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Investigation of the Pitting Corrosion Behavior of Austenitic Stainless Steel UNS S20910 Correlated to its Microstructural Condition

Picture for Investigation of the Pitting Corrosion Behavior of Austenitic Stainless Steel UNS S20910 Correlated to its Microstructural Condition
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During drilling operations, the components in the drill string including the bottom hole assembly (BHA) remains in permanent contact with the drilling fluid. Therefore, besides non-magnetic properties and high strength the corrosion resistance of the materials utilized for the BHA plays a decisive role specially in applications involving harsh environments. In fact, strain-hardened CrMn-austenitic steels commonly used in directional drilling technology show a high susceptibility to pitting corrosion and environmentally assisted cracking in drilling fluids with a high chloride (Cl-) content at elevated temperatures.

Product Number: 51323-18877-SG
Author: Helmuth Sarmiento Klapper, Julia Ditmann, Clara Herrera, Merlin Seifert
Publication Date: 2023
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UNS S20910, also known as XM-19 according to ASTM A276, is an austenitic stainless steel used in several industrial applications including oil and gas, chemical, nuclear and cryogenic industry due to its combination of high strength and excellent corrosion resistance. In solution-annealed condition, UNS S20910 shows strength levels significantly higher than conventional austenitic stainless steels. Strength can be further increased by strain hardening without deteriorating other material properties. UNS S20910 exhibits remarkable corrosion resistance in most industrial environments, however, high chloride contents in combination with elevated temperatures may challenge the pitting corrosion resistance of this grade. To enhance pitting corrosion resistance, the microscopic cleanliness can be improved by electro-slag remelting (ESR). In this study, the influence of ESR and strain hardening processes on the pitting susceptibility of UNS S20910 has been investigated. Electrochemical tests were conducted at elevated temperatures in different alkaline chloride-containing solutions ranging from 80 to 140 g/l. Additionally, exposure tests according to ASTM G48 Method A were performed on material in strain-hardened condition. Experimental results confirmed differences in the pitting resistance of UNS S20910 due to the refinement its microstructural cleanliness reached by ESR. It was also confirmed that strain hardening has no detrimental influence on the corrosion behavior of UNS S20910.

UNS S20910, also known as XM-19 according to ASTM A276, is an austenitic stainless steel used in several industrial applications including oil and gas, chemical, nuclear and cryogenic industry due to its combination of high strength and excellent corrosion resistance. In solution-annealed condition, UNS S20910 shows strength levels significantly higher than conventional austenitic stainless steels. Strength can be further increased by strain hardening without deteriorating other material properties. UNS S20910 exhibits remarkable corrosion resistance in most industrial environments, however, high chloride contents in combination with elevated temperatures may challenge the pitting corrosion resistance of this grade. To enhance pitting corrosion resistance, the microscopic cleanliness can be improved by electro-slag remelting (ESR). In this study, the influence of ESR and strain hardening processes on the pitting susceptibility of UNS S20910 has been investigated. Electrochemical tests were conducted at elevated temperatures in different alkaline chloride-containing solutions ranging from 80 to 140 g/l. Additionally, exposure tests according to ASTM G48 Method A were performed on material in strain-hardened condition. Experimental results confirmed differences in the pitting resistance of UNS S20910 due to the refinement its microstructural cleanliness reached by ESR. It was also confirmed that strain hardening has no detrimental influence on the corrosion behavior of UNS S20910.

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Natural gas pipelines are subject to internal corrosion. Internal corrosion of steel pipelines can cause natural gas leakage, leading to wasted energy, explosion hazards, and methane emissions. The U.S. Department of Transport reported numerous case histories of corrosion problems and failures in wet gas pipelines. The National Energy Technology Laboratory (NETL) performed an incident survey from 2010 through 2018 and found that 112 (12%) of these incidents in the U.S. transmission lines were caused by internal corrosion.
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