Research on the Bonding Forming Mechanism of Carbon Steel/Stainless Steel Bimetallic Tubes with Three-roll Corrugated Skew Rolling

doi:10.3901/JME.260184

Abstract

Abstract: To address the technical bottlenecks of limited composite dimensions and insufficient interfacial bonding strength in traditional bimetallic tube preparation processes for manufacturing thin-walled small-diameter composite tubes，a three-roll corrugated skew rolling bonding process is proposed. Staggered corrugated rolls are set in the wall reduction section，and the “corrugated-flat rolling” method is adopted to prepare bimetallic tubes with spiral corrugated bonding interfaces. A numerical simulation model for three-roll corrugated skew rolling of carbon steel/stainless steel bimetallic tubes is established，and the metal flow behavior and interfacial evolution mechanism of staggered/equidistant corrugated rolling are systematically investigated. The results show that equivalent plastic strain values of 2.46 are achieved in the corrugated indentation regions through progressive pass-by-pass rolling in the staggered corrugated rolling process，and the surface strain of the outer tube is effectively transmitted to the interface through metal flow，promoting metallurgical bonding between dissimilar metals. Compared with equidistant corrugated rolling，more uniform interfacial plastic deformation and more significant corrugated forming effects are exhibited in the staggered rolling process. It is found that the tangential slip coefficient of bimetallic tubes is lower than theoretical values，and a prediction model for tangential slip coefficient considering the contact pressure between tube blank and mandrel is established. Carbon steel/stainless steel bimetallic tubes with excellent outer surface quality are prepared experimentally，with the bonding interface presenting a regular corrugation-like structure and corrugation period length of approximately 22 mm. A dual strengthening mechanism of metallurgical bonding and mechanical interlocking is achieved at the interface，providing a new technical approach for the industrial preparation of high-strength thin-walled small-diameter bimetallic tubes.

Key words: bimetallic tubes, three-roll corrugated skew rolling, staggered rolling, corrugated interface, metallurgical bonding, numerical simulation

CLC Number:

TG335

LI Zixuan, LI Hongji, XU Zhixiang, NIU Hui, JI Ce, WANG Tao. Research on the Bonding Forming Mechanism of Carbon Steel/Stainless Steel Bimetallic Tubes with Three-roll Corrugated Skew Rolling[J]. Journal of Mechanical Engineering, 2025, 62(6): 174-184.

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URL: http://www.cjmenet.com.cn/EN/10.3901/JME.260184

http://www.cjmenet.com.cn/EN/Y2025/V62/I6/174

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