The influence of steelmaking practice on the fatigue crack propagation behavior of A533B low alloy plate steels is examined. Conventional practice, calcium-treated and electroslag-remelted steels were investigated in 6 specimen orientations. A significant improvement in the isotropy of fatigue crack growth rates and a consistent overall improvement in fatigue crack growth rate were found in going from the conventional practice, to the calcium-treated, to the electroslag-remelted materials. The fatigue crack growth rate differences within a material and between materials were attributed to material differences in nonmetallic inclusion quantities and morphologies.

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