A process for producing TA5 titanium alloy hot-rolled coil

Abstract

The present invention discloses a process for producing TA5 titanium alloy hot-rolled coils. A heating furnace heats raw slabs in a segmented heating process, divided into five heating furnace zones: preheating, primary heating, secondary heating, soaking, and discharge. The heating time is 20-50 minutes for the preheating zone, 30-55 minutes for the primary heating zone, 30-55 minutes for the secondary heating zone, and 90-130 minutes for the soaking zone. The present invention relates to the field of hot-rolled coil production, and specifically to a process for producing TA5 titanium alloy hot-rolled coils.

Description

Technical Field

[0001] The present invention relates to the field of hot-rolled coil production, and in particular to a process for producing TA5 titanium alloy hot-rolled coil. Background Art

[0002] Currently, the main forming methods of TA5 titanium alloy are forging or medium plate rolling, which have low production efficiency and low yield rate. The hot rolling coil production process has the characteristics of high production efficiency and high yield rate, but there is currently no case of using hot rolling mills to produce TA5 coils in China. The reasons are:

[0003] (1) There is no suitable heating process available to make the temperature inside and outside the raw material slab uniform;

[0004] (2) When the heating target temperature is too high, the product structure is coarse, affecting the performance. When the heating temperature is too low, the rolling mill capacity is limited and there is a rolling risk. Currently, there is no suitable heating target process available.

[0005] (3) The buckling of the rough rolling process can easily lead to scrapping, and there is currently no suitable rough rolling process available;

[0006] (4) TA5 alloy has a temperature range of sudden change in flow stress (850℃~900℃), which can easily cause unstable finishing rolling, eventually resulting in scrap, inaccurate thickness control or poor plate quality. Currently, there is no suitable finishing rolling process to solve the above problems;

[0007] (5) There is no suitable winding tension available to ensure that the roll shape is stable and controllable. Summary of the Invention

[0008] The technical problems to be solved by the present invention are the five deficiencies mentioned in the background technology.

[0009] To solve the above problems, the technical solution adopted by the present invention is as follows: The present invention is a process for producing TA5 titanium alloy hot-rolled coil, comprising the following steps:

[0010] Step 1: The heating furnace heats the raw material slab in a segmented heating process, which is divided into five heating furnace zones: preheating zone, first heating zone, second heating zone, soaking zone, and discharge zone. The specific time is 20-50 minutes for preheating zone, 30-55 minutes for first heating zone, 30-55 minutes for second heating zone, and 90-130 minutes for soaking zone.

[0011] Step 2: rough rolling to achieve preliminary thinning, rolling pass R1 rolling speed 0.8-2.0m / s, asynchronous rate 1.01-1.15, reduction rate 10-15%, rolling temperature 985-1035℃ and no dephosphorization water, rolling pass R2 rolling speed 1.5-2.5m / s, asynchronous rate 1.02-1.12, reduction rate 20-25%, rolling temperature 975-1025℃ and no dephosphorization water, rolling pass R3 rolling speed 2.0-3.0m / s, asynchronous rate 1.02-1.08, reduction rate 20-30%, rolling temperature 960-1010℃ and dephosphorization water is not turned on, rolling pass R4 rolling speed 2.5-4.0m / s, asynchronous rate 1.03-1.09, reduction rate 25-35%, rolling temperature 940-990℃ and dephosphorization water is not turned on, rolling pass R5 rolling speed 2.5-5.0m / s, asynchronous rate 1.02-1.10, reduction rate 30-40%, rolling temperature 900-950℃ and dephosphorization water is not turned on;

[0012] Step three, finishing rolling to achieve secondary thinning and reach the target specifications, the finishing rolling stands are divided into F1, F2, F3, F4, F5, F6 and F7, set five parameters rolling speed, reduction rate, looper tension, start rolling temperature and final rolling temperature, finishing rolling stand F1 rolling speed 0.6-1.0m / s, reduction rate 20-28%, looper tension 3.5-6Mpa and start rolling temperature 900-950℃, finishing rolling stand F2 rolling speed 0.8-1.2m / s, reduction rate 24-30% and looper tension 4-7Mpa, finishing rolling stand F3 rolling speed 1.2-1.5m / s, reduction rate 20-30% and looper tension 4-7Mpa, finishing mill F4 rolling speed 1.6-1.9m / s, reduction rate 20-26% and looper tension 8-12Mpa, finishing mill F5 rolling speed 2.0-3.0m / s, reduction rate 10-20% and looper tension 10-14Mpa, finishing mill F6 rolling speed 3.0-4.0m / s, reduction rate 10-15% and looper tension 10-15Mpa, finishing mill F7 rolling speed 4.0-5.0m / s, reduction rate 5-15% and final rolling temperature 850-900℃;

[0013] Step 4: Coil the rolled plate and set the four parameters: pinch roll pressure 110-130 MPa, mandrel tension 15-25 MPa, no cooling water required, and side guide pressure 3-8 MPa.

