07093 SCC Resistance of Supermartensitic Stainless Steels in Formation Water: Influence of Material Chemical Composition, Welding Parameters, and Corrosion Conditions

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Product Number: 51300-07093-SG

ISBN: 07093 2007 CP

Author: Jerome Peultier, Christian Lojewski, Bernard Bonnefois, Patrick Toussaint, and Lionel Coudreuse

Publication Date: 07093

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Stress corrosion cracking (SCC) sensitivity of the girth welds of supermartensitic stainless steels (SMSS) tubes seems closely linked to the thermal history encountered by the heat affected zones and chemical composition. The aim of the work presented in this paper was to investigate the influences of welding parameters (welding process, cooling rate …), chemical composition of the base plate and environment on the SCC sensitivity. Results of four point bend tests performed on plate with weld beads in simulated formation water with and without H2S are presented and discussed. It appears that the SCC mechanism is enhanced by a decrease in the pH value, an increase in the temperature and/or the presence of H2S. On the contrary a decrease of the cooling rate (high welding heat input) used for the last deposited bead or an increase of the chromium and molybdenum concentrations improves the SCC resistance. This study, supported by the European Community, was developed to improve the understanding of this new corrosion mechanism and to propose solution for the safer use of SMSS in oil and gas applications.