Material Questions [

Materials for hydrogen containing components have to meet the requirements of high strength and high ductility to permit a high system pressure and to be appropriate for welding. Respective materials are ultrafine grain steels and thermochemically treated steels. Usually applied dense coatings on the surface of the ferritic steels containing gaseous hydrogen prevent the adsorption of hydrogen unless they are damaged by plastic deformation. An additional requirement for material containing LH2 is a sufficient fracture viscosity. Adequate materials are aluminium alloys, austenitic steels and steels with a high Ni fraction.

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