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Microcrystalline and high corrosion resistance type titanium alloy pipe and preparation method thereof

A technology for titanium alloys and pipes, which is applied in the field of microcrystalline, high-strength, corrosion-resistant titanium alloy pipes and their preparation, which can solve problems such as low strength, complicated preparation methods, and coarse structures, and achieve good quality, high structure density, and crystal grains. small size effect

Inactive Publication Date: 2018-10-02
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problems of the existing titanium alloy pipes with coarse structure, low strength and complicated preparation methods, the present invention provides a microcrystalline high-strength corrosion-resistant titanium alloy pipe and its preparation method. The method prepares microcrystalline high-strength and corrosion-resistant titanium alloy pipes. The obtained pipes have small grain size, high structure density, excellent strength and plastic properties, and the process is simple and easy to realize industrial production.

Method used

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  • Microcrystalline and high corrosion resistance type titanium alloy pipe and preparation method thereof
  • Microcrystalline and high corrosion resistance type titanium alloy pipe and preparation method thereof
  • Microcrystalline and high corrosion resistance type titanium alloy pipe and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Forged tube billet: using sponge titanium Ti80 (brand Ti-6Al-3Nb-2Zr-1Mo) as raw material, the measured ratio of alloying elements is Al: 6.1%, Nb: 2.5%, Zr: 2.0%, Mo : 1.1%, Fe: 0.03%, Si: 0.02%, and the balance is Ti. It is smelted in a vacuum consumable furnace and smelted three times to achieve uniform composition. After 5 to 8 times of drawing-compression forging to form a blank, then peel off the skin to remove the 0.5-1mm surface layer to obtain a Ф92mm round tube blank, that is, the tube blank; the measurement found that the volume percentage of the β phase in the tube blank is less than 7%, which is close to α Titanium alloy;

[0029] (2) Preparation of capillary tube: send the tube billet into the annular heating furnace, heat it with the furnace to 995 ° C for 70 minutes, and then roll it through cross-rolling and piercing, and cool it by external spraying and internal spraying to make the capillary tube; it is found that the capillary tube The microstr...

Embodiment 2

[0035] (1) Forged tube billet: Ti80 (brand Ti-6Al-3Nb-2Zr-1Mo) is used as the sponge titanium raw material, and the ratio of alloy elements measured is Al: 6.0%, Nb: 2.4%, Zr: 1.9%, Mo : 0.9%, Fe: 0.04%, Si: 0.02%, and the rest is Ti. It is smelted in a vacuum consumable furnace and smelted three times to achieve uniform composition. After 5 to 8 times of drawing-compression forging to form a blank, then peel off the skin to remove the 0.5-1mm surface layer to obtain a Ф115mm round tube blank, that is, the tube blank; the measurement found that the volume percentage of the β phase in the tube blank is less than 7%, which is close to α Titanium alloy;

[0036] (2) Preparation of capillary tube: send the tube billet into the annular heating furnace, heat it to 1015°C and keep it for 70 minutes, then roll it through cross-rolling and piercing, and cool it by external spraying and internal spraying to make capillary tube; the measurement found that the microstructure of the capil...

Embodiment 3

[0042] (1) Forged tube billet: Ti80 (brand Ti-6Al-3Nb-2Zr-1Mo) is used as the sponge titanium raw material, and the measured chemical composition content (wt.%) of alloy elements is: Al: 6.0%, Nb: 2.8%, Zr : 2.0%, Mo: 1.1%, Fe: 0.03%, Si: 0.02%, and the rest is Ti. It is smelted in a vacuum consumable furnace and smelted three times to achieve the purpose of uniform composition. After 5 to 8 times of drawing-compression forging to form a blank, and then peel off the skin to remove the 0.5-1mm surface layer, the Ф96mm round tube billet is obtained, that is, the tube blank; the measurement found that the volume percentage of the β phase in the tube blank is less than 7%, which is close to α Titanium alloy;

[0043] (2) Preparation of capillary tube: send the tube billet into the annular heating furnace, heat it to 1030°C and keep it for 70 minutes, then roll it through cross-rolling and piercing, and cool it by external spraying and internal spraying to make the capillary tube; ...

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Abstract

The invention discloses a microcrystalline and high corrosion resistance type titanium alloy pipe and a preparation method thereof, and belongs to the technical field of titanium alloy pipes. According to the technical scheme, the preparation method is characterized by comprising the steps of preparing titanium sponge as a raw material; controlling the following chemical components in percentage by mass: 5.0-7.0% of Al, 2.0-3.0% of Nb, 0.5-2.0% of Zr, 0.7-1.2% of Mo, 0.02-0.05% of Fe, 0.01-0.03% of Si, and the balance Ti; smelting and forging to obtain a pipe blank; maintaining the temperatureof 990-1040 DEG C for 60-120min; performing cross piercing rolling; cooling; maintaining the temperature of 700-900 DEG C for 20-40min; rolling to obtain a pre-fabricated pipe; annealing for 30min to2h under the temperature of 350-550 DEG C; and cooling to obtain the pipe. The pipe structure contains an alpha phase and a beta phase; the grain size of the alpha phase is 0.5-1 micron; the grain size of the beta phase is 0.1-0.3 microns; and the intensity, the toughness and the corrosion resistance are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy pipes, and in particular relates to a microcrystalline high-strength corrosion-resistant titanium alloy pipe and a preparation method thereof. Background technique [0002] Titanium alloy has high yield strength, low density, and high specific strength. The quality of pipes of the same specification is only about 60% of that of nickel-based alloy pipes. Further, through plastic deformation and heat treatment, high strength and high strength can be obtained. Comprehensive mechanical properties of good plasticity and toughness. Titanium alloy pipes also have good corrosion resistance, H 2 S, CO 2 , HCl corrosion performance is better than that of nickel-based alloys, and it has a broader application prospect in fields such as oil well pipes. At present, the preparation methods of titanium alloy pipes mainly include hot extrusion and cross-rolling perforation, etc. The Chinese invention pat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22F1/18C21D9/08B21J5/00B21C37/06
CPCB21C37/06B21J5/002C21D9/08C22C14/00C22F1/183
Inventor 王青峰郭凯孟康缪顿姚川孙宇王天生
Owner YANSHAN UNIV
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