A case study of a cooling pipe for a pre-cooler used in a 70-MPa hydrogen station

Saburo Okazaki, Shigeru Hamada, Hisatake Itoga, Hisao Matsunaga, Masami Nakamura, Saburo Matsuoka

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

抄録

A case study was conducted on the cooling pipe of a pre-cooler which had been used in a 70-MPa hydrogen station demonstration project. The cooling pipe consisted of a main pipe, a mechanical joint pipe and a mechanical joint. The main and mechanical joint pipes had been joined using TIG welding. Through chemical composition analysis, microstructure observation and Vickers hardness measurement, it was revealed that the main and mechanical joint pipes had been manufactured from SUS316L and that 316L was the filler metal used for TIG welding. Round-bar specimens were machined out of the main pipe in order to investigate the tensile properties of the base metal. On the other hand, both round-bar specimen without reinforcement and square-bar specimens with reinforcement were fabricated from the weld-joint. Using the three types of specimens, slow strain rate tensile tests were performed in 0.1 MPa nitrogen gas and in 115 MPa hydrogen gas at a temperature of -40 °C. Reduction of area (RA), φ, for the round base-metal specimen, the round weld-joint specimen and the square weldjoint specimen were respectively, 83.5 %, 71.3 % and 81.4 % in nitrogen gas, whereas the related values in hydrogen gas were 60.1 %, 61.3 % and 40.1 %. In other words, the RA for the three types of specimens was smaller in hydrogen gas than in nitrogen gas. Dimples were formed on the fracture surfaces of the three specimen types in nitrogen gas, whereas both dimples and quasi-cleavages were formed in hydrogen gas.

本文言語英語
ホスト出版物のタイトルMaterials and Fabrication
出版社American Society of Mechanical Engineers (ASME)
ISBN(電子版)9780791858004
DOI
出版ステータス出版済み - 2017
イベントASME 2017 Pressure Vessels and Piping Conference, PVP 2017 - Waikoloa, 米国
継続期間: 7 16 20177 20 2017

出版物シリーズ

名前American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
6B-2017
ISSN(印刷版)0277-027X

その他

その他ASME 2017 Pressure Vessels and Piping Conference, PVP 2017
国/地域米国
CityWaikoloa
Period7/16/177/20/17

All Science Journal Classification (ASJC) codes

  • 機械工学

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