Development of material testing equipment in high pressure gaseous hydrogen and international collaborative work of a testing method for a hydrogen society

Due to such a background, we believe the development of an experimental equipment that allows material testing in hydrogen gas surpassing 100 MPa, the establishment of a material testing method that allows accurate evaluation of hydrogen embrittlement and accumulation of test data using such equipment, and the diffusion to and sharing of knowledge of such material test data with related industries will greatly contribute to the international standardization of the evaluation method and qualification of materials compatibility for high-pressure gaseous hydrogen equipment. In this paper, we overview the properties of metallic materials that are demanded for use in high-pressure gaseous hydrogen equipment, including the situations in Japan and overseas. Next, we discuss the material testing equipment in highpressure gaseous hydrogen at AIST, review the material testing methods using such equipment, and describe the international comparison of the material testing methods. Then we discuss our contribution that we may make toward the international standardization of the material testing method.