METHOD FOR PREPARING MULTILAYER METAL COMPOSITE PIPE

WIPO Patent Application WO/2022/095271

A1

A method for preparing a multilayer metal composite pipe. The method comprises the following steps: internally and externally grinding blank pipes; cleaning oil stains; performing multi-layer metal pipe sleeving; drawing to reduce the diameter; performing pipe end and pipe surface high-speed friction welding; performing a heating treatment; performing four-roller cross rolling; performing a straightening treatment; performing two-roller cold rolling; performing cold drawing to reduce the diameter; performing cold expansion to reduce a wall and expand the diameter; performing precise cold rolling; performing a degreasing treatment; performing a brightening treatment; performing a surface grinding treatment; cleaning dust; detecting multilayer metal interface bonding; detecting flaws; testing the metal structure performance; and performing a sizing and packaging treatment. According to the method, products with a higher precision, a better performance and more prominent limit specifications can be obtained. The composite pipe prepared by the method has a high bonding capacity, and the bonding rate between multiple layers of dissimilar metals can be significantly improved.

CHU ZHIBING (CN)
XUE CHUN (CN)
ZHANG DUO (CN)
WEI DONG (CN)
YANG QIANHUA (CN)
LIU CUIRONG (CN)
LI YUGUI (CN)

PCT/CN2021/070205

May 12, 2022

January 05, 2021

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UNIV TAIYUAN SCIENCE & TECH (CN)

B21C1/22; B21B25/00; B21C3/06; B21C37/08; B21D3/02

CN109570260A	2019-04-05
CN1330988A	2002-01-16
CN105537316A	2016-05-04
EP2552613A1	2013-02-06
JPS6012294A	1985-01-22

TAIYUAN SHENLIDE INTELLECTUAL PROPERTY AGENCY(SPECIAL ORDINARY PARTNERSHIP) (CN)

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