The fatigue strength of parent material is affected by various factors such as yield strength, surface roughness, the quality of critical edges, and notches. To ensure sufficient fatigue strength, it is important to consider the yield strength of the parent material and the surface roughness of the plate. The quality of critical edges and notches, such as holes for bolts or rivets, should also be carefully evaluated. SSAB Design Handbook provides guidance on how to select appropriate material in various applications under fatigue load.