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  Analysis and estimation of the yield strength of API X70 and X80 linepipe steels by double-cycle simulation tests

Sohn, S. S., Han, S. Y., Shin, S. Y., Bae, J., & Lee, S. (2013). Analysis and estimation of the yield strength of API X70 and X80 linepipe steels by double-cycle simulation tests. Metals and Materials International, 19(3), 377-388. doi:10.1007/s12540-013-3002-1.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-D807-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-D808-3
Genre: Journal Article

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 Creators:
Sohn, Seok Su1, Author              
Han, Seung Youb2, Author              
Shin, Sang Yong3, Author              
Bae, Jinho4, Author              
Lee, Sunghak5, Author              
Affiliations:
1Pohang University of Science and Technology, Pohang, South Korea, persistent22              
2Center for Advanced Aerospace Materials, Pohang University of Science and Technology, Pohang 790-784, South Korea, persistent22              
3Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863381              
4Sheet Products and Process Research Group, Technical Research Laboratories, POSCO, Pohang 790-785, South Korea, persistent22              
5Center for Advanced Aerospace MaterialsPohang, University of Science and Technology, Pohang, South Korea, persistent22              

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 Abstract: In this study, the spiral piping and electric resistance welding piping was conducted on API X70 and X80 linepipe steel sheets having different microstructures, and the yield strengths of the flattened sheets were measured. A double-cycle simulation test with tension-compression-tension or compression-tension-tension for the piping and flattening processes was conducted to estimate the yield strength. The simulation test results indicated that the yield strengths of the outer or inner wall of the pipe could be estimated by combination of Swift's equation and the Bauschinger stress parameter, and that these estimated yield strengths were well matched within a small error range with the measured yield strengths. Thus, the variations in yield strength before and after the piping could be effectively estimated using the tension/compression properties of the leveled sheets because the strength differential effect was small and the reverse flow curves were expressed by a single curve. These findings suggested that the present estimation method played an important role in controlling microstructural and manufacturing process parameters to minimize the reduction in yield strength of the linepipe steel sheets. © 2013 The Korean Institute of Metals and Materials and Springer Science+Business Media Dordrecht.

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Language(s): eng - English
 Dates: 2013-05
 Publication Status: Published in print
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1007/s12540-013-3002-1
BibTex Citekey: Sohn2013377
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Title: Metals and Materials International
Source Genre: Journal
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Pages: - Volume / Issue: 19 (3) Sequence Number: - Start / End Page: 377 - 388 Identifier: ISSN: 15989623
CoNE: /journals/resource/15989623