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Titanium alloy No. dfgx-9 rolled tube and preparation method thereof

A technology of dfgx-9 and titanium alloy, which is applied in the field of dfgx-9# rolling pipe and its preparation, can solve the problems of difficult processing, etc., and achieve the effects of good metal internal structure, low loss and shortened production cycle

Inactive Publication Date: 2015-04-29
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 pipes are used in oil fields, nuclear power plants, chemical industry and other industries. However, the current titanium alloy pipes are usually rolled and welded with plates, hollowed out with bars, and hinged inside the car after cross-rolling and perforation. At present, there is no one in China that can Rolled titanium alloy dfgx-9# pipe

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Concrete preparation process is as follows:

[0025] 1. dfgx-9# tube blank obtained by cross-rolling piercing (length), the inner surface of the tube blank and the mandrel (metal material, solid round bar, the rod specification depends on the tube blank or the inner diameter specification of the finished tube), add graphite lubricant, carry out warm (hot) rolling, and the online heating temperature is 800 ℃, the rolling deformation in the first pass is 25%, and the rolling speed is 30 times / min. After the rolled tube is air-cooled, it is oxidized and annealed at 700°C for 1.5 hours, and the tube after oxidation and annealed is subjected to alkali After washing and alkali washing, wash with water, check for defects and repair and scrape defects.

[0026] 2. The unilateral inner hinge of the tube billet from the first pass is 0.5mm, the inner surface and the mandrel are added with graphite lubricant, and the warm (hot) rolling is carried out. The online heating tempera...

Embodiment 2

[0032] Concrete preparation process is as follows:

[0033] 1. dfgx-9# tube blank obtained by cross-rolling piercing (length), the inner surface of the tube blank and the mandrel (metal material, solid round bar, the rod specification depends on the tube blank or the inner diameter of the finished tube), add graphite lubricant, carry out warm (hot) rolling, and the online heating temperature is 1200 ℃, the rolling deformation in the first pass is 45%, and the rolling speed is 40 times / min. After the rolled tube is air-cooled, it is oxidized and annealed at 850°C for 3 hours. After washing and alkali washing, wash with water, check for defects and repair and scrape defects.

[0034] 2. 50 inner hinges on one side of the tube billet from the first pass, graphite lubricant is added to the inner surface and mandrel, and warm (hot) rolling is carried out. The online heating temperature is 1200°C, and the rolling deformation of the second pass The rolling speed is 40%, the rollin...

Embodiment 3

[0040] Concrete preparation process is as follows:

[0041] 1. dfgx-9# tube blank obtained by cross-rolling piercing (length), add paraffin wax and molybdenum disulfide lithium-based grease lubricants to the inner and outer surfaces of the tube billet, and carry out cold rolling. The rolling deformation in the first pass is 15%, and the rolling speed is 20 times / min. The tube billet is pickled, washed with water after pickling, 50 internal hinges on one side, and the oxidation annealing temperature is 800 ° C for 2 hours. Scratch defects.

[0042] 2. Add paraffin wax and molybdenum disulfide lithium-based grease lubricant to the inner and outer surfaces of the tube billet in the first pass, and carry out cold rolling. The rolling deformation in the second pass is 30%, and the rolling speed is 30 times / min. , the rolled tube blanks are pickled, washed with water after pickling, cut the ends, and oxidized and annealed at 750 ° C for 2 hours. Scratch defects.

[0043] 3. Ad...

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PUM

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Abstract

The invention relates to titanium alloy, specifically to a titanium alloy No. dfgx-9 finished tube and its preparation method. Alloy composition of the titanium alloy No. dfgx-9 finished tube comprises, by weight, the balance Ti, 3-5% of Al, 20-24% of V, Fe being less than or equal to 0.1%, C being less than or equal to 0.1%, N being less than or equal to 0.03%, H being less than or equal to 0.015% and O being less than or equal to 0.12%. The titanium alloy No. dfgx-9 rolled tube has good performance, uniform metallographic structure and good tube surface quality. During warm / cold rolling of a tube billet, online or off-line heating of the tube billet is carried out for rolling, wherein online heating temperature is 400-1200 DEG C; thermal insulation lasts 0-90 min; per-pass deformation is 15-85%; rolling velocity is (20-90) times / min; and a finished product is produced after 1-10 passes of rolling. According to properties of the titanium alloy No. dfgx-9 tube, tensile strength is 680-1300 MPa, ductility is 8-25%, and a metallographic structure is uniform. Two metallographic structures of stress annealing and perfect recrystallization annealing are eliminated.

Description

technical field [0001] The invention relates to a titanium alloy pipe and its preparation, in particular to a dfgx-9# rolling 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 pipes are used in oil fields, nuclear power plants, chemical industry and other industries. However, the current titanium alloy pipes are usually rolled and welded with plates, hollowed out with bars, and hinged inside the car after cross-rolling and perforation. At present, there is no one in China that can Rolled titanium alloy dfgx-9# pipe. Contents of the invention [0003] The object of the present invention is to provide a kin...

Claims

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Application Information

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IPC IPC(8): C22C14/00C22F1/18B21C37/06
Inventor 张忠世郭淑君张政宏
Owner 忠世高新材料股份有限公司
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