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Method for producing high-strength titanium alloy seamless tube

A titanium alloy and seamless tube technology, applied in the field of metallurgy, can solve the problems of complex cold-rolled titanium tube process, low yield of hot-rolled titanium tube, and poor internal and external surface quality, so as to save the heat treatment process and have fewer internal and external surface defects , the effect of good mechanical properties

Active Publication Date: 2015-01-07
PANGANG GROUP CHENGDU STEEL & VANADIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can produce qualified products, but its process is complicated, the cost is high, and vacuum annealing is needed to achieve the performance required by the product
[0006] It can be seen that the existing hot-rolled titanium pipes have a low yield, and because of the existence of air-permeable layers on the inner and outer surfaces, the inner and outer surfaces have poor quality and many defects, especially inner surface defects, which are difficult to remove
The process of cold-rolling titanium tube is complicated, the cost is high, the output is low, and vacuum annealing is required to achieve the required performance

Method used

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  • Method for producing high-strength titanium alloy seamless tube
  • Method for producing high-strength titanium alloy seamless tube
  • Method for producing high-strength titanium alloy seamless tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The production process of 88.9*6.45 TC4 titanium alloy pipe is as follows: forging machine processing φ95 round billet → drilling centering hole → heating in inclined bottom furnace → piercing into 98*7.5 capillary pipe → sizing to 89*7.5 smooth pipe → tape Warm straightening → warm fine drawing to 88.9*6.45 → warm straightening → pickling → finished product.

[0040] The φ95 round billet is heated in an inclined-bottom furnace at 920°C for 2 hours. At this time, the thickness of the air-permeable layer of the round billet is less than 0.25 mm. The capillary temperature after piercing is 1040°C, the temperature before sizing is 810°C~830°C, the temperature after sizing is 770°C~800°C, after fine drawing at 800°C~830°C, it is straightened at 580°C~600°C, pickled Using 8% hydrofluoric acid + 19% nitric acid + water.

[0041] The outer diameter of the TC4 titanium alloy tube in Example 1 is shown in Table 1.

[0042] The outer diameter size (mm) of the TC4 titanium alloy...

Embodiment 2

[0052] Production of 73*5.51 TC4 titanium alloy tubes, process flow: forging machine processing φ85 round billet → drilling centering hole → heating in inclined bottom furnace → piercing into 87*6.5 capillary tube → sizing to 73*6.5 bare tube → temperature Straightening → fine drawing with temperature to 73*5.51 → straightening with temperature → pickling → finished product.

[0053] The φ85 round billet is heated in an inclined-bottom furnace at 910°C for 100 minutes. At this time, the thickness of the air-permeable layer of the round billet is less than 0.25 mm. The capillary temperature after piercing is 1050°C, the temperature before sizing is 815°C~835°C, the temperature after sizing is 775°C~805°C, after fine drawing at 800°C~830°C, it is straightened at 580°C~600°C, pickled Using 7% hydrofluoric acid + 18% nitric acid + water.

[0054] The outer diameter tolerance of the TC4 titanium alloy tube produced in Example 2 is in the range of 0-+1%, and the wall thickness tole...

Embodiment 3

[0058] Production of 114*6.88 TC4 titanium alloy tubes, process flow: forging machine processing φ115 round billet → drilling centering hole → heating in inclined bottom furnace → piercing into 118*8 capillary tube → sizing to 114*8 bare tube → temperature Straightening → fine drawing with temperature to 114*6.88 → straightening with temperature → pickling → finished product.

[0059] The φ115 round billet is heated in an inclined-bottom furnace at 940°C for 4 hours. At this time, the thickness of the air-permeable layer of the round billet is less than 0.25mm. The capillary temperature after piercing is 1055°C, the temperature before sizing is 820°C~840°C, the temperature after sizing is 780°C~810°C, after fine drawing at 800°C~830°C, it is straightened at 580°C~600°C, pickled Using 8.5% hydrofluoric acid + 20% nitric acid + water.

[0060] The outer diameter tolerance of the TC4 titanium alloy tube produced in Example 3 is in the range of 0-+1%, and the wall thickness toler...

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Abstract

The invention relates to and aims at providing a method for producing a high-strength titanium alloy seamless tube and belongs to the field of metallurgy. The method for producing the high-strength titanium alloy seamless tube sequentially comprises the following steps: heating a round billet, perforating, sizing, carrying out hydraulic drawing and temperature correcting, and the like, thereby obtaining the titanium alloy seamless tube finally. The method for producing the high-strength titanium alloy seamless tube has the advantages that deformation at the medium temperature of 750-850 DEG C is increased to directly obtain the titanium alloy tube meeting performance requirements, a heat treatment process is eliminated, and the aims of simplifying working procedures, optimizing a technology, reducing cost, shortening a production cycle, improving production efficiency and improving product quality are achieved. The titanium alloy tube produced by the method has the advantages of thin gas permeable layer, high outer diameter and wall thickness dimensional accuracy, few inner and outer surface defects, high yield and the like. The method provides a new choice for production of the titanium alloy tube and has broad application prospects.

Description

technical field [0001] The invention relates to a method for producing a high-strength titanium alloy seamless pipe, belonging to the field of metallurgy. Background technique [0002] With the rapid development of my country's national economy and science and technology, the preparation technology and product quality of titanium alloy materials have been greatly improved, which has led to the rapid expansion of the application field of titanium alloys. In recent years, the demand for high-strength titanium alloy pipes has increased. [0003] Existing titanium alloy seamless pipes are generally produced by hot rolling or cold rolling. [0004] Patent 103128102A discloses a production method of titanium alloy oil well pipe. The production method includes: two smelting in a vacuum furnace, multiple times of forging and stripping to form a round billet, heating to 970-1030°C in a ring furnace, thermal perforation to obtain a capillary tube, and capillary tube through After des...

Claims

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Application Information

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IPC IPC(8): B21C37/30C22C14/00
CPCB21C37/30C22C14/00
Inventor 成海涛边华川江健郭元蓉薛永财邹友富彭海龙杨旭曾理黄英张凯之冯庆
Owner PANGANG GROUP CHENGDU STEEL & VANADIUM
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