Menu
Search
Filters
Close
Menu

Save 20% on select titles with code HIDDEN24 - Shop The Sale Now

Influence of K-Rate and Hydrogen Charging on Fracture Toughness of a Super Duplex Stainless Steel

Picture for Influence of K-Rate and Hydrogen Charging on Fracture Toughness of a Super Duplex Stainless Steel
Available for download

To evaluate through fracture toughness tests the susceptibility of SDSS to HISC and to determine the effect of the cathodic protection potential and the stress intensity factor rate (K-rate).

Product Number: 51318-10891-SG
Author: Carlos Eduardo Fortis Kwietniewski / Tiago Renck / Fabrício Pinheiro dos Santos / Adriano Scheid / Marcelo Sartori / Afonso Reguly
Publication Date: 2018
Industry: Materials Selection and Design
$0.00
$20.00
$20.00

Super duplex stainless steels (SDSS) combine excellent corrosion resistance especially to the localized forms of corrosion with medium to high mechanical strength. This unique combination of properties has made these alloys very successful in the oil and gas industry. However, in some specific scenarios, even these steels have to be protected against corrosion, which is usually accomplished by cathodic protection. The synergic effect of hydrogen produced during cathodic protection with service mechanical loads may produce the embrittlement phenomenon known as hydrogen induced stress cracking (HISC). Indeed, documented cases of failure due to HISC have somehow deteriorated the image of the SDSS and raised some concerns. The aim of this investigation is to evaluate through fracture toughness tests the susceptibility of SDSS to HISC and more specifically to determine the effect of the cathodic protection potential and the stress intensity factor rate (K-rate) on the results produced. Within the range of parameters studied here, the degradation of fracture toughness due to HISC is strongly dependent on the testing parameters employed, especially the cathodic potential with a less pronounced effect of the K-rate. The results also suggest that the issue of HISC might not be a material’s problem but instead can be mitigated by the optimization of cathodic protection design.

Keywords: Super Duplex Stainless Steel (SDSS), Fracture Toughness, Hydrogen Induced Stress Cracking (HISC)

 

Super duplex stainless steels (SDSS) combine excellent corrosion resistance especially to the localized forms of corrosion with medium to high mechanical strength. This unique combination of properties has made these alloys very successful in the oil and gas industry. However, in some specific scenarios, even these steels have to be protected against corrosion, which is usually accomplished by cathodic protection. The synergic effect of hydrogen produced during cathodic protection with service mechanical loads may produce the embrittlement phenomenon known as hydrogen induced stress cracking (HISC). Indeed, documented cases of failure due to HISC have somehow deteriorated the image of the SDSS and raised some concerns. The aim of this investigation is to evaluate through fracture toughness tests the susceptibility of SDSS to HISC and more specifically to determine the effect of the cathodic protection potential and the stress intensity factor rate (K-rate) on the results produced. Within the range of parameters studied here, the degradation of fracture toughness due to HISC is strongly dependent on the testing parameters employed, especially the cathodic potential with a less pronounced effect of the K-rate. The results also suggest that the issue of HISC might not be a material’s problem but instead can be mitigated by the optimization of cathodic protection design.

Keywords: Super Duplex Stainless Steel (SDSS), Fracture Toughness, Hydrogen Induced Stress Cracking (HISC)

 

Product tags
Also Purchased
Picture for 51316-6981-HISCC Resistance and Improvement Methods For Duplex and Super Duplex Stainless Steels
Available for download

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

Product Number: 51316-6981-SG
ISBN: 6981 2016 CP
Author: Glenn Byrne
Publication Date: 2016
$20.00

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.
Picture for 11294 Susceptibility of Hydrogen Induced Stress Cracking of Duplex SS at Elevated Temperature
Available for download

11294 Susceptibility of Hydrogen Induced Stress Cracking of Duplex Stainless Steel at Elevated Temperature

Product Number: 51300-11294-SG
ISBN: 2011 11294 CP
Author: Roy Johnson, Bard Nyhus, and Ole Edvard Kongstein
Publication Date: 2011
$20.00

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.
Picture for In-service Embrittlement of 25%Cr Super Duplex Stainless Steel
Available for download

51318-10612-In-service Embrittlement of 25%Cr Super Duplex Stainless Steel

Product Number: 51318-10612-SG
Author: Mikihiro Sakata / Ichiro Seshimo / Tomoaki Kiso / Toshiaki Okabe
Publication Date: 2018
$20.00

Metallurgical investigations on a welded sample of 25% Cr super duplex stainless steel (UNS S32750) from a vessel that had operated above 300-350°C (570-660°F) for six months, resulting in brittle fracture.
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support