Titanium alloy TC4 hot-rolled tube and production method thereof

Abstract

The invention relates to a titanium alloy, in particular to a titanium alloy TC4 hot-rolled tube and a production method thereof. By weight, the composition of the alloy is as follows: the balance of Ti, 5.5 percent to 6.75 percent of Al, 3.5 percent to 4.5 percent of V, less than or equal to 0.1 percent of Fe, less than or equal to 0.1 percent of C, less than or equal to 0.03 percent of N, less than or equal to 0.015 percent of H and less than or equal to 0.15 percent of O. A tube blank is heated and rolled on line, the on-line heating temperature is 600 DEG C to 1200 DEG C, and is kept for 1 to 45 minutes, the deformation at each pass is 15 percent to 85 percent, the rolling speed is 20 to 90 times / min, a finished product is produced after 1 to 10 times of rolling, the rolled finished product is annealed in oxygen or vacuum, the annealed finished product is washed by alkali and acid or acid and then by water, and thereby the product is obtained. The tensile strength of the titanium alloy tube is 895MPa to 1300MPa, the elongation of the titanium alloy tube is 8 percent to 25 percent, the metallographic structure is uniform, and a stress-relief annealed metallographic structure and a fully recrystalization annealed metallographic structure can be obtained.

Description

technical field [0001] The invention relates to a titanium alloy pipe and its preparation, in particular to a TC4 hot (or warm) rolled pipe and its preparation method. Background technique [0002] With the continuous development of titanium alloys, there is an increasing demand for titanium alloys with high strength, high toughness, high temperature resistance and corrosion resistance, especially the demand for titanium alloy pipes is increasing, and the processing of titanium alloy pipes is becoming more and more difficult. Most of the titanium alloy TC4 pipes are used in oil fields, nuclear power plants, chemical industry and other industries. However, the current titanium alloy TC4 pipes are usually rolled and welded by plates, hollowed out by bars, twisted outside the car after cross-rolling and piercing. At present, domestic rolling The production of titanium alloy TC4 pipes is very difficult to process, and there is no corresponding forming equipment. Contents of th...

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Problems solved by technology

[0002] With the continuous development of titanium alloys, there is an increasing demand for titanium alloys with high strength, high toughness, high temperature resistance and corrosion resistance, especially the demand for titanium alloy pipes is increasing, and the processing of titanium alloy pipes is becoming more and more difficult. Most of the titanium alloy TC4 pipes are used in oil fields, nuclear power plants, chemical industry and other industries. However, the current titanium alloy TC4 pipes are usually rolled and welded by plates, hollowed out by bars, twisted outside the car after cross-rolling and piercing. At present, domestic rolling It is very difficult to process titanium alloy TC4 pipes, and there is no corresponding forming equipment