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Stress Corrosion Cracking of Superduplex Stainless Steels for Use in H2s Containing Environments in Oil and Gas Production.

Austenitic-ferritic stainless steels are widely used in petroleum industries particularly for submarine gas and oil lines and other offshore applications because of their reasonable cost good mechanical and thermal properties and resistance to stress corrosion and pitting. It is generally accepted that these alloys present stress corrosion resistance in chloride media superior to austenitic grades as a result of the inhibition of the SCC initiation by pitting corrosion. In this paper it is studied the corrosion behavior of two grades 80ksi (solution annealed) and 125ksi (cold hardened) of superduplex composition UNS S32750. The two materials have been tested by two different methods: slow strain rate test (SSRT) and four point bend (4PB) at three different temperatures: 24ºC 90ºC and 232ºC. In this way the sulphide stress cracking corrosion (SSC) and the stress corrosion cracking (SCC) at two different temperatures have been studied for both grades. The sour environment consisted of a mixture of gases: CO2 at 100 psi and H2S at 14.7 psi in contact with a solution of type A with initial PH of 3.5. The applied stress was 100% of the actual yield strength. Special attention has been made in the characterization of the tested specimens. In the case of SSRT the primary fracture surface and gauge section of the specimens have been examined directly by SEM to determine the presence of secondary cracking and brittle area. In the case of the 4PB metallographically prepared samples have been observed by optical microscopy and SEM to evaluate the presence of cracking and to analyze the origin and the propagation of the cracking.

Product Number: 51319-13370-SG
Author: Pilar Esteban
Publication Date: 2019
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