Effect of Mercury Velocity on Corrosion of Type 316L Stainless Steel in a Thermal Convection Loop

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Description

Two 316L thermal convection loops (TCLs) containing several types of 316L specimens circulated mercury continuously for 2000 h at a maximum temperature of 300 C. Each TCL was fitted with a venturi-shaped reduced section near the top of the hot leg for the purpose of locally increasing the Hg velocity. Results suggest that an increase in velocity from about 1.2 m/min (bulk flow) to about 5 mmin (reduced section) had no significant impact on compatibility of 316L with Hg. In addition, various surface treatments such as gold-plating, chemical etching, polishing, and steam cleaning resulted in little or no influence on ... continued below

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42 pages

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Pawel, SJ March 23, 2001.

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Description

Two 316L thermal convection loops (TCLs) containing several types of 316L specimens circulated mercury continuously for 2000 h at a maximum temperature of 300 C. Each TCL was fitted with a venturi-shaped reduced section near the top of the hot leg for the purpose of locally increasing the Hg velocity. Results suggest that an increase in velocity from about 1.2 m/min (bulk flow) to about 5 mmin (reduced section) had no significant impact on compatibility of 316L with Hg. In addition, various surface treatments such as gold-plating, chemical etching, polishing, and steam cleaning resulted in little or no influence on compatibility of 316L with Hg when compared to nominal mill-annealed/surface-ground material. A sensitizing heat treatment also had little/no effect on compatibility of 316L with Hg for the bulk specimen, although intergranular attack was observed around the specimen holes in each case. It was determined that carburization of the hole area had occurred as a result of the specimen fabrication process potentially rendering the specimens susceptible to corrosion by Hg at these locations. To avoid sensitization-related compatibility issues for SNS components, selection of low carbon grades of stainless steel and control of the fabrication process is recommended.

Physical Description

42 pages

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  • Other Information: PBD: 23 Mar 2001

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  • Report No.: ORNL/TM-2001/18
  • Grant Number: AC05-96OR22464
  • DOI: 10.2172/777774 | External Link
  • Office of Scientific & Technical Information Report Number: 777774
  • Archival Resource Key: ark:/67531/metadc725266

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  • March 23, 2001

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  • Sept. 29, 2015, 5:31 a.m.

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  • March 21, 2016, 12:51 p.m.

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Pawel, SJ. Effect of Mercury Velocity on Corrosion of Type 316L Stainless Steel in a Thermal Convection Loop, report, March 23, 2001; Tennessee. (digital.library.unt.edu/ark:/67531/metadc725266/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.