In 2005, the Japanese government issued the technical standard (the General High-Pressure Gas Safety Ordinance, hereinafter referred to as the General Ordinance) for hydrogen refueling stations (HRSs) that provide fuel to fuel cell vehicles (FCVs) equipped with a 35MPa hydrogen container on board[1]. Then, the maximum storage pressure of container on board increased from 35MPa to 70MPa. Along with this, the maximum storage pressure of facilities of HRSs also increased from 40MPa to 82MPa[2]. In Japan, many HRSs are being built to realize hydrogen society. For this purpose, it is urgent to select materials to be used in a high pressure hydrogen environment and to establish a range of use.

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