Effect of low partial hydrogen in a mixture with methane on the mechanical properties of X70 pipeline steel |
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| Affiliation: | 1. Center for Energy Materials Measurement, Division of Industrial Metrology, Korea Research Institute of Standard and Science (KRISS), 267 Gajeong-Ro, Yuseoung-Gu, Daejeon 34113, Republic of Korea;2. Korea Gas Corporation, Gyeonggi-do, 163-754, Republic of Korea;1. State University of Ponta Grossa, UEPG, Ponta Grossa, PR, Brazil;2. Brazilian Nanotechnology National Laboratory, LNNano, Brazilian Center for Research in Energy and Materials, Campinas, SP, Brazil;3. Center for Engineering, Modeling and Applied Social Sciences (CECS), Universidade Federal do ABC (UFABC), Santo André, SP, Brazil;4. State University of Campinas, UNICAMP, Campinas, SP, Brazil;5. Metallurgical and Materials Engineering, University of São Paulo, USP, São Paulo, SP, Brazil;6. Petrobras, CENPES, Rio de Janeiro, RJ, Brazil;7. UNESP – São Paulo State University, São João da Boa Vista, SP, Brazil;1. National Technical University of Athens, Shipbuilding Technology Laboratory, 9 Iroon Polytechniou str, P.C. 15780, Zografou, Greece;2. Engitec Systems International Ltd., 143 Spyrou Kyprianou Avenue Chrysanthou Business Centre, Limassol, P.C. 3083, Cyprus;3. Research and Development Center, Saudi Aramco, PO Box 62, Dhahran, 31311, Saudi Arabia;4. Masdar Institute of Science and Technology, PO Box 54224, Abu Dhabi, A Part of Khalifa University of Science and Technology, United Arab Emirates;5. N.C.S.R. ''Demokritos'' – Institute of Physical Chemistry, 15310, Athens, Greece;1. University of Illinois at Urbana-Champaign, Department of Mechanical Science and Engineering, 1206 West Green Street, Urbana, IL 61801, USA;2. International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka, Fukuoka, 819-0395, Japan;3. Seattle University, Department of Mechanical Engineering, 901 12th Street, Seattle, WA 98122, USA;4. National Fuel Cell Research Center, University of California, Irvine, Irvine, CA, 92697, USA;5. Southern California Gas Company, Material and Equipment Division, Los Angeles, CA 90013, USA;1. Institute of Process Equipment, Zhejiang University, Hangzhou, Zhejiang 310027, PR China;2. CNPC Tubular Goods Research Institute, Xi''an, Shaanxi 710077, PR China;1. School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China;2. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin, 300072, China;3. State Key Laboratory of Engines, Tianjin University, Tianjin, 300050, PR China |
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| Abstract: | In this study, the effect of a low partial hydrogen in a mixture with natural gas on the tensile, notched tensile properties, and fracture toughness of pipeline steel X70 is investigated. An artificial HE aging is simulated by exposing the tested sample to the mixture gas condition for 720 h. In addition, a series of tests is conducted in ambient air and 10 MPa of 100% He and H2. Overall, 10 MPa of 100% H2 significantly degrades the mechanical properties of an X70 pipeline steel. However, it is observed that the 10 MPa gas mixture with 1% H2 does not affect the mechanical properties when tested with a smooth tensile specimen. In the notched tensile test, a significant reduction in loss in the area is observed when tested with a notched specimen with a notch radius of 0.083 mm. It is also confirmed that a 10-MPa gas mixture with 1% H2 causes a remarkable reduction in the toughness. The influence of the exposure time to 1% hydrogen in a mixture with natural gas was found to be minor. |
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| Keywords: | X70 pipeline steel Hydrogen embrittlement Notched-tensile Toughness Mixture gas |
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