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51316-6981-HISCC Resistance and Improvement Methods For Duplex and Super Duplex Stainless Steels

The paper reviews the history of  Hydrogen Induced Stress Cracking  (HISC) failures of duplex and super duplex stainless steels when deployed subsea and subject to CP at potentials around minus 1V.

Product Number: 51316-6981-SG
ISBN: 6981 2016 CP
Author: Glenn Byrne
Publication Date: 2016
Industry: Maritime
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The paper reviews the history of HISCC failures of duplex and super duplex stainless steels when deployed subsea and subject to CP at potentials around minus 1V. The test methods applied to investigate the problem and subsequently used to develop current design codes that deal with HISCC are reviewed. Data from these investigations is compared with other testing using the same cast and batch of material but where controlled shot peening is used to induce compressive residual stresses in the surface of the test samples. Parent material and cross welded samples were tested. Peened material showed a 10 to 15% improvement in the threshold stress to initiate HISCC.The paper also discussed the Advanced Forging Process ("AFP") production routerecently developed to provide both increased notch toughness at low design temperatures and improved resistance to HISCC in forgings used to make API weld neck and swivel ring flanges for sub sea manifolds. Datais presented showing an increase in the threshold stress from 85% SMYS to 97.5% of SMYS. Thisis attributed to the dissolution of detrimental nitride precipitates within ferrite grains in the forgings and transforming these in to advantageous intragranular reformed austenite.

Key Words; downloadable, superduplex, HISC, toughness, forgings, residual stress, shot peening

 

 

The paper reviews the history of HISCC failures of duplex and super duplex stainless steels when deployed subsea and subject to CP at potentials around minus 1V. The test methods applied to investigate the problem and subsequently used to develop current design codes that deal with HISCC are reviewed. Data from these investigations is compared with other testing using the same cast and batch of material but where controlled shot peening is used to induce compressive residual stresses in the surface of the test samples. Parent material and cross welded samples were tested. Peened material showed a 10 to 15% improvement in the threshold stress to initiate HISCC.The paper also discussed the Advanced Forging Process ("AFP") production routerecently developed to provide both increased notch toughness at low design temperatures and improved resistance to HISCC in forgings used to make API weld neck and swivel ring flanges for sub sea manifolds. Datais presented showing an increase in the threshold stress from 85% SMYS to 97.5% of SMYS. Thisis attributed to the dissolution of detrimental nitride precipitates within ferrite grains in the forgings and transforming these in to advantageous intragranular reformed austenite.

Key Words; downloadable, superduplex, HISC, toughness, forgings, residual stress, shot peening

 

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