Applying a shot-peening surface treatment technique of metallic IC used in SOFCs, consists of utilizing shot beads to impact the surface of the metallic IC at some velocity. The shot-peening surface treatment technique changes surface characteristics of metallic ICs to achieve a reliable oxide scale on the metallic ICs. This technique creates a novel mechanism of improvement of the reliability of the metallic ICs for long-term performance at high SOFC operating temperatures. It creates a waving surface of the metallic ICs and prevents/delay the delamination/spallation of the oxide scale.