Preparation method of titanium alloy seamless pipe
A seamless pipe and titanium alloy technology, applied in the field of titanium alloy seamless pipe preparation, can solve the problems of uneven deformation, inconsistent deformation of pipe inner and outer diameters, large consumption of metal and tools, etc., to achieve high uniformity of structure, The effect of shortening the production cycle and reducing the cost of electricity consumption
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preparation example Construction
[0048] The invention provides a method for preparing a titanium alloy seamless pipe, comprising the following steps:
[0049] Step 1: Smelting titanium sponge and intermediate alloys to obtain titanium alloy ingots;
[0050] Step 2: heating the titanium alloy ingot obtained by smelting, and performing drawing and forging to obtain a titanium alloy billet;
[0051] Step 3: Punch through holes on the titanium alloy bar to obtain a titanium alloy hollow bar blank;
[0052]Step 4: coating the surface of the heated titanium alloy billet with a lubricant, and then extruding the titanium alloy to obtain a titanium alloy extruded tube billet;
[0053] Step 5: Carry out one-time precision forging on the titanium alloy extruded tube blank to obtain the finished tube blank;
[0054] Step 6: Carry out heat treatment on the precision forged finished tube blank, and perform straightening and machining after the heat treatment to obtain a large-diameter titanium alloy seamless tube.
Embodiment 1
[0056] Taking the production of TC4 seamless pipes with an outer diameter of φ600mm and an inner diameter of φ540mm as an example, the preparation method is as follows:
[0057] Step 1: Vacuum smelting to obtain an ingot of φ780mm;
[0058] Step 2: After the outer surface is machined and peeled off, a round ingot of φ760 is obtained;
[0059] Step 3: Above the phase transition point of the titanium alloy (T β +20~T β +50℃) and below the transformation point of titanium alloy (T β -50~T β -20°C) staggered multi-fire upsetting to obtain a φ1000mm titanium alloy billet;
[0060] Step 4: Punch through the titanium alloy bar, and obtain a titanium alloy hollow bar blank with an outer diameter of φ950mm and a central hole diameter of φ385mm after boring, and the surface roughness of the central hole of the blank is not higher than 6.3 microns;
[0061] Step 5: Tβ+50℃ electric furnace heating, heating time 240min;
[0062] Step 6: Take it out of the oven, sprinkle glass powder ...
Embodiment 2
[0067] Taking the production of TC11 seamless pipes with an outer diameter of φ480mm and an inner diameter of φ430mm as an example, the preparation method is as follows:
[0068] Step 1: Vacuum smelting to obtain an ingot of φ780mm;
[0069] Step 2: After the outer surface is machined and peeled off, a round ingot of φ760 is obtained;
[0070] Step 3: Above the phase transition point of the titanium alloy (T β +20~T β +50℃) and below the transformation point of titanium alloy (T β -50~T β -20°C) staggered multi-fire upsetting to obtain a φ900mm titanium alloy billet;
[0071] Step 4: Punch through the titanium alloy bar, and obtain a titanium alloy hollow bar blank with an outer diameter of φ870mm and a central hole diameter of φ385mm after boring, and the surface roughness of the central hole of the blank is not higher than 6.3 microns;
[0072] Step Five: T β +50℃ electric furnace heating, heating time 240min;
[0073] Step 6: Take it out of the oven, sprinkle glass p...
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