Patent ID: 7393597
Filing Date: 2008-07-01
Classification: B23K,C22C,Y10T

Abstract:
1. A welded joint of austenitic steel for use in a high pressure hydrogen gas environment comprising at least two base metal portions, each base metal being an austenitic steel, and a weld metal welded to the base metal portions to form a metal weld, characterized in that the metal weld comprises, in mass percent, C: at most 0.04%, Si: at most 1.0%, Mn: at most 3%, P: at most 0.02%, S: at most 0.005%, Cr: 15.0-25.0%, Ni: at least 30%, Mo: at most 10% and/or W: at most 10%, Nb: 2.5-5.0%, and at most 3.0% of Al and/or at most 0.5% Ti in amounts satisfying the following equation: and a remainder of Fe and impurities.