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A weakest–link model has been developed to assess the fatigue limit of three different strip steels. The analysis is based on a discretization of a component into FEM elements whose failure is correlated to the presence of internal inclusions inside the steel. The analysis of the inclusions content is carried out by means of the Statistics of Extremes: the three strips are then compared in terms of cleanliness and fatigue properties. For each steel fatigue limit distribution is obtained with a weakest-link model of the fatigue specimens: the obtained results are close to experimental outcomes.