[0014] The beneficial effects achieved by the present invention using the above structure are as follows:

[0015] In step 1, the heating furnace heats the raw material slab. After parameter setting, the following two problems can be solved: (1) There is no suitable heating process technology available to make the temperature inside and outside the raw material slab uniform; (2) When the heating target temperature is too high, the product structure is coarse, affecting the performance; when the heating temperature is too low, the rolling mill capacity is limited and there is a rolling risk. Currently, there is no suitable heating target process available.

[0016] Step 2: Rough rolling is used to achieve initial thinning. Parameter setting is used to solve the problem of curling and scrapping during the rough rolling process. Currently, there is no suitable rough rolling process available.

[0017] Step three: finishing rolling achieves secondary thinning and reaches the target specifications. Parameter setting solves the problem of sudden change in flow stress temperature range (850℃~900℃) of TA5 alloy, which easily causes unstable finishing rolling, and ultimately leads to scrap, inaccurate thickness control or poor plate quality.

[0018] Step 4: Coil the rolled plate. After parameter setting, the problem of no suitable coiling tension can be solved to ensure that the coil shape is stable and controllable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of a process for producing TA5 titanium alloy hot-rolled coils proposed by the present invention;

[0020] Figure 2 This is a schematic diagram of heating furnace parameters for producing TA5 titanium alloy hot-rolled coils proposed in the present invention;

[0021] Figure 3 A schematic diagram of rough rolling parameters for producing TA5 titanium alloy hot-rolled coils proposed in the present invention;

[0022] Figure 4 This is a schematic diagram of the finishing rolling parameters for producing TA5 titanium alloy hot-rolled coils proposed in the present invention. DETAILED DESCRIPTION

[0023] Example 1, a process for producing TA5 titanium alloy hot-rolled coil, comprising the following steps:

[0024] Step 1: The heating furnace heats the raw material slab. Figure 1 As shown, a segmented heating process is carried out, which is divided into five heating furnace areas: preheating, first heating, second heating, soaking and unloading. The specific time is 20 minutes for preheating, 30 minutes for first heating, 30 minutes for second heating and 90 minutes for soaking.

[0025] Step 2: rough rolling to achieve initial thinning, such as Figure 2As shown, the rolling pass R1 has a rolling speed of 0.8 m / s, an asynchronous ratio of 1.01, a reduction ratio of 10%, a rolling temperature of 985°C, and dephosphorization water is not turned on; the rolling pass R2 has a rolling speed of 1.5 m / s, an asynchronous ratio of 1.02, a reduction ratio of 20%, a rolling temperature of 975°C, and dephosphorization water is not turned on; the rolling pass R3 has a rolling speed of 2.0 m / s, an asynchronous ratio of 1.02, a reduction ratio of 20%, a rolling temperature of 960°C, and dephosphorization water is not turned on; the rolling pass R4 has a rolling speed of 2.5 m / s, an asynchronous ratio of 1.03, a reduction ratio of 25%, a rolling temperature of 940°C, and dephosphorization water is not turned on; the rolling pass R5 has a rolling speed of 2.5 m / s, an asynchronous ratio of 1.02, a reduction ratio of 30%, a rolling temperature of 900°C, and dephosphorization water is not turned on;

[0026] Step 3: Finish rolling to achieve secondary thinning and reach the target specifications, such as Figure 3 As shown, the finishing mill stands are divided into F1, F2, F3, F4, F5, F6 and F7, and five parameters are set: rolling speed, reduction rate, looper tension, start rolling temperature and final rolling temperature. The rolling speed of the finishing mill stand F1 is 0.6m / s, the reduction rate is 20%, the looper tension is 3.5Mpa and the start rolling temperature is 900℃. The rolling speed of the finishing mill stand F2 is 0.8m / s, the reduction rate is 24% and the looper tension is 4Mpa. The rolling speed of the finishing mill stand F3 is 1.2m / s, reduction rate of 20% and looper tension of 4Mpa, finishing mill F4 rolling speed of 1.6m / s, reduction rate of 20% and looper tension of 8Mpa, finishing mill F5 rolling speed of 2.0m / s, reduction rate of 10% and looper tension of 10Mpa, finishing mill F6 rolling speed of 3.0m / s, reduction rate of 10% and looper tension of 10Mpa, finishing mill F7 rolling speed of 4.0m / s, reduction rate of 5% and final rolling temperature of 850℃;

[0027] Step 4: coiling the rolled plate. Figure 4 As shown, the four parameters are set as follows: pinch roller pressure 110 MPa, core shaft tension 15 MPa, no cooling water required and side guide pressure 3 MPa.

