阅读说明：本技术 一种ta18钛合金热连轧板卷及其酸洗工艺 (TA18 titanium alloy hot continuous rolling coil and acid cleaning process thereof ) 是由 周嘉晟 于 2021-08-09 设计创作，主要内容包括：本发明公开了一种TA18钛合金热连轧板卷及其酸洗工艺,化学成分重量百分比为：Al3.0-4.0％,V 1.5～3.0％,Fe≤0.25％,C≤0.08％,N≤0.015％,O≤0.12％,H≤0.015％,Si≤0.1％,余量为Ti元素；其工艺步骤如下：1)准备上述组分的原材料至加热炉进行加热；2)粗轧及对中；3)精轧；4)卷取：精轧后送入卷取机构进行卷取；5)开卷焊接：通过焊接机构将相邻两组钛合金板进行焊接固定,便于钛合金板整体酸洗；6)退火：通过退火机构对钛合金板进行退火处理,然后进行水冷；7)破磷抛丸；通过抛丸机对退火后的钛合金板进行抛丸处理；8)酸洗；9)烘干：通过清洗机构对酸洗后的钛合金板进行清洗,然后通过烘干系统对钛合金板进行烘干后再进行卷曲处理。本发明能够快速稳定的完成TA18的轧制,保证产品质量。(The invention discloses a TA18 titanium alloy hot continuous rolling coil and an acid cleaning process thereof, wherein the chemical components by weight percentage are as follows: 3.0-4.0% of Al, 1.5-3.0% of V, less than or equal to 0.25% of Fe, less than or equal to 0.08% of C, less than or equal to 0.015% of N, less than or equal to 0.12% of O, less than or equal to 0.015% of H, less than or equal to 0.1% of Si, and the balance of Ti; the process comprises the following steps: 1) preparing the raw materials of the components into a heating furnace for heating; 2) rough rolling and centering; 3) fine rolling; 4) coiling: after finish rolling, feeding the steel plate into a coiling mechanism for coiling; 5) uncoiling and welding: two adjacent groups of titanium alloy plates are welded and fixed through a welding mechanism, so that the titanium alloy plates are conveniently subjected to integral pickling; 6) annealing: annealing the titanium alloy plate through an annealing mechanism, and then cooling with water; 7) breaking phosphorus and performing shot blasting; performing shot blasting treatment on the annealed titanium alloy plate by using a shot blasting machine; 8) acid washing; 9) drying: and cleaning the titanium alloy plate after the pickling by using a cleaning mechanism, and then drying the titanium alloy plate by using a drying system and then performing crimping treatment. The invention can rapidly and stably finish the rolling of TA18 and ensure the product quality.)

1. A TA18 titanium alloy hot continuous rolling coil and an acid cleaning process thereof are characterized in that the titanium alloy hot continuous rolling coil comprises the following chemical components in percentage by weight: 3.0-4.0% of Al, 1.5-3.0% of V, less than or equal to 0.25% of Fe, less than or equal to 0.08% of C, less than or equal to 0.015% of N, less than or equal to 0.12% of O, less than or equal to 0.015% of H, less than or equal to 0.1% of Si, and the balance of Ti;

the process comprises the following steps:

1) preparing the raw materials of the components into a heating furnace for heating; the heating process is divided into a preheating section, a heating section and a soaking section; the thickness of the plate blank is controlled between 190 mm and 210 mm;

2) rough rolling and centering: conveying the heated titanium ingot to a roughing mill through a conveying roller, wherein a corresponding heat-insulating cover is arranged on a conveying device; then, carrying out centering transmission on the titanium alloy plate by a titanium alloy plate centering device;

3) finish rolling: the steel plate enters a finish rolling mechanism through transmission;

4) coiling: after finish rolling, feeding the steel plate into a coiling mechanism for coiling;

5) uncoiling and welding: two adjacent groups of titanium alloy plates are welded and fixed through a welding mechanism, so that the titanium alloy plates are conveniently subjected to integral pickling;

6) annealing: annealing the titanium alloy plate through an annealing mechanism, and then cooling with water;

7) breaking phosphorus and performing shot blasting; performing shot blasting treatment on the annealed titanium alloy plate by using a shot blasting machine;

8) acid washing: pickling the titanium alloy plate by using a pickling mechanism to remove oxide skins;

9) drying: and cleaning the titanium alloy plate after the pickling by using a cleaning mechanism, and then drying the titanium alloy plate by using a drying system and then performing crimping treatment.

