A non-austempered spheroidal graphite cast iron obtained without austempering, and having a tensile strength of 650 to 850 MPa and an elongation of 7.0 to 14.5%, wherein a fatigue limit of its V-notched material is at least 290 MPa, the spheroidal graphite cast iron having well-balanced mechanical properties of a tensile strength and elongation and being highly strong and tenacious with improved tensile strength and elongation.