[0028] Example 2, a process for producing TA5 titanium alloy hot-rolled coil, comprising the following steps:

[0029] Step 1: The heating furnace heats the raw material slab. Figure 1 As shown, a segmented heating process is carried out, which is divided into five heating furnace areas: preheating, first heating, second heating, soaking and unloading. The specific time is 50 minutes for preheating, 55 minutes for first heating, 55 minutes for second heating and 130 minutes for soaking.

[0030] Step 2: rough rolling to achieve initial thinning, such as Figure 2As shown, the rolling pass R1 has a rolling speed of 2.0 m / s, an asynchronous ratio of 1.15, a reduction ratio of 15%, a rolling temperature of 1035°C, and no dephosphorization water is turned on; the rolling pass R2 has a rolling speed of 2.5 m / s, an asynchronous ratio of 1.12, a reduction ratio of 25%, a rolling temperature of 1025°C, and no dephosphorization water is turned on; the rolling pass R3 has a rolling speed of 3.0 m / s, an asynchronous ratio of 1.08, a reduction ratio of 30%, a rolling temperature of 1010°C, and no dephosphorization water is turned on; the rolling pass R4 has a rolling speed of 4.0 m / s, an asynchronous ratio of 1.09, a reduction ratio of 35%, a rolling temperature of 990°C, and no dephosphorization water is turned on; the rolling pass R5 has a rolling speed of 5.0 m / s, an asynchronous ratio of 1.10, a reduction ratio of 40%, a rolling temperature of 950°C, and no dephosphorization water is turned on;

[0031] Step 3: Finish rolling to achieve secondary thinning and reach the target specifications, such as Figure 3 As shown in the figure, the finishing mill stands are divided into F1, F2, F3, F4, F5, F6 and F7, and five parameters are set: rolling speed, reduction rate, looper tension, start rolling temperature and final rolling temperature. The rolling speed of the finishing mill stand F1 is 1.0m / s, the reduction rate is 28%, the looper tension is 6Mpa and the start rolling temperature is 950℃. The rolling speed of the finishing mill stand F2 is 1.2m / s, the reduction rate is 30% and the looper tension is 7Mpa. The rolling speed of the finishing mill stand F3 is 1.5m / s, the reduction rate is 100% and the looper tension is 10Mpa. The rolling speed of the finishing stand F4 is 1.9 m / s, the reduction rate is 26%, and the looper tension is 12 MPa. The rolling speed of the finishing stand F5 is 3.0 m / s, the reduction rate is 20%, and the looper tension is 14 MPa. The rolling speed of the finishing stand F6 is 4.0 m / s, the reduction rate is 10-15%, and the looper tension is 15 MPa. The rolling speed of the finishing stand F7 is 5.0 m / s, the reduction rate is 15%, and the final rolling temperature is 900 ° C.

[0032] Step 4: coiling the rolled plate. Figure 4 As shown, the four parameters are set as pinch roller pressure 130 MPa, core shaft tension 25 MPa, no cooling water required and side guide pressure 8 MPa.

[0033] Example 3, a process for producing TA5 titanium alloy hot-rolled coil, comprising the following steps:

[0034] Step 1: The heating furnace heats the raw material slab. Figure 1 As shown, a segmented heating process is carried out, which is divided into five heating furnace areas: preheating, first heating, second heating, soaking and unloading. The specific time is 30 minutes for preheating, 40 minutes for first heating, 40 minutes for second heating and 100 minutes for soaking.

[0035] Step 2: rough rolling to achieve initial thinning, such as Figure 2As shown, the rolling pass R1 has a rolling speed of 1.0 m / s, an asynchronous ratio of 1.05, a reduction ratio of 12%, a rolling temperature of 1000°C, and dephosphorization water is not turned on; the rolling pass R2 has a rolling speed of 1.8 m / s, an asynchronous ratio of 1.06, a reduction ratio of 22%, a rolling temperature of 995°C, and dephosphorization water is not turned on; the rolling pass R3 has a rolling speed of 2.5 m / s, an asynchronous ratio of 1.05, a reduction ratio of 25%, a rolling temperature of 990°C, and dephosphorization water is not turned on; the rolling pass R4 has a rolling speed of 3.0 m / s, an asynchronous ratio of 1.05, a reduction ratio of 30%, a rolling temperature of 960°C, and dephosphorization water is not turned on; the rolling pass R5 has a rolling speed of 3.5 m / s, an asynchronous ratio of 1.05, a reduction ratio of 35%, a rolling temperature of 930°C, and dephosphorization water is not turned on;

