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Titanium or titanium alloy seamless square tube and preparation method thereof

A technology of titanium alloy and square rectangular tube, which is applied in metal rolling, metal rolling, metal processing equipment, etc., can solve the problems of complex preparation, low pipe yield, long production cycle, etc., and achieve simple and easy preparation method, The effect of high dimensional accuracy and continuous production

Active Publication Date: 2021-03-16
WESTERN METAL MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the method of plate bending + welding can produce titanium alloy square tubes, the service life of the tubes is greatly reduced due to the existence of welds.
The problem of the titanium alloy square tube by die drawing method is that the deformation resistance of titanium alloy is large, and it is difficult to form through drawing with a large amount of deformation. Usually, multi-pass drawing is required, the production cycle is long, and the drawing The process requires heating, which leads to easy bonding between the titanium alloy and the mold, and the low yield of the pipe
Chinese patent CN105903766 B discloses the direct preparation of titanium alloy square tubes by hot rolling, but the dimensional accuracy of the square tubes is poor; The forming of the square tube, the heating before the round tube is transformed into a square tube causes serious oxidation of the inner and outer surfaces of the titanium alloy. When polishing is used subsequently, the square polishing head cannot rotate inside the square tube, and the round polishing head cannot rotate the inside of the square tube. The oxide skin on the surface is completely removed, and there is also the problem of complicated preparation

Method used

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  • Titanium or titanium alloy seamless square tube and preparation method thereof
  • Titanium or titanium alloy seamless square tube and preparation method thereof
  • Titanium or titanium alloy seamless square tube and preparation method thereof

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preparation example Construction

[0027] The invention provides a method for preparing a titanium or titanium alloy seamless square tube, comprising the following steps;

[0028] Provide a circular tube blank, the circular tube blank is a round titanium tube blank or a round titanium alloy tube blank;

[0029] Carrying out first annealing, one-pass cold rolling, second annealing, straightening and machining treatment of scale on the inner and outer surfaces of the circular tube blank in sequence to obtain a semi-finished round tube;

[0030] Carrying out multi-pass cold rolling to the semi-finished round pipe to obtain a seamless round pipe with the same perimeter and wall thickness as the square rectangular pipe;

[0031] Carrying out the third annealing to the seamless tube to obtain the annealed seamless tube;

[0032] The annealed seamless round tube is formed and straightened by using a square tube forming equipment to gradually change from a circle to a square to obtain a square tube;

[0033] The four...

Embodiment 1

[0056] TA18 titanium alloy seamless square tube (60×3mm, R=3mm) was prepared.

[0057] image 3 The physical figure of the TA18 titanium alloy seamless square tube provided for Example 1 of the present invention;

[0058] Heat the Φ122mm bar to T β +20°C, heat preservation for 100-220min, cross-rolling and piercing to prepare TA18 tube blank of Φ128×11mm. The tube blank is vacuum annealed at 750°C for 1h (vacuum degree 1×10 -1 After Pa), cold rolling is carried out one time, Φ128×11mm→Φ108×9mm. The Φ108×9mm semi-finished pipe is vacuum annealed and straightened at 700°C / 3h, then internally bored and externally scraped to remove the scale on the inner and outer surfaces to obtain a Φ107×8mm semi-finished pipe. After the surface treatment, the semi-finished pipe is rolled twice (Φ107×8mm→Φ94×5mm→Φ74.8×3mm) to obtain a seamless titanium alloy round pipe of Φ74.8×3mm. The semi-finished pipe after each pass of rolling needs to be vacuum annealed at 700°C for 3 hours (vacuum de...

Embodiment 2

[0060] Low-cost high-strength Ti-3.5Al-2.5Mo-1.5Cr-1.5Fe titanium alloy seamless rectangular tube (100×80×4mm, R=6mm) was prepared.

[0061] Heat the Φ165mm bar to T β +80°C, heat preservation for 132-310min, cross-rolling and piercing to prepare a tube blank of Φ170×13.5mm. After the tube billet is annealed at 850°C for 3 hours, it is air-cooled, and then cold-rolled once, Φ170×13.5mm→Φ138×11.5mm. Anneal Φ138×11.5mm semi-finished pipes at 850°C for 3 hours (vacuum degree 1×10 -2 Pa), straightening, and then internally boring and externally removing scales on the inner and outer surfaces to obtain semi-finished pipes of Φ137×10.5mm. The Φ137×10.5mm semi-finished pipe is rolled in two passes (Φ137×10.5mm→Φ120×6.5mm→Φ100.6×4mm) to obtain a Φ100.6×4mm seamless titanium alloy round pipe. The semi-finished pipe after each pass of rolling needs to be vacuum annealed at 800 °C for 3 hours (vacuum degree 1×10 -2 Pa). The finished seamless titanium alloy round tube obtained by the...

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Abstract

The invention provides a titanium or titanium alloy seamless square tube and a preparation method thereof, and belongs to the field of titanium alloy tube preparation. The method includes the steps: providing a circular tube blank; sequentially carrying out first annealing, first-pass cold rolling, second annealing, straightening and machining treatment of inner and outer surface oxide skin on theround tube blank to obtain a semi-finished round tube; carrying out multi-pass cold rolling on the semi-finished round tube to obtain a seamless round tube with the same perimeter and wall thicknessas a square tube; carrying out third annealing on the seamless round tube to obtain an annealed seamless round tube; forming and straightening the annealed seamless round tube by adopting square tubeforming equipment from round to square gradually to obtain the square tube; and sequentially carrying out fourth annealing and straightening on the square tube to obtain the titanium or titanium alloyseamless square tube. The preparation method is simple and easy to implement, short in construction period and low in cost, no mold is needed, and the titanium or titanium alloy seamless square tubewithout welding seams and high size precision can be obtained.

Description

technical field [0001] The invention relates to the technical field of titanium alloy pipe preparation, in particular to a titanium or titanium alloy seamless rectangular pipe and a preparation method thereof. Background technique [0002] Compared with round pipes with the same cross-sectional area, square rectangular pipes have the advantages of light weight, high strength, large flexural section modulus, metal saving, and easy installation. In order to achieve the purpose of weight reduction, aircraft, military vehicles, tanks, automobiles, etc. have an urgent demand for titanium and titanium alloy square tubes. At present, the methods for producing titanium and titanium alloy seamless square tubes include: plate bending + welding, die drawing method, hot rolling, heating + round tube into square tube, etc. Although the method of plate bending + welding can produce titanium alloy square tubes, the service life of the tubes is greatly reduced due to the existence of welds...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/56B21B37/74B21B15/00B21B45/02B21B3/00C21D9/08C22F1/18C22F1/02
CPCB21B37/56B21B37/74B21B15/00B21B45/0269B21B3/00C21D9/08C22F1/183C22F1/02B21B2015/0071B21B2265/10
Inventor 席锦会葛鹏侯鹏刘姣王彦皓
Owner WESTERN METAL MATERIAL
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