Session: Advances in Materials for Oil and Gas Production (Part III of III)
Stress Corrosion Cracking of Alloy 718 bolts in marine atmosphere (C2026-00265)
Tuesday, March 17, 2026
1:30 PM - 2:00 PM Central
Location: 362 DE
Earn .5 PDH
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Roy Johnsen, Riccardo Rizzo, Jarand Narland, Morten Ro Helsem
Bolts made from 25Cr super duplex stainless steel (25Cr) can be accepted up to 1100C in marine environment containing chlorides according to ISO 21457. Some piping systems have higher temperature and alternative alloys need to be used. Alloy 718 is one alloy that has been presented as an alternative alloy due to a combination of strength, Stress Corrosion Cracking (SCC) resistance, availability and cost. However, limited information about SCC resistance at high temperature is available. Due to this, a test program to investigate the susceptibility of SCC for bolts made from Alloy 718 exposed to marine atmosphere with surface temperature up to 2500C, has been executed. In addition, tests of 25Cr bolts at 1100C has been included in the test program. The test approach follows the philosophy of ISO 15324:2000. However, the temperature, load application and test solution have been tailor made for the project. Real bolts under constant uniaxial load at 100% of actual yield strength and rectangular four point bend (4PB) samples made from real bolts, have been included in the test program. The paper presents the outcome from the tests documenting the SCC resistance of Alloy 718 at temperatures up to 2500C.
