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Following accidents which have occurred in the petroleum and gas industry since 1950, investigations have shown that one reason for these catastrophic failures was the use of low-alloy steels not specifically adapted to wet H(2)S environments. This was confirmed by recent inspection programmes of pressure vessels, which revealed substantial cracking. This report is a synthesis of the ECSC's research in this area, and includes an analysis of data in recent literature. After analysing the hydrogen failure mechanisms and, in particular, the relative effects of environmental and metallurgical parameters, industrial solutions are suggested. For the most severe environments, they require: - a low inclusion level; - proper adaptation of chemical compositions to low-C, limited Mn levels; - strict limitation of segregation effects, and - welding procedures which limit the maximum hardness in the HAZ.

Additional information

Authors: BLONDEAU R, Creusot-Loire Industrie, Le Creusot (FR)
Bibliographic Reference: EUR 13422 FR (1991) 53 pp., FS, ECU 6.25
Availability: (2)
ISBN: ISBN 92-826-2669-5
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