A preparation method of low-cost high-strength and tough titanium alloy pipe for marine engineering

A tough titanium alloy and marine engineering technology, which is applied in the field of preparation of low-cost, high-strength and tough titanium alloy pipes for marine engineering, can solve the problems of long process flow of high-strength titanium alloy pipes, long pipe procedures and no production system, and achieves a reduction in Processing cost, reduction of multiple deformation processes, and fine grain size

Active Publication Date: 2022-03-15
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method of a β-titanium alloy pipe disclosed in the publication number CN103436735A is also suitable for the preparation of high-strength titanium alloy pipes, but the pipes prepared by this process have a long process flow and low production efficiency, and the obtained alloy pipes are mainly thin-walled pipes
[0007] At present, the high-strength titanium alloy pipes produced by my country's titanium enterprises have a long process and high cost, and high-strength thick-walled titanium alloy pipes have not formed a reliable production system.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] This embodiment includes the following steps:

[0045] Step 1. Perform conventional forging and precision forging deformation on the ingot of titanium alloy in turn to obtain a billet; the titanium alloy is composed of the following mass percentages: Al 5.06%, Sn 2.5%, Zr4.02%, Mo 1%, V 0.5%, Nb 1.36%, the balance is Ti and unavoidable impurities;

[0046] The process of the conventional forging is: heating the ingot of the titanium alloy to 50° C. above the β transformation point temperature and performing conventional forging to obtain a conventionally forged titanium alloy ingot with a diameter of 110 mm, wherein the forging ratio is 11.4; the process of precision forging deformation is as follows: heat the ingot of titanium alloy after conventional forging to 15°C below the temperature of the β transformation point, and then carry out precision forging deformation to obtain a billet with a diameter of 80 mm, wherein the deformation amount 44%;

[0047] Step 2. Cro...

Embodiment 2

[0057] This embodiment includes the following steps:

[0058] Step 1. Perform conventional forging and precision forging deformation on the ingot of titanium alloy sequentially to obtain a billet; the titanium alloy is composed of the following mass percentages: Al 5.98, Sn 1.06, Zr 4.56, Mo 1.73, V 1.25 , Nb1.03, the balance is Ti and unavoidable impurities;

[0059] The conventional forging process is as follows: heating the ingot of titanium alloy to 80° C. above the β transformation point temperature and performing conventional forging to obtain a conventionally forged titanium alloy ingot with a diameter of 110 mm, wherein the forging ratio is 11.4; the process of precision forging deformation is: heating the ingot of titanium alloy after conventional forging to 20°C below the temperature of the β transformation point, and then performing precision forging deformation to obtain a billet with a diameter of 80 mm, wherein the deformation amount 44%;

[0060] Step 2. Cross...

Embodiment 3

[0070] This embodiment includes the following steps:

[0071] Step 1. Perform conventional forging and precision forging deformation on the ingot of titanium alloy sequentially to obtain a billet; the titanium alloy is composed of the following mass percentages: Al 6.5, Sn 0.5, Zr 5.28, Mo 1.96, V 1.5 , Nb 0.5, the balance is Ti and unavoidable impurities;

[0072] The conventional forging process is as follows: heating the ingot of titanium alloy to 70° C. above the β transformation point temperature and performing conventional forging to obtain a conventionally forged titanium alloy ingot with a diameter of 110 mm, wherein the forging ratio is 11.4; the process of precision forging deformation is: heat the ingot of titanium alloy after conventional forging to 25°C below the temperature of the β transformation point, and then carry out precision forging deformation to obtain a billet with a diameter of 80mm, wherein the deformation amount 44%;

[0073] Step 2. Cross-rolling...

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Abstract

The invention discloses a method for preparing a low-cost, high-strength and tough titanium alloy pipe for marine engineering. The method comprises the following steps: first, performing conventional forging and precision forging deformation on an ingot of titanium alloy to obtain a bar blank; The billet is cross-rolled and pierced, and then subjected to surface defect trimming, pickling and annealing to obtain a perforated tube blank; 3. Cold-rolling the perforated tube blank to obtain a cold-rolled tube blank; Pickling, heat treatment and straightening to obtain titanium alloy pipes. In the invention, the titanium alloy ingot is prepared into a bar billet by conventional forging and precision forging, and then a tube billet is obtained by skew rolling, piercing and cold rolling, and finally heat treatment is performed to obtain a titanium alloy pipe, which shortens the technological process and reduces the processing time. Compared with traditional titanium alloy pipes, the cost and cost are greatly reduced, and at the same time, it provides a guarantee for the microstructure and properties of the pipes after forming. The prepared titanium alloy pipes not only meet the conditions of offshore operation, but also meet the environmental requirements of oil and gas development and service.

Description

technical field [0001] The invention belongs to the technical field of titanium alloys, and in particular relates to a preparation method of low-cost high-strength and tough titanium alloy pipes for ocean engineering. Background technique [0002] Titanium and its alloys have high specific strength and excellent corrosion resistance, especially the immunity to marine atmospheric environment erosion is very good, and they are the most ideal materials for deep-sea oil and gas development equipment. TC4, Ti-75, Ti-B19, Ti-80, and TA5 are currently widely used titanium alloy structural parts materials in the sea. Among them, Ti-Al-Zr-Mo alloys (Ti-75, Ti-80) have excellent comprehensive properties such as strength, ductility, corrosion resistance, and processing performance. , high chlorine and high carbon dioxide offshore oil and gas fields have been put into production one after another, and traditional titanium alloys can meet the needs of deep development of oil and gas fie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B3/00B21B45/02B21B45/04B21B37/56B21B37/46B21B19/04B21J1/06B21J5/00C22C14/00C21D9/08C22F1/18
CPCB21B3/00B21B45/0239B21B45/0269B21B45/04B21B37/56B21B37/46B21B19/04B21J1/06B21J5/002C22C14/00C21D9/08C22F1/183B21B2265/10
Inventor 李思兰侯智敏毛成亮贾蔚菊
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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