2. The TA18 Ti alloy hot continuous rolling coil and the pickling process thereof as claimed in claim 1, wherein the temperature of the preheating section in step 1) is controlled at 550-680 ℃ and the heating time is set at 100-110 min; heating for a period of time, wherein the temperature is controlled at 820-; heating for a second period, wherein the temperature is controlled to be 930-950 ℃, and the heating time is set to be 45-55 min; a soaking section, the temperature is controlled at 940-; the total in-furnace time is 235-245 min.

3. The TA18 titanium alloy hot continuous rolling coil and the acid cleaning process thereof according to claim 1, wherein the titanium ingot is rolled for 7 times during the rough rolling in the step 2); the one-pass reduction rate is 14.5-16.5%; the reduction rate of the second pass is 16.5-18.5%; the three-pass reduction rate is 16.5-18.5%; the four-pass reduction rate is 18.5-20.5%; the five-pass reduction rate is 19.5-21.5%; the six-pass reduction rate is 19.5-21.5%; the seven-pass reduction rate is 19.5-21.5%; the thickness of the intermediate billet after rough rolling is controlled to be 40-50 mm.

4. The TA18 titanium alloy hot continuous rolling coil and the pickling process thereof as claimed in claim 1, wherein the titanium alloy plate centering device in step 2) is provided with an adjusting mechanism comprising a fixed plate, a rotating arm, a motor II, a screw II, an adjusting block, a fixed seat I and a fixed seat II; the adjusting mechanisms are arranged in a group and symmetrically fixed on the rack; the fixed plate is fixed on the frame; one side of the fixed plate is provided with a guide groove II, one end of the rotating arm is movably connected with one end of the fixed plate through a fixed seat II, one side of the rotating arm is provided with a plurality of uniformly arranged roll shafts, and the other side of the rotating arm is provided with a T-shaped groove; the motor II is fixed on the rack and positioned at one end of the fixing plate, and a chain wheel is arranged at the shaft end of the motor II; the two ends of the adjusting block are provided with a sliding block and a T-shaped block which are respectively arranged in the guide groove II and the T-shaped groove; II threaded swing joint regulating blocks of lead screw, II one ends of lead screw pass through I connection fixed plate of fixing base, and the other end is equipped with the sprocket and connects II axle head sprockets of motor through the chain.

5. The TA18 titanium alloy hot continuous rolling coil and the pickling process thereof according to claim 1, wherein the pickling process in step 8) is provided with a first mixed acid section and a second mixed acid section; the concentration of the first-stage mixed acid HNO3 is 60 +/-5 g/L, the concentration of HF is 5 +/-2 g/L, the metal ions are less than 40g/L, and the temperature is 45 +/-5 ℃; the concentration of the mixed acid second-stage HNO3 is 70 +/-5 g/L, the concentration of HF is less than 0.5g/L, the concentration of metal ions is less than 35g/L, and the temperature is 35 +/-5 ℃.

6. The TA18 titanium alloy hot continuous rolling coil and the pickling process thereof as claimed in claim 1, wherein the finish rolling start temperature in step 3) is set to 840-860 ℃; the finish rolling finishing temperature is more than 750 ℃.

Technical Field

The invention belongs to the technical field of titanium alloy production, and particularly relates to a TA18 titanium alloy hot continuous rolling coil and an acid cleaning process thereof.

Background

The nominal component of TA18 is Ti-3Al-2.5V, is an alloy with near alpha type low alloy chemical composition, has excellent corrosion resistance, weldability and cold formability, has higher mechanical strength compared with pure titanium, and has good processing performance compared with TC 4; there are a number of stabilizing elements in commercial titanium alloys, of which the most widely used alpha stabilizing element is aluminum;

however, the existing titanium alloy plate production line often has a transmission deviation phenomenon in the rolling process of the titanium alloy plate, so that the uniformity of the rolling direction cannot be realized by rough rolling and finish rolling, and the rolling effect is reduced; meanwhile, the phenomenon of unstable pickling effect often occurs in the later pickling process.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides a TA18 titanium alloy hot continuous rolling coil and an acid pickling process thereof, which can rapidly and stably finish the rolling of TA18 and ensure the product quality.

