Slow strain rate tests using smooth specimens of two types of steels, low alloy steel JIS-SCM435 and carbon steel JIS-SM490B, were carried out in nitrogen gas and hydrogen gas under a pressure of 115 MPa at three different temperatures: 233 K, room temperature and 393 K. In nitrogen gas, these steels exhibited the so-called cup-and-cone fracture at every temperature. On the other hand, in hydrogen gas, in both steels a number of cracks initiated on the specimen surface and coalesced with each other at every temperature, which led to a marked reduction in ductility. Nonetheless, even in hydrogen gas, JIS-SCM435 exhibited a certain reduction of area after the stress-displacement curve reached the tensile strength (TS), whereas JIS-SM490B exhibited little, if any, necking in hydrogen gas. In addition, tension-compression fatigue testing at room temperature revealed that in both steels there was no noticeable difference between the fatigue strengths in air and 115MPa hydrogen gas, especially in a relatively long life regime. Considering that there was little or no hydrogen-induced degradation in either TS or fatigue strength in JIS-SCM435, it is suggested that JIS-SCM435 is eligible for fatigue limit design on the basis of a safety factor (i.e. TS divided by the allowable design stress) for mechanical components used in hydrogen gas up to 115 MPa.
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ASME 2014 Pressure Vessels and Piping Conference
July 20–24, 2014
Anaheim, California, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
978-0-7918-4604-9
PROCEEDINGS PAPER
Tensile- and Fatigue-Properties of Low Alloy Steel JIS-SCM435 and Carbon Steel JIS-SM490B in 115 MPA Hydrogen Gas
Hisao Matsunaga,
Hisao Matsunaga
Kyushu University, Fukuoka, Japan
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Michio Yoshikawa,
Michio Yoshikawa
Kyushu University, Fukuoka, Japan
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Hisatake Itoga,
Hisatake Itoga
Kyushu University, Fukuoka, Japan
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Junichiro Yamabe,
Junichiro Yamabe
Kyushu University, Fukuoka, Japan
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Shigeru Hamada,
Shigeru Hamada
Kyushu University, Fukuoka, Japan
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Saburo Matsuoka
Saburo Matsuoka
Kyushu University, Fukuoka, Japan
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Hisao Matsunaga
Kyushu University, Fukuoka, Japan
Michio Yoshikawa
Kyushu University, Fukuoka, Japan
Hisatake Itoga
Kyushu University, Fukuoka, Japan
Junichiro Yamabe
Kyushu University, Fukuoka, Japan
Shigeru Hamada
Kyushu University, Fukuoka, Japan
Saburo Matsuoka
Kyushu University, Fukuoka, Japan
Paper No:
PVP2014-28511, V06BT06A015; 7 pages
Published Online:
November 18, 2014
Citation
Matsunaga, H, Yoshikawa, M, Itoga, H, Yamabe, J, Hamada, S, & Matsuoka, S. "Tensile- and Fatigue-Properties of Low Alloy Steel JIS-SCM435 and Carbon Steel JIS-SM490B in 115 MPA Hydrogen Gas." Proceedings of the ASME 2014 Pressure Vessels and Piping Conference. Volume 6B: Materials and Fabrication. Anaheim, California, USA. July 20–24, 2014. V06BT06A015. ASME. https://doi.org/10.1115/PVP2014-28511
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