STEEL STRUCTURE FOR HYDROGEN GAS, METHOD FOR PRODUCING HYDROGEN STORAGE TANK, AND METHOD FOR PRODUCING HYDROGEN LINE PIPE

摘要

Provided is a steel structure for hydrogen gas such asa hydrogen storage tank or a hydrogen line pipe whichachieves a lower fatigue crack propagation rate in ahigh-pressure hydrogen atmosphere than steels used in the relatedart and has high hydrogen embrittlement resistance.The steel structure for hydrogen gas, which has highhydrogen embrittlement resistance in high-pressure hydrogengas, has a steel microstructure including any one of 10% to95% of bainite on an area-ratio basis, 10% to 95% ofmartensite on an area-ratio basis, and 10% to 95% ofpearlite on an area-ratio basis, with the balance beingsubstantially ferrite.