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FP5

Role of stress on hydrogen attack

Funded under: FP5

Abstract

Many applications of low-alloy ferretic steels, such as their use as structural materials for hydroprocessing reactors in petrochemical plants, impose severe conditions in terms of applied stresses and environmental degradation. In view of the introduction of new steel grades into service, this work presents the results of a study carried out on 2.25Cr-1Mo steel on the combined effects of creep and hydrogen attack. As a preliminary base for the assessment, creep experiments were carried out in air 600 degrees Celsius and creep and stress-free tests were carried out in 220 bar hydrogen at the same temperature. With respect to creep testing in air, the hydrogen environment resulted in significant losses in both creep strength and ductility. A synergistic effect of creep stress and hydrogen attack was observed, the combined action of the two factors leading to more rapid degradation than just the sum of the two effects taken separately.

Additional information

Authors: BAKER A, British Energy Plc, Barnwood, Gloucester (GB);MANOLATOS P, European Commission, Joint Research Centre, Institute for Advanced Materials, Petten (NL);CASTELLO P, European Commission, Joint Research Centre, Institute for Advanced Materials, Petten (NL);HURST R, European Commission, Joint Research Centre, Institute for Advanced Materials, Petten (NL)
Bibliographic Reference: Paper presented: EUROMAT 2000, Tours (FR) 7-9 November 2000
Availability: Available from European Commission, Joint Research Centre, Ispra (IT)
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