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UNS S32707 combinded to UNS s31266; an alternative to titanium for seawater-cooled heat exchangers
Sandvik Materials Technology, Sweden.
Sandvik Materials Technology, Sweden.
Industeel, France.
RISE - Research Institutes of Sweden, Materials and Production, KIMAB. (Institut de la Corrosion)
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2017 (English)In: NACE - International Corrosion Conference SeriesVolume 3, 2017, Pages 2005-2018Corrosion Conference and Expo 2017; New Orleans; United States; 26 March 2017 through 30 March 2017, National Assoc. of Corrosion Engineers International , 2017, p. 2005-2018Conference paper, Published paper (Refereed)
Abstract [en]

In the process industry, seawater is commonly used when available to cool process fluids. However chlorination of the seawater is widely used to limit any microbial activity; that makes the environment quite aggressive. Chlorination oxidizes and increases the corrosion potential to approximately +600mVSCE for stainless steels and leads to higher susceptibility to localized corrosion. Super duplex stainless steels, PRENw >40, in seawater-cooled heat exchangers can be used at limited temperatures otherwise Ti Gr.2 shall be used for equipment integrity over the service life. Recent results with combination of hyper duplex UNS S32707 tubes and super austenite UNS S31266 plate, with PRENw of 49 resp. 53, for seawater-cooled heat exchangers are presented. Testing is performed in seawater cooled scale model heat exchangers with 0.5 ppm residual chlorine during a period of 18 months. Thus, it shows a corrosion resistance of the materials at a heat flux representative to a tube skin temperature up to 95°C inside in the seawater. These new results also show a good correlation with the field service and help to challenge the use of Titanium in seawater-cooled heat exchangers.

Place, publisher, year, edition, pages
National Assoc. of Corrosion Engineers International , 2017. p. 2005-2018
Keywords [en]
Chlorination, Cooling, Heat exchanger, Hyper duplex stainless steels, Pitting corrosion, Seawater, Super austenitic stainless steels, UNS S31266, UNS S32707, Austenitic stainless steel, Corrosion, Corrosion resistance, Heat exchangers, Heat flux, Heat resistance, Pitting, Titanium, Corrosion potentials, Duplex stainless steel, Equipment integrity, Microbial activities, Super duplex stainless steel, Super-austenitic stainless steels
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-40018Scopus ID: s2.0-85027964317ISBN: 9781510840348 (print)OAI: oai:DiVA.org:ri-40018DiVA, id: diva2:1361309
Conference
NACE - International Corrosion Conference Series Volume 3, 2017, Pages 2005-2018 Corrosion Conference and Expo 2017; New Orleans; United States; 26 March 2017 through 30 March 2017
Available from: 2019-10-15 Created: 2019-10-15 Last updated: 2019-10-15Bibliographically approved

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