Abstract
The objective of the present work has been to study the fracture properties of the interface between clad and base material of two 316L austenitic stainless steel - X60/X65 carbon steel hot roll bonded clad pipes; with and without a Ni-interlayer and before and after welding. Fracture mechanical tests were performed in air and under in situ electrochemical hydrogen charging to establish the fracture toughness for both systems. The results revealed that an electroplated Ni interlayer is clearly preferable in clad steel with respect to avoiding influence of hydrogen on fracture toughness of the clad/pipe interface, both in not welded and welded condition.