Eddy current method was applied to evaluate the mechanical properties of thin wall ductile cast iron. Thin wall ductile cast iron specimens with the thickness of 4mm and 6mm were prepared. Eddy current signal and Rockwell hardness were measured at the same position of the specimen. Correlation of the signal intensity and hardness of the thin wall specimen was compared with that of thick Y-Block. Hardness of the thin wall specimen was higher than that of Y-block specimen for the same eddy current signal intensity. Change in the eddy current signal with hardness of the thin wall specimen was smaller than that of the Y-block specimen. Tensile strength of the thin wall cast iron specimen can be estimated with the correlation of hardness and tensile strength for thick cast iron. Correlation of eddy current and hardness is needed to be clarified to eavluate mechanical properties of thin wall ductile cast iron by the eddy current method.
