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51315-5527-Influence of Alloying Elements on the Pitting Corrosion Resistance of CrMn Stainless Steels in Simulated Drilling Environments

 This paper presents the role of non-magnetic stainless steels' chemical composition on pitting corrosion susceptibility in chloride-containing solutions at different temperatures. Pitting and repassivation potentials of several grades were measured.

Product Number: 51315-5527-SG
ISBN: 5527 2015 CP
Author: Helmuth Sarmiento Klapper
Publication Date: 2015
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Non-magnetic austenitic stainless steels are CrMn ferrous alloys with varying nickel nitrogen and molybdenum contents which were developed more than 30 years ago to enable magnetic surveying of the oil and gas well trajectories. Their use has expanded to also include widespread application in MWD and LWD technologies. In addition to their non-magnetic properties the stainless steel alloys are also designed to reach yield strength near 145 ksi (1000 MPa) in combination with high toughness and galling resistance. Additionally corrosion and wear resistance are also required to operate in corrosive drilling environments and resist contact with the formation and with rock cuttings respectively. Because of their versatility non-magnetic stainless steels have become the most commonly used grades of steel in directional and logging drilling technology. This paper presents the role of their chemical composition on pitting corrosion susceptibility in chloride-containing solutions at different temperatures. Pitting and repassivation potentials of several grades were measured using cyclic potentiodynamic polarization and electrochemical noise tests. Experimental results show that chromium manganese and molybdenum play a decisive role on the pitting corrosion resistance of non-magnetic stainless steels at room temperature. The present study demonstrates the complexity of localized corrosion and challenge in defining a simple relationship between chemical composition and localized corrosion resistance which will operate at elevated temperature.

 

Key words: conference papers, conference papers 2015, Pitting corrosion, austenitic stainless steel, cyclic potentiodynamic test, electrochemical noise

Non-magnetic austenitic stainless steels are CrMn ferrous alloys with varying nickel nitrogen and molybdenum contents which were developed more than 30 years ago to enable magnetic surveying of the oil and gas well trajectories. Their use has expanded to also include widespread application in MWD and LWD technologies. In addition to their non-magnetic properties the stainless steel alloys are also designed to reach yield strength near 145 ksi (1000 MPa) in combination with high toughness and galling resistance. Additionally corrosion and wear resistance are also required to operate in corrosive drilling environments and resist contact with the formation and with rock cuttings respectively. Because of their versatility non-magnetic stainless steels have become the most commonly used grades of steel in directional and logging drilling technology. This paper presents the role of their chemical composition on pitting corrosion susceptibility in chloride-containing solutions at different temperatures. Pitting and repassivation potentials of several grades were measured using cyclic potentiodynamic polarization and electrochemical noise tests. Experimental results show that chromium manganese and molybdenum play a decisive role on the pitting corrosion resistance of non-magnetic stainless steels at room temperature. The present study demonstrates the complexity of localized corrosion and challenge in defining a simple relationship between chemical composition and localized corrosion resistance which will operate at elevated temperature.

 

Key words: conference papers, conference papers 2015, Pitting corrosion, austenitic stainless steel, cyclic potentiodynamic test, electrochemical noise

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