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The project was aimed at determining if stresses, either residual or external, are able to increase the susceptibility of stainless steels to pitting corrosion. The experimental work was carried out on 304L seamless tubes and on hot-rolled plates of various austenitic and duplex stainless steels.

Different types of corrosion tests in chloride-containing solutions have shown that the presence of tensile stresses on the surface of stainless steels is detrimental for their pitting corrosion resistance. These tensile stresses are the consequence of the presence of residual stresses, which can be either tensile or compression stresses depending on the surface preparation, and applied stresses on the materials. Only when the sum of these two stresses is positive, is the pitting resistance affected (decrease of the pitting potential or the critical pitting temperature).

This shows the very high importance of the initial surface condition of stainless steel, that are in compression, in enhancing applied stresses in service. The consequences of the choice of the method of surface preparation must therefore be taken into account at every step of the manufacturing of stainless steel equipment. nt.

Additional information

Authors: VERNEAU M, CLI, Le Creusot (FR);MECOZZI G, CSM, Roma (IT)
Bibliographic Reference: EUR 19377 EN (2000) 69 pp., EUR 11.50
Availability: Available from EUR-OP Sales Agents
ISBN: ISBN 92-828-9472-X
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