In order to achieve the purpose, the invention adopts the technical scheme that:

a TA18 titanium alloy hot continuous rolling coil and an acid cleaning process thereof comprise the following chemical components in percentage by weight: 3.0-4.0% of Al, 1.5-3.0% of V, less than or equal to 0.25% of Fe, less than or equal to 0.08% of C, less than or equal to 0.015% of N, less than or equal to 0.12% of O, less than or equal to 0.015% of H, less than or equal to 0.1% of Si, and the balance of Ti;

the process comprises the following steps:

1) preparing the raw materials of the components into a heating furnace for heating; the heating process is divided into a preheating section, a heating section and a soaking section; the thickness of the plate blank is controlled between 190 mm and 210 mm; the preheating section is controlled at the temperature of 550-680 ℃, and the heating time is set at 100-110 min; heating for a period of time, wherein the temperature is controlled at 820-; heating for a second period, wherein the temperature is controlled to be 930-950 ℃, and the heating time is set to be 45-55 min; a soaking section, the temperature is controlled at 940-; the total in-furnace time is 235-245 min.

2) Rough rolling and centering: conveying the heated titanium ingot to a roughing mill through a conveying roller, wherein a corresponding heat-insulating cover is arranged on a conveying device; carrying out 7-pass rolling on the titanium ingot during rough rolling; the one-pass reduction rate is 14.5-16.5%; the reduction rate of the second pass is 16.5-18.5%; the three-pass reduction rate is 16.5-18.5%; the four-pass reduction rate is 18.5-20.5%; the five-pass reduction rate is 19.5-21.5%; the six-pass reduction rate is 19.5-21.5%; the seven-pass reduction rate is 19.5-21.5%; the thickness of the intermediate billet after rough rolling is controlled to be 40-50 mm; and then the titanium alloy plate is centered and transmitted by a titanium alloy plate centering device, so that finish rolling is more accurate.

The titanium alloy plate centering device is provided with an adjusting mechanism which comprises a fixed plate, a rotating arm, a motor II, a screw II, an adjusting block, a fixed seat I and a fixed seat II; the adjusting mechanisms are arranged in a group and symmetrically fixed on the rack; the fixed plate is fixed on the frame; one side of the fixed plate is provided with a guide groove II, one end of the rotating arm is movably connected with one end of the fixed plate through a fixed seat II, one side of the rotating arm is provided with a plurality of uniformly arranged roll shafts, and the other side of the rotating arm is provided with a T-shaped groove; the motor II is fixed on the rack and positioned at one end of the fixing plate, and a chain wheel is arranged at the shaft end of the motor II; the two ends of the adjusting block are provided with a sliding block and a T-shaped block which are respectively arranged in the guide groove II and the T-shaped groove; II threaded swing joint regulating blocks of lead screw, II one ends of lead screw pass through I connection fixed plate of fixing base, and the other end is equipped with the sprocket and connects II axle head sprockets of motor through the chain.

3) Finish rolling: the steel plate enters a finish rolling mechanism through transmission; setting the finish rolling initial temperature to be 840-860 ℃; the finish rolling finishing temperature is more than 750 ℃.

4) Coiling: and after finish rolling, feeding the steel plate into a coiling mechanism for coiling.

5) Uncoiling and welding: two adjacent groups of titanium alloy plates are welded and fixed through a welding mechanism, so that the titanium alloy plates are conveniently subjected to integral pickling.

6) Annealing: and annealing the titanium alloy plate through an annealing mechanism, and then carrying out water cooling.

7) Breaking phosphorus and performing shot blasting; and performing shot blasting treatment on the annealed titanium alloy plate by using a shot blasting machine.

8) Acid washing: pickling the titanium alloy plate by using a pickling mechanism to remove oxide skins; the acid washing process is provided with a mixed acid first section and a mixed acid second section; the concentration of the first-stage mixed acid HNO3 is 60 +/-5 g/L, the concentration of HF is 5 +/-2 g/L, the metal ions are less than 40g/L, and the temperature is 45 +/-5 ℃; the concentration of the mixed acid second-stage HNO3 is 70 +/-5 g/L, the concentration of HF is less than 0.5g/L, the concentration of metal ions is less than 35g/L, and the temperature is 35 +/-5 ℃.

9) Drying: and cleaning the titanium alloy plate after the pickling by using a cleaning mechanism, and then drying the titanium alloy plate by using a drying system and then performing crimping treatment.

