded welded plates or cut plates, and further optimizes the process to improve the yield of titanium and titanium alloy hot-rolled plates.

[0107] like Figure 5 As shown, step three, the welding of the material heads, also includes a second material head, a third lap plate, and a fourth lap plate. The second material head is on the right side of the multi-layer welding head and contacts the right side of the multi-layer welding head. The third lap plate is on the upper left side of the second material head, on the right side of the first extension, and contacts the second material head. The fourth lap plate is on the lower left side of the second material head, on the right side of the second extension, and contacts the second material head.

[0108] The second material head is welded together with the third and fourth overlapping plates by spot welding.

[0109] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages:

[0110] By welding the welded plate together with multiple material heads, the utilization rate of the welded material is further improved, material waste in the production process is reduced, and the generation of waste and scrap is reduced, thereby improving the overall material utilization rate.

[0111] By welding multiple material heads together, the number of loading and unloading operations during hot rolling is reduced, the operation steps are simplified, production costs are reduced, and production efficiency is improved.

[0112] By welding the welded plate together with multiple material heads, the thickness specifications of the finished sheet can be made the same after one round of hot rolling, thus improving the consistency of product quality.

[0113] By welding the welded plate together with multiple material heads, different sizes and shapes of plates can be flexibly combined according to production needs, making production more flexible and diverse and meeting different production requirements.

[0114] Examples 1 to 4 and the method disclosed in CN108620435B were used as comparative examples;

[0115] The improved dimensions, shape, and yield of the obtained titanium and titanium alloy sheets are shown in Table 1, and the sheet properties are shown in Table 2.

[0116] Table 1 shows the plate dimensions and plate shapes obtained using this invention.

[0117]

[0118] Note: The yield improvement is calculated by dividing the weight of the finished slab produced from the scrap (m) by the total weight of the original slab blanks from the scrap (m).

[0119] The preparation process of the present invention can more easily achieve the same yield as the prior art. Compared with the prior art, the preparation process of the present invention is simple, the preparation process is adjustable, the controllability is stronger, and the stability and yield are higher.

[0120] Table 2. Properties of the sheet material obtained using the present invention

[0121]

[0122] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for improving the yield of hot-rolled titanium and titanium alloy plates, characterized in that, Includes the following steps: Step 1: Material screening: The specifications of the raw materials are calculated and selected based on the dimensions of the finished sheet material. The raw materials must meet the following requirements: ； ； ； ； ； ； H is the thickness of the feedstock; W is the width of the feedstock; L is the length of the feedstock; k is the effective coefficient, with a value of 0.68-0.95; h represents the thickness of the finished sheet material; w represents the width of the finished sheet material; l represents the length of the finished sheet material. The minimum thickness of the finished sheet material before the final rolling process; This refers to the deformation rate of the finished product. Design the minimum rolling width for the rolling mill; Design the minimum rolling length for the rolling mill; Step 2: Perform surface treatment on the material heads obtained in Step 1, such as peeling and polishing or sandblasting and acid washing. Step 3: Welding of the sprue parts: (1) Select a titanium plate with a plasticity not greater than that of the material head as the welding plate. The welding plate includes a first welding plate and a second welding plate. The first welding plate includes a first lap plate and a first welding part. The first lap plate is on the upper side of the right end of the material head and contacts the material head. The first welding part contacts the right side of the material head. The second welding plate includes a second lap plate and a second welding part. The second lap plate is on the lower side of the right end of the material head and contacts the material head. The second welding part contacts the right side of the material head. The dimensions of the welding plate meet the following requirements: , , The thickness of the first welded section, The thickness of the second welded section; The thickness of the overlap plate; , Width of the welded section; , This refers to the length of the welded plate; (2) The material head obtained in step two is spot welded to the first lap plate and the material head to form a whole. The material head and the second lap plate are spot welded to form a whole. The two ends of the lap plate along the width direction do not extend beyond the two ends of the material head along the width direction. Step 4: Rolling the material head: definition w represents the width of the finished sheet material. The allowance for trimming the finished board width is calculated by taking the original width W of the material head and... To make a comparison, when The weld head obtained in step three is rolled along its length to the size of the finished sheet, and then the weld plate is removed. The welded head obtained in step three is subjected to two-stage reversing rolling. The first rolling stage uses the length direction of the head as the rolling direction, extending the original length L of the head to... Then remove the welded plate, and sandblast, pickle or grind and polish the spot welded parts of the material head to remove surface defects. The second rolling process takes the length L1 after the material head is extended as the width direction of the finished plate and the original width W direction of the material head as the length direction of the finished plate. The material head is rolled along the original width W direction of the material head to the size of the finished plate. Step 5: Heat treatment of finished sheet metal: Atmospheric annealing in a roller furnace is adopted to control the annealing temperature. , For titanium and titanium alloys Temperature change, Values Insulation time h is the thickness of the finished board, C is the heat preservation time coefficient, and C is 2.0-8.0 min / mm. After the heat preservation is completed, the finished board is taken out of the furnace and air-cooled. Step 6: Perform surface treatment and slitting on the finished sheet material after heat treatment in Step 5 to obtain qualified finished titanium and titanium alloy sheets.

2. The method for improving the yield of hot-rolled titanium and titanium alloy plates as described in claim 1, characterized in that, In step three, the thickness of the overlap plate is 2-5mm, and the length of the overlap plate in contact with the material head is 5-10mm.

3. The method for improving the yield of hot-rolled titanium and titanium alloy plates as described in claim 1, characterized in that, In step three, the first and second welded plates are symmetrical along the horizontal center line of the material head.

4. The method for improving the yield of hot-rolled titanium and titanium alloy plates as described in claim 1, characterized in that, In step three, the welded plate includes a lap plate and a welded section, and the welded section includes an extension and a welded head.

5. The method for improving the yield of hot-rolled titanium and titanium alloy plates as described in claim 4, characterized in that, The material of the lap plate and the extension is the same as that of the material head.

6. The method for improving the yield of hot-rolled titanium and titanium alloy plates as described in claim 4, characterized in that, The welding head is formed into a multi-layer welding head by folding or layering and cutting.

7. The method for improving the yield of hot-rolled titanium and titanium alloy plates as described in claim 6, characterized in that, The raw material for the multi-layer welding head comes from the welding plate or the cut plate that is removed after the finished plate is pressed out.

8. The method for improving the yield of hot-rolled titanium and titanium alloy plates as described in claim 7, characterized in that, The thickness of the multi-layer welding head is 1 / 2 of the material head thickness, and the number of layers in the multi-layer welding head is 2-6. The multi-layer welding head includes a first welding head and a second welding head.

9. The method for improving the yield of hot-rolled titanium and titanium alloy plates as described in claim 8, characterized in that, The third step of the material head splicing process also includes a second material head, a third lap plate, and a fourth lap plate. The second material head is located on the right side of the multi-layer splicing head and is in contact with the right side of the multi-layer splicing head. The third lap plate is located on the upper left side of the second material head and on the right side of the first extension. The third lap plate is in contact with the second material head. The fourth lap plate is located on the lower left side of the second material head and on the right side of the second extension. The fourth lap plate is in contact with the second material head.

10. The method for improving the yield of hot-rolled titanium and titanium alloy plates as described in claim 9, characterized in that, The second material head is welded together with the third and fourth overlapping plates by spot welding.

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