Titanium alloy TC4 hot-rolled tube and production method thereof

A titanium alloy and hot-rolled tube technology, applied in the field of titanium alloy tube and its preparation, can solve the problems of difficult processing, difficult processing, no equipment, etc., and achieve the effect of high yield, good surface quality and fast speed

Active Publication Date: 2010-09-08
忠世高新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Concrete preparation process is as follows:

[0035] 1. Made of TC4 tube blank Graphite emulsion lubricant is added to the inner and outer surfaces of the tube billet, heated online at 950°C for 5 minutes, and then rolled. The rolling deformation in the first pass is 53%, and the rolling speed is 70 times / min. After air cooling, the oxide film and defects are repaired. .

[0036] 2. Add graphite emulsion lubricant to the inner and outer surfaces of the tube billet that comes down from the first pass, heat it online at 900°C for 6 minutes, and then roll it. The rolling deformation in the second pass is 43%, and the rolling speed is 50 times / min. After air-cooling, repair and scrape the oxide film and defects, and twist 60 times on one side.

[0037] 3. Add graphite emulsion lubricant to the inner and outer surfaces of the tube billet in the second pass, heat it online at 800°C for 6 minutes, and carry out rolling. The rolling deformation in the third pass is 42%, and ...

Embodiment 2

[0041] Concrete preparation process is as follows:

[0042] 1. Made of TC4 tube blank The pipe blank is twisted 80 times on one side, the inner and outer surfaces of the tube blank are added with graphite emulsion lubricant, heated online at 1200°C for 25 minutes, and then rolled. The rolling deformation in the first pass is 40.2%, and the finished product is rolled out Rolling speed 60 times / min, pickling after air-cooled alkaline washing

[0043] 3. Finished product Oxidation and annealing at 800°C for 2.5 hours, air cooling, sampling and analysis, the performance was measured as Rm1100MPa, Rp0.2 1010MPa, A 13.5%;

[0044] or, finished Vacuum annealing at 750°C, heat preservation for 2.5 hours, cooling with the furnace, sampling and analysis of its performance measured as Rm1060MPa, Rp0.2 980MPa, A 12%.

Embodiment 3

[0046]Concrete preparation process is as follows:

[0047] 1. Made of TC4 tube blank Add glass powder lubricant to the inner and outer surfaces of the tube blank, heat on-line at 800°C for 5 minutes, and then roll. The rolling deformation in the first pass is 65%, and the rolling speed is 40 times / min. After air cooling, the oxide film and defects are repaired. , twisted 50 times on one side.

[0048] 2. Add glass powder lubricant to the inner and outer surfaces of the tube billet coming down from the first pass, heat it online at 750°C for 8 minutes, and then roll it. The rolling deformation of the second pass is 60%, and the rolling speed is 50 times / min. After air cooling, repair and scrape the oxide film and defects.

[0049] 3. Add glass powder lubricant to the inner and outer surfaces of the tube billet coming down from the second pass, heat it online at 700°C for 10 minutes, and then roll it. The rolling deformation of the third pass is 55%, and the rolling speed is ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L9/02C22C14/00
Inventor 张忠世郭淑君孙雪梅张政宏
Owner 忠世高新材料股份有限公司
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