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09297 An Influence of Cathodic Protection Potential on the Mechanical Properties of the Super Duplex Stainless Steel Tube

Picture for 09297 An Influence of Cathodic Protection Potential on the Mechanical Properties of the Super Duplex
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Product Number: 51300-09297-SG
ISBN: 09297 2009 CP
Author: Alan Dobson and Xiaoxue An
Publication Date: 2009
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$20.00
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Super duplex stainless steel is susceptible to Hydrogen Induced Stress Cracking (HISC) under the influence of a Cathodic Protection (CP) system. A study has been carried out investigating the influence of CP potential on mechanical degradation of UNS S32750 Super Duplex umbilical tube using a Slow Strain Rate Testing (SSRT) technique. The testing, at strain rate of 1x10-6 s-1, was performed on specimens polarized in the range of -1050 mV to -400 mV at ambient temperature in ASTM artificial seawater conditioned with and without hydrogen pre-charging. The impact of HISC was evaluated through an assessment of the ratio of the elongation at fracture in the seawater to that in air.The influence of CP potential, hydrogen content, and microstructure of the tube were examined. The ductility and fracture mechanism of the samples were studied by SEM.

Keywords: Super Duplex Stainless Steel tube, Cathodic Protection Potential, HISC, Slow Strain Rate Testing
Super duplex stainless steel is susceptible to Hydrogen Induced Stress Cracking (HISC) under the influence of a Cathodic Protection (CP) system. A study has been carried out investigating the influence of CP potential on mechanical degradation of UNS S32750 Super Duplex umbilical tube using a Slow Strain Rate Testing (SSRT) technique. The testing, at strain rate of 1x10-6 s-1, was performed on specimens polarized in the range of -1050 mV to -400 mV at ambient temperature in ASTM artificial seawater conditioned with and without hydrogen pre-charging. The impact of HISC was evaluated through an assessment of the ratio of the elongation at fracture in the seawater to that in air.The influence of CP potential, hydrogen content, and microstructure of the tube were examined. The ductility and fracture mechanism of the samples were studied by SEM.

Keywords: Super Duplex Stainless Steel tube, Cathodic Protection Potential, HISC, Slow Strain Rate Testing
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Experience has shown that stainless steels can suffer from Hydrogen Induced Stress Cracking (HISC) under cathodic protection in seawater.  This paper presents results from a test program examining the HISC susceptibility of 25% Cr super duplex stainless steel (UNS S32750) at temperatures up to 1500C.
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This paper will focus on design parameters required for cathodic protection (CP) of stainless steel screens with particular attention on design and operational current density values and suitable protection criteria. The detrimental effects of overprotection will also be discussed. 

 
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