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51313-02490-Experiences with HISC of Duplex Stainless Steel Components in Subsea Service with CP

Product Number: 51313-02490-SG
ISBN: 02490 2013 CP
Author: Mads Aursand
Publication Date: 2013
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Duplex- and Superduplex stainless steels have over the last decades seen extensive use in the oil and gas industry for subsea production systems. These stainless steels offer a desirable combination of mechanical properties corrosion resistance cost and availability that has made them a favored material selection for a wide range of Oil and Gas applications. A number of notable failure cases have however drawn attention to the risk of hydrogen embrittlement or hydrogen induced stress cracking (HISC) associated with the use of duplex stainless steels for subsea components that are exposed to external cathodic protection.

Improved awareness within the industry and focus on avoiding HISC have over the later years led to an introduction of design criteria intended to limit stress/strain in duplex stainless steel components for subsea use. The significance of fabrication manufacture and material aspects have received a good deal of attention as well. Specific material- and design requirements including perceived degree of conservatism and potential gaps in current guidelines are however still debated topics.

Some recent failure cases involving HISC in duplex- and superduplex stainless steel components are presented in this paper. Findings from the failure examinations have been discussed in light of current guidelines and recommendations for avoiding HISC.

Keywords: Duplex Stainless Steel Hydrogen Induced Stress Cracking Subsea Cathodic Protection
 

Duplex- and Superduplex stainless steels have over the last decades seen extensive use in the oil and gas industry for subsea production systems. These stainless steels offer a desirable combination of mechanical properties corrosion resistance cost and availability that has made them a favored material selection for a wide range of Oil and Gas applications. A number of notable failure cases have however drawn attention to the risk of hydrogen embrittlement or hydrogen induced stress cracking (HISC) associated with the use of duplex stainless steels for subsea components that are exposed to external cathodic protection.

Improved awareness within the industry and focus on avoiding HISC have over the later years led to an introduction of design criteria intended to limit stress/strain in duplex stainless steel components for subsea use. The significance of fabrication manufacture and material aspects have received a good deal of attention as well. Specific material- and design requirements including perceived degree of conservatism and potential gaps in current guidelines are however still debated topics.

Some recent failure cases involving HISC in duplex- and superduplex stainless steel components are presented in this paper. Findings from the failure examinations have been discussed in light of current guidelines and recommendations for avoiding HISC.

Keywords: Duplex Stainless Steel Hydrogen Induced Stress Cracking Subsea Cathodic Protection
 

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Product Number: 51300-07494-SG
ISBN: 07494 2007 CP
Author: Espen Heier, Bjorn Andreas Hugaas, and Odd Haukas-Eide
Publication Date: 2007
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