Large-caliber thin-wall Ti35 titanium alloy seamless pipe and preparation method thereof

[0028] Example 1

[0029] The large diameter thin wall Ti35 titanium alloy seamless pipe of the present embodiment consists of the following mass content: Ta 5.6%, Fe0.01%, C 0.018%, N 0.003%, H 0.0011%, O 0.10%, and the margin is Titanium and inevitable impurities;

[0030] The method of preparing the large diameter thin wall Ti35 titanium alloy seamless pipe of the present embodiment includes the steps of:

[0031] Step 1, the billet was prepared: 5 rods of Ti35 titanium alloy ingots having a diameter of 640 mm were performed to obtain a bar blank having a diameter of 570 mm;

[0032] Step 2, the billet was prepared: The billet obtained in the step first was placed in the heating furnace at 600 ° C for 1 h, then continued to heat up to 800 ° C for 2 h, then warmed to 960 ° C for 3 hours, afterward, the diameter was performed. 580mm, wall thickness is 50 mm, a mass of greater than 6000 mm;

[0033] Step three, the tube billet treatment: Take a homogenized treatment in step I 2 homog

[0037] Example 2

[0038] The large diameter thin wall Ti35 titanium alloy seamless pipe of this embodiment consists of the following mass content: Ta 6.48%, Fe 0.023%, C 0.012%, N 0.090%, and the remaining amount is titanium. And inevitable impurities;

[0039] The method of preparing the large diameter thin wall Ti35 titanium alloy seamless pipe of the present embodiment includes the steps of:

[0040] Step 1, the billet preparation: 7-flaud forged Ti35 titanium alloy ingot with a diameter of 640 mm is performed to obtain a bar blank having a diameter of 200 mm;

[0041] Step 2, the billet was prepared: The billet obtained in the step one was placed in the heating furnace at 600 ° C for 1 h, then continued to warm up to 800 ° C for 1 h, then warmed to 860 ° C for 2 h, then the diameter was perforated. It is 210mm, a wall thickness of 22 mm, a length of greater than 6000 mm;

[0042] Step 3, the tube blank: The segment obtained in step II is homogenized at 850 ° C insulation for 2 ho

[0046] Example 3

[0047] The large diameter thin wall Ti35 titanium alloy seamless pipes of the present embodiment consists of the following mass content: Ta 6.2%, Fe0.013%, C 0.012%, N 0.089%, and the remaining amount is Titanium and inevitable impurities;

[0048] The method of preparing the large diameter thin wall Ti35 titanium alloy seamless pipe of the present embodiment includes the steps of:

[0049] Step 1, the billet is prepared: 6-flake forging in a Ti35 titanium alloy ingot having a diameter of 640 mm is performed to obtain a bar blank having a diameter of 400 mm;

[0050] Step 2, the billet was prepared: The billet obtained in the step one was placed in the heating furnace at 600 ° C for 1 h, then continued to warm up to 800 ° C for 1 h, then warmed to 860 ° C for 2 h, then the diameter was perforated. Take 410mm, wall thickness of 55 mm, a mass of greater than 4000 mm;

[0051] Step three, tube blank: Take a homogenized treatment in step I 2 homogenize at 900 ° C, afte