The migration of H through a maraging steel was studied, at between 373 and 590C, by using an ultra-high vacuum quadrupole mass spectrometry method and an input gas pressure of about 0.1MPa. The permeation parameters (table 74) were determined as a function of the aging time.

The Permeability of Hydrogen in 18Ni Maraging Steel. D.P.Yao, W.X.Chen, X.K.Sun, J.Xu: Scripta Metallurgica, 1988, 22[5], 611-5