Title:
METHOD FOR IMPROVING FLATTENING PERFORMANCE OF TITANIUM ALLOY SEAMLESS TUBE
Document Type and Number:
WIPO Patent Application WO/2024/087681
Kind Code:
A1
Abstract:
Provided in the present invention is a method for improving the flattening performance of a titanium alloy seamless tube. The method comprises the following steps: performing VAR smelting three times to obtain a titanium alloy ingot; preparing the titanium alloy ingot into a titanium alloy round bar; pressing the titanium alloy round bar into a hollow tube blank, and subjecting the interior of the hollow tube blank to wet sand blasting, external grinding and acid pickling to prepare a hollow tube blank; rolling the hollow tube blank into a finished titanium alloy seamless tube; sampling the finished titanium alloy seamless tube, and measuring the maximum depth h1 of a micro-pit in the inner surface and the maximum extension depth h2 of a micro-crack formed by the extension of the micro-pit; subjecting the inner surface of the finished titanium alloy seamless tube to wet sand blasting so as to remove a wall thickness of h1 + 0.02 mm, and subjecting the inner surface of the finished titanium alloy seamless tube to flow acid cleaning so as to remove a wall thickness of h2 + 0.02 mm; and subjecting the finished titanium alloy seamless tube in step 6 to vacuum annealing and straightening to obtain a finished tube. In the present invention, proper grain orientation is regulated by means of composition design and optimization, a thermal deformation process and a cold rolling process; and a better inner surface treatment method is used to completely eliminate micro-crack defects on the inner surface of the titanium alloy tube.
Inventors:
JIANG JIAN (CN)
Application Number:
PCT/CN2023/102287
Publication Date:
May 02, 2024
Filing Date:
June 26, 2023
Export Citation:
Assignee:
CHENGDU ADVANCED METAL MAT IND TECH RES INST CO LTD (CN)
International Classes:
B21C37/06
Foreign References:
| CN115647107A | 2023-01-31 | |||
| CN115647106A | 2023-01-31 | |||
| CN106493187A | 2017-03-15 | |||
| CN112725694A | 2021-04-30 | |||
| CN104149034A | 2014-11-19 | |||
| CN114101372A | 2022-03-01 | |||
| US20030196734A1 | 2003-10-23 |
Attorney, Agent or Firm:
DALIAN EAST PATENT AGENT LTD (CN)
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