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Three types of steel in different yield strength categories were chosen for the purpose of studying the resistance of welded high tensile steel to corrosion cracking on exposure to sea water. Steel types FeE 460 (S 460 NL) and FeE 500 V (S500 QL) are the most suitable for practical use in the offshore sector. The main interest here is in steel FeE 500 V of which two heats were therefore investigated. Steel FeE 355 was also tested for comparison purposes. The corrosion tests in natural sea water were performed on the sea water test facility on the Island of Heligoland at a water depth of about 6 m. For this purpose, the samples were mounted on hot dip galvanized steel frames. On one test rack, the samples were exposed under conditions of free corrosion while on the other they were cathodically protected by contact with zinc anodes. After exposure for two and a half years, all the samples were checked for crack propagation and the elongation of the cracks which had occurred was determined. The results of this study lead to the conclusion that, under normal corrosion conditions in sea water, high tensile steels in strength grades up to S 500 inclusive do not react more sensitively than the proven steel grade FeE 355 in regard to corrosion crack growth. In the case of even higher tensile steels, the risk may be enhanced.

Additional information

Authors: DRODTEN P, Thyssen Stahl AG, Duisburg (DE)
Bibliographic Reference: EUR 16119 DE (1997) 37pp., FS, ECU 7.00
Availability: Available from the (2)
ISBN: ISBN 92-828-1014-3
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