Suitability of 17-4 PH Stainless Steel Gas Components

The transition from natural gas to hydrogen introduces new material challenges within the context of the GB gas network. One critical concern is hydrogen embrittlement, particularly in 17-4 Precipitation Hardened (PH) Stainless Steel, commonly used in axial flow regulators and other key gas network components like valve stems. Hydrogen embrittlement can significantly reduce ductility, fatigue life, and fracture toughness, potentially leading to component failure. While research exists, much of it focuses on extreme conditions (e.g., high pressures and rapid temperature cycling) that do not reflect typical operational environments in the GB gas network.