[0036] Step 3: Finish rolling to achieve secondary thinning and reach the target specifications, such as Figure 3 As shown, the finishing stands are divided into F1, F2, F3, F4, F5, F6 and F7, and five parameters are set: rolling speed, reduction rate, looper tension, start rolling temperature and final rolling temperature. The rolling speed of the finishing stand F1 is 0.8m / s, the reduction rate is 22%, the looper tension is 5Mpa and the start rolling temperature is 930℃. The rolling speed of the finishing stand F2 is 1.0m / s, the reduction rate is 25% and the looper tension is 6Mpa. The rolling speed of the finishing stand F3 is 1.3m / s , reduction rate 22% and looper tension 6Mpa, finishing mill F4 rolling speed 1.7m / s, reduction rate 21% and looper tension 9Mpa, finishing mill F5 rolling speed 2.2m / s, reduction rate 16% and looper tension 11Mpa, finishing mill F6 rolling speed 3.5m / s, reduction rate 13% and looper tension 13Mpa, finishing mill F7 rolling speed 4.5m / s, reduction rate 10% and final rolling temperature 880℃;

[0037] Step 4: coiling the rolled plate. Figure 4 As shown, the four parameters are set as follows: pinch roller pressure 120 MPa, core shaft tension 20 MPa, no cooling water required and side guide pressure 6 MPa.

[0038] It should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A process for producing TA5 titanium alloy hot-rolled coil, comprising the following steps, characterized in that: Step 1: The heating furnace heats the raw material slab in a segmented heating process, which is divided into five heating furnace zones: preheating zone, first heating zone, second heating zone, soaking zone, and discharge zone. The specific time is 20-50 minutes for preheating zone, 30-55 minutes for first heating zone, 30-55 minutes for second heating zone, and 90-130 minutes for soaking zone. Step 2: rough rolling to achieve preliminary thinning, rolling pass R1 rolling speed 0.8-2.0m / s, asynchronous rate 1.01-1.15, reduction rate 10-15%, rolling temperature 985-1035℃ and no dephosphorization water, rolling pass R2 rolling speed 1.5-2.5m / s, asynchronous rate 1.02-1.12, reduction rate 20-25%, rolling temperature 975-1025℃ and no dephosphorization water, rolling pass R3 rolling speed 2.0-3.0m / s, asynchronous rate 1.02-1.08, reduction rate 20-30%, rolling temperature 960-1010℃ and dephosphorization water is not turned on, rolling pass R4 rolling speed 2.5-4.0m / s, asynchronous rate 1.03-1.09, reduction rate 25-35%, rolling temperature 940-990℃ and dephosphorization water is not turned on, rolling pass R5 rolling speed 2.5-5.0m / s, asynchronous rate 1.02-1.10, reduction rate 30-40%, rolling temperature 900-950℃ and dephosphorization water is not turned on; Step three, finishing rolling to achieve secondary thinning and reach the target specifications, the finishing rolling stands are divided into F1, F2, F3, F4, F5, F6 and F7, set five parameters rolling speed, reduction rate, looper tension, start rolling temperature and final rolling temperature, finishing rolling stand F1 rolling speed 0.6-1.0m / s, reduction rate 20-28%, looper tension 3.5-6Mpa and start rolling temperature 900-950℃, finishing rolling stand F2 rolling speed 0.8-1.2m / s, reduction rate 24-30% and looper tension 4-7Mpa, finishing rolling stand F3 rolling speed 1.2-1.5m / s, reduction rate 20-30% and looper tension 4-7Mpa, finishing mill F4 rolling speed 1.6-1.9m / s, reduction rate 20-26% and looper tension 8-12Mpa, finishing mill F5 rolling speed 2.0-3.0m / s, reduction rate 10-20% and looper tension 10-14Mpa, finishing mill F6 rolling speed 3.0-4.0m / s, reduction rate 10-15% and looper tension 10-15Mpa, finishing mill F7 rolling speed 4.0-5.0m / s, reduction rate 5-15% and final rolling temperature 850-900℃; Step 4: Coil the rolled plate and set the four parameters: pinch roll pressure 110-130 MPa, mandrel tension 15-25 MPa, no cooling water required, and side guide pressure 3-8 MPa.

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