The hydrogen concentration in pipeline steel proved to be dependent on the hydrogen activity at the H entry side and on the applied stress. The critical H concentration in the steel is lower for stressed than for unstressed pipeline steels. The hydrogen charging capacity of media and charging conditions can be quantified in terms of hydrogen activity aH at the entry side. However, this relative parameter is not the only and reliable parameter to assess the likelihood of hydrogen damages, specifically not in case of inhibited hydrogen effusion at the exit side which increases the hydrogen concentration in the steel.

Subject
Materials, Hydrogen permeation, Hydrogen concentration, Hydrogen content, Probes, Pipelines, Stress cracking, Hydrogen charging, Cathodic charging, Stress, Tensile stress, Steel, Hydrogen
Keywords:
hydrogen cracking, critical hydrogen concentration, tensile stress, hollow tensile probes, hydrogen activity
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2004
Association for Materials Protection and Performance (AMPP)
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