AUSTENITIC HIGH Mn STAINLESS STEEL WELD JOINT FOR HIGH-PRESSURE HYDROGEN GAS AND LIQUID HYDROGEN AND METHOD OF PRODUCING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a weld joint that is used under high-pressure hydrogen gas and liquid hydrogen environments, has excellent mechanical nature, and is excellent in hydrogen embrittlement resistance sensitivity and a method of producing the same.SOLUTION: A weld joint is characterized in that a weld metal has the chemical composition comprising, by mass%, C: 0.2% or less, Si: 2.0% or less, Mn: 5.5-14.5%, Cr: 13.5-22.0%, Ni: 3.5-12.5%, Cu: 1-5% and N: 0.01-0.4%, with the balance being Fe and inevitable impurities, wherein the ratio between Creq and Nieq (Creq/Nieq) is 1.10 or less, and the volume fraction of a δ ferrite phase is 10% or less.