Compared with the prior art, the invention has the beneficial effects that:

1) according to the invention, the adjusting mechanism is used in the rolling process, when a titanium alloy plate enters the adjusting mechanism through the elastic correction mechanism and the control mechanism, directional adjustment is carried out according to the transmission direction, the motor II provides power to drive the screw rod II to rotate, so that the adjusting block is driven to slide along the guide groove II, the adjusting block is further used for pushing the rotating arm to rotate by taking the fixing seat II as a rotating shaft point, further the stainless steel is pushed to carry out directional adjustment or centering, and the roller shaft is beneficial to the transmission sliding of the titanium alloy plate and the reduction of resistance;

2) the pickling process section does not use a sulfuric acid pickling section in the conventional pickling process before the mixed acid first section and the mixed acid second section, does not use regenerated acid at the same time, only uses the mixed acid first section and the mixed acid second section pickling process, and carries out mixed acid according to the material proportion strictly, so that the pickling process can be quickly and rapidly completed, and the surface quality is good;

3) in the process, the addition of the aluminum element is increased, a small amount of silicon element is added, and the structure performance of the titanium alloy at high temperature is improved and stabilized.

Drawings

FIG. 1 is a schematic structural diagram of a titanium alloy plate centering device in a TA18 titanium alloy hot continuous rolling coil and a pickling process thereof;

FIG. 2 is a schematic view of the adjustment mechanism of FIG. 1;

FIG. 3 is a top view of the adjustment mechanism of FIG. 1;

in the figure: 1. a frame; 2. a control mechanism; 3. an adjustment mechanism; 301. a fixing plate; 3011. a guide groove II; 303. a rotating arm; 3031. a roll shaft; 3032. a T-shaped groove; 304. a motor II; 305. a screw II; 306. an adjusting block; 307. a fixed seat I; 308. a fixed seat II; 4. an auxiliary fixing mechanism; 5. an elastic straightening mechanism; 6. a titanium alloy plate.

Detailed Description

For the convenience of understanding of those skilled in the art, the technical solution of the present invention will be further described in detail with reference to fig. 1 to 3.

Example 1:

a TA18 titanium alloy hot continuous rolling coil and an acid cleaning process thereof comprise the following chemical components in percentage by weight: 3.52% of Al, 2.02% of V, 0.04% of Fe, 0.05% of C, 0.005% of N, 0.09% of O, 0.001% of H, 0.05% of Si, and the balance of Ti and inevitable impurities;

the process comprises the following steps:

1) preparing the raw materials of the components into a heating furnace for heating; the heating process is divided into a preheating section, a heating section and a soaking section; the thickness of the plate blank is controlled to be 195 mm; a preheating section, wherein the temperature is controlled at 610 ℃, and the heating time is set as 100 min; heating for a period of time, wherein the temperature is controlled at 825 ℃, and the heating time is set to be 50 min; heating for the second period at 945 deg.C for 55 min; a soaking section, wherein the temperature is controlled at 940 ℃, and the heating time is set to 35 min; the total in-furnace time is 240 min.

2) Rough rolling and centering: conveying the heated titanium ingot to a roughing mill through a conveying roller, wherein a corresponding heat-insulating cover is arranged on a conveying device; carrying out 7-pass rolling on the titanium ingot during rough rolling; the one-pass reduction rate is 15.5 percent; the reduction rate of the second pass is 17.25 percent; the three-pass reduction rate is 17%; the four-pass reduction rate is 18.5 percent; the five-pass reduction rate is 20.5 percent; the six-pass reduction rate is 19 percent; the seven-pass reduction rate is 20 percent; the thickness of the intermediate billet after rough rolling is controlled to be 42 mm; and then the titanium alloy plate is centered and transmitted by a titanium alloy plate centering device, so that finish rolling is more accurate.

The titanium alloy plate centering device is provided with an adjusting mechanism 3 which comprises a fixing plate 301, a rotating arm 303, a motor II 304, a lead screw II 305, an adjusting block 306, a fixed seat I307 and a fixed seat II 308; the adjusting mechanisms 3 are arranged in a group and symmetrically fixed on the rack 1; the fixing plate 301 is fixed on the frame 1; one side of the fixed plate 301 is provided with a guide groove II 3011, one end of the rotating arm 303 is movably connected with one end of the fixed plate 301 through a fixed seat II 308, one side of the rotating arm 303 is provided with a plurality of uniformly arranged roll shafts 3031, and the other side of the rotating arm 303 is provided with a T-shaped groove 3032; the motor II 304 is fixed on the rack 1 and positioned at one end of the fixing plate 301, and a chain wheel is arranged at the shaft end of the motor II 304; the two ends of the adjusting block 306 are provided with a sliding block and a T-shaped block which are respectively arranged in the guide groove II 3011 and the T-shaped groove 3032; the screw II 305 is movably connected with the adjusting block 306 through threads, one end of the screw II 305 is connected with the fixing plate 301 through the fixing seat I307, and the other end of the screw II 305 is provided with a chain wheel and is connected with a shaft end chain wheel of the motor II 304 through a chain; when a titanium alloy plate enters the adjusting mechanism through the elastic correction mechanism and the control mechanism, the titanium alloy plate is directionally adjusted according to the transmission direction, the motor II 304 provides power to drive the screw II 305 to rotate, so that the adjusting block 306 is driven to slide along the guide groove II 3011, the adjusting block 306 further pushes the rotating arm 303 to rotate by taking the fixing seat II 308 as a rotating shaft point, the titanium alloy plate 6 is further pushed to adjust or center the direction, and the roller shaft 3031 is beneficial to the transmission sliding of the titanium alloy plate 6 and resistance reduction.

