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  5. ISO 15926-4 Edition 3
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  7. HIGH TEMPERATURE HYDROGEN ATTACK

HIGH TEMPERATURE HYDROGEN ATTACK

A class with identifier http://staging4.data.posccaesar.org/iso/15926-4/rdl/RDS2220194

MetadataThis section provides information about 'RDS2220194'.

DefinitionHIGH TEMPERATURE HYDROGEN ATTACK is a <DESTRUCTIVE ACTION> which concerns steels operating at elevated temperatures (typically above 400&#176;C) in hydrogen environments. It iresults in hydrogen dissociating and dissolving in the steel, and then reacting with the carbon in solution in the steel to form methane. This can result in either surface decarburisation, when the reaction mostly occurs at the surface and draws carbon from the material, or internal decarburisation when atomic hydrogen penetrates the material and reacts with carbon to form methane, which accumulates at grain boundaries and/or precipitate interfaces, and cannot diffuse out of the steel. This causes the fissures and cracking which are typical of HTHA
ISO number26492
RDS numberRDS2220194
SourceTWI
Activity or Event

AlignmentThis section lists the most specific P2-superclasses of 'RDS2220194' together with an alignment with corresponding classes in P14, if available.

Activitylis14:Activity

ContextThis section provides super- and subclasses of 'RDS2220194'.