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The Selection of Stainless Steels for Seawater Pumps

Picture for The Selection of Stainless Steels for Seawater Pumps
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Available cast austenitic and duplex stainless steel grades and their castability and corrosion resistance. The conclusion is that superduplex stainless steel offers the best combination of properties for seawater cooling and firewater pumps.

Product Number: 51315-5446-SG
ISBN: 5446 2015 CP
Author: Roger Francis
Publication Date: 2015
Industries: Maritime , Materials Selection and Design
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Traditionally copper alloys, such as gunmetals and nickel aluminium bronzes, have been used for seawater cooling and firewater pumps. The drawbacks to these copper alloys are their susceptibility to erosion corrosion at high water velocities and to pitting in polluted waters containing sulphides. Austenitic cast iron pump cases have suffered from SCC (stress corrosion cracking ) problems after 1 to 6 years in warm seawater. However, with the development of AOD (argon oxygen decarburization) melting and the use of nitrogen as an alloying element, cast stainless steels offered a viable alternative. These alloys do not have the velocity restrictions of copper alloys, and also have excellent resistance to sulphide in polluted water. The present paper describes the available cast austenitic and duplex stainless steel grades and discusses both their castability and corrosion resistance. The conclusion is that superduplex stainless steel offers the best combination of properties for this application. Some case histories are presented showing the successful use of superduplex and problems arising with other stainless steel grades.

Key words: conference papers, conference papers 2015, Duplex Stainless Steel,  Crevice Corrosion, Casting, Seawater

 

Traditionally copper alloys, such as gunmetals and nickel aluminium bronzes, have been used for seawater cooling and firewater pumps. The drawbacks to these copper alloys are their susceptibility to erosion corrosion at high water velocities and to pitting in polluted waters containing sulphides. Austenitic cast iron pump cases have suffered from SCC (stress corrosion cracking ) problems after 1 to 6 years in warm seawater. However, with the development of AOD (argon oxygen decarburization) melting and the use of nitrogen as an alloying element, cast stainless steels offered a viable alternative. These alloys do not have the velocity restrictions of copper alloys, and also have excellent resistance to sulphide in polluted water. The present paper describes the available cast austenitic and duplex stainless steel grades and discusses both their castability and corrosion resistance. The conclusion is that superduplex stainless steel offers the best combination of properties for this application. Some case histories are presented showing the successful use of superduplex and problems arising with other stainless steel grades.

Key words: conference papers, conference papers 2015, Duplex Stainless Steel,  Crevice Corrosion, Casting, Seawater

 

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Picture for 09194 Evaluation of Crevice Corrosion Resistance of Duplex and Super Duplex Stainless Steels for Sea
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09194 Evaluation of Crevice Corrosion Resistance of Duplex and Super Duplex Stainless Steels for Seawater Pumps

Product Number: 51300-09194-SG
ISBN: 09194 2009 CP
Author: Hiroshi Yakuwa, Katsuhiro Mitsuhashi, Kenichi Sugiyama and Matsuho Miyasaka
Publication Date: 2009
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The crevice corrosion resistance of duplex and super duplex stainless steels used for seawater pumps was evaluated by comparing the to results tests conducted using actual seawater  with the behavior of the stainless steels in artificial seawater
Picture for 11351 The Corrosion of Superduplex Stainless Steel in Different Types of Seawater
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11351 The Corrosion of Superduplex Stainless Steel in Different Types of Seawater

Product Number: 51300-11351-SG
ISBN: 2011 11351 CP
Author: R Francis, G Byrne and G Warburton
Publication Date: 2011
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Superduplex stainless steels have been used in seawater systems since 1986 as castings and since 1990 as wrought product. The present paper describes some of the service environments commonly in use and the conditions that give rise to specific operating potentials. The limits of use under these conditions are described utilizing both laboratory and service experience.
Picture for Experience with Standard Duplex Stainless Steel Seawater Pump in Arabian Gulf Seawater Conditions
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51314-3733-Experience with Standard Duplex Stainless Steel Seawater Pump in Arabian Gulf Seawater Conditions

Product Number: 51314-3733-SG
ISBN: 3733 2014 CP
Author: Sivuyile Funani
Publication Date: 2014
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