When the titanium alloy plate 6 is transmitted on the frame 1, the control mechanism 2 controls the elastic correction mechanism 5 to perform primary elastic correction on the transmission of the titanium alloy plate 6, and then the auxiliary fixing mechanism 4 performs contact pressing on the upper side of the titanium alloy plate 6, so that the phenomenon that the titanium alloy plate 6 gathers to the middle to form a bulge when the adjusting mechanism 3 adjusts the titanium alloy plate 6 is avoided.

3) Finish rolling: the steel is conveyed into a finish rolling mechanism, and the finish rolling initial temperature is set to 855 ℃; the finish rolling temperature was 755 ℃.

4) Coiling: and after finish rolling, feeding the steel plate into a coiling mechanism for coiling.

5) Uncoiling and welding: two adjacent groups of titanium alloy plates are welded and fixed through a welding mechanism, so that the titanium alloy plates are conveniently subjected to integral pickling.

6) Annealing: and annealing the titanium alloy plate through an annealing mechanism, and then carrying out water cooling.

7) Breaking phosphorus and performing shot blasting; and performing shot blasting treatment on the annealed titanium alloy plate by using a shot blasting machine.

8) Acid washing: pickling the titanium alloy plate by using a pickling mechanism to remove oxide skins; the acid washing process is provided with a mixed acid first section and a mixed acid second section; the concentration of the mixed acid first-stage HNO3 is 55g/L, the concentration of HF is 3.5g/L, the metal ion is 35.5g/L, and the temperature is 42 ℃; the concentration of the mixed acid second-stage HNO3 is 68g/L, the concentration of HF is 0.45g/L, the concentration of metal ions is 30g/L, and the temperature is 38.5 ℃.

9) Drying: and cleaning the titanium alloy plate after the pickling by using a cleaning mechanism, and then drying the titanium alloy plate by using a drying system and then performing crimping treatment.

Example 2:

compared with the embodiment 1, the difference is that the temperature of the preheating section in the step 1) is controlled at 550-680 ℃, and the heating time is set as 105 min; heating for a period of time, wherein the temperature is controlled at 820-; heating for a second period, wherein the temperature is controlled to be 930-950 ℃, and the heating time is set to be 50 min; a soaking section, wherein the temperature is controlled at 940-; the total oven time is 235 min.

Compared with the example 1, the difference is that the one-pass reduction rate of the step 2) is 15.85 percent; the reduction rate of the second pass is 18 percent; the three-pass reduction rate is 17.85 percent; the four-pass reduction rate is 18.25 percent; the five-pass reduction rate is 20.5 percent; the six-pass reduction rate is 20.5 percent; the seven-pass reduction rate is 21 percent; the thickness of the intermediate billet after rough rolling is controlled to be 43.5 mm.

Example 3:

compared with the embodiment 1, the difference is that the acid cleaning process in the step 8) is provided with a mixed acid first section and a mixed acid second section; the concentration of the first-stage mixed acid HNO3 is 58g/L, the concentration of HF is 6g/L, the metal ion is 38g/L, and the temperature is 45 ℃; the concentration of the mixed acid two-stage HNO3 is 72g/L, the concentration of HF is 0.38g/L, the metal ion is 28g/L, and the temperature is 37 ℃.

The titanium alloy plates rolled in the examples are tested according to the test standard and method of GB/T3621-2007, and the obtained data is shown in the following table, meanwhile, the surface quality of the rolled titanium alloy plates is good, the plate shape is square, and the edge parts are neat and have no curled edge.

The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the present invention as defined in the accompanying claims.