PSI - Issue 82

ScienceDirect Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2026) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2026) 000–000 Available online at www.sciencedirect.com

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 82 (2026) 169–173

8 th International Conference on Structural Integrity and Durability (ICSID2025) Prestudy on the susceptibility of P460QL steel to hydrogen-assisted cracking A. H. Jabbari Mostahsan a , Z. Silvayeh a,d , J. Stippich a , M. Mülleder b , C. Commenda c , C. Schindler b , P. Auer a , T. Hafner d , N. Gubeljak e , R. Egger b , J. Domitner a, * 8 th International Conference on Structural Integrity and Durability (ICSID2025) Prestudy on the susceptibility of P460QL steel to hydrogen-assisted cracking A. H. Jabbari Mostahsan a , Z. Silvayeh a,d , J. Stippich a , M. Mülleder b , C. Commenda c , C. Schindler b , P. Auer a , T. Hafner d , N. Gubeljak e , R. Egger b , J. Domitner a, *

a Graz University of Technology, Inffeldgasse 11/I, 8010 Graz, Austria b voestalpine Grobblech GmbH, voestalpine-Straße 3, 4020 Linz, Austria c voestalpine Stahl GmbH, voestalpine-Straße 3, 4020 Linz, Austria d HyCentA Research GmbH, Inffeldgasse 15, 8010 Graz, Austria e University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia a Graz University of Technology, Inffeldgasse 11/I, 8010 Graz, Austria b voestalpine Grobblech GmbH, voestalpine-Straße 3, 4020 Linz, Austria c voestalpine Stahl GmbH, voestalpine-Straße 3, 4020 Linz, Austria d HyCentA Research GmbH, Inffeldgasse 15, 8010 Graz, Austria e University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia

© 2026 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ICSID organizers Abstract The susceptibility of P460QL micro-alloyed steel to hydrogen-assisted cracking (HAC) was studied under constant gas charging conditions. Specimens for microstructure analysis and 13 mm-thick compact tension (CT) specimens for fracture mechanics tests were wire-cut from a hot-rolled and tempered steel plate. The microstructure was analyzed using light optical microscopy (LOM) and scanning electron microscopy (SEM) with electron backscatter diffraction (EBSD). The CT specimens were pre-cracked by cyclic tensile loading, and each specimen was loaded according to the constant displacement method by using a wedge. The actual stress intensity factor at the crack tip was calculated based on experiments and finite element analysis (FEA). The wedge-loaded CT specimens were stored for 1000 hours inside an autoclave filled with pure hydrogen gas at the pressure of 200 bar at room temperature. As HAC did not occur at the stress intensity factor of 67 MPam 0.5 , the P460QL micro-alloyed steel with the thickness of < ½ inch (< 13 mm) can be considered as suitable for applications under the conditions investigated. © 2026 The Authors. Copy from the contract: Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ICSID organizers Keywords: Hydrogen-assisted cracking (HAC); P460QL steel; Wedge-loaded specimen; Finite element analysis (FEA) Abstract The susceptibility of P460QL micro-alloyed steel to hydrogen-assisted cracking (HAC) was studied under constant gas charging conditions. Specimens for microstructure analysis and 13 mm-thick compact tension (CT) specimens for fracture mechanics tests were wire-cut from a hot-rolled and tempered steel plate. The microstructure was analyzed using light optical microscopy (LOM) and scanning electron microscopy (SEM) with electron backscatter diffraction (EBSD). The CT specimens were pre-cracked by cyclic tensile loading, and each specimen was loaded according to the constant displacement method by using a wedge. The actual stress intensity factor at the crack tip was calculated based on experiments and finite element analysis (FEA). The wedge-loaded CT specimens were stored for 1000 hours inside an autoclave filled with pure hydrogen gas at the pressure of 200 bar at room temperature. As HAC did not occur at the stress intensity factor of 67 MPam 0.5 , the P460QL micro-alloyed steel with the thickness of < ½ inch (< 13 mm) can be considered as suitable for applications under the conditions investigated. © 2026 The Authors. Copy from the contract: Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ICSID organizers Keywords: Hydrogen-assisted cracking (HAC); P460QL steel; Wedge-loaded specimen; Finite element analysis (FEA)

* Corresponding author. Tel.: +43-316-873-9440 E-mail address: josef.domitner@tugraz.at * Corresponding author. Tel.: +43-316-873-9440 E-mail address: josef.domitner@tugraz.at

2452-3216 © 2026 The Authors. Copy from the contract: Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ICSID organizers 2452-3216 © 2026 The Authors. Copy from the contract: Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ICSID organizers

2452-3216 © 2026 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ICSID organizers 10.1016/j.prostr.2026.04.026