Manufacturing method of thick-walled titanium tube

A manufacturing method and technology of titanium tubes, applied in the field of tube manufacturing, can solve problems such as no production experience in tubes, achieve low manufacturing costs, excellent performance, and save production costs

Active Publication Date: 2011-11-16
WESTERN TITANIUM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there are no relevant reports and production experience on this type of pipe at home and abroad.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) The ingot is prepared by melting twice in a vacuum consumable electric arc furnace. The mass percentage content of each element in the ingot is: C 0.08%, N 0.05%, H 0.015%, Fe 0.30%, O 0.25%, and the balance for Ti;

[0025] (2) the ingot described in the step (1) is forged three times under the condition of 800° C. to obtain a round bar, and the amount of deformation per time is 30%; then the round bar is machined to obtain a uniform structure, Rods with uniform composition; then the rods are extruded into tube blanks under the condition that the extrusion ratio is 20; then the tube blanks are pickled with nitric acid with a mass percentage concentration of 60% to remove the copper skin on the tube blanks;

[0026] (3) adopt cold rolling mill to carry out rolling twice to the billet tube after pickling in step (2), every time after rolling, carry out degreasing treatment and recrystallization annealing treatment successively to the billet tube after rolling, contro...

Embodiment 2

[0031] The processing method of this embodiment is the same as that of Embodiment 1, except that the annealing treatment system is: annealing treatment at a temperature of 750° C. for 90 minutes and then air cooling.

[0032] The Gr.3 thick-walled titanium tube processed in this example has undergone performance tests such as appearance quality inspection, size inspection, room temperature stretching, flaring, flattening, and ultrasonic flaw detection. The performance of the finished tube in the recrystallized annealed state is: tensile strength ≥500MPa, yield strength 380MPa~550MPa, elongation ≥20%, meet the requirements of ASTMB 338 standards, and can meet the needs of industrial pipes such as pressure vessels, condensers and heat exchangers.

Embodiment 3

[0034] (1) The ingot is prepared by melting twice in a vacuum consumable electric arc furnace. The mass percentage content of each element in the ingot is: C 0.06%, N 0.04%, H 0.01%, Fe 0.025%, O 0.20%, and the balance for Ti;

[0035] (2) Forging the ingot described in step (1) at a temperature of 1000°C for three times to obtain a round bar, the deformation of each time is 70%; then the round bar is machined to obtain the structure and composition Uniform rods; then the rods are extruded into tube blanks under the condition that the extrusion ratio is 24; then the tube blanks are pickled with nitric acid with a mass percentage concentration of 60% to remove the copper skin on the tube blanks;

[0036] (3) Adopt the cold rolling mill to carry out rolling three times to the tube blank after pickling in the step (2), every time after rolling, carry out degreasing treatment and recrystallization annealing treatment to the tube blank after rolling successively, control every The r...

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Abstract

The invention discloses a manufacturing method of a thick-walled titanium tube. The method comprises the following steps: firstly preparing a cast ingot; forging the cast ingot, processing, then extruding to form a tube blank, and further performing acid cleaning; rolling the tube blank after acid cleaning, and sequentially performing deoiling treatment and recrystallization annealing treatment on the rolled tube blank after rolling every time; after rolling, further rolling the rolled tube blank again to obtain a finished tube product; and finally performing annealing treatment on the finished tube product, and performing acid cleaning to remove oxide skins on the inner surface and the outer surface so as to obtain the Gr.3 thick-walled titanium tube. The Gr.3 thick-walled titanium tube manufactured by adopting the method is excellent in performance, the tensile strength is not less than 500MPa, the yield strength is 380-550MPa, the elongation rate is not less than 20%, the ratio of the outer diameter of the tube to the wall thickness is 5-10, and the inner surface and the outer surface are better in quality and can meet the requirements of ASTM (American society for testing and materials) B 338, thereby meeting the requirements of tubes for industrial fields such as pressure vessels, condensers, heat exchangers and the like.

Description

technical field [0001] The invention belongs to the technical field of pipe material manufacturing, and in particular relates to a method for manufacturing a Gr.3 thick-walled titanium pipe. Background technique [0002] Pressure vessels commonly used in petroleum, chemical and other industries need to be used in special environments such as high temperature, high pressure and corrosive media, so the pipes used in this field must have high strength, thickness and good corrosion resistance. Gr.3 pure titanium has excellent room temperature, high temperature mechanical properties, thermal conductivity and corrosion resistance, so thick-walled pipes of this material are widely used in the field of pressure vessels. [0003] The cold-rolled forming of thick-walled tubes has always been a technical problem, especially for thick-walled tubes with a diameter-to-thickness ratio (the ratio of the outer diameter of the tube to the wall thickness) ≤ 10, which is prone to defects such a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00B21C37/06B21B37/58
Inventor 杨亚社杨永福南莉韦培董宏军文周峰李刚齐元昊罗登超王莎叶红川杨建朝翟孝
Owner WESTERN TITANIUM TECH
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