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Improved Models for Life Assessment Inspections and Repair-Replace Decisions For HIGH TEMPERATURE HYDROGEN ATTACK (HTHA)

HIGH-TEMPERATURE HYDROGEN ATTACK (HTHA) of steels is an extremely interesting topic in petrochemical industrial applications while a predictive physical model still does not exist. A number of studies carried out in the world are unambiguous confirmation of that statement. Bearing in mind multiple effects of hydrogen in certain metals the specific mechanism of high-temperature hydrogen attack embrittlement is manifested depending on the experimental conditions.The susceptibility of ASTM 204 Gr A steel to hydrogen-assisted cracking of refinery reactor retired was evaluated by mechanical fracture mechanics specimens. The material of zone with indication and zone without indications of the reactor was evaluated. Were loaded in tension and impact mechanical test to evaluate the probability of occurrence of the hydrogen-assisted cracking phenomenon. Fractography NDT and SEM-EDX analysis carried out on the fracture surfaces of the ruptured beams revealed was no evidence of the mechanisms of the crack propagation. Under both conditions the failure was cavity coalescence accommodated with plastic deformation. The results didn´t show the influence of hydrogen-induced embrittlement on the initiation of the fracture and the plasticity of the crack tip during the propagation of the crack where the latter becomes localized and uniform over the fracture surface. From the observations a three-stage crack propagation and lamination process and are proposed. Also the fracture toughness of the samples was evaluated by linear elastic fracture mechanics and the validity of the results are discussed. This result was very important to the refinery to develop plan inspections and make sound operations decisions based on the best available techniques.Keywords: Carbon steel corrosion HIGH TEMPERATURE HYDROGEN ATTACK (HTHA)

Product Number: 51319-13473-SG
Author: Raul Gonzalez
Publication Date: 2019
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51314-4212-Evaluation of HTHA Effect on Carbon Steel and Carbon 0.5 Mo Exchanger

Product Number: 51314-4212-SG
ISBN: 4212 2014 CP
Author: Musaed AL-Arada
Publication Date: 2014
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