High-performance TC11 tube and preparation thereof

Abstract

The invention relates to a high-performance TC11 tube and a preparation thereof. According to the preparation method, the finished product TC11 tube is prepared by firstly preparing a TC11 titanium alloy cast ingot from a first-class titanium sponge, an aluminum-vanadium alloy, an aluminum-zirconium alloy and scrap zirconium by virtue of strict control of materials and the melting process, forging the cast ingot to obtain a black-rust sheared billet, then machining and carrying out surface grinding to obtain a extruded ingot billet, drilling the ingot billet, sheathing, heating and extruding to obtain a tube billet, then carrying out hot straightening, surface treatment and heat treatment and finally machining, such as boring and turning to obtain the finished product TC11 tube. The TC11 titanium alloy tube prepared by the preparation method disclosed by the invention has the characteristics that (1) the TC11 titanium alloy tube has very high strength, ductility and impact properties; (2) the tube having relatively high tolerance level can be obtained; (3) the microstructure of the TC11 titanium alloy tube is uniform and stable; and (4) the TC11 titanium alloy tube has excellent corrosion performance. The TC11 titanium alloy tube can meet the high-standard application requirement in the petroleum industry.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to a high-performance extruded TC11 pipe and a preparation method thereof. Background technique [0002] At present, the petroleum industry generally uses steel pipes as pipelines. Due to the low strength and impact performance of steel pipes, during use, due to overload and collisions, it is easy to cause steel pipes to be scrapped or accidents. At the same time, the service life of steel pipes is very long. Short, due to corrosion and other reasons, the steel pipes in use cannot be used again after one year, and need to be replaced with new steel pipes, which increases the operating cost. [0003] TC11 titanium alloy has the advantages of high specific strength, good impact performance and good corrosion resistance. As an important aviation and aerospace material, it is widely used in compressor disks, blades and drums of aero-engines. and aircraft structures. Because TC...

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Problems solved by technology

[0004] The Chinese patent "A Titanium Alloy (TC11) Rolled Tube and Its Preparation Method" (CN103540796 A) discloses that the tube billet is prepared by cross-rolling and extrusion, and the TC11 titanium alloy tube is further prepared by rolling. The preparation method is as follows Disadvantages 1) It is only suitable for low levels of Fe and O (the content of Fe and O has a positive and strong relationship with strength), and the content of Fe and O increases, making rolling difficult; 2) There are many passes in the processing process, and each pass Annealing and pickling or alkali cleaning are required. Generally, oxidation annealing takes a long time and the productivity is low; 3) It is difficult to ensure high dimensional accuracy and shape tolerance (straightness, concentricity, etc.)

4) The annealing system adopted is difficult to achieve the joint improvement of the strong plasticity of the material, the plasticity is low, and the impact performance is poor

[0005] The Chinese patent "A Method for Composite Extrusion Preparation of Large-diameter and High-Quality Tube or Ring Billet" (CN103170797 A) discloses a composite extrusion method for difficult-to-deform materials with large deformation resistance, narrow thermal processing temperature range, and difficult thermal processing. The technology of producing TC11 titanium alloy tube billet by pressing method, which is labor-saving, energy-saving, high material utilization rate and good product quality, can effectively solve the problem of rough structure, poor uniformity and large forming force of the tube (ring) billet prepared by the traditional process. many problems

At present, there is no technology to apply TC11 titanium alloy pipes in the field of petrochemical industry

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