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Large-diameter titanium alloy seamless pipe and its preparation method

A seamless pipe and titanium alloy technology, applied in the field of large-diameter titanium alloy seamless pipe and its preparation, can solve the problems of high production cost, limited application of alloy pipe, immature rolling process, etc., and achieve low cost of production equipment , Simple and controllable two-phase zone deformation, deformation temperature are easy to control the effect

Active Publication Date: 2021-07-02
湖南湘投金天钛业科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the domestic Ti75 alloy large-diameter seamless pipe rolling process is not yet mature, and the production cost is high, which has brought certain restrictions on the wide application of this alloy pipe.

Method used

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  • Large-diameter titanium alloy seamless pipe and its preparation method
  • Large-diameter titanium alloy seamless pipe and its preparation method
  • Large-diameter titanium alloy seamless pipe and its preparation method

Examples

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preparation example Construction

[0032] One embodiment of the present invention provides a method for preparing a large-diameter titanium alloy seamless pipe. The process route is: billet forging → dynamic recrystallization heat treatment processing → forging processing below the β transformation temperature → billet making → mandrel drawing below the β transformation temperature And hole expansion → roll forming below the β transition temperature, specifically including the following steps 1 to 5.

[0033] Step 1), using a titanium alloy ingot of Φ660 mm to Φ780 mm as a billet to carry out billet forging.

[0034] One step further, the titanium alloy ingot is Ti75 alloy ingot.

[0035] Further, the titanium alloy ingot is a Φ780mm Ti75 alloy ingot.

[0036] Further, the step of billet forging is to perform 1-2 times of upsetting forging on the titanium alloy ingot at a temperature of 100° C. to 250° C. above the β transformation temperature of the titanium alloy ingot.

[0037] The coarse as-cast structure...

Embodiment 1

[0064] Example 1: Preparation of a Ti75 alloy seamless pipe with a specification of Φ680mm

[0065] 1), blank forging

[0066] The Φ780mm Ti75 alloy ingot with a β transformation temperature of 945°C was used as the raw material for 2 times of upsetting and drawing forging.

[0067] Among them, the temperature of 1-fire forging is 1150°C, two upsetting and two drawing forging to □620mm ("□620mm" means "a square ingot with a side length of 620mm), the forging ratio is 6.25, and air cooling is used after forging; the temperature of 2-fire forging The temperature is 1100℃, forging to □620mm with one upsetting and one drawing, the forging ratio is 2.5, and air cooling is used after forging.

[0068] 2), dynamic recrystallization heat treatment

[0069] Carry out double upsetting and two drawing forging to □620mm for the blank processed in step 1), the forging temperature is 915°C, and the forging ratio is controlled at 6.0; after forging, it is directly returned to the furnace f...

Embodiment 2

[0081] Example 2: Preparation of Ti75 alloy seamless pipe with a specification of Φ600mm

[0082] 1), blank forging

[0083] A Φ780mm Ti75 alloy ingot with a β transformation temperature of 950°C was used for two times of upsetting and drawing forging.

[0084] Among them, the temperature of 1-fire forging is 1150℃, two upsetting and two drawing forging to □620mm, the forging ratio is 6.25, and air cooling is used after forging; 2.5, air cooling is used after forging.

[0085] 2), dynamic recrystallization heat treatment

[0086] Carry out double upsetting and two drawing forging to □620mm for the blank processed in step 1), the forging temperature is 920°C, and the forging ratio is controlled at 6.0; after forging, it is directly returned to the furnace for recrystallization heat treatment, the recrystallization heat treatment temperature is 1040°C, and the heat preservation After 300 minutes, it was released from the furnace, and then forged with one upsetting and one dra...

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Abstract

The invention relates to a large-diameter titanium alloy seamless pipe and a preparation method thereof. The preparation method comprises the following steps: 1) using a titanium alloy ingot of Φ660 mm to Φ780 mm as a blank for blank forging; 2) casting the titanium alloy The β-transition temperature of the ingot is 20°C to 50°C, and the billet processed in step 1) is subjected to one-fire upsetting and drawing forging, and it is directly returned to the furnace after forging, and the recrystallization heat treatment is carried out at 70°C to 100°C above the β-transition temperature. Carry out 1 fire upsetting forging; 3) At 20°C to 50°C below the β transformation temperature, perform 1 to 2 fires of upsetting forging on the blank treated in step 2), air cooling after forging, and then at 30°C below the transformation temperature ~60°C, 2~3 times of drawing and forging to obtain a cylindrical blank of Φ380mm~Φ420mm; 4) Punch the cylindrical blank, elongate the mandrel, and expand the hole to obtain the tube blank; 5) The tube blank Roll forming and machining to obtain titanium alloy seamless pipes with an outer diameter of 600mm-680mm and a wall thickness of 10mm-20mm.

Description

technical field [0001] The invention relates to the technical field of titanium alloy material processing, in particular to a large-diameter titanium alloy seamless pipe and a preparation method thereof. Background technique [0002] The nominal composition of Ti75 alloy is Ti-3Al-2Mo-2Zr, which belongs to nearly α-type titanium alloy. It has excellent comprehensive properties, high specific strength, good erosion resistance, and seawater corrosion resistance. It can widely replace copper alloy pipes such as B10 and B30. , can reduce the weight by about 50%, greatly improve the performance of the ship, and at the same time greatly reduce the cost of use and maintenance, and have a wide range of application prospects. [0003] At present, the domestic Ti75 alloy large-diameter seamless pipe rolling process is not yet mature, and the production cost is high, which has brought certain restrictions on the wide application of this alloy pipe. With the rapid development of titani...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/06B21J5/00B21J5/10C22F1/18
CPCB21C37/06B21J5/002B21J5/10C22F1/183
Inventor 黄艳华樊凯余德坤吕亚平朱雪峰杨胜
Owner 湖南湘投金天钛业科技股份有限公司
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