Slide 1

1 Quantifying the hydrogen embrittlement of pipeline steels for safety considerations ( #186) L. Briottet, I. Moro, P. Lemoine CEA,LITEN, DTBH/LCTA, F-38054 Grenoble, France LITEN/DTBH/LCTASept. 14, 2011 International Conference on Hydrogen Safety "Enabling Progress and Opportunities" September 12-14, 2011 San Francisco, California-USA Slide 2 LITEN/DTBH/LCTAICHS 2011Sept. 14, 2011 2 Scope Development of a hydrogen pipeline delivery infrastructure High initial capital cost No recognized international methods to choose materials - specific application - very different testing conditions - materials susceptibility to HE - improving safety coefficients for component design How to quantify Hydrogen Embrittlement under hydrogen gas pressure? French National Research Agency projects CATHY-GDF, CESTAR Slide 3 LITEN/DTBH/LCTAICHS 2011Sept. 14, 2011 3 Approach API grade X80 ferrito-pearlitic steel Various mechanical tests under hydrogen high pressure Many ways to quantify hydrogen embrittlement Comparison of some possible embrittlement indices Discussion Slide 4 LITEN/DTBH/LCTAICHS 2011Sept. 14, 2011 4 Monotonic loading Up to 35 MPa H 2 Tensile test Disk pressure Test (ISO 11114-4 method A) P He / P H2 Slide 5 LITEN/DTBH/LCTAICHS 2011Sept. 14, 2011 5 Cyclic loading Fatigue Crack Growth Fracture mechanics / Dynamic loading Up to 35 MPa H 2 Compact Tensile Monotonic loading Fracture toughness Single Edge Notch Tensile specimen Initial crack Slide 6 LITEN/DTBH/LCTAICHS 2011Sept. 14, 2011 6 AL Air Inert gas Loading conditions H2H2 30 MPa H 2 Fracture mechanics / Static loading Wedge Opening Load - Static loading (ISO 11114-4 method C) Slide 7 LITEN/DTBH/LCTAICHS 2011Sept. 14, 2011 7 High-strength steel grade API X80 CMnSiPSFe 0.0751.860.350.015