PSI - Issue 22

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Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000

www.elsevier.com/locate/procedia

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Procedia Structural Integrity 22 (2019) 118–124 First International Symposium on Risk and Safety of Complex Structures and Components

© 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the First International Symposium on Risk and Safety of Complex Structures and Components organizers © 2019 The Authors. Published by Elsevier B.V.This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the First International Symposium on Risk and Safety of Complex Structures and Compo ents organize s Abstract Tensile and impact toughness test on X90 line pipe with different aging conditions were conducted to study the effect of aging c onditions on properties of X90 pipeline steel. The result shows that yield strength and yield ratio of X90 line pipe would increase significantly with the introduction of strain aging, while the impact toughness and tensile strength have little change. The impact toughness of X90 line pipe would decrease with the introduction of 200 ℃ , 5min aging. However, the impact toughness of X90 pipeline would increase with the increase of aging temperature and aging time (250 ℃ , 1h). The tensile strength of X90 pipeline steel would decrease or increase slightly after the introduction of aging. While the yield strength and yield ratio would increase significantly after the introduction of aging, and the rising range of yield strength and yield ratio would decrease with he increase of aging temperature and aging time. Comprehensive analysis shows that the aging treatment have different effects on different X90 pipeline steel, mainly due to different microstructure and chemical composition of X90 pipeline between manufacturers during the trial production. The result of aging sensitive coefficient analysis shows that the effect of microstructure type is more significant than that of chemical composition, and X90 pipeline steel with dual-phase microstructure would has high aging sensitivity coefficient. © 2019 The Authors. Published by Elsevier B.V.This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the First International Symposium on Risk and Safety of Complex Structures and Components organizers a State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, Xi'an 710077, China. b CNPC Tubular Goods Research Institute, Xi'an 710077, China. c Project Management Department of Eastern Oilfield of Petrochina Liaohe Oilfield Company ,Panjin 124010, China. Abstract Tensile and impact toughness test on X90 line pipe with different aging conditions were conducted to study the effect of aging c onditions on properties of X90 pipeline steel. The result shows that yield strength and yield ratio of X90 line pipe would increase significantly with the introduction of strain aging, while the impact toughness and tensile strength have little change. The impact toughness of X90 line pipe would decrease with the introduction of 200 ℃ , 5min aging. However, the impact toughness of X90 pipeline would increase with the increase of aging temperature and aging time (250 ℃ , 1h). The tensile strength of X90 pipeline steel would decrease or increase slightly after the introduction of aging. While the yield strength and yield ratio would increase significantly after the introduction of aging, and the rising range of yield strength and yield ratio would decrease with he increase of aging temperature and aging time. Comprehensive analysis shows that the aging treatment have different effects on different X90 pipeline steel, mainly due to different microstructure and chemical composition of X90 pipeline between manufacturers during the trial production. The result of aging sensitive coefficient analysis shows that the effect of microstructure type is more significant than that of chemical composition, and X90 pipeline steel with dual-phase microstructure would has high aging sensitivity coefficient. LI Yan-hua a,b, * , CHI Qiang a,b , BEN Yu-zhuang c , JI Ling-kang a,b , FENG Hui a,b , CHEN Hong-yuan a,b a State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, Xi'an 710077, China. b CNPC Tubular Goods Research Institute, Xi'an 710077, China. c Project Management Department of Eastern Oilfield of Petrochina Liaohe Oilfield Company ,Panjin 124010, China. Effect of Strain Aging on Properties of X90 Line Pipe First International Symposium on Risk and Safety of Complex Structures and Components LI Yan-hua a,b, * , CHI Qiang a,b , BEN Yu-zhuang c , JI Ling-kang a,b , FENG Hui a,b , CHEN Hong-yuan a,b Effect of Strain Aging on Properties of X90 Line Pipe

* Corresponding author. LI Yan-hua E-mail address: liyanhua003@cnpc.com.cn

2452-3216 © 2019 The Authors. Published by Elsevier B.V.This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review statement: Peer-review under responsibility of the First International Symposium on Risk and Safety of Complex Structures and Components organizers 2452-3216 © 2019 The Authors. Published by Elsevier B.V.This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review statement: Peer-review under responsibility of the First International Symposium on Risk and Safety of Complex Structures and Components organizers * Corresponding author. LI Ya -hua E-mail address: liyanhua003@cnpc.com.cn

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