Titanium alloy seamless tube and manufacturing method thereof

Abstract

The present invention belongs to the technical field of titanium alloy and the manufacturing method thereof and discloses a titanium alloy seamless tube and the manufacturing method thereof. The invention is mainly characterized by comprising a tube body. The tube body comprises the following components by weight: 90 parts of Ti, 3.5-4.5 parts of V, 5.5-6.5 parts of Al, 0.08-0.12 parts of Ru, 0.28 or fewer parts of Fe, 0.13 or fewer parts of O, 0.07 or fewer parts of C, 0.03 or fewer parts of N, and 0.015 or fewer parts of H. An anti-oxidation coating layer is repeatedly and uniformly coated on the blank material, and then is subjected to the operations of heating, skew-rolling, perforating, deforming, heating, tube-rolling and deforming at the temperature of 850-780 DEG C. Meanwhile, the multi-pass reducing and sizing deformation is conducted at the temperature of 850-780 DEG C, and then the straightening and shot-blasting treatment is finally conducted to obtain the finished products of titanium alloy tubes. The titanium alloy seamless tube and the manufacturing method are simple in process, more environmentally-friendly in manufacturing process, and wider in the dimension range of manufactured titanium alloy tubes. Manufactured products are good in microstructure and mechanical properties, and manufactured titanium alloy tubes have fewer surface defects. Manufactured titanium alloy seamless tubes are good in machining performance, such as low cost, easy forging and corrosion resistance, thus being widely applicable to complex corrosion environments.

Description

technical field [0001] The invention belongs to the technical field of seamless pipes and manufacturing methods thereof, and in particular relates to a titanium alloy seamless pipe and a manufacturing method thereof. Background technique [0002] Titanium alloy is an important structural material developed in the 1950s. Titanium alloy is an alloy composed of Ti as the matrix and other elements. Titanium and titanium alloys have low density, high specific strength, high temperature resistance, corrosion resistance, Non-magnetic, good biocompatibility and other excellent comprehensive properties have been widely used in aviation, aerospace, ships, weapons, petroleum, chemical, medical and other fields, and have been highly valued by countries all over the world. [0003] Titanium and titanium alloys have many excellent properties, which are mainly reflected in the following aspects: [0004] 1) High specific strength, titanium alloy has very high strength, its tensile strengt...

AI Technical Summary

Problems solved by technology

[0005] 2) Higher hardness, the hardness of titanium alloy (annealed state) is HRC32~38

[0006] 3) Low elastic modulus, the elastic modulus of titanium alloy (annealed state) is 107.8~117.6Gpa, about half of steel and stainless steel, easy to bend

[0009] 6) Titanium has a strong tendency to passivate

The method has the advantages of high surface quality, high dimensional accuracy, and good performance uniformity of titanium or titanium alloy tubes; the disadvantage is that strong acid is often used for surface treatment (such as the use of HF in the patent publication CN 104308461A). 2 acid and HNO 3 ), pickling is easy to cause environmental pollution, long manufacturing cycle, high energy consumption per unit of production, low yield and high production cost

However, the existence of welds affects the consistency of its circumferential performance, which limits the application range of titanium alloy welded pipes; in addition, the roundness of welded pipes is lower than that of seamless pipes. Limited by welding methods, welding methods are mostly used to manufacture thin wall tubing