Development of High Strength Low Alloy steels for marine applications
In previous research projects the influence of alloying elements on the corrosion behaviour of High Strength Low Alloy steels in seawater was investigated. The favourable role of aluminium and chromium in lowering the general corrosion rate and the lower susceptibility to pitting corrosion of these steels was established. Since the amount of alloying elements can cause manufacturing problems, this investigation took manufacturing possibilities into account. The number of variations of the alloying elements aluminium and chromium was limited to a minimum. To the experimental steels with systematic variation of Cr and Al, a Mo containing type and a steel containing P, Ni and Cu was added. Steel Fe510 was included as a reference. In addition to the investigation of general and pitting corrosion behaviour under immersion conditions, some utilities aspects such as cathodic protection and welding were included in this program. Samples of all the seven steels were exposed during 1.7 years at 50 metres depth in the North Sea. The corrosion rate in this investigation appears to be systematically faster than in previous investigations. Electrochemical measurements in the laboratory showed that this discrepancy may be caused by the different surface treatment and the different seawater temperature at the start of the exposure.
Bibliographic Reference: EUR 12372 EN (1990) 76 pp., MF, ECU 4, blow-up copy ECU 10
Record Number: 199010819 / Last updated on: 1994-12-01
Original language: en
Available languages: en